linux-kernel - Re: [PATCH 1/2] mm: add context argument to shrinker callback

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Date:	Thu, 22 Apr 2010 12:42:47 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] mm: add context argument to shrinker callback

On Fri, Apr 23, 2010 at 02:38:01AM +1000, Nick Piggin wrote:
> I don't understand, it should be implemented like just all the other
> shrinkers AFAIKS. Like the dcache one that has to shrink multiple
> superblocks. There is absolutely no requirement for this API change
> to implement it in XFS.

The dcache shrinker is an example for a complete mess.

> But the shrinker list *is* a global list. The downside of it in the way
> it was done in the XFS patch is that 1) it is much larger than a simple
> list head, and 2) not usable by anything other then the shrinker.

It is an existing global list just made more useful.  Whenever a driver
has muliple instances of pool that need shrinking this comes in useful,
it's not related to filesystems at all. 

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