[v2,07/15] linux: Add process_mrelease
Checks
| Context |
Check |
Description |
| dj/TryBot-apply_patch |
success
|
Patch applied to master at the time it was sent
|
Commit Message
It was added on Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1)
to allow release the memory of a dying process from the context of the
caller.
---
NEWS | 3 +
sysdeps/unix/sysv/linux/Makefile | 1 +
sysdeps/unix/sysv/linux/Versions | 1 +
sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
sysdeps/unix/sysv/linux/bits/mman_ext.h | 2 +
sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
.../sysv/linux/m68k/coldfire/libc.abilist | 1 +
.../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
.../sysv/linux/microblaze/be/libc.abilist | 1 +
.../sysv/linux/microblaze/le/libc.abilist | 1 +
.../sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
.../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
.../sysv/linux/mips/mips64/n32/libc.abilist | 1 +
.../sysv/linux/mips/mips64/n64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
sysdeps/unix/sysv/linux/or1k/libc.abilist | 1 +
.../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
.../powerpc/powerpc32/nofpu/libc.abilist | 1 +
.../linux/powerpc/powerpc64/be/libc.abilist | 1 +
.../linux/powerpc/powerpc64/le/libc.abilist | 1 +
.../unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
.../unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
.../sysv/linux/sparc/sparc32/libc.abilist | 1 +
.../sysv/linux/sparc/sparc64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/syscalls.list | 1 +
.../unix/sysv/linux/tst-process_mrelease.c | 72 +++++++++++++++++++
.../unix/sysv/linux/x86_64/64/libc.abilist | 1 +
.../unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
39 files changed, 113 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/tst-process_mrelease.c
Comments
On 2/7/22 12:44, Adhemerval Zanella via Libc-alpha wrote:
> It was added on Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1)
> to allow release the memory of a dying process from the context of the
> caller.
As requested for patch 6, if you can split 6 and 7 out we can review them as a set.
Suggest:
Added in Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1), the new syscalls
allows a caller to free the memory of a dying target process.
> ---
> NEWS | 3 +
> sysdeps/unix/sysv/linux/Makefile | 1 +
> sysdeps/unix/sysv/linux/Versions | 1 +
> sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/bits/mman_ext.h | 2 +
> sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
> .../sysv/linux/m68k/coldfire/libc.abilist | 1 +
> .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
> .../sysv/linux/microblaze/be/libc.abilist | 1 +
> .../sysv/linux/microblaze/le/libc.abilist | 1 +
> .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
> .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
> .../sysv/linux/mips/mips64/n32/libc.abilist | 1 +
> .../sysv/linux/mips/mips64/n64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/or1k/libc.abilist | 1 +
> .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
> .../powerpc/powerpc32/nofpu/libc.abilist | 1 +
> .../linux/powerpc/powerpc64/be/libc.abilist | 1 +
> .../linux/powerpc/powerpc64/le/libc.abilist | 1 +
> .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
> .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
> .../sysv/linux/sparc/sparc32/libc.abilist | 1 +
> .../sysv/linux/sparc/sparc64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/syscalls.list | 1 +
> .../unix/sysv/linux/tst-process_mrelease.c | 72 +++++++++++++++++++
> .../unix/sysv/linux/x86_64/64/libc.abilist | 1 +
> .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
> 39 files changed, 113 insertions(+)
> create mode 100644 sysdeps/unix/sysv/linux/tst-process_mrelease.c
>
> diff --git a/NEWS b/NEWS
> index 47cab5d5c1..7893643f83 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -16,6 +16,9 @@ Major new features:
> * On Linux, the process_madvise has been added. It is has the same
> functionality as madvise but using a pidfd of the target process.
>
> +* On Linux, the process_mrelease has been added. It allows release the
> + memory of a dying process from the context of the caller.
Suggest:
...
It allows a caller to release the memory of a dying process. The release of the memory
is carried out in the context of the caller, using the caller's CPU affinity, and
priority with CPU usage accounted to the caller.
> +
> Deprecated and removed features, and other changes affecting compatibility:
>
> [Add deprecations, removals and changes affecting compatibility here]
> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
> index 2c7c425ab7..a4faa4a415 100644
> --- a/sysdeps/unix/sysv/linux/Makefile
> +++ b/sysdeps/unix/sysv/linux/Makefile
> @@ -128,6 +128,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
> tst-scm_rights \
> tst-epoll \
> tst-pidfd \
> + tst-process_mrelease \
OK.
