Enable new kill strategy when PSI mode is used in combination with
ro.lmk.use_minfree_levels=false. Adjust ro.lmk.swap_free_low_percentage,
introduce ro.lmk.psi_partial_stall_ms and ro.lmk.psi_complete_stall_ms
system properties to support two levels of PSI events measuring partial
and complete stalls. Add ro.lmk.use_new_strategy system property to switch
to the old strategy if necessary.
Bug: 132642304
Test: lmkd_unit_test, ACT memory pressure tests
Change-Id: I6f1b65e19dbe9b58c862e5e4255270c82f0afb9a
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Add new kill strategy which makes kill decisions based on which zone
watermark is breached, how much free swap space is still available and
what percentage of the file-backed page cache has been refaulted. This mode
is designed to be used only with PSI signals. It kills unconditionally when
a critical pressure event is received, therefore PSI stall for that event
should be set to a value representing a truly non-responding system
(currently set to 700ms out of 1sec spent in complete stall). New event
handler also controls polling interval based on current memory conditions.
Bug: 132642304
Test: lmkd_unit_test, ACT memory pressure tests
Change-Id: Ia213ef2bb06b245d651ebf2d813e944b4ae7565f
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Add ability to switch to the algorithm used by lowmemorykiller driver
for determining when to kill. It uses minfree levels to decide at which
levels of free memory and file cache to kill a process. oom_adj_score
is also determined by comparing current memory resources against minfree
levels.
ro.lmk.use_minfree_levels property is introduces for switching into this
mode. By default it is disabled.
Bug: 77299493
Bug: 75322373
Merged-In: I6b51972951026854a079fcda33d6786b7ed035e4
Change-Id: I6b51972951026854a079fcda33d6786b7ed035e4
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suren Baghdasaryan