Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

[Dave Hansen]

On Wed, 2005-11-02 at 13:00 +0100, Ingo Molnar wrote:
> 
> >  Yeah - and that isn't what is being proposed here.  The goal is to 
> >  ask the kernel to identify some memory which can be legitimately 
> >  freed and hasten the freeing of that memory.
> 
> but that's very easy to identify: check the free list or the clean 
> list(s). No defragmentation necessary. [unless the unit of RAM mapping 
> between hypervisor and guest is too coarse (i.e. not 4K pages).]

It needs to be that coarse in cases where HugeTLB is desired for use.
I'm not sure I could convince the DB guys to give up large pages,
they're pretty hooked on them. ;)

-- Dave

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