Re: 2.4.23aa2 (bugfixes and important VM improvements for the high end)

[Andi Kleen]

Andrea Arcangeli <andrea@xxxxxxx> writes:
> 
> we can add a config option to enable together with 2.5:1.5 to drop the
> gap page in vmalloc, and to reduce the vmalloc space, so that we can
> sneak another few "free" dozen megs back for the 64G kernel just to get
> more margin even if we don't strictly need it. (btw, the vmalloc space
> is also tunable at boot, so this config option would just change the
> default value)

Not sure if that would help, but you could relatively easily save
8 bytes on 32bit for each vma too. Replace vm_next with rb_next()
and move vm_rb.color into vm_flags. It would be a lot of editing
work though. NUMA API will add new 4 bytes again. 

-Andi
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