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

[Vivek Goyal]

On Thu, Jun 25, 2015 at 05:38:53PM -0400, Tejun Heo wrote:

[..]
> It's planned that the core stats will be moved to blkcg_gq, so we want
> to move the mechanism for keeping track of the stats of dead children
> from cfq to blkcg core.  This patch adds blkg_[rw]stat->aux_cnt which
> are atomic64_t's keeping track of auxiliary counts which are excluded
> when reading local counts but included for recursive.

Hi Tejun,

So aux_cnt is atomic64_t as updation is not the hot path hence there is
not much value in keeping it as per cpu?

Thanks
Vivek
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