Re: [patch 2] mm: speculative get_page

[Pavel Machek]

Hi!

> > > > I think there are a a few ways that bits can be reclaimed if we
> > > > start digging. swsusp uses 2 which seems excessive though may be
> > > > fully justified. 
> > > 
> > > They (swsusp) actually don't need the bits at all until suspend-time, at
> > > all.  Somebody coded up a "dynamic page flags" patch that let them kill
> > > the page->flags use, but it didn't really go anywhere.  Might be nice if
> > > someone dug it up.  I probably have a copy somewhere.
> > 
> > Unfortunately that patch was rather ugly :-(.
> 
> Do you think the idea was ugly, or just the implementation?  Is there
> something that you'd rather see?

Well, implementation was ugly and idea was unneccesary because we
still had bits left.

We could spare bits for swsusp by defining "PageReserved | PageLocked
=> PageNosave" etc.... simply by choosing some otherwise unused
combinations. swsusp is not performance critical...
								Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.
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