Re: VM patches in 2.6.4-rc1-mm2

[Nick Piggin]

Mike Fedyk wrote:

> Nick Piggin wrote:
>
> > Mike Fedyk wrote:
> >
> > > Nick Piggin wrote:
> > >
> > > > Mainline doesn't put enough pressure on slab with highmem systems. 
> > > > This
> > > > creates a lot more ZONE_NORMAL pressure and that causes swapping.
> > >
> > > Yep, saw that.  Especially with 128MB Highmem (eg, 1G RAM)
> > >
> > > > Now with the 2.6 VM, you don't do any mapped memory scaning at all
> > >
> > >
> > >
> > >
> > > You mean 2.6-mm?
> >
> > Yes, either mm or linus.
>
> Have there been any VM patches merged into mainline?  Or are you 
> saying that the imbalance in mainline would be enough to overcome to 
> lack of scanning of mapped pages?

There have been no VM patches merged into mainline. I just mean that
neither mm or mainline does any mapped memory scanning when memory
pressure is low.

> > If you get a lot of pressure at one time it should push out your
> > inactive mapped pages. Will get most of the really inactive ones,
> > but it won't help pages becoming inactive in future.
>
> Ok, I see.  This might be happening, since it is steadily getting more 
> into swap.


For the one that is swapping, yes this would be happening.


> > Hasn't looked at it much. Probably not until some of the more basic
> > VM patches can get merged into -linus.
>
>
> Yes, I wonder if the VM patches helped -mm in the reaim tests...
>
> Let's get the fsfaz (free slab for all zones) into mainline asap! :-D


Well all the ones in -mm now are probably right to go to 2.6.5
I hope.

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