linux-kernel - Re: [PATCH -rt] perf: make swevent hrtimer run in irq instead of softirq

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Message-ID: <1341476945.7709.1.camel@twins>
Date:	Thu, 05 Jul 2012 10:29:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH -rt] perf: make swevent hrtimer run in irq instead of
 softirq

On Thu, 2012-07-05 at 16:21 +0800, Yong Zhang wrote:
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index fd126f8..451d452 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -5403,6 +5403,7 @@ static void perf_swevent_init_hrtimer(struct perf_event *event)
>  
>         hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
>         hwc->hrtimer.function = perf_swevent_hrtimer;
> +       hwc->hrtimer.irqsafe = 1;
>  
>         /*
>          * Since hrtimers have a fixed rate, we can do a static freq->period 

Yes this is correct.. curious we lost that. I'm sure I've done this
before.
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