linux-kernel - Re: [PATCH 0/5] VFS: Directory level cache cleaning

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Date:	Mon, 16 Dec 2013 09:45:22 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Li Wang <liwang@...ntukylin.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Sage Weil <sage@...tank.com>, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Yunchuan Wen <yunchuanwen@...ntukylin.com>
Subject: Re: [PATCH 0/5] VFS: Directory level cache cleaning

On Mon, Dec 16, 2013 at 7:00 AM, Li Wang <liwang@...ntukylin.com> wrote:
> This patch extend the 'drop_caches' interface to
> support directory level cache cleaning and has a complete
> backward compatibility. '{1,2,3}' keeps the same semantics
> as before. Besides, "{1,2,3}:DIRECTORY_PATH_NAME" is allowed
> to recursively clean the caches under DIRECTORY_PATH_NAME.
> For example, 'echo 1:/home/foo/jpg > /proc/sys/vm/drop_caches'
> will clean the page caches of the files inside 'home/foo/jpg'.
>

This interface is ugly...

And we already have a file-level drop cache, that is,
fadvise(DONTNEED). Can you extend it if it can't
handle a directory fd?
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