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From: Jakub Kicinski <kuba@kernel.org>
To: akpm@linux-foundation.org
Cc: linux-mm@kvack.org, kernel-team@fb.com, tj@kernel.org,
	hannes@cmpxchg.org, chris@chrisdown.name,
	cgroups@vger.kernel.org, shakeelb@google.com, mhocko@kernel.org,
	Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH mm v2 0/3] memcg: Slow down swap allocation as the available space gets depleted
Date: Mon, 11 May 2020 15:55:13 -0700
Message-ID: <20200511225516.2431921-1-kuba@kernel.org> (raw)

Tejun describes the problem as follows:

When swap runs out, there's an abrupt change in system behavior -
the anonymous memory suddenly becomes unmanageable which readily
breaks any sort of memory isolation and can bring down the whole
system. To avoid that, oomd [1] monitors free swap space and triggers
kills when it drops below the specific threshold (e.g. 15%).

While this works, it's far from ideal:
 - Depending on IO performance and total swap size, a given
   headroom might not be enough or too much.
 - oomd has to monitor swap depletion in addition to the usual
   pressure metrics and it currently doesn't consider memory.swap.max.

Solve this by adapting parts of the approach that memory.high uses -
slow down allocation as the resource gets depleted turning the
depletion behavior from abrupt cliff one to gradual degradation
observable through memory pressure metric.

[1] https://github.com/facebookincubator/oomd

v1: https://lore.kernel.org/linux-mm/20200417010617.927266-1-kuba@kernel.org/

Jakub Kicinski (3):
  mm: prepare for swap over-high accounting and penalty calculation
  mm: move penalty delay clamping out of calculate_high_delay()
  mm: automatically penalize tasks with high swap use

 Documentation/admin-guide/cgroup-v2.rst |  16 +++
 include/linux/memcontrol.h              |   4 +
 mm/memcontrol.c                         | 166 ++++++++++++++++++------
 3 files changed, 147 insertions(+), 39 deletions(-)

-- 
2.25.4



             reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 22:55 Jakub Kicinski [this message]
2020-05-11 22:55 ` [PATCH mm v2 1/3] mm: prepare for swap over-high accounting and penalty calculation Jakub Kicinski
2020-05-12  7:08   ` Michal Hocko
2020-05-12 17:28     ` Jakub Kicinski
2020-05-13  8:06       ` Michal Hocko
2020-05-11 22:55 ` [PATCH mm v2 2/3] mm: move penalty delay clamping out of calculate_high_delay() Jakub Kicinski
2020-05-11 22:55 ` [PATCH mm v2 3/3] mm: automatically penalize tasks with high swap use Jakub Kicinski
2020-05-12  7:26   ` Michal Hocko
2020-05-12 17:55     ` Jakub Kicinski
2020-05-13  8:32       ` Michal Hocko
2020-05-13 18:36         ` Jakub Kicinski
2020-05-14  7:42           ` Michal Hocko
2020-05-14 20:21             ` Johannes Weiner
2020-05-15  7:14               ` Michal Hocko
2020-05-13  8:38   ` Michal Hocko

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