linux-ext4 - Re: booked-page-flag.patch

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Message-ID: <m3k5yj49bw.fsf@bzzz.home.net>
Date:	Thu, 15 Feb 2007 20:30:43 +0300
From:	Alex Tomas <alex@...sterfs.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>, Alex Tomas <alex@...sterfs.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: booked-page-flag.patch

>>>>> Eric Sandeen (ES) writes:

 ES> Andrew Morton wrote:
 >> Sorry, we're seriously, seriously, seriously short on flags in the page
 >> struct and this patch is going to need one heck of a good case for it to be
 >> acceptable.

 ES> This was for the delayed allocation patchset, right; and by managing
 ES> this at the page level that means we can't do this for block size <
 ES> page size, I think...

I still think that having PG_booked and special code to handle
case when blocksize==pagesize is worthwhile -- we save 56 bytes
on 32bit and 104 bytes on 64bit for every written page.

thanks, Alex
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