After setting CPU affinity, read it back to verify it was set
correctly. Throw a warning on mismatch. This can happen if affinity
is set to an offline core.
Signed-off-by: Allen Martin <amartin@xxxxxxxxxx>
---
src/cyclictest/cyclictest.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 0912494426ca..568e52f4b328 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -982,7 +982,7 @@ static void *timerthread(void *param)
struct itimerspec tspec;
struct thread_stat *stat = par->stats;
int stopped = 0;
- cpu_set_t mask;
+ cpu_set_t mask, mask_verify;
pthread_t thread;
unsigned long smi_now, smi_old;
@@ -997,6 +997,13 @@ static void *timerthread(void *param)
if (pthread_setaffinity_np(thread, sizeof(mask), &mask) == -1)
warn("Could not set CPU affinity to CPU #%d\n",
par->cpu);
+ /* read back affinity to verify it was set correctly */
+ if (pthread_getaffinity_np(thread, sizeof(mask), &mask_verify) == -1)
+ warn("Could not get CPU affinity for CPU #%d\n",
+ par->cpu);
+ if (!CPU_EQUAL(&mask, &mask_verify))
+ warn("CPU affinity was set incorrectly for CPU #%d\n",
+ par->cpu);
}
interval.tv_sec = par->interval / USEC_PER_SEC;
--
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
