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tests: Verify inheritance of cpu affinity

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Add a couple of tests to verify that CPU affinity set using
sched_setaffinity and pthread_setaffinity_np are inherited by a child
process and child thread.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Siddhesh Poyarekar
2024-12-16 08:14:09 -05:00
parent 82688ca310
commit e41aabcc93
5 changed files with 296 additions and 0 deletions
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71
sysdeps/unix/sysv/linux/tst-sched-affinity-inheritance.c Normal file
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/* CPU Affinity inheritance test - sched_{gs}etaffinity.
Copyright The GNU Toolchain Authors.
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/>. */
/* See top level comment in nptl/tst-skeleton-affinity-inheritance.c for a
description of this test. */
#include <sched.h>
#include <string.h>
#include <stdio.h>
#include <support/check.h>
static void
set_my_affinity (size_t size, const cpu_set_t *set)
{
int ret = sched_setaffinity (0, size, set);
if (ret != 0)
FAIL ("sched_setaffinity returned %d (%s)", ret, strerror (ret));
}
static void
verify_my_affinity (int nproc, size_t size, const cpu_set_t *expected_set)
{
cpu_set_t *set = CPU_ALLOC (nproc);
cpu_set_t *xor_set = CPU_ALLOC (nproc);
if (set == NULL || xor_set== NULL)
FAIL_EXIT1 ("verify_my_affinity: Failed to allocate cpuset: %m\n");
int ret = sched_getaffinity (0, size, set);
if (ret != 0)
FAIL ("sched_getaffinity returned %d (%s)", ret, strerror (ret));
CPU_XOR_S (size, xor_set, expected_set, set);
int cpucount = CPU_COUNT_S (size, xor_set);
if (cpucount > 0)
{
FAIL ("Affinity mask not inherited, "
"following %d CPUs mismatched in the expected and actual sets:\n",
cpucount);
for (int cur = 0; cur < nproc && cpucount >= 0; cur++)
if (CPU_ISSET_S (size, cur, xor_set))
{
printf ("%d ", cur);
cpucount--;
}
printf ("\n");
}
CPU_FREE (set);
CPU_FREE (xor_set);
}
#include <nptl/tst-skeleton-affinity-inheritance.c>