linux-kernel - Re: [PATCH 2/3] perf: clarify comment regarding event merging

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Message-ID: <20140110093635.GI31570@twins.programming.kicks-ass.net>
Date:	Fri, 10 Jan 2014 10:36:35 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] perf: clarify comment regarding event merging

On Thu, Jan 09, 2014 at 03:51:31PM -0800, Cody P Schafer wrote:
> There are actually 2 things about software events that allow us to
> merge them: they never fail to schedule _and_ they have transaction
> handlers we can (and do, when they are added to !sw groups) ignore. Note
> both of these in the comment on adding sw events to !sw groups.

The latter is a direct consequence of the former. Since they can always
be scheduled, they don't need any schedulability testing, and therefore
the transaction stuff is useless.


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