This is a note to let you know that I've just added the patch titled
ARM: perf: hook up perf_sample_event_took around pmu irq handling
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-perf-hook-up-perf_sample_event_took-around-pmu-irq-handling.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5f5092e72cc25a6a5785308270e0085b2b2772cc Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@xxxxxxx>
Date: Tue, 11 Feb 2014 18:08:41 +0000
Subject: ARM: perf: hook up perf_sample_event_took around pmu irq handling
From: Will Deacon <will.deacon@xxxxxxx>
commit 5f5092e72cc25a6a5785308270e0085b2b2772cc upstream.
Since we indirect all of our PMU IRQ handling through a dispatcher, it's
trivial to hook up perf_sample_event_took to prevent applications such
as oprofile from generating interrupt storms due to an unrealisticly
low sample period.
Reported-by: Robert Richter <rric@xxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Weng Meiling <wengmeiling.weng@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/perf_event.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -303,11 +303,18 @@ static irqreturn_t armpmu_dispatch_irq(i
struct arm_pmu *armpmu = (struct arm_pmu *) dev;
struct platform_device *plat_device = armpmu->plat_device;
struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev);
+ int ret;
+ u64 start_clock, finish_clock;
+ start_clock = sched_clock();
if (plat && plat->handle_irq)
- return plat->handle_irq(irq, dev, armpmu->handle_irq);
+ ret = plat->handle_irq(irq, dev, armpmu->handle_irq);
else
- return armpmu->handle_irq(irq, dev);
+ ret = armpmu->handle_irq(irq, dev);
+ finish_clock = sched_clock();
+
+ perf_sample_event_took(finish_clock - start_clock);
+ return ret;
}
static void
Patches currently in stable-queue which might be from will.deacon@xxxxxxx are
queue-3.10/usb-avoid-runtime-suspend-loops-for-hcds-that-can-t-handle-suspend-resume.patch
queue-3.10/arm-perf-hook-up-perf_sample_event_took-around-pmu-irq-handling.patch
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