linux-kernel - Re: [PATCH] perf: Store active software events in a hashlist

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Date:	Wed, 7 Apr 2010 14:06:56 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] perf: Store active software events in a hashlist

On Wed, Apr 07, 2010 at 01:58:20PM +0200, Peter Zijlstra wrote:
> On Wed, 2010-04-07 at 13:56 +0200, Frederic Weisbecker wrote:
> > 
> > > 
> > > So looks good, altough I think we want to do that online/hotplug thing.
> > 
> > 
> > That would let us allocate on online cpus instead of possibles? Yeah right.
> 
> Right, so if you want to go this route (and not simply embed it in the
> percpu data), the complication I thought of is that you want the
> refcount on offline cpus but not the allocation, since its very hard to
> reconstruct the number of events that had event->cpu == -1.


Ok, right I can do that.

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