linux-kernel - Re: [PATCH 04/13] mm: new shrinker API

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Message-ID: <20110823092330.GY3162@dastard>
Date:	Tue, 23 Aug 2011 19:23:30 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, khlebnikov@...nvz.org
Subject: Re: [PATCH 04/13] mm: new shrinker API

On Tue, Aug 23, 2011 at 05:15:29AM -0400, Christoph Hellwig wrote:
> >  /*
> >   * A callback you can register to apply pressure to ageable caches.
> 
> It's much more than just a single callback these days.
> 
> > + * @scan_objects will be made from the current reclaim context.
> >   */
> >  struct shrinker {
> >  	int (*shrink)(struct shrinker *, struct shrink_control *sc);
> > +	long (*count_objects)(struct shrinker *, struct shrink_control *sc);
> > +	long (*scan_objects)(struct shrinker *, struct shrink_control *sc);
> 
> Is shrink_object really such a good name for this method?

Apart from the fact it is called "scan_objects", I'm open to more
appropriate names. I called is "scan_objects" because of the fact we
are asking to scan (rather than free) a specific number objects on
the LRU, and it matches with the "sc->nr_to_scan" control field.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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