aba4d2b725
Per-application memory.stat files are not available when per-application memcgs are not used (per_app_memcg=false). Disable its usage based on ro.config.per_app_memcg property. minchan: * correct indentation of memory_stat_parse * move per_app_memcg check into memory_stat_parse inside * change low_ram_device to per_app_memcg Bug: 110384555 Test: manual test to see lkmd log message with memory hogger Change-Id: Ib6dd7586d3ef1c64cb04d16e2d2b21fa9c8e6a3a Signed-off-by: Minchan Kim <minchan@google.com> Signed-off-by: Suren Baghdasaryan <surenb@google.com> |
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| .. | ||
| include | ||
| tests | ||
| Android.bp | ||
| liblmkd_utils.c | ||
| lmkd.c | ||
| lmkd.rc | ||
| OWNERS | ||
| README.md | ||
| statslog.c | ||
| statslog.h | ||
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