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

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Date:	Sun, 16 Dec 2012 02:15:08 +0000
From:	Eric Wong <normalperson@...t.net>
To:	xtu4 <xiaobing.tu@...el.com>
Cc:	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

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.
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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