Re: 2.6.10: kswapd spins like crazy

From: Nick Piggin
Date: Thu Feb 03 2005 - 20:35:30 EST



Andrew Morton wrote:
Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:

Oh, attached should be a minimal fix if you would like to try it out.


...
--- linux-2.6/mm/vmscan.c~vmscan-minfix 2005-02-04 11:52:37.000000000 +1100
+++ linux-2.6-npiggin/mm/vmscan.c 2005-02-04 11:53:32.000000000 +1100
@@ -575,6 +575,7 @@ static void shrink_cache(struct zone *zo
nr_taken++;
}
zone->nr_inactive -= nr_taken;
+ zone->pages_scanned += nr_scan;
spin_unlock_irq(&zone->lru_lock);

if (nr_taken == 0)



Any theories as to why these pages aren't being activated and aren't being
reclaimed?



No none yet, which is what we should get to the bottom of. I must be
overlooking something, but the only ways I can see should be due to
transient conditions like page locked or under writeback. laptop_mode?

Terje, what is /proc/sys/vm/laptop_mode set to?

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