linux-kernel - Re: [PATCH 2/2] perf record: mmap output file

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Date:	Mon, 11 Nov 2013 13:44:20 -0700
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/2] perf record: mmap output file - v4

On 11/11/13, 1:41 PM, Ingo Molnar wrote:
>
> * David Ahern <dsahern@...il.com> wrote:
>
>> On 11/11/13, 7:58 AM, Arnaldo Carvalho de Melo wrote:
>>>
>>>> Looks very clean now!
>>>
>>>> Acked-by: Ingo Molnar <mingo@...nel.org>
>>>
>>> Applied the prep patch, but waiting for v5 as stated by David when
>>> answering Jiri's concerns.
>>
>> I'll re-send - giving some time for comments on the use of
>> setjmp/longjmp to bounce out of memcpy and error exit when filesystem
>> runs out of space.
>
> Maybe that could be an add-on patch instead?

That's what Arnaldo and I were thinking.
>
> All the rest would already be an improvement, right?

Yes. The longjmp handles the out-of-space failure condition trying to 
write the data to a file. With mmap writes you get a SIGBUS when the 
filesystem is full and you need to bail out of the memcpy.

David
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