> > Does perf_event_fsl_emb.c need this as well (it has almost the same
> > record_and_restart code)?
>
> I would think so.
Good point:
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 <an...@samba.org>
---
This is only compile tested.
Index: powerpc.git/arch/powerpc/kernel/perf_event_fsl_emb.c
===================================================================
--- powerpc.git.orig/arch/powerpc/kernel/perf_event_fsl_emb.c 2011-01-18
21:23:57.761644115 +1100
+++ powerpc.git/arch/powerpc/kernel/perf_event_fsl_emb.c 2011-01-18
21:25:28.994477247 +1100
@@ -596,6 +596,7 @@ static void record_and_restart(struct pe
if (left <= 0)
left = period;
record = 1;
+ event->hw.last_period = event->hw.sample_period;
}
if (left < 0x80000000LL)
val = 0x80000000LL - left;
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