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From: Fengguang Wu <fengguang.wu@gmail.com>
To: Andrew Morton <akpm@osdl.org>
Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drop page cache of a single file
Date: Thu, 28 Dec 2006 15:19:04 +0800	[thread overview]
Message-ID: <367290328.14058@ustc.edu.cn> (raw)
Message-ID: <20061228071903.GA5702@mail.ustc.edu.cn> (raw)
In-Reply-To: <20061227194959.0ebce0e4.akpm@osdl.org>

On Wed, Dec 27, 2006 at 07:49:59PM -0800, Andrew Morton wrote:
> On Thu, 28 Dec 2006 11:17:25 +0800
> "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> wrote:
> 
> > Currently, by /proc/sys/vm/drop_caches, applications could drop pagecache,
> > slab(dentries and inodes), or both, but applications couldn't choose to
> > just drop the page cache of one file. An user of VOD (Video-On-Demand)
> > needs this capability to have more detailed control on page cache release.
> 
> The posix_fadvise() system call should be used for this.  Probably in
> combination with sys_sync_file_range().

Yanmin: I've been using the fadvise tool from
http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz

It's a nice tool:

% fadvise 
Usage: fadvise filename offset length advice [loops]
      advice: normal sequential willneed noreuse dontneed asyncwrite writewait
% fadvise /var/sparse 0 0x7fffffff dontneed

Regards,
Wu

  reply	other threads:[~2006-12-28  7:19 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-28  3:17 [PATCH] drop page cache of a single file Zhang, Yanmin
2006-12-28  3:49 ` Andrew Morton
2006-12-28  7:19   ` Fengguang Wu [this message]
2006-12-28  7:19     ` Fengguang Wu
2006-12-28 10:29       ` Andrew Morton
2006-12-28 10:45         ` Russell King
2006-12-28 11:03           ` Andrew Morton
2006-12-28 10:57         ` Fengguang Wu
2006-12-28 10:57           ` Fengguang Wu
2007-01-28  7:08 ` Vaidyanathan Srinivasan

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