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| author | Florian Weimer <fweimer@redhat.com> | 2019-11-11 10:49:16 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-11-15 13:05:09 +0100 |
| commit | 9e3e27c4e32c02e93d9779e41356adfb357957e3 (patch) | |
| tree | 588bf4d0732f26f5fc0f2cb5c937dcf94135f177 | |
| parent | e21a7867713c87d0b0698254685d414d811d72b2 (diff) | |
| download | glibc-9e3e27c4e32c02e93d9779e41356adfb357957e3.tar.gz glibc-9e3e27c4e32c02e93d9779e41356adfb357957e3.tar.xz glibc-9e3e27c4e32c02e93d9779e41356adfb357957e3.zip | |
linux: Add comment on affinity set sizes to tst-skeleton-affinity.c
Change-Id: Ic6ec48f75f3a0576d3121befd04531382c92afb4
| -rw-r--r-- | sysdeps/unix/sysv/linux/tst-skeleton-affinity.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c b/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c index 32fb94cdde..9d1f27fea9 100644 --- a/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c +++ b/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c @@ -264,6 +264,11 @@ do_test (void) 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) |