| commit | f4f38430c94c38187db73a2cf3892cc8b12a2713 | |
| author | Will Deacon <will.deacon@arm.com> | |
| Fri, 1 Jul 2011 13:38:12 +0000 (1 14:38 +0100) | ||
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | |
| Tue, 5 Jul 2011 11:37:23 +0000 (5 12:37 +0100) | ||
| tree | e8101e5202bfe600f928f3f2400dfd5afa4b54f6 | treesnapshot (tar.gz zip) |
| parent | 178783622ce0fd629fad21b33b8f8f56b64c5e45 | commitdiff |
ARM: 6989/1: perf: do not start the PMU when no events are present
armpmu_enable can be called in situations where no events are present
(for example, from the event rotation tick after a profiled task has
exited). In this case, we currently start the PMU anyway which may
leave it active inevitably without any events being monitored.
This patch adds a simple check to the enabling code so that we avoid
starting the PMU when no events are present.
Cc: <stable@kernel.org>
Reported-by: Ashwin Chaugle <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
armpmu_enable can be called in situations where no events are present
(for example, from the event rotation tick after a profiled task has
exited). In this case, we currently start the PMU anyway which may
leave it active inevitably without any events being monitored.
This patch adds a simple check to the enabling code so that we avoid
starting the PMU when no events are present.
Cc: <stable@kernel.org>
Reported-by: Ashwin Chaugle <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| arch/arm/kernel/perf_event.c | diffblobblamehistory |