linux-kernel - Re: register_timer_hook use in arch/sh/oprofile

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Message-Id: <1245999685.31755.157.camel@twins>
Date:	Fri, 26 Jun 2009 09:01:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: register_timer_hook use in arch/sh/oprofile

On Wed, 2009-06-24 at 15:24 +0200, Ingo Molnar wrote:
> 
> [ And long-term analysis ('perf stat' type of runs) dont need IRQs 
>   anyway - perfcounters reads outs the counts and summarizes them 
>   across the measured workload. ]

If the counter width is less than 64 bits we do need to have some
interrupt to read them from before they cycle so we can accumulate the
deltas into a proper u64.

But for proper 64 bit hardware counters there is indeed no need for
that.
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