> # tests
>
> # process_madvise requires CAP_SYS_ADMIN.
> diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
> index c13a3c4fe7..66a995d3dc 100644
> --- a/sysdeps/unix/sysv/linux/Versions
> +++ b/sysdeps/unix/sysv/linux/Versions
> @@ -304,6 +304,7 @@ libc {
> pidfd_getfd;
> pidfd_send_signal;
> process_madvise;
> + process_mrelease;
OK.
> }
> GLIBC_PRIVATE {
> # functions used in other libraries
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 4d8e64ce04..027a1cf531 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2620,3 +2620,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index 36f3129257..703fcf5deb 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2717,6 +2717,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
> index 2a1e346d4b..28c52dcbac 100644
> --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
> @@ -2381,3 +2381,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> index 25de8a018c..c3adade814 100644
> --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> @@ -500,6 +500,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> index e9cf9b1593..33a90a248e 100644
> --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> @@ -497,6 +497,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/bits/mman_ext.h b/sysdeps/unix/sysv/linux/bits/mman_ext.h
> index 20960e7df5..97234a7adf 100644
> --- a/sysdeps/unix/sysv/linux/bits/mman_ext.h
> +++ b/sysdeps/unix/sysv/linux/bits/mman_ext.h
> @@ -30,4 +30,6 @@ extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
> unsigned __flags)
> __THROW;
>
> +extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
OK.
> +
> #endif /* __USE_GNU */
> diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> index 66c2f28c43..23a00cfc0b 100644
> --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> @@ -2656,3 +2656,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index 527880dc06..93e1068208 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -2605,6 +2605,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 1497b8a2c3..356b05cae4 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2789,6 +2789,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index abe351d0b4..58e51aae4b 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -2555,6 +2555,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index 130f7a6b04..ea4a19cbc2 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -501,6 +501,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0x98
> GLIBC_2.4 _IO_2_1_stdin_ D 0x98
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index cf59edb383..217717859c 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -2732,6 +2732,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> index f1b927d63d..0e373d5c89 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> @@ -2705,3 +2705,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> index 9bb7c76f94..569d3e5556 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> @@ -2702,3 +2702,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index 03e7820eea..7ccc7f93eb 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -2697,6 +2697,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index 3d70dc1140..d197f0bd5d 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -2695,6 +2695,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index 5498e2ee30..4a8e857e53 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -2703,6 +2703,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index dbebed5d36..e0a170c030 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -2606,6 +2606,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index a0bfa86068..6f809245c9 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2744,3 +2744,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist
> index 7d09a03d0e..1fc9e27c27 100644
> --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist
> @@ -2127,3 +2127,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index db8fc28e75..01ba1dd9ec 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -2759,6 +2759,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index e6cbb83b26..263231a396 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -2792,6 +2792,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> index 162241fc68..2c3c3af8fb 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> @@ -2514,6 +2514,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> index 2845ee2015..4138874b38 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> @@ -2816,3 +2816,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> index 277f6fbe95..5feae3245f 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> @@ -2383,3 +2383,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> index 6f2a4d4504..3e6a4ae5ec 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> @@ -2583,3 +2583,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index bfb317488d..93c7b79b51 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -2757,6 +2757,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index beef516979..b663fabeba 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -2551,6 +2551,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> index c326c9320a..abebf77944 100644
> --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> @@ -2612,6 +2612,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> index 704f489a8e..afd8a42895 100644
> --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> @@ -2609,6 +2609,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index b9e8a34153..56feda817d 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -2752,6 +2752,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index e921a8dd76..00cc5b24d1 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -2578,6 +2578,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
> index 6942a16d0c..289a2c820a 100644
> --- a/sysdeps/unix/sysv/linux/syscalls.list
> +++ b/sysdeps/unix/sysv/linux/syscalls.list
> @@ -44,6 +44,7 @@ pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd
> pivot_root EXTRA pivot_root i:ss pivot_root
> pidfd_send_signal EXTRA pidfd_send_signal i:iiPU pidfd_send_signal
> process_madvise EXTRA process_madvise i:iPiiU process_madvise
> +process_mrelease EXTRA process_mrelease i:iU process_mrelease
OK.
