[PATCH 0/3] memcg: Slow down swap allocation as the available space gets depleted

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]     [Monitors]

  Powered by Linux