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

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Message-ID: <1403703004.20275.21.camel@sauron.fi.intel.com>
Date:	Wed, 25 Jun 2014 16:30:04 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Thomas Knauth <thomas.knauth@....de>
Cc:	David Rientjes <rientjes@...gle.com>,
	Maksym Planeta <mcsim.planeta@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysctl: Add a feature to drop caches selectively

On Wed, 2014-06-25 at 15:23 +0200, Thomas Knauth wrote:
> On Wed, Jun 25, 2014 at 11:56 AM, Artem Bityutskiy <dedekind1@...il.com> wrote:
> > Thanks for the answer, although you forgot to comment on the question
> > about possibly extending the new interface to work with file ranges in
> > the future. For example, I have a 2 TiB file, and I am only interested
> > in dropping caches for the first couple of gigabytes. Would I extend
> > your interface, or would I come up with another one?
> 
> Ah, didn't quite understand what was meant with file ranges. Again, we
> had not considered this so far. I guess you could make a distinction
> between directories and files here. If the path points to a file, you
> can have an optional argument indicating the range of bytes you would
> like to drop. Something like
> 
> echo "my-file 0-1000,8000-1000" > /proc/sys/vm/sdrop_cache
> 
> If this is desirable, we can add it to the patch.

No, I do not ask to implement this, just trying to understand how the
interface could possibly be extended.

-- 
Best Regards,
Artem Bityutskiy

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