Message ID | gerrit.1573465782000.Ic6ec48f75f3a0576d3121befd04531382c92afb4@gnutoolchain-gerrit.osci.io |
---|---|
State | New |
Headers | show |
Series | [review] linux: Add comment on affinity set sizes to tst-skeleton-affinity.c | expand |
Szabolcs Nagy has posted comments on this change. Change URL: https://gnutoolchain-gerrit.osci.io/r/c/glibc/+/610 ...................................................................... Patch Set 2: Code-Review+2
diff --git a/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c b/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c index 32fb94c..9d1f27f 100644 --- a/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c +++ b/sysdeps/unix/sysv/linux/tst-skeleton-affinity.c @@ -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)