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| author | Todd Poynor <toddpoynor@google.com> | 2010-11-08 20:26:23 -0800 |
|---|---|---|
| committer | Todd Poynor <toddpoynor@google.com> | 2010-12-22 17:09:24 -0800 |
| commit | 4e5206fb786eba459f317b9386d2b3767f0bf50d (patch) | |
| tree | 28c966834540f74397d8ce1c6c967f9a57c84983 | |
| parent | e2760fa5d1b1318212753147f207696add2177f5 (diff) | |
| download | qemu-4e5206fb786eba459f317b9386d2b3767f0bf50d.tar.gz | |
ARM: Stop irqsoff trace on return to user
If the irqsoff tracer is in use, stop tracing the interrupt disable
interval when returning to userspace. Tracing userspace execution
time as interrupts disabled time is not helpful for kernel
performance analysis purposes. Only do so if the irqsoff tracer
is enabled, to avoid overhead purely for lockdep, which doesn't
care.
Change-Id: I74cde7dd0c4c3a783af34e76bd4efc1f85315abe
Signed-off-by: Todd Poynor <toddpoynor@google.com>
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 7885722bdf4..c4a7050d878 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -29,6 +29,9 @@ ret_fast_syscall: ldr r1, [tsk, #TI_FLAGS] tst r1, #_TIF_WORK_MASK bne fast_work_pending +#if defined(CONFIG_IRQSOFF_TRACER) + asm_trace_hardirqs_on +#endif /* perform architecture specific actions before user return */ arch_ret_to_user r1, lr @@ -65,6 +68,9 @@ ret_slow_syscall: tst r1, #_TIF_WORK_MASK bne work_pending no_work_pending: +#if defined(CONFIG_IRQSOFF_TRACER) + asm_trace_hardirqs_on +#endif /* perform architecture specific actions before user return */ arch_ret_to_user r1, lr |