Messages in this thread | | | Date | Thu, 2 Jun 2011 12:02:16 +0100 | From | Mel Gorman <> | Subject | Re: PROBLEM: zone_reclaim is hanging high priority real time user pthreads |
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On Fri, May 27, 2011 at 01:22:42PM +0200, Bertil Engelholm wrote: > Thanx for the response. Since a few days back we have tried disabling the > zone reclaim and the system behaves much better so that seems to be the > short term solution we'll go for.
Good news.
> I also assume that if you have real time pthreads that are sensitive to > stalls you might have to disable zone reclaim also in later kernels > even though the zone reclaim implementation have been radically improved. >
It'd be one possibility. However, I understand that at least one person is considering adding an additional level of watermarks that is dependant on the number of real-time threads in the system and their expected usage. The idea would be that latency sensitive applications would be allowed to use a number of pages between two watermarks were other users would wake kswapd or enter direct reclaim. I don't know where that currently stands though.
Thanks.
-- Mel Gorman SUSE Labs
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