linux-kernel - Re: [PATCH] sysctl: Add a feature to drop caches selectively

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Message-ID: <alpine.DEB.2.02.1406241458140.29176@chino.kir.corp.google.com>
Date:	Tue, 24 Jun 2014 14:59:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Maksym Planeta <mcsim.planeta@...il.com>
cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Thomas Knauth <thomas.knauth@....de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysctl: Add a feature to drop caches selectively

On Tue, 24 Jun 2014, Maksym Planeta wrote:

> To clean the page cache one can use /proc/sys/vm/drop_caches. But this
> drops the whole page cache. In contrast to that sdrop_caches enables
> ability to drop the page cache selectively by path string.
> 
> Suggested-by: Thomas Knauth <thomas.knauth@....de>
> Signed-off-by: Maksym Planeta <mcsim.planeta@...il.com>

Could you include some information in the commit message about why this is 
useful?  Specifically, why you want to drop pagecache only from a specific 
path.

The name of the sysctl is also quite non-descriptive.
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