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

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Date:	Wed, 24 Jun 2009 22:40:20 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: register_timer_hook use in arch/sh/oprofile

Paul Mundt writes:

> Yes, that all works fine. My comment was more in reference to the
> hardware performance counters that don't have IRQs of their own, which
> still need to be tied in to the perf_counter API.

For them you would need to check in hw_perf_counter_init() that
counter->attr.sample_period is zero, and fail with an -EINVAL error if
it isn't.

Paul.
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