linux-kernel - Re: [PATCH] perf: fix possible divide-by-zero in perf_swevent

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Message-ID: <20100827133735.GC5241@nowhere>
Date:	Fri, 27 Aug 2010 15:37:37 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	DDD <dongdong.deng@...driver.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	acme@...hat.com, paulus@...ba.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix possible divide-by-zero in
	perf_swevent_overflow()

On Fri, Aug 27, 2010 at 09:19:39PM +0800, DDD wrote:
> Peter Zijlstra wrote:
>> On Fri, 2010-08-27 at 20:21 +0800, DDD wrote:
>>
>>>>> Maybe the root cause was from kgdb/hw_breakpoint_layer,
>>>> Yeah, I think there's a bug in the hw_breakpoint stuff, does something
>>>> like the below fix it?
>>
>>> Thanks for your patch, but I still could reproduce the problem with 
>>> your patch.
>>
>> Frederic, any clue as to what makes hw breakpoints go funny and have
>> last_period == 0?
>
> Hi Peter,
>
> Thanks for you take care of it, I have got the root cause of it now.
>
> It is the kgdb using hw_breakpoint_layer's API problem, and I have a RFC  
> patch for it.(maybe it is not correctly), I will contact with Jason to  
> fix this problem.
>
> Thank you very much,
> Dongdong


Thanks!

We are waiting for your patch then.

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