[review] linux: Add comment on affinity set sizes to tst-skeleton-affinity.c
Commit Message
Change URL: https://gnutoolchain-gerrit.osci.io/r/c/glibc/+/610
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linux: Add comment on affinity set sizes to tst-skeleton-affinity.c
Change-Id: Ic6ec48f75f3a0576d3121befd04531382c92afb4
---
M sysdeps/unix/sysv/linux/tst-skeleton-affinity.c
1 file changed, 5 insertions(+), 0 deletions(-)
Comments
Szabolcs Nagy has posted comments on this change.
Change URL: https://gnutoolchain-gerrit.osci.io/r/c/glibc/+/610
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Patch Set 2: Code-Review+2
@@ -264,6 +264,11 @@
struct conf conf;
setup_conf (&conf);
+ /* Note: The CPU set size in bits can be less than the CPU count
+ (and the maximum test CPU) because the userspace interface rounds
+ up the bit count, and the rounded-up buffer size is passed into
+ the kernel. The kernel does not know that some of the buffer are
+ actually padding, and writes data there. */
printf ("info: Detected CPU set size (in bits): %d\n", conf.set_size);
printf ("info: Maximum test CPU: %d\n", conf.last_cpu);
if (conf.set_size < 0 || conf.last_cpu < 0)