| commit | 4295ee62660b13ddb87d41539f49b239e6e7d56f | [log] [tgz] |
|---|---|---|
| author | Robert Richter <robert.richter@amd.com> | Wed Apr 29 12:47:01 2009 +0200 |
| committer | Ingo Molnar <mingo@elte.hu> | Wed Apr 29 14:51:02 2009 +0200 |
| tree | bdd7c1b1c1b4c1c4b05d42d4837c6fbf8ad5e5f8 | |
| parent | 4138960a9251a265002b5cf07e671a49f8495381 [diff] |
perf_counter, x86: rework pmc_amd_save_disable_all() and pmc_amd_restore_all() MSR reads and writes are expensive. This patch adds checks to avoid its usage where possible. [ Impact: micro-optimization on AMD CPUs ] Signed-off-by: Robert Richter <robert.richter@amd.com> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1241002046-8832-5-git-send-email-robert.richter@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>