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* [PATCH 0/3] memcg: Slow down swap allocation as the available space gets depleted
@ 2020-04-17  1:06 Jakub Kicinski
  2020-04-17  1:06 ` [PATCH 1/3] mm: prepare for swap over-high accounting and penalty calculation Jakub Kicinski
                   ` (3 more replies)
  0 siblings, 4 replies; 35+ messages in thread
From: Jakub Kicinski @ 2020-04-17  1:06 UTC (permalink / raw)
  To: akpm; +Cc: linux-mm, kernel-team, tj, hannes, chris, cgroups, Jakub Kicinski

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 the same 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

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

 include/linux/memcontrol.h |   4 +
 mm/memcontrol.c            | 166 ++++++++++++++++++++++++++++---------
 2 files changed, 131 insertions(+), 39 deletions(-)

-- 
2.25.2



^ permalink raw reply	[flat|nested] 35+ messages in thread

end of thread, other threads:[~2020-04-29  9:55 UTC | newest]

Thread overview: 35+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-17  1:06 [PATCH 0/3] memcg: Slow down swap allocation as the available space gets depleted Jakub Kicinski
2020-04-17  1:06 ` [PATCH 1/3] mm: prepare for swap over-high accounting and penalty calculation Jakub Kicinski
2020-04-17  1:06 ` [PATCH 2/3] mm: move penalty delay clamping out of calculate_high_delay() Jakub Kicinski
2020-04-17  1:06 ` [PATCH 3/3] mm: automatically penalize tasks with high swap use Jakub Kicinski
2020-04-17  7:37   ` Michal Hocko
2020-04-17 23:22     ` Jakub Kicinski
2020-04-17 16:11 ` [PATCH 0/3] memcg: Slow down swap allocation as the available space gets depleted Shakeel Butt
2020-04-17 16:23   ` Tejun Heo
2020-04-17 17:18     ` Shakeel Butt
2020-04-17 17:36       ` Tejun Heo
2020-04-17 17:51         ` Shakeel Butt
2020-04-17 19:35           ` Tejun Heo
2020-04-17 21:51             ` Shakeel Butt
2020-04-17 22:59               ` Tejun Heo
2020-04-20 16:12                 ` Shakeel Butt
2020-04-20 16:47                   ` Tejun Heo
2020-04-20 17:03                     ` Michal Hocko
2020-04-20 17:06                       ` Tejun Heo
2020-04-21 11:06                         ` Michal Hocko
2020-04-21 14:27                           ` Johannes Weiner
2020-04-21 16:11                             ` Michal Hocko
2020-04-21 16:56                               ` Johannes Weiner
2020-04-22 13:26                                 ` Michal Hocko
2020-04-22 14:15                                   ` Johannes Weiner
2020-04-22 15:43                                     ` Michal Hocko
2020-04-22 17:13                                       ` Johannes Weiner
2020-04-22 18:49                                         ` Michal Hocko
2020-04-23 15:00                                           ` Johannes Weiner
2020-04-24 15:05                                             ` Michal Hocko
2020-04-28 14:24                                               ` Johannes Weiner
2020-04-29  9:55                                                 ` Michal Hocko
2020-04-21 19:09                             ` Shakeel Butt
2020-04-21 21:59                               ` Johannes Weiner
2020-04-21 22:39                                 ` Shakeel Butt
2020-04-21 15:20                           ` Tejun Heo

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