Re: high overhead of functions blkg_*stats_* in bfq

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Hello,

On Mon, Nov 06, 2017 at 05:26:38PM +0100, Paolo Valente wrote:
> Yes.  DEBUG_BLK_CGROUP will just serve to keep the for-debugging
> subset switched off even when the dynamic parameter is on.
> 
> We'll wait for possible counter-arguments from Tejun, and then start
> to work on what you propose.

So, I think the only *really* required ones are io_serviced and the
corresponding byte counts, which are tracked by blk-cgroup core
anyway.  Everything else can be hidden behind an obviously debug boot
param, say, bfq.__DEBUG__extra_stats or whatever.

Thanks.

-- 
tejun



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