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Message-ID: <20100929152745.GC9440@lenovo>
Date: Wed, 29 Sep 2010 19:27:45 +0400
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Robert Richter <robert.richter@....com>
Cc: Stephane Eranian <eranian@...gle.com>,
"mingo@...hat.com" <mingo@...hat.com>,
"hpa@...or.com" <hpa@...or.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"yinghai@...nel.org" <yinghai@...nel.org>,
"andi@...stfloor.org" <andi@...stfloor.org>,
"peterz@...radead.org" <peterz@...radead.org>,
"ying.huang@...el.com" <ying.huang@...el.com>,
"fweisbec@...il.com" <fweisbec@...il.com>,
"ming.m.lin@...el.com" <ming.m.lin@...el.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"dzickus@...hat.com" <dzickus@...hat.com>,
"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [tip:perf/urgent] perf, x86: Catch spurious interrupts after
disabling counters
On Wed, Sep 29, 2010 at 05:12:53PM +0200, Robert Richter wrote:
> On 29.09.10 17:01:40, Robert Richter wrote:
> > Right, I wasn't remembering correctly, it was P6 and core. And yes, P4
> > requires the fix. Will send a patch for this.
>
> Ok, Cyrill is sending the patch.
>
> Thanks,
>
> -Robert
>
Managed to implement it earlier then I thought.
Cyrill
---
Subject: [PATCH -tip] perf, x86: Handle in flight IRQs on P4 platform
Stephane reported we've missed to guard P4 platform
against spurious in-flight performance IRQs. Fix it.
[ the patch is a complement to commit 63e6be6d98e1 ]
Reported-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
CC: Robert Richter <robert.richter@....com>
CC: Lin Ming <ming.m.lin@...el.com>
---
arch/x86/kernel/cpu/perf_event_p4.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux-2.6.git/arch/x86/kernel/cpu/perf_event_p4.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/cpu/perf_event_p4.c
+++ linux-2.6.git/arch/x86/kernel/cpu/perf_event_p4.c
@@ -904,8 +904,12 @@ static int p4_pmu_handle_irq(struct pt_r
for (idx = 0; idx < x86_pmu.num_counters; idx++) {
int overflow;
- if (!test_bit(idx, cpuc->active_mask))
+ if (!test_bit(idx, cpuc->active_mask)) {
+ /* catch in-flight IRQs */
+ if (__test_and_clear_bit(idx, cpuc->running))
+ handled++;
continue;
+ }
event = cpuc->events[idx];
hwc = &event->hw;
--
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