Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

[Rik van Riel]

On Tue, 19 Feb 2008 17:34:59 +1100
Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:

> On Tuesday 19 February 2008 16:44, KOSAKI Motohiro wrote:
> > background
> > ========================================
> > current VM implementation doesn't has limit of # of parallel reclaim.
> > when heavy workload, it bring to 2 bad things
> >   - heavy lock contention
> >   - unnecessary swap out

> I think it should maybe be a per-zone thing...
> 
> What happens if you make it a per-zone mutex, and allow just a single
> process to reclaim pages from a given zone at a time? I guess that is
> going to slow down throughput a little bit in some cases though...

I agree, doing things per zone will probably work better, because
that way one process can do page reclaim on every NUMA node at
the same time.

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