getpid() is a pid of a process, at least tid must be provided.
But if zero is passed, then calling thread will be used.
That exactly what is needed.
Signed-off-by: Roman Pen <r.peniaev@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: <linux-btrace@xxxxxxxxxxxxxxx>
---
btreplay/btreplay.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/btreplay/btreplay.c b/btreplay/btreplay.c
index 2a1525e..5bf47ff 100644
--- a/btreplay/btreplay.c
+++ b/btreplay/btreplay.c
@@ -513,7 +513,7 @@ realloc:
size = CPU_ALLOC_SIZE(nrcpus);
CPU_ZERO_S(size, cpus);
- if (sched_getaffinity(getpid(), size, cpus)) {
+ if (sched_getaffinity(0, size, cpus)) {
if( errno == EINVAL && nrcpus < (4096<<4) ) {
CPU_FREE(cpus);
nrcpus <<= 1;
@@ -552,16 +552,17 @@ static void pin_to_cpu(struct thr_info *tip)
CPU_ZERO_S(size, cpus);
CPU_SET_S(tip->cpu, size, cpus);
- if (sched_setaffinity(getpid(), size, cpus)) {
+ if (sched_setaffinity(0, size, cpus)) {
fatal("sched_setaffinity", ERR_SYSCALL, "Failed to pin CPU\n");
/*NOTREACHED*/
}
+ assert(tip->cpu == sched_getcpu());
if (verbose > 1) {
int i;
cpu_set_t *now = CPU_ALLOC(ncpus);
- (void)sched_getaffinity(getpid(), size, now);
+ (void)sched_getaffinity(0, size, now);
fprintf(tip->vfp, "Pinned to CPU %02d ", tip->cpu);
for (i = 0; i < ncpus; i++)
fprintf(tip->vfp, "%1d", CPU_ISSET_S(i, size, now));
--
2.7.4
--
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