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Jim Blackler 3947c938a7 Allow memory metrics on devices that use kernel LMK 
Bug: 130017100
Test: Tested manually
Change-Id: I37f6edb71decc1260bd521595842508926fa86aa
 		2019-04-29 11:02:51 +00:00
..
include Make inlines static 2019-02-06 15:19:00 -08:00
libpsi libpsi: initial revision 2019-01-30 04:47:28 +00:00
tests lmkd: add missing libcutils library to test 2019-01-15 14:14:20 -08:00
Android.bp lmkd: Add support for psi monitors 2019-02-01 18:40:32 +00:00
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
event.logtags lmkd: Fix meminfo logs missing SwapTotal and having wrong field order 2019-03-25 11:04:11 -07:00
liblmkd_utils.c lmkd: Introduce liblmkd_utils for communicating with lmkd process 2018-03-09 11:18:53 -08:00
lmkd.c Allow memory metrics on devices that use kernel LMK 2019-04-29 11:02:51 +00:00
lmkd.rc lmkd: limit capability set to minimum 2018-04-16 14:51:56 -07:00
statslog.c Add min_score_adj into LmkKillOccurred event 2019-03-05 09:51:06 +00:00
statslog.h Add min_score_adj into LmkKillOccurred event 2019-03-05 09:51:06 +00:00

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