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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.
    > 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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      Last update: 2011-12-20 13:51    [W:8.419 / U:0.304 seconds]
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