linux-kernel - Re: [PATCH 0/4] convert perf to local64

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Message-ID: <20100526100844.GB5311@nowhere>
Date:	Wed, 26 May 2010 12:08:48 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>,
	Paul Mundt <lethal@...ux-sh.org>,
	Will Deacon <will.deacon@....com>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] convert perf to local64_t

On Fri, May 21, 2010 at 03:42:05PM +0200, Peter Zijlstra wrote:
> These patches introduce local64_t.
> 
> Since perf_event:count is only modified cross-cpu when child-counters
> feed back their changes on exit, and we can use a secondary variable
> for that, we can convert perf to use local64_t instead of atomic64_t
> and use instructions without buslock semantics.
> 
> The local64_t implementation uses local_t for 64 bits, since local_t is
> of type long, for 32 bit it falls back to atomic64_t. Architectures can
> provide their own implementation as usual.


It seems nobody disagrees with it. Can we give it a try?

Thanks.

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