linux-kernel - Re: [RELEASE] ltt-control 0.86, better streaming fadvise

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Date:	Wed, 19 May 2010 22:11:39 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	ltt-dev@...ts.casi.polymtl.ca
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RELEASE] ltt-control 0.86, better streaming fadvise

A discussion follow-up with Linus made me change the implementation to put the
fadvise after the synchronous page writeback, to ensure better streaming
behavior.

Mathieu

* Mathieu Desnoyers (mathieu.desnoyers@...icios.com) wrote:
> Hi,
> 
> I just released ltt-control 0.85 which waits for previous subbuffers to be
> written to disk (using sync_file_range()) and uses fadvise to tell the kernel
> that pages won't be reaccessed. This lessens the tracer impact on the page
> cache.
> 
> Thanks to Linus for hints on how to use fadvise and sync_file_range to do
> this, c.f.:
> 
> http://marc.info/?l=linux-kernel&m=127430576309253&w=2
> 
> Mathieu
> 
> -- 
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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