Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable() checks

[Tejun Heo]

On Thu, Oct 22, 2015 at 05:06:23PM +0200, Michal Hocko wrote:
> Do I get it right that if vmstat_update has its own workqueue with
> WQ_MEM_RECLAIM then there is a _guarantee_ that the rescuer will always
> be able to process vmstat_update work from the requested CPU?

Yeah.

> That should be sufficient because vmstat_update doesn't sleep on
> allocation. I agree that this would be a more appropriate fix.

The problem seems to be reclaim path busy looping waiting for
vmstat_update and workqueue thinking that the work item must be making
forward-progress and thus not starting the next work item.

Thanks.

-- 
tejun
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