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8 commits

Author SHA1 Message Date
Anita Zhang cb5ce676d9 oomd: check mem free and swap free before doing a swap-based kill 
https://bugzilla.redhat.com/show_bug.cgi?id=1974763
 2021-06-30 03:51:05 -07:00
Anita Zhang 685b0985f0 oomd: threshold swap kill candidates to usages of more than 5% 
In some instances, particularly with swap on zram, swap used will be high
while there is still a lot of memory available. FB OOMD handles this by
thresholding kills to X% of total swap usage. Let's do the same thing here.

Anecdotally with these thresholds and my laptop which is exclusively swap
on zram I can sit at 0K / 4G swap free with most of memory free and
systemd-oomd doesn't kill anything.

Partially addresses aggressive kill behavior from
https://bugzilla.redhat.com/show_bug.cgi?id=1941170
 2021-04-05 02:04:49 -07:00
Anita Zhang a858355e4a oomd: force DefaultMemoryPressureDurationSec= to be greater than or equal 1 sec 2021-04-01 19:53:42 -07:00
Lennart Poettering d06e7fb532 oomd: increase accuracy of SwapUsedLimit= to permyriads too 
oomd.conf has two parameters with fractionals: SwapUsedLimit= and
DefaultMemoryPressureLimit=, but one accepts permyriads, the other only
percentages, for no apparent reason. One carries the "Percent" in the
name, the other doesn't.

Let's clean this up: always accept permyriads, and drop the suffix,
given that it is misleading.

I figure we should internally try to focus on scaling everything
relative to UINT32_MAX, and if that isn't in the cards at least 10000,
but never permille nor percent unless there's a really really good
reason for it (e.g. interface defined by someone else).
 2021-02-18 22:40:47 +01:00
Anita Zhang 0a9f93443b oom: rework *MemoryPressureLimit= properties to have 1/10000 precision 
Requested in
https://github.com/systemd/systemd/pull/15206#discussion_r505506657,
preserve the full granularity for memory pressure limits (permyriad)
instead of capping out at percent.
 2021-02-02 17:52:48 -08:00
Anita Zhang c20aa7b171 oom: make memory pressure duration configurable through oomd.conf 2021-01-24 01:59:03 -08:00
Yu Watanabe db9ecf0501 license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
Anita Zhang cf3e57884e man: document systemd-oomd and related items 2020-10-09 02:40:19 -07:00