linux-kernel - Re: [PATCH] perf: fix interrupt handler timing harness

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Message-ID: <20130705065435.GA6699@gmail.com>
Date:	Fri, 5 Jul 2013 08:54:35 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	dave.hansen@...ux.intel.com, ak@...ux.intel.com, jolsa@...hat.com
Subject: Re: [PATCH] perf: fix interrupt handler timing harness


* Stephane Eranian <eranian@...gle.com> wrote:

> This patch fixes a serious bug in:
> 
> commit 14c63f17b1fde5a575a28e96547a22b451c71fb5
> Author: Dave Hansen <dave.hansen@...ux.intel.com>
> Date:   Fri Jun 21 08:51:36 2013 -0700
> 
>     perf: Drop sample rate when sampling is too slow
>     
> 
> There was an misunderstanding on the API of the do_div()
> macro. It returns the remainder of the division and this
> was not what the function expected leading to disabling the
> interrupt latency watchdog.
> 
> This patch also remove a duplicate assignment in
> perf_sample_event_took().
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>

Thanks Stephane - I've applied this to perf/urgent and will get it to 
Linus ASAP.

	Ingo
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