From: tip-bot for Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com,
a.p.zijlstra@chello.nl, tglx@linutronix.de, mingo@elte.hu
Subject: [tip:perf/fast] perf: Fix mmap_page::offset computation
Date: Wed, 21 Dec 2011 03:48:10 -0800 [thread overview]
Message-ID: <tip-1ixr3olci40w8rgv2evv2ldh@git.kernel.org> (raw)
Commit-ID: 365a4038486b57bb2bd516706a80f82f250f5306
Gitweb: http://git.kernel.org/tip/365a4038486b57bb2bd516706a80f82f250f5306
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Mon, 21 Nov 2011 20:58:59 +0100
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 21 Dec 2011 11:01:09 +0100
perf: Fix mmap_page::offset computation
There's multiple reason the counter might be unavailable, change the
condition to !->index since perf_event_index() should return 0 for all
those cases.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-1ixr3olci40w8rgv2evv2ldh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/events/core.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3894309..05affc3 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3268,7 +3268,7 @@ void perf_event_update_userpage(struct perf_event *event)
barrier();
userpg->index = perf_event_index(event);
userpg->offset = perf_event_count(event);
- if (event->state == PERF_EVENT_STATE_ACTIVE)
+ if (userpg->index)
userpg->offset -= local64_read(&event->hw.prev_count);
userpg->time_enabled = enabled +
reply other threads:[~2011-12-21 11:48 UTC|newest]
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