linux-kernel - Re: [PATCH] perf tools: Exit recording if events have non matching sample type

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Message-ID: <4E8A8842.9010509@gmail.com>
Date:	Mon, 03 Oct 2011 22:14:58 -0600
From:	David Ahern <dsahern@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jiri Olsa <jolsa@...hat.com>, mingo@...e.hu, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Exit recording if events have non matching
 sample type

On 09/30/2011 01:39 AM, Peter Zijlstra wrote:
> On Thu, 2011-09-29 at 17:33 -0600, David Ahern wrote:
>>> For record that means we need to dump each per-sample_id mmap onto a
>>> separate file, i.e. use a directory, etc.
>>
>> That seems like a major re-write of perf. 
> 
> Well we want to go there anyway. A file per cpu stream can be a lot less
> overhead than one file for all cpu streams.
> 

really it becomes file per cpu stream and per sample type. So a dual
socket, quad core with HT means 16 files per sample type. ie., the
number of files explodes quick.

I understand the allure for simplicity during the data collection. Has
any thought been given on management of the files in such a scenario?
User specifies a directory path instead of a file path - or both to
handle backward compatibility?

David
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