linux-kernel - Re: [PATCH 2/2] perf_counter: optimize context switch between identical inherited contexts

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Message-ID: <18969.56962.588194.319564@cargo.ozlabs.ibm.com>
Date:	Mon, 25 May 2009 09:55:46 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] perf_counter: optimize context switch between
	identical inherited contexts

Ingo Molnar writes:

> OTOH, enabling/disabling counters in specific functions of a library 
> might be a valid use-case.

If that's the use case, wouldn't we wouldn't the "enable" to restore
the previous state, rather than enabling all counters?

Paul.
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