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selftests/powerpc: Fix CPU affinity for child process

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[ Upstream commit 854eb5022be04f81e318765f089f41a57c8e5d83 ]

On systems with large number of cpus, test fails trying to set
affinity by calling sched_setaffinity() with smaller size for affinity
mask. This patch fixes it by making sure that the size of allocated
affinity mask is dependent on the number of CPUs as reported by
get_nprocs().

Fixes: 00b7ec5c9cf3 ("selftests/powerpc: Import Anton's context_switch2 benchmark")
Reported-by: Shirisha Ganta <shiganta@in.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Harish <harish@linux.ibm.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reviewed-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200609081423.529664-1-harish@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harish 2020-06-09 13:44:23 +05:30 committed by Greg Kroah-Hartman
parent fb17074f89
commit c2a8116308
1 changed files with 16 additions and 5 deletions
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21
tools/testing/selftests/powerpc/benchmarks/context_switch.c
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@ -23,6 +23,7 @@
#include <limits.h>
#include <sys/time.h>
#include <sys/syscall.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <linux/futex.h>
@ -108,8 +109,9 @@ static void start_thread_on(void *(*fn)(void *), void *arg, unsigned long cpu)
static void start_process_on(void *(*fn)(void *), void *arg, unsigned long cpu)
{
int pid;
cpu_set_t cpuset;
int pid, ncpus;
cpu_set_t *cpuset;
size_t size;
pid = fork();
if (pid == -1) {
@ -120,14 +122,23 @@ static void start_process_on(void *(*fn)(void *), void *arg, unsigned long cpu)
if (pid)
return;
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
ncpus = get_nprocs();
size = CPU_ALLOC_SIZE(ncpus);
cpuset = CPU_ALLOC(ncpus);
if (!cpuset) {
perror("malloc");
exit(1);
}
CPU_ZERO_S(size, cpuset);
CPU_SET_S(cpu, size, cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset)) {
if (sched_setaffinity(0, size, cpuset)) {
perror("sched_setaffinity");
CPU_FREE(cpuset);
exit(1);
}
CPU_FREE(cpuset);
fn(arg);
exit(0);