From: Michal Hocko <mhocko@suse.com>
To: Waiman Long <longman@redhat.com>
Cc: Roman Gushchin <guro@fb.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-mm@kvack.org, Ira Weiny <ira.weiny@intel.com>,
Rafael Aquini <aquini@redhat.com>
Subject: Re: [PATCH v2 3/3] mm/page_owner: Dump memcg information
Date: Tue, 1 Feb 2022 11:49:11 +0100 [thread overview]
Message-ID: <YfkQJ4QhfY0dICB9@dhcp22.suse.cz> (raw)
In-Reply-To: <12686956-612d-d89b-5641-470d5e913090@redhat.com>
On Mon 31-01-22 13:38:28, Waiman Long wrote:
[...]
> Of course, it is also possible to have a debugfs interface to list those
> dead memcg information, displaying more information about the page that pins
> the memcg will be hard without using the page owner tool.
Yes, you will need page owner or hook into the kernel by other means
(like already mentioned drgn). The question is whether scanning all
existing pages to get that information is the best we can offer.
> Keeping track of
> the list of dead memcg's may also have some runtime overhead.
Could you be more specific? Offlined memcgs are still part of the
hierarchy IIRC. So it shouldn't be much more than iterating the whole
cgroup tree and collect interesting data about dead cgroups.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2022-02-01 10:49 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-29 20:53 [PATCH v2 0/3] mm/page_owner: Extend page_owner to show " Waiman Long
2022-01-29 20:53 ` [PATCH v2 1/3] lib/vsprintf: Avoid redundant work with 0 size Waiman Long
2022-01-30 20:49 ` David Rientjes
2022-01-30 20:57 ` Waiman Long
2022-01-31 10:25 ` Andy Shevchenko
2022-01-31 10:30 ` Andy Shevchenko
2022-01-31 10:34 ` Andy Shevchenko
2022-01-31 11:02 ` Rasmus Villemoes
2022-01-31 11:22 ` Andy Shevchenko
2022-01-31 18:48 ` Waiman Long
2022-02-01 7:12 ` Rasmus Villemoes
2022-02-01 16:01 ` Waiman Long
2022-01-31 2:53 ` Sergey Senozhatsky
2022-01-31 18:17 ` Roman Gushchin
2022-01-29 20:53 ` [PATCH v2 2/3] mm/page_owner: Use scnprintf() to avoid excessive buffer overrun check Waiman Long
2022-01-31 2:58 ` Sergey Senozhatsky
2022-01-29 20:53 ` [PATCH v2 3/3] mm/page_owner: Dump memcg information Waiman Long
2022-01-30 6:33 ` Mike Rapoport
2022-01-30 18:22 ` Waiman Long
2022-01-30 20:51 ` David Rientjes
2022-01-31 9:38 ` Michal Hocko
[not found] ` <YfgT/9tEREQNiiAN@cmpxchg.org>
2022-01-31 18:15 ` Roman Gushchin
2022-01-31 18:25 ` Michal Hocko
2022-01-31 18:38 ` Waiman Long
2022-02-01 10:49 ` Michal Hocko [this message]
2022-02-01 16:41 ` Waiman Long
2022-02-02 8:57 ` Michal Hocko
2022-02-02 15:54 ` Roman Gushchin
2022-02-02 16:38 ` Michal Hocko
2022-02-02 17:51 ` Roman Gushchin
2022-02-02 17:56 ` Michal Hocko
2022-02-02 16:29 ` Waiman Long
2022-01-31 19:01 ` Waiman Long
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