linux-kernel - Re: [PATCH] alpha: Shift perf event pending work earlier in timer interrupt

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Message-ID: <AANLkTimoyT7KLtrNL3Wkvcxg1Da6-EdHP5MaKBbh0B1e@mail.gmail.com>
Date:	Sun, 19 Sep 2010 00:51:18 -0400
From:	Matt Turner <mattst88@...il.com>
To:	Michael Cree <mcree@...on.net.nz>
Cc:	linux-kernel@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, linux-alpha@...r.kernel.org
Subject: Re: [PATCH] alpha: Shift perf event pending work earlier in timer interrupt

On Sat, Sep 18, 2010 at 10:05 PM, Michael Cree <mcree@...on.net.nz> wrote:
> Pending work from the performance event subsystem is executed in
> the timer interrupt.  This patch shifts the call to
> perf_event_do_pending() before the call to update_process_times()
> as the latter may call back into the perf event subsystem and it
> is prudent to have the pending work executed first.
>
> Signed-off-by: Michael Cree <mcree@...on.net.nz>
> ---
>  arch/alpha/kernel/time.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c
> index eacceb2..396af17 100644
> --- a/arch/alpha/kernel/time.c
> +++ b/arch/alpha/kernel/time.c
> @@ -191,16 +191,16 @@ irqreturn_t timer_interrupt(int irq, void *dev)
>
>        write_sequnlock(&xtime_lock);
>
> -#ifndef CONFIG_SMP
> -       while (nticks--)
> -               update_process_times(user_mode(get_irq_regs()));
> -#endif
> -
>        if (test_perf_event_pending()) {
>                clear_perf_event_pending();
>                perf_event_do_pending();
>        }
>
> +#ifndef CONFIG_SMP
> +       while (nticks--)
> +               update_process_times(user_mode(get_irq_regs()));
> +#endif
> +
>        return IRQ_HANDLED;
>  }
>
> --
> 1.7.1

Thanks! Added to my tree and sent to Linus.
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