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lmkd: change default lowmem_min_oom_score for low-RAM devices 

Experiments on low-RAM devices indicate regressions due to the new low
memory kill reason which cause LMKD to kill too many processes. Change
ro.lmk.lowmem_min_oom_score to disable kills for this reason by default.

Bug: 341257415
Change-Id: Id7137c4c8d888061353b253dc6906d2854e31b1d
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan 2024-06-10 18:59:40 +00:00
parent e4d7e850a5
commit 686abc4e2b
2 changed files with 8 additions and 5 deletions
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5
README.md
View File

@ -104,8 +104,9 @@ properties:
to kill when memory is critically low. Setting it
to 1001 will prevent any kills for this reason. Min
acceptable value is 201 (apps up to perceptible).
Default = 701 (all cached apps excluding the last
active one).
Default for low-RAM devices = 1001 (disabled), for
high-end devices = 701 (all cached apps excluding
the last active one).
lmkd will set the following Android properties according to current system
configurations:

8
lmkd.cpp
View File

@ -169,6 +169,7 @@ static inline void trace_kill_end() {}
/* ro.lmk.swap_compression_ratio property defaults */
#define DEF_SWAP_COMP_RATIO 1
/* ro.lmk.lowmem_min_oom_score defaults */
#define DEF_LOWMEM_MIN_SCORE_LOWRAM (OOM_SCORE_ADJ_MAX + 1)
#define DEF_LOWMEM_MIN_SCORE (PREVIOUS_APP_ADJ + 1)
#define LMKD_REINIT_PROP "lmkd.reinit"
@ -4230,9 +4231,10 @@ static bool update_props() {
GET_LMK_PROPERTY(int64, "direct_reclaim_threshold_ms", DEF_DIRECT_RECL_THRESH_MS);
swap_compression_ratio =
GET_LMK_PROPERTY(int64, "swap_compression_ratio", DEF_SWAP_COMP_RATIO);
lowmem_min_oom_score =
std::max(PERCEPTIBLE_APP_ADJ + 1,
GET_LMK_PROPERTY(int32, "lowmem_min_oom_score", DEF_LOWMEM_MIN_SCORE));
lowmem_min_oom_score = std::max(
PERCEPTIBLE_APP_ADJ + 1,
GET_LMK_PROPERTY(int32, "lowmem_min_oom_score",
low_ram_device ? DEF_LOWMEM_MIN_SCORE_LOWRAM : DEF_LOWMEM_MIN_SCORE));
reaper.enable_debug(debug_process_killing);