Re: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock)
From: Jens Axboe <axboe@kernel.dk>
Date: 2011-12-20 12:49:30
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lkml
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