linux-kernel - Re: [PATCH] block: per-cpu counters for in-flight IO accounting

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Date:	Wed, 04 Jun 2014 14:08:46 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Matias Bjørling <m@...rling.me>,
	Shaohua Li <shli@...nel.org>
CC:	"Sam Bradshaw (sbradshaw)" <sbradshaw@...ron.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block: per-cpu counters for in-flight IO accounting

On 06/04/2014 05:29 AM, Matias Bjørling wrote:
> It's in
> 
> blk_io_account_start
>   part_round_stats
>     part_round_state_single
>       part_in_flight
> 
> I like the granularity idea.

And similarly from blk_io_account_done() - which makes it even worse,
since it at both ends of the IO chain.

-- 
Jens Axboe

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