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From: Tejun Heo <tj@kernel.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: axboe@kernel.dk, linux-kernel@vger.kernel.org,
	cgroups@vger.kernel.org, avanzini.arianna@gmail.com,
	kernel-team@fb.com
Subject: Re: [PATCH 2/6] blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it
Date: Fri, 26 Jun 2015 09:55:44 -0400	[thread overview]
Message-ID: <20150626135544.GC15805@mtj.duckdns.org> (raw)
In-Reply-To: <20150626134525.GB14803@redhat.com>

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

  reply	other threads:[~2015-06-26 13:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-25 21:38 [PATCHSET block/for-4.2/writeback] blkcg: blkcg stats cleanup Tejun Heo
2015-06-25 21:38 ` [PATCH 1/6] cgroup: make cftype->private a unsigned long Tejun Heo
2015-06-30  6:50   ` Zefan Li
2015-06-25 21:38 ` [PATCH 2/6] blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it Tejun Heo
2015-06-26 13:27   ` Vivek Goyal
2015-06-26 13:35     ` Tejun Heo
2015-06-26 13:45       ` Vivek Goyal
2015-06-26 13:55         ` Tejun Heo [this message]
2015-06-25 21:38 ` [PATCH 3/6] blkcg: make blkcg_[rw]stat per-cpu Tejun Heo
2015-06-25 21:38 ` [PATCH 4/6] blkcg: make blkg_[rw]stat_recursive_sum() to be able to index into blkcg_gq Tejun Heo
2015-06-25 21:38 ` [PATCH 5/6] blkcg: move io_service_bytes and io_serviced stats " Tejun Heo
2015-06-26 16:01   ` Vivek Goyal
2015-06-26 16:09     ` Tejun Heo
2015-06-25 21:38 ` [PATCH 6/6] blkcg: remove cfqg_stats->sectors Tejun Heo

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