Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

[Peter Zijlstra]

On Mon, Aug 19, 2013 at 01:10:26PM +0200, Peter Zijlstra wrote:
> So no, if we need per-cpu iowait time we have to do A.
> 
> Since we already have atomics in the io_schedule*() paths, please
> replace those with (seq)locks. Also see if you can place the entire
> iowait accounting thing in a separate cacheline.

Also, it completely blows to have these extra atomics in the IO paths,
I'm sure that the Mega-IOP/s people would be much pleased if we could
remove these.


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