Date: Fri, 11 Jun 2004 16:18:48 -0700
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Andrew Morton <akpm@osdl.org>
cc: dhowells@redhat.com, torvalds@osdl.org, linux-kernel@vger.kernel.org,
       apw@shadowen.org
Subject: Re: [PATCH] Permit inode & dentry hash tables to be allocated > MAX_ORDER size
Message-ID: <3067490000.1086995928@flay>
In-Reply-To: <20040611161920.0a40e49d.akpm@osdl.org>
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--On Friday, June 11, 2004 16:19:20 -0700 Andrew Morton <akpm@osdl.org> wrote:

> "Martin J. Bligh" <mbligh@aracnet.com> wrote:
>> 
>> We've hit a problem with alignment issues where the start of the zone is
>> aligned to 16MB, for instance, and the max grouping is now 256MB. That
>> generatates a "warning: wrong zone alignment: it will crash" error (or
>> something similar). Andy sent me a patch this morning to throw away
>> the lower section, which is much nicer than crashing ... but I'd prefer
>> not to throw that RAM away unless we have to. 
> 
> Confused.  Why do we have that test in there at all?  We should just toss
> the pages one at a time into the buddy list and let the normal coalescing
> work it out.  That way we'd end up with a single 16MB "page" followed by N
> 256MB "pages".

That's what I thought ... Andy looked at it more than I did, but I think
he's asleep, unfortunately. IIRC, he said the buddy stuff keys off 
zone_start_pfn though. Maybe that's fixable ...

M.

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