From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy()
Date: Wed, 31 Oct 2012 14:27:25 -0700 [thread overview]
Message-ID: <20121031212725.GA2945@htj.dyndns.org> (raw)
In-Reply-To: <20121031212359.GC5286-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
Hey, Michal.
On Wed, Oct 31, 2012 at 10:23:59PM +0100, Michal Hocko wrote:
> > + for_each_subsys(cgrp->root, ss)
> > + if (ss->pre_destroy)
> > + WARN_ON_ONCE(ss->pre_destroy(cgrp));
>
> Do you think that BUG_ON would be too harsh?
Yeah, I do think so. In general, I think the consensus now is to
prefer WARN_ON[_ONCE]() over BUG_ON() whenever possible. It's not
like we can get more information from BUG_ON()s (more likely to get
less reporting actually by taking down the machine). Limping machines
are better than dead ones and there just isn't much to gain here by
killing it.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-10-31 21:27 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-31 19:44 [PATCHSET RESEND v2] cgroup: simplify cgroup removal path Tejun Heo
2012-10-31 19:44 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
[not found] ` <1351712650-23709-5-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 21:23 ` Michal Hocko
[not found] ` <20121031212359.GC5286-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-10-31 21:27 ` Tejun Heo [this message]
[not found] ` <20121031212725.GA2945-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2012-11-01 8:58 ` Michal Hocko
2012-11-02 10:05 ` Kamezawa Hiroyuki
2012-11-05 5:37 ` Li Zefan
[not found] ` <1351712650-23709-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 19:44 ` [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs Tejun Heo
[not found] ` <1351712650-23709-2-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 20:08 ` Michal Hocko
[not found] ` <20121031200859.GE1271-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-10-31 20:11 ` Tejun Heo
[not found] ` <CAOS58YPbYoMJ1+3uRfK_ZERyZoaby=FPW7uTpp8dVOSgYC8Mrw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-31 20:14 ` Michal Hocko
[not found] ` <20121031201415.GG1271-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-10-31 20:24 ` Tejun Heo
[not found] ` <20121031202400.GT2945-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2012-10-31 20:49 ` Michal Hocko
2012-11-02 10:01 ` Kamezawa Hiroyuki
2012-10-31 20:12 ` Michal Hocko
[not found] ` <20121031201227.GF1271-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-10-31 20:14 ` Tejun Heo
[not found] ` <CAOS58YOHjLyKFeah+h+qOrAWvfi1O5eL7m-AMbqAdcP=EOFb6g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-31 21:23 ` Michal Hocko
2012-11-05 5:34 ` Li Zefan
2012-10-31 19:44 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
[not found] ` <1351712650-23709-3-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-11-02 10:02 ` Kamezawa Hiroyuki
2012-11-05 5:33 ` Li Zefan
2012-10-31 19:44 ` [PATCH 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create() Tejun Heo
[not found] ` <1351712650-23709-4-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-11-02 10:03 ` Kamezawa Hiroyuki
2012-11-05 5:36 ` Li Zefan
2012-10-31 19:44 ` [PATCH 5/8] cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir() and cgroup_release_and_wakeup_rmdir() Tejun Heo
[not found] ` <1351712650-23709-6-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-11-02 10:20 ` Kamezawa Hiroyuki
2012-11-05 5:40 ` Li Zefan
2012-10-31 19:44 ` [PATCH 6/8] memcg: make mem_cgroup_reparent_charges non failing Tejun Heo
[not found] ` <1351712650-23709-7-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-11-02 10:21 ` Kamezawa Hiroyuki
2012-10-31 19:44 ` [PATCH 7/8] hugetlb: do not fail in hugetlb_cgroup_pre_destroy Tejun Heo
[not found] ` <1351712650-23709-8-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-11-02 10:23 ` Kamezawa Hiroyuki
2012-11-05 17:30 ` [PATCHSET RESEND v2] cgroup: simplify cgroup removal path Tejun Heo
[not found] ` <20121105173024.GA19354-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2012-11-05 18:39 ` Michal Hocko
2012-10-31 19:44 ` [PATCH 8/8] cgroup: make ->pre_destroy() return void Tejun Heo
[not found] ` <1351712650-23709-9-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 21:23 ` Michal Hocko
2012-11-02 10:24 ` Kamezawa Hiroyuki
2012-11-05 5:41 ` Li Zefan
-- strict thread matches above, loose matches on Subject: below --
2012-10-31 18:16 [PATCHSET v2] cgroup: simplify cgroup removal path Tejun Heo
[not found] ` <1351707391-22287-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 18:16 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
2012-10-31 4:22 [PATCHSET] cgroup: simplify cgroup removal path Tejun Heo
[not found] ` <1351657365-25055-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 4:22 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
[not found] ` <1351657365-25055-5-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2012-10-31 13:42 ` Glauber Costa
2012-10-31 16:05 ` Michal Hocko
2012-11-02 9:43 ` Kamezawa Hiroyuki
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