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| author | jimharris <jimharris@FreeBSD.org> | 2012-08-22 20:22:55 +0000 |
|---|---|---|
| committer | jimharris <jimharris@FreeBSD.org> | 2012-08-22 20:22:55 +0000 |
| commit | a49bdc9a252d8c144ed4c8d040b34a1e2ce6e653 (patch) | |
| tree | 4d371bc1b95315baf3235a48ed3c94ff639228a5 /usr.sbin/chroot | |
| parent | 9d2e20143f198869149c9e2dc114da6153f2df12 (diff) | |
| download | FreeBSD-src-a49bdc9a252d8c144ed4c8d040b34a1e2ce6e653.zip FreeBSD-src-a49bdc9a252d8c144ed4c8d040b34a1e2ce6e653.tar.gz | |
Remove unncessary atomic operation when reading process flags in
PMC_PROC_IS_USING_PMCS macro.
Invocations of this macro are not synchronized with setting/clearing
of P_HWPMC flag, so the atomic operation here isn't needed. Removing
the atomic operation provides noticeable improvement (5-6%) on
some scheduler-intensive workloads with HWPMC_HOOKS enabled on an
8C Sandy Bridge Xeon system.
Sponsored by: Intel
Reviewed by: jhb
MFC after: 1 week
Diffstat (limited to 'usr.sbin/chroot')
0 files changed, 0 insertions, 0 deletions
