Re: writeback list

[Rik van Riel <riel@conectiva.com.br>]

On Thu, 13 Jul 2000, Rajagopal Ananthanarayanan wrote:
> Rik van Riel wrote:

> > we may have forgotten something in our new new vm design from
> > last weekend. While we have the list head available to put
> > pages in the writeback list, we don't have an entry in to put
> > the timestamp of the write in struct_page...
> > 
> > Maybe we want to have an active list after all and replace the
> > buffer_head pointer with a pointer to another structure that
> > tracks the writeback stuff that's now tracked by the buffer head?
> > 
> > (things like: prev, next, write_time and a few other things)
> 
> Yes, maintaining time information in the page will be useful for
> XFS also. Basically, there are pages in the page cache without a
> particular block(s) assigned to the page ... these are the
> delayed allocate pages. Such pages don't have any buffer_heads
> associated with them, until the delalloc is converted.

Exactly, this is what the write-back list will be used for.

> It will be great if the delalloc pages can be somehow temporally
> ordered. The write-back list you propose seems to fit the bill
> nicely.

To put it more strongly, the write-back list *needs* to be
temporally ordered if we want to have a kupdate like we have
today.

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

http://www.conectiva.com/		http://www.surriel.com/

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