Re: writeback list

[Rajagopal Ananthanarayanan <ananth@sgi.com>]

Rik van Riel wrote:
> 
> Hi Stephen,
> 
> 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.

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.

regards,

ananth.


-- 
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Rajagopal Ananthanarayanan ("ananth")
Member Technical Staff, SGI.
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