Re: [PATCH 1/2] mm: page allocator: Adjust the per-cpu counterthreshold when memory is low

[Kyle McMartin]

On Wed, Oct 27, 2010 at 09:47:35AM +0100, Mel Gorman wrote:
><snip>
> To ensure that kswapd wakes up, a safe version of zone_watermark_ok()
> is introduced that takes a more accurate reading of NR_FREE_PAGES when
> called from wakeup_kswapd, when deciding whether it is really safe to go
> back to sleep in sleeping_prematurely() and when deciding if a zone is
> really balanced or not in balance_pgdat(). We are still using an expensive
> function but limiting how often it is called.
><snip>
> Reported-by: Shaohua Li <shaohua.li@xxxxxxxxx>
> Signed-off-by: Mel Gorman <mel@xxxxxxxxx>

Hi Mel,

I notice these aren't flagged for stable, should they be? (They fairly
trivially apply and compile on 2.6.36 barring the trace_ points which
changed.) I've got a few bug reports against .36/.37 where kswapd has
been sleeping for 60s+.

I built them some kernels with these patches, but haven't heard back yet
as to whether it fixes things for them.

Thanks for any insight,
	Kyle
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