lkml.org 
[lkml]   [2007]   [Sep]   [14]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 14 Sep 2007 16:42:01 +0900
FromHisashi Hifumi <>
SubjectRe: [PATCH] mm: use pagevec to rotate reclaimable page
Thank you for your comment.

At 11:37 07/09/14, Andrew Morton wrote:

 >The page_count() test here is a bit of a worry, too.  Why do we need it?
 >The caller must have pinned the page in some fashion else we couldn't use
 >it safely in this function at all.
 >
 >I assume that you discovered that once we've cleared PageWriteback(), the
 >page can get reclaimed elsewhere?  If so, that could still happen
 >immediately after the page_count() test.  It's all a bit of a worry.
 >Deferring the ClearPageWriteback() will fix any race concerns, but I do
 >think that we need to take a ref on the page for the pagevec ownership.
 >

Actually, I considered taking a ref to pin pages. But this could prevent 
the page
reclaiming activity so I did not use it.

I reflect your comment and send you modified patch.

-
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: 2007-09-14 09:45    [from the cache]
©2003-2008