linux-kernel - Re: [PATCH 1/1] perf,tools: add time out to force stop endless mmap processing

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Message-ID: <557A28F6.8040603@gmail.com>
Date:	Thu, 11 Jun 2015 18:33:58 -0600
From:	David Ahern <dsahern@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>, kan.liang@...el.com,
	linux-kernel@...r.kernel.org, ying.huang@...el.com
Subject: Re: [PATCH 1/1] perf,tools: add time out to force stop endless mmap
 processing

On 6/11/15 12:47 PM, Andi Kleen wrote:
>> Can you elaborate on an example? I don't see how this can happen
>> reading a maps file. And it does not read maps for all threads only
>> thread group leaders.
>
> This is with a stress test case that generates lots of small mappings
> at very high speed and frees them again. So the maps file keeps changing
> faster than the proc reader can keep it and it can end up with
> a live lock.

Can you pass it along? I'd like to see how the task_diag proposal 
handles it.

https://github.com/dsahern/linux/commits/task_diag-wip
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