linux-kernel - Re: [RFC 8/8] Reduce inode memory usage for systems with a high MAX

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Message-ID: <6599ad830701161152q75ff29cdo7306c9b8df5c351b@mail.gmail.com>
Date:	Tue, 16 Jan 2007 11:52:13 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	"Nick Piggin" <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	"Andi Kleen" <ak@...e.de>, "Paul Jackson" <pj@....com>,
	"Dave Chinner" <dgc@....com>
Subject: Re: [RFC 8/8] Reduce inode memory usage for systems with a high MAX_NUMNODES

On 1/15/07, Christoph Lameter <clameter@....com> wrote:
>
> This solution may be a bit hokey. I tried other approaches but this
> one seemed to be the simplest with the least complications. Maybe someone
> else can come up with a better solution?

How about a 64-bit field in struct inode that's used as a bitmask if
there are no more than 64 nodes, and a pointer to a bitmask if there
are more than 64 nodes. The filesystems wouldn't need to be involved
then, as the bitmap allocation could be done in the generic code.

Paul
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