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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
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