Messages in this thread | | | Date | Mon, 10 Mar 2008 17:19:32 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: quicklists confuse meminfo |
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On Mon, 10 Mar 2008, Andi Kleen wrote: > Christoph Lameter <clameter@sgi.com> writes: > > > > Zeroed pages however will not address the issue of having initialized pgd > > (which seems to be what i386 needs). > > pgd is tiny on i386 PAE (4 * 16 bytes). Are you sure reinitializing that > is a serious issue? ...
It used to be tiny (32 aligned bytes), then 2.6.22's quicklist enlarged that to a whole (lowmem) page. I think we were all too busy with other stuff to protest loudly enough about that bloat.
If the quicklists are going, it'd be good for PAE to go back to a kmem_cache of 32-byte entries as in 2.6.21 - I think Ingo's patch is still using a whole page there.
Or have sl?b alignment changes, or virtualization issues (locking per underlying struct page?), made a kmem_cache awkward there now?
Hugh
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