From: Tejun Heo <tj@kernel.org>
To: Yu Kuai <yukuai3@huawei.com>
Cc: axboe@kernel.dk, cgroups@vger.kernel.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
yi.zhang@huawei.com
Subject: Re: [PATCH V2] blk-cgroup: prevent rcu_sched detected stalls warnings while iterating blkgs
Date: Wed, 7 Jul 2021 05:11:33 -1000 [thread overview]
Message-ID: <YOXEJTI7qOY6QBjy@mtj.duckdns.org> (raw)
In-Reply-To: <20210707015649.1929797-1-yukuai3@huawei.com>
On Wed, Jul 07, 2021 at 09:56:49AM +0800, Yu Kuai wrote:
> We run a test that create millions of cgroups and blkgs, and then trigger
> blkg_destroy_all(). blkg_destroy_all() will hold spin lock for a long
> time in such situation. Thus release the lock when a batch of blkgs are
> destroyed.
>
> blkcg_activate_policy() and blkcg_deactivate_policy() might have the
> same problem, however, as they are basically only called from module
> init/exit paths, let's leave them alone for now.
>
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
next prev parent reply other threads:[~2021-07-07 15:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 1:56 [PATCH V2] blk-cgroup: prevent rcu_sched detected stalls warnings while iterating blkgs Yu Kuai
2021-07-07 15:11 ` Tejun Heo [this message]
2021-07-07 15:38 ` Jens Axboe
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