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

To: Nick Piggin <npiggin@xxxxxxx>
Subject: Re: [PATCH 1/2] mm: add context argument to shrinker callback
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 22 Apr 2010 12:42:47 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20100422163801.GZ5683@laptop>
References: <1271118255-21070-1-git-send-email-david@xxxxxxxxxxxxx> <1271118255-21070-2-git-send-email-david@xxxxxxxxxxxxx> <20100418001514.GA26575@xxxxxxxxxxxxx> <20100419140039.GQ5683@laptop> <20100420004149.GA14744@dastard> <20100420083840.GR5683@laptop> <20100420103216.GK15130@dastard> <20100421084004.GS5683@laptop> <20100422163211.GA2478@xxxxxxxxxxxxx> <20100422163801.GZ5683@laptop>
User-agent: Mutt/1.5.19 (2009-01-05)
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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