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| author | Clark Williams <williams@redhat.com> | 2017-04-24 12:05:15 -0500 |
|---|---|---|
| committer | John Kacur <jkacur@redhat.com> | 2017-04-24 21:51:31 +0200 |
| commit | 193ed3d12ebe20817ac19a53a8f87c992283dda1 (patch) | |
| tree | 2345592f3a6286cdf92b91d1bdb56b6957b291b3 | |
| parent | 9d2c9edd86943dfea399a0176826af8bb92bf97c (diff) | |
| download | rt-tests-193ed3d12ebe20817ac19a53a8f87c992283dda1.tar.gz | |
cyclictest: touch threadstacks on numa to pre-fault them
On a numa system we allocate a stack from the closest NUMA node
for each measurement thread. We need to touch those stack pages
to prevent them faulting when first run. Not a big deal on a
system with just a few cores, but overhead adds up with 32+ cores.
Signed-off-by: Clark Williams <williams@redhat.com>
Signed-off-by: John Kacur <jkacur@redhat.com>
| -rw-r--r-- | src/cyclictest/cyclictest.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c index 0b13441..48791c1 100644 --- a/src/cyclictest/cyclictest.c +++ b/src/cyclictest/cyclictest.c @@ -2377,6 +2377,9 @@ int main(int argc, char **argv) /* allocate memory for a stack on appropriate node */ stack = rt_numa_numa_alloc_onnode(stksize, node, i); + /* touch the stack pages to pre-fault them in */ + memset(stack, 0, stksize); + /* set the thread's stack */ if (pthread_attr_setstack(&attr, stack, stksize)) fatal("failed to set stack addr for thread %d to 0x%x\n", |