linux-kernel - Re: madvise(2) MADV

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Date:	Thu, 17 Jul 2008 10:21:48 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Eric Rannaud <eric.rannaud@...il.com>,
	Chris Snook <csnook@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: madvise(2) MADV_SEQUENTIAL behavior

On Thu, 17 Jul 2008 16:14:29 +1000
Nick Piggin <nickpiggin@...oo.com.au> wrote:

> > It might encourage user space applications to start using
> > FADV_SEQUENTIAL or FADV_NOREUSE more often (as it would become
> > worthwhile to do so), and if they do (especially cron jobs), the problem
> > of the slow desktop in the morning would progressively solve itself.
> 
> The slow desktop in the morning should not happen even without such a
> call, because the kernel should not throw out frequently used data (even
> if it is not quite so recent) in favour of streaming data.
> 
> OK, I figure it doesn't do such a good job now, which is sad, 

Do you have any tests in mind that we could use to decide
whether the patch I posted Tuesday would do a decent job
at protecting frequently used data from streaming data?

http://lkml.org/lkml/2008/7/15/465

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