Re: 2.6.0-test4-mm1 - kswap hogs cpu OO takes ages to start!

[Andrew Morton]

Con Kolivas <kernel@xxxxxxxxxxx> wrote:
>
> On Thu, 28 Aug 2003 07:38, warudkar@xxxxxxxx wrote:
> > Trying out 2.6.0-test4-mm1. Inside KDE, I start OpenOffice.org, Rational
> > Rose and Konsole at a time. All of these take extremely long time to
> > startup. (approx > 5 minutes). Kswapd hogs the CPU all the time. X becomes
> > unusable till all of them startup, although I can telnet and run top. Same
> > thing run under 2.4.18 starts up in 3 minutes, X stays usable and kswapd
> > never take more than 2% CPU.
> 
> Yes I can reproduce this with a memory heavy load as well on low memory 
> (linking at the end of a big kernel compile is standard problem).

It could be that recent changes to page reclaim which improve I/O
scheduling have exacerbated this.

Does this make a difference?

diff -puN mm/vmscan.c~a mm/vmscan.c
--- 25/mm/vmscan.c~a	Wed Aug 27 12:51:36 2003
+++ 25-akpm/mm/vmscan.c	Wed Aug 27 12:51:48 2003
@@ -360,8 +360,6 @@ shrink_list(struct list_head *page_list,
 		 * See swapfile.c:page_queue_congested().
 		 */
 		if (PageDirty(page)) {
-			if (referenced)
-				goto keep_locked;
 			if (!is_page_cache_freeable(page))
 				goto keep_locked;
 			if (!mapping)

_

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