linux-kernel - Re: resend--[PATCH] improve read ahead in kernel

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Message-ID: <1355984435.1374.3.camel@kernel-VirtualBox>
Date:	Thu, 20 Dec 2012 01:20:35 -0500
From:	Simon Jeons <simon.jeons@...il.com>
To:	Eric Wong <normalperson@...t.net>
Cc:	xtu4 <xiaobing.tu@...el.com>, linux-kernel@...r.kernel.org,
	linux-tip-commits@...r.kernel.org, linux-mm@...ck.org,
	di.zhang@...el.com
Subject: Re: resend--[PATCH]  improve read ahead in kernel

On Sun, 2012-12-16 at 02:15 +0000, Eric Wong wrote:
> xtu4 <xiaobing.tu@...el.com> wrote:
> > resend it, due to format error
> > 
> > Subject: [PATCH] when system in low memory scenario, imaging there is a mp3
> >  play, ora video play, we need to read mp3 or video file
> >  from memory to page cache,but when system lack of memory,
> >  page cache of mp3 or video file will be reclaimed.once read
> >  in memory, then reclaimed, it will cause audio or video
> >  glitch,and it will increase the io operation at the same
> >  time.
> 
> To me, this basically describes how POSIX_FADV_NOREUSE should work.

Hi Eric,

But why fadvise POSIX_FADV_NOREUSE almost do nothing? Why not set some
flag or other things for these use once data?

> I would like to have this ability via fadvise (and not CONFIG_).
> 
> Also, I think your patch has too many #ifdefs to be accepted.
> 
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