Re: NUMA API for Linux

[Hugh Dickins]

On Wed, 7 Apr 2004, Andrew Morton wrote:
> 
> Your patch takes the CONFIG_NUMA vma from 64 bytes to 68.  It would be nice
> to pull those 4 bytes back somehow.

How significant is this vma size issue?

anon_vma objrmap will add 20 bytes to each vma (on 32-bit arches):
8 for prio_tree, 12 for anon_vma linkage in vma,
sometimes another 12 for the anon_vma head itself.

anonmm objrmap adds just the 8 bytes for prio_tree,
remaining overhead 28 bytes per mm.

Seems hard on Andi to begrudge him 4.

Hugh

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