From: Tejun Heo <tj@kernel.org>
To: "Michal Koutný" <mkoutny@suse.com>
Cc: Jan Kara <jack@suse.cz>, Paolo Valente <paolo.valente@linaro.org>,
linux-block@vger.kernel.org, fvogdt@suse.de,
cgroups@vger.kernel.org
Subject: Re: Use after free with BFQ and cgroups
Date: Mon, 29 Nov 2021 07:12:42 -1000 [thread overview]
Message-ID: <YaUKCoK39FlZK9m5@slm.duckdns.org> (raw)
In-Reply-To: <20211126144724.GA31093@blackbody.suse.cz>
On Fri, Nov 26, 2021 at 03:47:24PM +0100, Michal Koutný wrote:
> The question here is how long would stay the offlined blkcgs around if
> they were directly pinned upon the IO submission. If it's unbound, then
> reparenting makes more sense.
It should be fine to pin whatever's necessary while related IOs are in
flight and percpu_ref used for css refcnting isn't gonna make any noticeable
difference in terms of overhead.
Thanks.
--
tejun
next prev parent reply other threads:[~2021-11-29 20:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 17:28 Use after free with BFQ and cgroups Jan Kara
2021-11-26 14:47 ` Michal Koutný
2021-11-29 17:11 ` Jan Kara
2021-12-09 2:23 ` yukuai (C)
2021-12-09 15:33 ` Paolo Valente
2021-12-13 17:33 ` Jan Kara
2021-12-14 1:24 ` yukuai (C)
2021-12-20 18:38 ` Jan Kara
2021-12-22 15:21 ` Jan Kara
2021-12-23 1:02 ` yukuai (C)
2021-12-23 17:13 ` Jan Kara
2021-11-29 17:12 ` Tejun Heo [this message]
2021-11-30 11:50 ` Jan Kara
2021-11-30 16:22 ` Tejun Heo
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