> query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
> quotactl EXTRA quotactl i:isip quotactl
> remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
> diff --git a/sysdeps/unix/sysv/linux/tst-process_mrelease.c b/sysdeps/unix/sysv/linux/tst-process_mrelease.c
> new file mode 100644
> index 0000000000..eadb7fc73b
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tst-process_mrelease.c
> @@ -0,0 +1,72 @@
> +/* Basic tests for Linux process_mrelease.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <errno.h>
> +#include <support/check.h>
> +#include <support/xunistd.h>
> +#include <support/xsocket.h>
> +#include <sys/pidfd.h>
> +#include <sys/mman.h>
> +#include <sys/wait.h>
> +
> +static void
> +subprocess (void)
> +{
> + pause ();
> + _exit (0);
> +}
> +
> +static int
> +do_test (void)
> +{
> + {
> + int r = process_mrelease (-1, 0);
> + TEST_COMPARE (r, -1);
> + if (errno == ENOSYS)
> + FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
> + "skipping test");
> + TEST_COMPARE (errno, EBADF);
> + }
> +
> + pid_t pid = xfork ();
> + if (pid == 0)
> + subprocess ();
> +
May we please tes process_mrelease returns EBADF for an invalid pidfd?
> + int pidfd = pidfd_open (pid, 0);
> + TEST_VERIFY (pidfd != -1);
> +
> + /* The syscall only succeedes if the target process is exiting and there
> + is no guarantee that calling if after pidfd_send_signal will not error
> + (since the process might already been reaped by OS). So just check if
Suggest:
(since the process might have already been reaped by the OS).
> + it does fail when the process is stll running. */
> + TEST_COMPARE (process_mrelease (pidfd, 0), -1);
> + TEST_COMPARE (errno, EINVAL);
OK.
> +
> + TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
> + {
> + siginfo_t info;
> + int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
> + TEST_COMPARE (r, 0);
> + TEST_COMPARE (info.si_status, SIGKILL);
> + TEST_COMPARE (info.si_code, CLD_KILLED);
> + }
May we please test process_mrelease returns ESRCH for the now dead pidfd target?
That covers the life-cycle parts of the API we can test.
> +
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index 8948dc2705..4e729bdf56 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -2529,6 +2529,7 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index 0988804f24..b5d7b9f1ed 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2635,3 +2635,4 @@ GLIBC_2.36 pidfd_getfd F
> GLIBC_2.36 pidfd_open F
> GLIBC_2.36 pidfd_send_signal F
> GLIBC_2.36 process_madvise F
> +GLIBC_2.36 process_mrelease F
On 31/05/2022 19:12, Carlos O'Donell wrote:
> On 2/7/22 12:44, Adhemerval Zanella via Libc-alpha wrote:
>> It was added on Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1)
>> to allow release the memory of a dying process from the context of the
>> caller.
>
> As requested for patch 6, if you can split 6 and 7 out we can review them as a set.
>
> Suggest:
>
> Added in Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1), the new syscalls
> allows a caller to free the memory of a dying target process.
Ack.
>
>> ---
>> NEWS | 3 +
>> sysdeps/unix/sysv/linux/Makefile | 1 +
>> sysdeps/unix/sysv/linux/Versions | 1 +
>> sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/bits/mman_ext.h | 2 +
>> sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
>> .../sysv/linux/m68k/coldfire/libc.abilist | 1 +
>> .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
>> .../sysv/linux/microblaze/be/libc.abilist | 1 +
>> .../sysv/linux/microblaze/le/libc.abilist | 1 +
>> .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
>> .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
>> .../sysv/linux/mips/mips64/n32/libc.abilist | 1 +
>> .../sysv/linux/mips/mips64/n64/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/or1k/libc.abilist | 1 +
>> .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
>> .../powerpc/powerpc32/nofpu/libc.abilist | 1 +
>> .../linux/powerpc/powerpc64/be/libc.abilist | 1 +
>> .../linux/powerpc/powerpc64/le/libc.abilist | 1 +
>> .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
>> .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
>> .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
>> .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
>> .../sysv/linux/sparc/sparc32/libc.abilist | 1 +
>> .../sysv/linux/sparc/sparc64/libc.abilist | 1 +
>> sysdeps/unix/sysv/linux/syscalls.list | 1 +
>> .../unix/sysv/linux/tst-process_mrelease.c | 72 +++++++++++++++++++
>> .../unix/sysv/linux/x86_64/64/libc.abilist | 1 +
>> .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
>> 39 files changed, 113 insertions(+)
>> create mode 100644 sysdeps/unix/sysv/linux/tst-process_mrelease.c
>>
>> diff --git a/NEWS b/NEWS
>> index 47cab5d5c1..7893643f83 100644
>> --- a/NEWS
>> +++ b/NEWS
>> @@ -16,6 +16,9 @@ Major new features:
>> * On Linux, the process_madvise has been added. It is has the same
>> functionality as madvise but using a pidfd of the target process.
