linux-kernel - Re: [PATCH v3] blk-cgroup: Replace u64 sync with spinlock for iostat update

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Message-ID: <ZpgUAJn-ypO-0JZg@slm.duckdns.org>
Date: Wed, 17 Jul 2024 08:57:04 -1000
From: "tj@...nel.org" <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Boy Wu (吳勃誼) <Boy.Wu@...iatek.com>,
	"boris@....io" <boris@....io>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	Iverlin Wang (王苳霖) <Iverlin.Wang@...iatek.com>,
	"josef@...icpanda.com" <josef@...icpanda.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"angelogioacchino.delregno@...labora.com" <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v3] blk-cgroup: Replace u64 sync with spinlock for iostat
 update

On Wed, Jul 17, 2024 at 02:55:37PM -0400, Waiman Long wrote:
> I was wrong about __blkcg_rstat_flush(). Right, the main updater of
> iostat_cpu is  blk_cgroup_bio_start(). We do need to drop down some comment
> on what is protected by u64_sync and what is by blkg_stat_lock though. It
> can be confusing.

Oh yeah, definitely. It is confusing.

-- 
tejun