Re: [PATCH] perf_events: improve x86 event scheduling (v5)

From: Stephane Eranian
Date: Thu Jan 21 2010 - 05:43:19 EST

On Thu, Jan 21, 2010 at 11:36 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Mon, 2010-01-18 at 10:58 +0200, Stephane Eranian wrote:
>> Âvoid hw_perf_enable(void)
>> Â{
>> + Â Â Â Â Â Â Â cpuc->n_added = 0;
>> + Â Â Â Â Â Â Â perf_events_lapic_init();
> Just wondering, why do we need that lapic_init() there?
I think I picked it up from x86_pmu_enable(). I don't think
you necessarily need it here. Not clear to me why it was
in x86_pmu_enable() to begin with.

I will post a new version of the patch which fixes some bugs and
also implements true fast path (reuse of previous assignment). It turned
out, things were a bit more complicated than what I had in v5.
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