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Re: [PATCH 1/5] inode: Make unused inode LRU per superblock

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 1/5] inode: Make unused inode LRU per superblock
From: Nick Piggin <npiggin@xxxxxxx>
Date: Thu, 27 May 2010 02:17:33 +1000
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <1274777588-21494-2-git-send-email-david@xxxxxxxxxxxxx>
References: <1274777588-21494-1-git-send-email-david@xxxxxxxxxxxxx> <1274777588-21494-2-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Tue, May 25, 2010 at 06:53:04PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> The inode unused list is currently a global LRU. This does not match
> the other global filesystem cache - the dentry cache - which uses
> per-superblock LRU lists. Hence we have related filesystem object
> types using different LRU reclaimatin schemes.

Is this an improvement I wonder? The dcache is using per sb lists
because it specifically requires sb traversal.

What allocation/reclaim really wants (for good scalability and NUMA
characteristics) is per-zone lists for these things. It's easy to
convert a single list into per-zone lists.

It is much harder to convert per-sb lists into per-sb x per-zone lists.

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