Re: [patch -mm 4/5] mm: test and set zone reclaim lock before starting reclaim

[Christoph Lameter <clameter@sgi.com>]

On Tue, 25 Sep 2007, David Rientjes wrote:

> On Tue, 25 Sep 2007, Christoph Lameter wrote:
> 
> > > > One thing that has been changed in -mm with regard to my last patchset is 
> > > > that kswapd and try_to_free_pages() are allowed to call shrink_zone() 
> > > > concurrently.
> > > > 
> > > 
> > > Aah.. interesting. Could you define concurrently more precisely,
> > > concurrently as in the same zone or for different zones concurrently?
> > 
> > There was no change. They were allowed to call shrink_zone concurrently 
> > before.
> > 
> 
> Yes, there was.  Before the patchset, zone reclaim would not be able to 
> call shrink_zone() on a zone that it is already being invoked for, 
> regardless of where it was previous invoked from.  Now it is.

Right. I just wanted to make sure of this. The statement above 
seems to indicate that there was a change to the concurrency of kswapd 
and try_to_free_pages with one another.




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