linux-kernel - Re: [PATCH v5 1/2] perf: use hrtimer for event multiplexing

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Message-ID: <1364210014.5053.2.camel@laptop>
Date:	Mon, 25 Mar 2013 12:13:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, ak@...ux.intel.com,
	acme@...hat.com, jolsa@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v5 1/2] perf: use hrtimer for event multiplexing

On Fri, 2013-03-22 at 11:51 +0100, Stephane Eranian wrote:
> +#define PERF_CPU_HRTIMER (1000 / HZ)
> +static enum hrtimer_restart perf_cpu_hrtimer_handler(struct hrtimer
> *hr)
> +{
> +       struct perf_cpu_context *cpuctx;
> +       enum hrtimer_restart ret = HRTIMER_NORESTART;
> +       unsigned long flags;
> +       int rotations = 0;
> +
> +       cpuctx = container_of(hr, struct perf_cpu_context, hrtimer);
> +
> +       local_irq_save(flags);
> +
> +       rotations = perf_rotate_context(cpuctx);
> +
> +       local_irq_restore(flags);

IIRC hrtimer callbacks are always ran with interrupts disabled.. not a
big deal though. I'll continue reading.

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