linux-kernel - Re: [PATCH 1/9] perf: Remove redundant parent context check from context

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Message-ID: <20140902105036.GH5806@worktop.ger.corp.intel.com>
Date:	Tue, 2 Sep 2014 12:50:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Jen-Cheng(Tommy) Huang" <tommy24@...ech.edu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/9] perf: Remove redundant parent context check from
 context_equiv

On Mon, Aug 25, 2014 at 04:45:35PM +0200, Jiri Olsa wrote:
> As described in commit:
>   1f9a7268c67f perf: Do not allow optimized switch for non-cloned events
> we dont allow optimized switch for non cloned contexts.
> 
> There's no need now to check if one of the context is parent
> of the other in context_equiv function.
> 

OK, so talk to me about that patch; it looks like you're slowly
reverting: 5a3126d4fe7c ("perf: Fix the perf context switch
optimization").

So what exactly is the problem? I'm still jet-lagged and not seeing it.
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