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

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Message-Id: <20100521134205.781916350@chello.nl>
Date:	Fri, 21 May 2010 15:42:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/4] convert perf to local64_t

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.

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