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selftests/mm: don't fail uffd-stress if too many CPUs

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This calculation divides a fixed parameter by an environment-dependent
parameter i.e.  the number of CPUs.

The simple way to avoid machine-specific failures here is to just put a
cap on the max value of the latter.

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-6-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Suggested-by: Mateusz Guzik <mjguzik@gmail.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Brendan Jackman
2025-03-11 13:18:17 +00:00
committed by Andrew Morton
parent db0f1c138f
commit bf6d575e24
1 changed files with 10 additions and 1 deletions
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tools/testing/selftests/mm/uffd-stress.c
+10 -1
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@@ -435,6 +435,7 @@ static void sigalrm(int sig)
int main(int argc, char **argv)
{
unsigned long nr_cpus;
size_t bytes;
if (argc < 4)
@@ -453,7 +454,15 @@ int main(int argc, char **argv)
return KSFT_SKIP;
}
nr_parallel = sysconf(_SC_NPROCESSORS_ONLN);
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (nr_cpus > 32) {
/* Don't let calculation below go to zero. */
ksft_print_msg("_SC_NPROCESSORS_ONLN (%lu) too large, capping nr_threads to 32\n",
nr_cpus);
nr_parallel = 32;
} else {
nr_parallel = nr_cpus;
}
nr_pages_per_cpu = bytes / page_size / nr_parallel;
if (!nr_pages_per_cpu) {