linux-kernel - Re: [PATCH 0/8] Avoiding fragmentation with subzone groupings v25

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Message-Id: <20060907175848.63379fe1.akpm@osdl.org>
Date:	Thu, 7 Sep 2006 17:58:48 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] Avoiding fragmentation with subzone groupings v25

On Thu,  7 Sep 2006 20:03:42 +0100 (IST)
Mel Gorman <mel@....ul.ie> wrote:

> When a page is allocated, the page-flags
> are updated with a value indicating it's type of reclaimability so that it
> is placed on the correct list on free.

We're getting awful tight on page-flags.

Would it be possible to avoid adding the flag?  Say, have a per-zone bitmap
of size (zone->present_pages/(1<<MAX_ORDER)) bits, then do a lookup in
there to work out whether a particular page is within a MAX_ORDER clump of
easy-reclaimable pages?
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