tequilaOS/platform_system_core
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
platform_system_core/lmkd
History
Suren Baghdasaryan 1d1c002c3d lmkd: Skip memory.stat usage when per-app memcgs are not used 
Initial change to remove memory.stat usage when per-application memcgs
are disabled was partially merged into AOSP under the following id:
Ib6dd7586d3ef1c64cb04d16e2d2b21fa9c8e6a3a
This change adds the missing parts.

Bug: 110384555
Change-Id: I1265021b1ede0e68efbf80d6430a959eaf46a69a
Merged-In: Ib6dd7586d3ef1c64cb04d16e2d2b21fa9c8e6a3a
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
2018-08-08 01:18:38 +00:00
..
include lmkd: Introduce liblmkd_utils for communicating with lmkd process 2018-03-09 11:18:53 -08:00
tests Merge "lmkd: test: access /sys/module/lowmemorykiller/ as u:r:shell:s0" am: b69cb7071d 2018-04-05 19:45:16 -07:00
Android.bp Fix the stats log in lmkd 2018-05-04 13:40:47 -07:00
liblmkd_utils.c lmkd: Introduce liblmkd_utils for communicating with lmkd process 2018-03-09 11:18:53 -08:00
lmkd.c lmkd: Skip memory.stat usage when per-app memcgs are not used 2018-08-08 01:18:38 +00:00
lmkd.rc lmkd: limit capability set to minimum 2018-04-16 14:51:56 -07:00
OWNERS Add lmkd/OWNERS. 2017-12-08 16:12:58 -08:00
README.md lmkd: Introduce support for legacy kill algorithm that uses minfree levels 2018-04-17 01:42:06 +00:00
statslog.c Fix the stats log in lmkd 2018-05-03 16:04:27 -07:00
statslog.h Fix the stats log in lmkd 2018-05-03 16:04:27 -07:00

README.md

Android Low Memory Killer Daemon

Introduction

Android Low Memory Killer Daemon (lmkd) is a process monitoring memory state of a running Android system and reacting to high memory pressure by killing the least essential process(es) to keep system performing at acceptable levels.

Background

Historically on Android systems memory monitoring and killing of non-essential processes was handled by a kernel lowmemorykiller driver. Since Linux Kernel 4.12 the lowmemorykiller driver has been removed and instead userspace lmkd daemon performs these tasks.

Android Properties

lmkd can be configured on a particular system using the following Android properties:

ro.config.low_ram: choose between low-memory vs high-performance device. Default = false.

ro.lmk.use_minfree_levels: use free memory and file cache thresholds for making decisions when to kill. This mode works the same way kernel lowmemorykiller driver used to work. Default = false

ro.lmk.low: min oom_adj score for processes eligible to be killed at low vmpressure level. Default = 1001 (disabled)

ro.lmk.medium: min oom_adj score for processes eligible to be killed at medium vmpressure level. Default = 800 (non-essential processes)

ro.lmk.critical: min oom_adj score for processes eligible to be killed at critical vmpressure level. Default = 0 (all processes)

ro.lmk.critical_upgrade: enables upgrade to critical level. Default = false

ro.lmk.upgrade_pressure: max mem_pressure at which level will be upgraded because system is swapping too much. Default = 100 (disabled)

ro.lmk.downgrade_pressure: min mem_pressure at which vmpressure event will be ignored because enough free memory is still available. Default = 100 (disabled)

ro.lmk.kill_heaviest_task: kill heaviest eligible task (best decision) vs. any eligible task (fast decision). Default = false

ro.lmk.kill_timeout_ms: duration in ms after a kill when no additional kill will be done, Default = 0 (disabled)

ro.lmk.debug: enable lmkd debug logs, Default = false