From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Stephane Eranian <eranian@google.com>, Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH 4/7] perf, x86: Fixup the precise_ip computation
Date: Tue, 19 Oct 2010 15:43:00 +0200 [thread overview]
Message-ID: <20101019134808.354429461@chello.nl> (raw)
In-Reply-To: 20101019134256.087045503@chello.nl
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[-- Type: text/plain, Size: 867 bytes --]
In case we don't have PEBS, the LBR fixup doesn't make sense.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
---
arch/x86/kernel/cpu/perf_event.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
Index: linux-2.6/arch/x86/kernel/cpu/perf_event.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/perf_event.c
+++ linux-2.6/arch/x86/kernel/cpu/perf_event.c
@@ -497,12 +497,13 @@ static int x86_pmu_hw_config(struct perf
int precise = 0;
/* Support for constant skid */
- if (x86_pmu.pebs)
+ if (x86_pmu.pebs) {
precise++;
- /* Support for IP fixup */
- if (x86_pmu.lbr_nr)
- precise++;
+ /* Support for IP fixup */
+ if (x86_pmu.lbr_nr)
+ precise++;
+ }
if (event->attr.precise_ip > precise)
return -EOPNOTSUPP;
next prev parent reply other threads:[~2010-10-19 13:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-19 13:42 [PATCH 0/7] perf,x86: PEBS/BTS buffer allocation changes Peter Zijlstra
2010-10-19 13:42 ` [PATCH 1/7] perf, x86: Extract PEBS/BTS buffer free routines Peter Zijlstra
2010-10-22 13:02 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-10-19 13:42 ` [PATCH 2/7] perf, x86: Extract PEBS/BTS allocation functions Peter Zijlstra
2010-10-22 13:02 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-10-19 13:42 ` [PATCH 3/7] perf, x86: Extract DS alloc/free functions Peter Zijlstra
2010-10-22 13:03 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-10-19 13:43 ` Peter Zijlstra [this message]
2010-10-22 13:03 ` [tip:perf/urgent] perf, x86: Fixup the precise_ip computation tip-bot for Peter Zijlstra
2010-10-22 13:04 ` [tip:perf/urgent] perf, x86: Less disastrous PEBS/BTS buffer allocation failure tip-bot for Peter Zijlstra
2010-10-19 13:43 ` [PATCH 5/7] " Peter Zijlstra
2010-10-19 13:43 ` [PATCH 6/7] perf, x86: Clean up reserve_ds_buffers() signature Peter Zijlstra
2010-10-22 13:04 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-10-19 13:43 ` [PATCH 7/7] perf, x86: Use NUMA aware allocations for PEBS/BTS/DS allocations Peter Zijlstra
2010-10-22 13:04 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-10-21 11:35 ` [PATCH 0/7] perf,x86: PEBS/BTS buffer allocation changes Peter Zijlstra
2010-10-21 11:45 ` Stephane Eranian
2010-10-21 14:30 ` Stephane Eranian
2010-10-21 14:34 ` Peter Zijlstra
2010-10-21 14:35 ` Stephane Eranian
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