Re: [PATCH 1/1] mm: Prevent dereferencing non-allocated per_cpuvariables

[Christoph Lameter]

On Wed, 28 Nov 2007, Andi Kleen wrote:

> It was demonstrated useful for some specific cases, like context switch early
> fetch on IA64. But I agree the prefetch on each list_for_each() is probably
> a bad idea and should be removed. Will also help code size.

Looks like sum_vm_events() is only ever called from all_vm_events(). 
Callers of all_vm_events():

App monitoring?
arch/s390/appldata/appldata_mem.c:      all_vm_events(ev);

Leds:
drivers/parisc/led.c:   all_vm_events(events);

proc out put for /proc/vmstat:
mm/vmstat.c:    all_vm_events(e);

All of that does not seem to be performance critical 
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