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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-05-13 16:21:38 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-15 09:47:02 +0200 |
| commit | 9e35ad388bea89f7d6f375af4c0ae98803688666 (patch) | |
| tree | 9abbce9f6c9a914b1ea8d8dae82e159366030e4a /drivers/rapidio/Kconfig | |
| parent | 962bf7a66edca4d36a730a38ff8410a67f560e40 (diff) | |
perf_counter: Rework the perf counter disable/enable
The current disable/enable mechanism is:
token = hw_perf_save_disable();
...
/* do bits */
...
hw_perf_restore(token);
This works well, provided that the use nests properly. Except we don't.
x86 NMI/INT throttling has non-nested use of this, breaking things. Therefore
provide a reference counter disable/enable interface, where the first disable
disables the hardware, and the last enable enables the hardware again.
[ Impact: refactor, simplify the PMU disable/enable logic ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/rapidio/Kconfig')
0 files changed, 0 insertions, 0 deletions