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

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Date:	Thu, 15 Feb 2007 12:56:54 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alex Tomas <alex@...sterfs.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, "Theodore Ts'o" <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: booked-page-flag.patch

On Thu, 15 Feb 2007 20:30:43 +0300 Alex Tomas <alex@...sterfs.com> wrote:

> >>>>> 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.
> 

If the page doesn't have buffer-heads, set PG_private and clear page->private

If the page does have buffer_heads, use BH_Delay.


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