[tip:perf/urgent] powerpc, perf: Fix frequency calculation for overflowing counters (FSL version)

tip-bot for Anton Blanchard
2011-01-19T19:20:10Z

Commit-ID: 8c8a9b25b5de3f1eeac721cf34f4379e56d5d694
Gitweb: http://git.kernel.org/tip/8c8a9b25b5de3f1eeac721cf34f4379e56d5d694
Author: Anton Blanchard <anton@samba.org>
AuthorDate: Tue, 18 Jan 2011 21:44:04 +1100
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 19 Jan 2011 20:05:42 +0100

powerpc, perf: Fix frequency calculation for overflowing counters (FSL version)

When fixing the frequency calculations for perf on powerpc I
forgot to fix the FSL version.

If we dont set event->hw.last_period the frequency to period
calculations in perf go haywire and we continually
throttle/unthrottle the PMU.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110118214404.2f42e634@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/powerpc/kernel/perf_event_fsl_emb.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/perf_event_fsl_emb.c b/arch/powerpc/kernel/perf_event_fsl_emb.c
index 4dcf5f8..b0dc8f7 100644
--- a/arch/powerpc/kernel/perf_event_fsl_emb.c
+++ b/arch/powerpc/kernel/perf_event_fsl_emb.c
@@ -596,6 +596,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val,