Re: [PATCH 2/6] blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it

[Tejun Heo]

On Fri, Jun 26, 2015 at 09:45:25AM -0400, Vivek Goyal wrote:
> I was just curious that why aux_cnt is different from rest of the stats.
> (It is atomic64_t while others are not).

Ooh because otherwise we'd have to protect it with sth - a spinlock,
u64 stat sync thing or whatever.  It's just a lot simpler and more
robust to use atomics.

Thanks.

-- 
tejun
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