Messages in this thread | | | Date | Thu, 13 Oct 2011 16:02:58 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: [PATCH] Reduce vm_stat cacheline contention in __vm_enough_memory |
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On Thu, 13 Oct 2011, Andrew Morton wrote:
> > If there are no updates occurring for a while (due to increased deltas > > and/or vmstat updates) then the vm_stat cacheline should be able to stay > > in shared mode in multiple processors and the performance should increase. > > > > We could cacheline align vm_stat[]. But the thing is pretty small - we > couild put each entry in its own cacheline.
Which in turn would increase the cache footprint of some key kernel functions (because they need multiple vm_stat entries) and cause eviction of other cachelines that then reduce overall system performance again.
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