linux-kernel - Re: [PATCH] drop page cache of a single file

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Message-Id: <20061227194959.0ebce0e4.akpm@osdl.org>
Date:	Wed, 27 Dec 2006 19:49:59 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drop page cache of a single file

On Thu, 28 Dec 2006 11:17:25 +0800
"Zhang, Yanmin" <yanmin_zhang@...ux.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().

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