Re: [PATCH v2] slab,slub: ignore __GFP_WAIT if we're booting orsuspending

[Pavel Machek]

Hi!

> > Academic for boot, probably real for suspend/resume. There the atomic
> > reserves could matter because the memory can be pretty full when you
> > start suspend.
> 
> Right, that might be something to look into, though we haven't yet
> applied the technique for suspend & resume. My main issue with it at the
> moment is how do I synchronize with allocations that are already
> sleeping when changing the gfp flag mask without bloating the normal

Well, but the problem already exists, no? If someone is already
sleeping due to __GFP_WAIT, he'll probably sleep till the resume.

...well, if he's sleeping in the disk driver, I suspect driver will
finish outstanding requests as part of .suspend().

> I also suspect that we might want to try to make -some- amount of free
> space before starting suspend, though of course not nearly as
> aggressively as with std.

We free 4MB in 2.6.30, but Rafael is removing that for 2.6.31 :-(.

									Pavel
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