[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-mm
Subject:    Re: Kernel 2.6.8.1: swap storm of death - nr_requests > 1024 on
From:       Andrew Morton <akpm () osdl ! org>
Date:       2004-08-29 22:28:20
Message-ID: 20040829152820.715d137d.akpm () osdl ! org
[Download RAW message or body]

William Lee Irwin III <wli@holomorphy.com> wrote:
>
>  On Sun, Aug 29, 2004 at 01:59:17PM -0700, Andrew Morton wrote:
>  > The changlog wasn't that detailed ;)
>  > But yes, it's the large nr_requests which is tripping up swapout.  I'm
>  > assuming that when a process exits with its anonymous memory still under
>  > swap I/O we're forgetting to actually free the pages when the I/O
>  > completes.  So we end up with a ton of zero-ref swapcache pages on the LRU.
>  > I assume.   Something odd's happening, that's for sure.
> 
>  Maybe we need to be checking for this in end_swap_bio_write() or
>  rotate_reclaimable_page()?

Maybe.  I thought a get_page() in swap_writepage() and a put_page() in
end_swap_bio_write() would cause the page to be freed.  But not.  It needs
some actual real work done on it.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>
[prev in list] [next in list] [prev in thread] [next in thread]