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SubjectRe: upcoming item: get_page_from_freelist
On Thu, Jun 25, 2009 at 04:37:43PM -0400, Theodore Tso wrote:
> Nicely spotted. Yeah, that's a bug; we need to do something about
> that one, too. And what we're doing is a bit silly; it may make sense
> to use __get_free_pages if filesystem blocksize == PAGE_SIZE, but
> otherwise we should be using a sub-page allocator. Right now, we're
> chewing up a 16k PPC page for every 4k filesystem metadata page
> allocated in journal_write_metadata_buffer(), and on x86, for the
> (admittedly uncommon) 1k block filesystem, we'd be chewing up a 4k
> page for a 1k block buffer.
> Both of these problems exist for both ext3 and ext4.

And ocfs2.



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"Reread your favorite book."

Joel Becker
Principal Software Developer
Phone: (650) 506-8127

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