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From: Jamie Iles <jamie@jamieiles.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Jamie Iles <jamie@jamieiles.com>,
	Paul Mackerras <paulus@samba.org>,
	linux-kernel@vger.kernel.org
Subject: Re: Perf events/ARM
Date: Tue, 1 Dec 2009 14:53:05 +0000	[thread overview]
Message-ID: <20091201145305.GC4061@wear.picochip.com> (raw)
In-Reply-To: <1259678444.1697.487.camel@laptop>

Pete, Ingo,

On Tue, Dec 01, 2009 at 03:40:44PM +0100, Peter Zijlstra wrote:
> Things like wakeups and ->event_limit might get delayed.
> 
> Delayed wakeups can be mitigated by larger buffers, delayed disable on
> ->event_limit is not something you can fix up.
> 
> Does your PMU generate regular interrupts or actual NMIs? If its normal
> interrupts you can simply call perf_event_do_pending() at the
> pmu-interrupt tail.
The PMU generates regular interrupts and in the case of the platform I'm
working on these go to a regular vectored interrupt controller all sharing the
same vector. So I'll add a call to perf_event_do_pending() at the tail of the
PMU IRQ and leave set_perf_event_pending() as a nop.

Thanks,

Jamie

      reply	other threads:[~2009-12-01 14:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-01 12:04 Perf events/ARM Jamie Iles
2009-12-01 14:31 ` Ingo Molnar
2009-12-01 14:40   ` Peter Zijlstra
2009-12-01 14:53     ` Jamie Iles [this message]

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