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    SubjectRe: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock)
    On 2011-12-19 19:27, Vivek Goyal wrote:
    > I think reverting the previous series is not going to be simple either. It
    > had 13 patches.
    >
    > https://lkml.org/lkml/2011/5/19/560
    >
    > By making stats per cpu, I was able to reduce contention on request
    > queue lock. Now we shall have to bring the lock back.

    That's not going to happen, having that lock in there was a disaster for
    small IO on fast devices. It's essentially the limiting factor on
    benchmark runs on the RHEL kernels that have it included and enabled...


    --
    Jens Axboe



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