Messages in this thread | | | Date | Tue, 14 Aug 2007 23:44:30 +0200 | From | Andi Kleen <> | Subject | Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c |
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On Tue, Aug 14, 2007 at 02:37:27PM -0700, Christoph Lameter wrote: > On Tue, 14 Aug 2007, Andi Kleen wrote: > > > > We already have such a flag in the zone structure > > > > Zone structure is not strictly CPU local so it's broader > > than needed. But it might work. > > We could convert this into a per cpu array?
Perhaps. That would make it more expensive to read for its current users though.
> But that still creates lots of overhead each time we take the lru lock!
A lot of overhead in what way? Setting a flag in a cache hot per CPU data variable shouldn't be more than a few cycles.
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