ARM: perf: lock PMU registers per-CPU

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Currently, a single lock serialises access to CPU PMU registers. This
global locking is unnecessary as PMU registers are local to the CPU
they monitor.

This patch replaces the global lock with a per-CPU lock. As the lock is
in struct cpu_hw_events, PMUs providing a single cpu_hw_events instance
can be locked globally.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Mark Rutland 2011-04-28 10:17:04 +01:00 • committed by Will Deacon

parent 1b69beb768

commit 0f78d2d5cc

4 changed files with 62 additions and 40 deletions

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17

arch/arm/kernel/perf_event.c

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25

arch/arm/kernel/perf_event_v6.c

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20

arch/arm/kernel/perf_event_v7.c

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40

arch/arm/kernel/perf_event_xscale.c

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