Re: [PATCH] scsi: fix sense_slab/bio swapping livelock

[Pekka Enberg]

Linus Torvalds wrote:
> > I suspect the right thing to do is not to mark them for "IO", but mark 
> > them for "short-lived", and allow short-lived allocations that don't 
> > have extended lifetimes to succeed even when a "real" allocation 
> > wouldn't.

Pekka Enberg wrote:
> Yeah, makes sense. We do have GFP_TEMPORARY so we could associate this 
> new semantics with that. But the real problem here is how to do the 
> "allocate harder" part which, btw, sounds very similar to what Peter's 
> kmalloc reserve patches try to do...

Actually, a trivial way to implement that is to have a few "emergency 
kmalloc" caches say for sizes 64, 128, 256, and 512 that have some 
pre-allocated pages into which these GFP_TEMPORARY allocations are 
allowed to dip into on OOM and OOM only.

		Pekka
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