[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 7 Jul 2021 05:11:33 -1000
From: Tejun Heo <tj@...nel.org>
To: Yu Kuai <yukuai3@...wei.com>
Cc: axboe@...nel.dk, cgroups@...r.kernel.org,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
yi.zhang@...wei.com
Subject: Re: [PATCH V2] blk-cgroup: prevent rcu_sched detected stalls
warnings while iterating blkgs
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@...wei.com>
Acked-by: Tejun Heo <tj@...nel.org>
Thanks.
--
tejun
Powered by blists - more mailing lists