>>
>> +* On Linux, the process_mrelease has been added. It allows release the
>> + memory of a dying process from the context of the caller.
>
> Suggest:
>
> ...
> It allows a caller to release the memory of a dying process. The release of the memory
> is carried out in the context of the caller, using the caller's CPU affinity, and
> priority with CPU usage accounted to the caller.
>
Ack.
>
>> +
>> Deprecated and removed features, and other changes affecting compatibility:
>>
>> [Add deprecations, removals and changes affecting compatibility here]
>> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
>> index 2c7c425ab7..a4faa4a415 100644
>> --- a/sysdeps/unix/sysv/linux/Makefile
>> +++ b/sysdeps/unix/sysv/linux/Makefile
>> @@ -128,6 +128,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
>> tst-scm_rights \
>> tst-epoll \
>> tst-pidfd \
>> + tst-process_mrelease \
>
> OK.
>
>> # tests
>>
>> # process_madvise requires CAP_SYS_ADMIN.
>> diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
>> index c13a3c4fe7..66a995d3dc 100644
>> --- a/sysdeps/unix/sysv/linux/Versions
>> +++ b/sysdeps/unix/sysv/linux/Versions
>> @@ -304,6 +304,7 @@ libc {
>> pidfd_getfd;
>> pidfd_send_signal;
>> process_madvise;
>> + process_mrelease;
>
> OK.
>
>> }
>> GLIBC_PRIVATE {
>> # functions used in other libraries
>> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>> index 4d8e64ce04..027a1cf531 100644
>> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
>> @@ -2620,3 +2620,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
>> index 36f3129257..703fcf5deb 100644
>> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
>> @@ -2717,6 +2717,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
>> index 2a1e346d4b..28c52dcbac 100644
>> --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
>> @@ -2381,3 +2381,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
>> index 25de8a018c..c3adade814 100644
>> --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
>> @@ -500,6 +500,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _Exit F
>> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
>> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
>> diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
>> index e9cf9b1593..33a90a248e 100644
>> --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
>> @@ -497,6 +497,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _Exit F
>> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
>> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
>> diff --git a/sysdeps/unix/sysv/linux/bits/mman_ext.h b/sysdeps/unix/sysv/linux/bits/mman_ext.h
>> index 20960e7df5..97234a7adf 100644
>> --- a/sysdeps/unix/sysv/linux/bits/mman_ext.h
>> +++ b/sysdeps/unix/sysv/linux/bits/mman_ext.h
>> @@ -30,4 +30,6 @@ extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
>> unsigned __flags)
>> __THROW;
>>
>> +extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
>
> OK.
>
>> +
>> #endif /* __USE_GNU */
>> diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
>> index 66c2f28c43..23a00cfc0b 100644
>> --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
>> @@ -2656,3 +2656,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> index 527880dc06..93e1068208 100644
>> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> @@ -2605,6 +2605,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
>> index 1497b8a2c3..356b05cae4 100644
>> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
>> @@ -2789,6 +2789,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
>> index abe351d0b4..58e51aae4b 100644
>> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
>> @@ -2555,6 +2555,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>> index 130f7a6b04..ea4a19cbc2 100644
>> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
>> @@ -501,6 +501,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _Exit F
>> GLIBC_2.4 _IO_2_1_stderr_ D 0x98
>> GLIBC_2.4 _IO_2_1_stdin_ D 0x98
>> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>> index cf59edb383..217717859c 100644
>> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
>> @@ -2732,6 +2732,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
>> index f1b927d63d..0e373d5c89 100644
>> --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
>> @@ -2705,3 +2705,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
>> index 9bb7c76f94..569d3e5556 100644
>> --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
>> @@ -2702,3 +2702,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>> index 03e7820eea..7ccc7f93eb 100644
>> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
>> @@ -2697,6 +2697,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>> index 3d70dc1140..d197f0bd5d 100644
>> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
>> @@ -2695,6 +2695,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>> index 5498e2ee30..4a8e857e53 100644
>> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
>> @@ -2703,6 +2703,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>> index dbebed5d36..e0a170c030 100644
>> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
>> @@ -2606,6 +2606,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
