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

From: Andrew Morton
Date: Wed Dec 27 2006 - 22:50:36 EST

On Thu, 28 Dec 2006 11:17:25 +0800
"Zhang, Yanmin" <yanmin_zhang@xxxxxxxxxxxxxxx> 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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