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Date: Mon, 17 Mar 2003 12:23:57 -0800
From: Andrew Morton <akpm@digeo.com>
To: Matthew Wilcox <willy@debian.org>
Cc: bzzz@tmi.comex.ru, willy@debian.org, adilger@clusterfs.com,
       linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net
Subject: Re: [Ext2-devel] [PATCH] distributed counters for ext2 to avoid
 group scaning
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Matthew Wilcox <willy@debian.org> wrote:
>
> Anyway, I think dcounters should probably be allocated from kmalloc_percpu()
> rather than as part of the dcounter struct.

That will still consume up to 4 kilobytes per 32-bit counter.  We'd
need to merge Kiran & Dipankar's interlace allocator to do this less
grossly.

Which is why I'm waiting to see some profiles and benchmarks.  Judging from
the last set of profiles, in which ext2_count_free_blocks() was not present,
this may not be justified.

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