>> index a0bfa86068..6f809245c9 100644
>> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
>> @@ -2744,3 +2744,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist
>> index 7d09a03d0e..1fc9e27c27 100644
>> --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist
>> @@ -2127,3 +2127,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>> index db8fc28e75..01ba1dd9ec 100644
>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
>> @@ -2759,6 +2759,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>> index e6cbb83b26..263231a396 100644
>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
>> @@ -2792,6 +2792,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
>> index 162241fc68..2c3c3af8fb 100644
>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
>> @@ -2514,6 +2514,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
>> index 2845ee2015..4138874b38 100644
>> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
>> @@ -2816,3 +2816,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
>> index 277f6fbe95..5feae3245f 100644
>> --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
>> @@ -2383,3 +2383,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
>> index 6f2a4d4504..3e6a4ae5ec 100644
>> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
>> @@ -2583,3 +2583,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>> index bfb317488d..93c7b79b51 100644
>> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
>> @@ -2757,6 +2757,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>> index beef516979..b663fabeba 100644
>> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
>> @@ -2551,6 +2551,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
>> index c326c9320a..abebf77944 100644
>> --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
>> @@ -2612,6 +2612,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
>> index 704f489a8e..afd8a42895 100644
>> --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
>> @@ -2609,6 +2609,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>> index b9e8a34153..56feda817d 100644
>> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
>> @@ -2752,6 +2752,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 _IO_fprintf F
>> GLIBC_2.4 _IO_printf F
>> GLIBC_2.4 _IO_sprintf F
>> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>> index e921a8dd76..00cc5b24d1 100644
>> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
>> @@ -2578,6 +2578,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
>> index 6942a16d0c..289a2c820a 100644
>> --- a/sysdeps/unix/sysv/linux/syscalls.list
>> +++ b/sysdeps/unix/sysv/linux/syscalls.list
>> @@ -44,6 +44,7 @@ pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd
>> pivot_root EXTRA pivot_root i:ss pivot_root
>> pidfd_send_signal EXTRA pidfd_send_signal i:iiPU pidfd_send_signal
>> process_madvise EXTRA process_madvise i:iPiiU process_madvise
>> +process_mrelease EXTRA process_mrelease i:iU process_mrelease
>
> OK.
>
>> query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
>> quotactl EXTRA quotactl i:isip quotactl
>> remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
>> diff --git a/sysdeps/unix/sysv/linux/tst-process_mrelease.c b/sysdeps/unix/sysv/linux/tst-process_mrelease.c
>> new file mode 100644
>> index 0000000000..eadb7fc73b
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/tst-process_mrelease.c
>> @@ -0,0 +1,72 @@
>> +/* Basic tests for Linux process_mrelease.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <errno.h>
>> +#include <support/check.h>
>> +#include <support/xunistd.h>
>> +#include <support/xsocket.h>
>> +#include <sys/pidfd.h>
>> +#include <sys/mman.h>
>> +#include <sys/wait.h>
>> +
>> +static void
>> +subprocess (void)
>> +{
>> + pause ();
>> + _exit (0);
>> +}
>> +
>> +static int
>> +do_test (void)
>> +{
>> + {
>> + int r = process_mrelease (-1, 0);
>> + TEST_COMPARE (r, -1);
>> + if (errno == ENOSYS)
>> + FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
>> + "skipping test");
>> + TEST_COMPARE (errno, EBADF);
>> + }
>> +
>> + pid_t pid = xfork ();
>> + if (pid == 0)
>> + subprocess ();
>> +
>
> May we please tes process_mrelease returns EBADF for an invalid pidfd?
It already does, at line 43 after the ENOSYS check.
>
>> + int pidfd = pidfd_open (pid, 0);
>> + TEST_VERIFY (pidfd != -1);
>> +
>> + /* The syscall only succeedes if the target process is exiting and there
>> + is no guarantee that calling if after pidfd_send_signal will not error
>> + (since the process might already been reaped by OS). So just check if
>
> Suggest:
> (since the process might have already been reaped by the OS).
>
Ack.
>> + it does fail when the process is stll running. */
>> + TEST_COMPARE (process_mrelease (pidfd, 0), -1);
>> + TEST_COMPARE (errno, EINVAL);
>
> OK.
>
>> +
>> + TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
>> + {
>> + siginfo_t info;
>> + int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
>> + TEST_COMPARE (r, 0);
>> + TEST_COMPARE (info.si_status, SIGKILL);
>> + TEST_COMPARE (info.si_code, CLD_KILLED);
>> + }
>
> May we please test process_mrelease returns ESRCH for the now dead pidfd target?
Ok, I will add a check for it.
