Re: 2.6.10: kswapd spins like crazy

[Nick Piggin <nickpiggin@yahoo.com.au>]

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Nick Piggin wrote:

> Hmm, your DMA zone has no active pages, and pages_scanned (which 
> triggers all_unreclaimable)
> is only incremented when scanning the active list. But I wonder, if the 
> pages can't be
> freed, why aren't they being put on the active list?

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

[-- Attachment #2: vmscan-minfix.patch --]
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---

 linux-2.6-npiggin/mm/vmscan.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN mm/vmscan.c~vmscan-minfix mm/vmscan.c
--- 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)

_