Re: [PATCH v10 12/35] shrinker: add node awareness

[Andrew Morton <akpm@linux-foundation.org>]

On Thu, 6 Jun 2013 13:26:59 +1000 Dave Chinner <david@fromorbit.com> wrote:

> On Wed, Jun 05, 2013 at 04:08:10PM -0700, Andrew Morton wrote:
> > On Mon,  3 Jun 2013 23:29:41 +0400 Glauber Costa <glommer@openvz.org> wrote:
> > 
> > > From: Dave Chinner <dchinner@redhat.com>
> > > 
> > > Pass the node of the current zone being reclaimed to shrink_slab(),
> > > allowing the shrinker control nodemask to be set appropriately for
> > > node aware shrinkers.
> > 
> > Again, some musings on node hotplug would be interesting.
> > 
> > > --- a/drivers/staging/android/ashmem.c
> > > +++ b/drivers/staging/android/ashmem.c
> > > @@ -692,6 +692,9 @@ static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> > >  				.gfp_mask = GFP_KERNEL,
> > >  				.nr_to_scan = 0,
> > >  			};
> > > +
> > > +			nodes_setall(sc.nodes_to_scan);
> > 
> > hm, is there some way to do this within the initializer? ie:
> > 
> > 				.nodes_to_scan = magic_goes_here(),
> 
> Nothing obvious - it's essentially a memset call, so I'm not sure
> how that could be put in the initialiser...

I was thinking something like

		.nodes_to_scan = node_online_map,

which would solve both problems.  But node_online_map is nowhere near
the appropriate type, ho-hum.

We could newly accumulate such a thing in register_one_node(), but I
don't see a need.


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