>
> That covers the life-cycle parts of the API we can test.
>
>> +
>> + return 0;
>> +}
>> +
>> +#include <support/test-driver.c>
>> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>> index 8948dc2705..4e729bdf56 100644
>> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
>> @@ -2529,6 +2529,7 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>> GLIBC_2.4 __confstr_chk F
>> GLIBC_2.4 __fgets_chk F
>> GLIBC_2.4 __fgets_unlocked_chk F
>> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>> index 0988804f24..b5d7b9f1ed 100644
>> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
>> @@ -2635,3 +2635,4 @@ GLIBC_2.36 pidfd_getfd F
>> GLIBC_2.36 pidfd_open F
>> GLIBC_2.36 pidfd_send_signal F
>> GLIBC_2.36 process_madvise F
>> +GLIBC_2.36 process_mrelease F
>
>
@@ -16,6 +16,9 @@ Major new features:
* On Linux, the process_madvise has been added. It is has the same
functionality as madvise but using a pidfd of the target process.
+* On Linux, the process_mrelease has been added. It allows release the
+ memory of a dying process from the context of the caller.
+
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]
@@ -128,6 +128,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-scm_rights \
tst-epoll \
tst-pidfd \
+ tst-process_mrelease \
# tests
# process_madvise requires CAP_SYS_ADMIN.
@@ -304,6 +304,7 @@ libc {
pidfd_getfd;
pidfd_send_signal;
process_madvise;
+ process_mrelease;
}
GLIBC_PRIVATE {
# functions used in other libraries
@@ -2620,3 +2620,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2717,6 +2717,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2381,3 +2381,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -500,6 +500,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -497,6 +497,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -30,4 +30,6 @@ extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
unsigned __flags)
__THROW;
+extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
+
#endif /* __USE_GNU */
@@ -2656,3 +2656,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2605,6 +2605,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2789,6 +2789,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2555,6 +2555,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -501,6 +501,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0x98
GLIBC_2.4 _IO_2_1_stdin_ D 0x98
@@ -2732,6 +2732,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2705,3 +2705,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2702,3 +2702,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2697,6 +2697,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2695,6 +2695,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2703,6 +2703,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2606,6 +2606,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2744,3 +2744,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2127,3 +2127,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2759,6 +2759,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2792,6 +2792,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2514,6 +2514,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2816,3 +2816,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2383,3 +2383,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2583,3 +2583,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2757,6 +2757,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2551,6 +2551,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2612,6 +2612,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2609,6 +2609,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2752,6 +2752,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2578,6 +2578,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -44,6 +44,7 @@ pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd
pivot_root EXTRA pivot_root i:ss pivot_root
pidfd_send_signal EXTRA pidfd_send_signal i:iiPU pidfd_send_signal
process_madvise EXTRA process_madvise i:iPiiU process_madvise
+process_mrelease EXTRA process_mrelease i:iU process_mrelease
query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
quotactl EXTRA quotactl i:isip quotactl
remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
new file mode 100644
@@ -0,0 +1,72 @@
+/* Basic tests for Linux process_mrelease.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <support/xsocket.h>
+#include <sys/pidfd.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+
+static void
+subprocess (void)
+{
+ pause ();
+ _exit (0);
+}
+
+static int
+do_test (void)
+{
+ {
+ int r = process_mrelease (-1, 0);
+ TEST_COMPARE (r, -1);
+ if (errno == ENOSYS)
+ FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
+ "skipping test");
+ TEST_COMPARE (errno, EBADF);
+ }
+
+ pid_t pid = xfork ();
+ if (pid == 0)
+ subprocess ();
+
+ int pidfd = pidfd_open (pid, 0);
+ TEST_VERIFY (pidfd != -1);
+
+ /* The syscall only succeedes if the target process is exiting and there
+ is no guarantee that calling if after pidfd_send_signal will not error
+ (since the process might already been reaped by OS). So just check if
+ it does fail when the process is stll running. */
+ TEST_COMPARE (process_mrelease (pidfd, 0), -1);
+ TEST_COMPARE (errno, EINVAL);
+
+ TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
+ {
+ siginfo_t info;
+ int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
+ TEST_COMPARE (r, 0);
+ TEST_COMPARE (info.si_status, SIGKILL);
+ TEST_COMPARE (info.si_code, CLD_KILLED);
+ }
+
+ return 0;
+}
+
+#include <support/test-driver.c>
@@ -2529,6 +2529,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2635,3 +2635,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F