lkml.org 
[lkml]   [2007]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch] agp: don't lock pages
On Thu, Jul 26, 2007 at 11:44:22AM +1000, Dave Airlie wrote:
> >
> >Yeah I had a bit of a look around, and it seems OK (but would
> >appreciate an ack from someone who knows the code).
> >
> >These pages will never get seen by page reclaim, so we're OK
> >there. There is a get_page before the SetPageLocked and a put_page
> >right before the unlock_page, so refcounting should not be broken
> >if it wasn't already: note that the lock_page doesn't pin a
> >reference on a page in general -- we can use it as such for pagecache
> >(although it isn't very clean), because the lock pins the page in
> >pagecache and the pagecache holds a ref.
> >
> >Anyway, if Dave or David can take a look, that would be appreciated.
> >We'll need this for 2.6.23.
>
> I talked with Ben earlier and I can't see anything inherently wrong
> with removing the lock_page, I assume it was put there to stop things
> getting swapped but if the get/put does that then I'd be happy to
> remove it.

Well it is prevented from being swapped out because it never gets
put on swapout lists, but the get/put certainly doesn't hurt :)


> I'm just a bit confused how this didn't get picked up in -mm at all.

Beats me. It was in there for nearly 5 months. Mustn't have been
tested or reported.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-26 04:09    [W:0.059 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site