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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

  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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