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scx_central: fix sched_setaffinity() call with the set size. #3020

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scx_central: fix sched_setaffinity() call with the set size. #3020

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6 changes: 4 additions & 2 deletions scheds/c/scx_central.c
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ int main(int argc, char **argv)
__u64 seq = 0, ecode;
__s32 opt;
cpu_set_t *cpuset;
size_t cpuset_size;

libbpf_set_print(libbpf_print_fn);
signal(SIGINT, sigint_handler);
Expand Down Expand Up @@ -116,9 +117,10 @@ int main(int argc, char **argv)
*/
cpuset = CPU_ALLOC(skel->rodata->nr_cpu_ids);
SCX_BUG_ON(!cpuset, "Failed to allocate cpuset");
CPU_ZERO_S(CPU_ALLOC_SIZE(skel->rodata->nr_cpu_ids), cpuset);
cpuset_size = CPU_ALLOC_SIZE(skel->rodata->nr_cpu_ids);
CPU_ZERO_S(cpuset_size, cpuset);
CPU_SET(skel->rodata->central_cpu, cpuset);
SCX_BUG_ON(sched_setaffinity(0, sizeof(*cpuset), cpuset),
SCX_BUG_ON(sched_setaffinity(0, cpuset_size, cpuset),
"Failed to affinitize to central CPU %d (max %d)",
skel->rodata->central_cpu, skel->rodata->nr_cpu_ids - 1);
CPU_FREE(cpuset);
Expand Down
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