Re: [RFC] memory defragmentation to satisfy high order allocations

Hi, Marcelo.

> > > > > That is, if we can't migrate the page, try to write it out?
> > > 
> > > I just didnt understand the logic very well, maybe I should just 
> > > go reread the code.
> > > 
> > > Thanks!
> 
> I'm thinking about how to implement a nonblocking version of generic_migrate_page().
> 
> For this purpose its really bad to allocate swap space to anonymous pages, well
> need to figure out someother way of blocking the users via pagetablefault.
> 
> Like a "virtual" swap space but without allocating swap map space. 

I've also ever thought to implement such a device.
It would be nice if you can design it simple.

Mr.Iwamoto thought otherwise and posted another opinion on the lhms
list, though. I felt it also has a point.

iwamoto> I don't think requiring swap is a big deal.  If you don't have a
iwamoto> dedicated swap device, which case I think unusual, you can swapon a
iwamoto> regular file.

Thanks,
Hirokazu Takahashi.
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