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| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2010-06-03 01:23:04 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-06-09 11:12:35 +0200 |
| commit | 68aa00ac0a82e9a876c799bf6be7622b8f1c8517 (patch) | |
| tree | af59ed93f50dd539389956e5fe97f3ac0cd85cbe /kernel/perf_event.c | |
| parent | 8d2cacbbb8deadfae78aa16e4e1ee619bdd7019e (diff) | |
| download | talos-obmc-linux-68aa00ac0a82e9a876c799bf6be7622b8f1c8517.tar.gz talos-obmc-linux-68aa00ac0a82e9a876c799bf6be7622b8f1c8517.zip | |
perf, x86: Make a second write to performance counter if needed
On Netburst PMU we need a second write to a performance counter
due to cpu erratum.
A simple flag test instead of alternative instructions was choosen
because wrmsrl is already a macro and if virtualization is turned
on will need an additional wrapper call which is more expencise.
nb: we should propably switch to jump-labels as only this facility
reach the mainline.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100602212304.GC5264@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_event.c')
0 files changed, 0 insertions, 0 deletions
