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    SubjectRe: [PATCH] Reduce vm_stat cacheline contention in __vm_enough_memory
    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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      Last update: 2011-10-13 23:05    [W:0.019 / U:8.920 seconds]
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