From: Michal Hocko <mhocko@suse.com>
To: Nico Pache <npache@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Rafael Aquini <aquini@redhat.com>,
Waiman Long <longman@redhat.com>, Baoquan He <bhe@redhat.com>,
Christoph von Recklinghausen <crecklin@redhat.com>,
Don Dutile <ddutile@redhat.com>,
"Herton R . Krzesinski" <herton@redhat.com>,
David Rientjes <rientjes@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Ingo Molnar <mingo@redhat.com>, Joel Savitz <jsavitz@redhat.com>,
Darren Hart <dvhart@infradead.org>,
stable@kernel.org
Subject: Re: [PATCH v8] oom_kill.c: futex: Don't OOM reap the VMA containing the robust_list_head
Date: Fri, 8 Apr 2022 11:36:36 +0200 [thread overview]
Message-ID: <YlACJMp7AFaVa/Gt@dhcp22.suse.cz> (raw)
In-Reply-To: <ddf1755e-fe69-b60e-ee07-e78d663b11b2@redhat.com>
On Fri 08-04-22 04:52:33, Nico Pache wrote:
[...]
> In a heavily contended CPU with high memory pressure the delay may also
> lead to other processes unnecessarily OOMing.
Let me just comment on this part because there is likely a confusion
inlved. Delaying the oom_reaper _cannot_ lead to additional OOM killing
because the the oom killing is throttled by existence of a preexisting
OOM victim. In other words as long as there is an alive victim no
further victims are not selected and the oom killer backs off. The
oom_repaer will hide the alive oom victim after it is processed.
The longer the delay will be the longer an oom victim can block a
further progress but it cannot really cause unnecessary OOMing.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2022-04-08 9:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-08 3:28 [PATCH v8] oom_kill.c: futex: Don't OOM reap the VMA containing the robust_list_head Nico Pache
2022-04-08 8:15 ` Peter Zijlstra
2022-04-08 8:37 ` Thomas Gleixner
2022-04-08 8:52 ` Nico Pache
2022-04-08 9:36 ` Michal Hocko [this message]
2022-04-08 9:40 ` Nico Pache
2022-04-08 9:59 ` Michal Hocko
2022-04-08 10:36 ` Nico Pache
2022-04-08 10:51 ` Michal Hocko
2022-04-08 11:26 ` Nico Pache
2022-04-08 11:48 ` Michal Hocko
2022-04-08 8:41 ` Nico Pache
2022-04-08 13:54 ` Thomas Gleixner
2022-04-08 16:13 ` Joel Savitz
2022-04-08 21:41 ` Thomas Gleixner
2022-04-11 6:48 ` Michal Hocko
2022-04-11 7:47 ` Thomas Gleixner
2022-04-11 9:08 ` Michal Hocko
2022-04-12 0:02 ` Nico Pache
2022-04-13 16:00 ` Nico Pache
2022-04-11 23:51 ` Nico Pache
2022-04-12 16:20 ` Thomas Gleixner
2022-04-12 17:03 ` Nico Pache
2022-04-08 14:41 ` kernel test robot
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