When system is under heavy memory pressure the system might be able
to keep free memory above the min watermark avoiding perceptible app
kills. In such situation system might end up using all its cpu
capacity on memory reclaim and not doing productive work. To detect
this condition, check memory full stall and compare it with the new
ro.lmk.stall_limit_critical tunable representing the stall threshold.
When the recorded level is over ro.lmk.stall_limit_critical, lmkd will
be allowed to kill perceptible apps. ro.lmk.stall_limit_critical
represents the max memory full stall in % that is allowed before
perceptible apps will get killed. By default it is set to 100%, which
effectively disables the feature.
Currently system stall is measured based on psi memory stall 10s average
value, however this definition might change in the future if better
metrics are developed. Setting ro.lmk.stall_limit_critical to 5 means
the system should be fully stalled (no productive work is done) for 5%
of the 10sec period, resulting in 0.5 sec loss due to the stall.
Bug: 205182133
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I9713e30d82641d86d1b7edb5e1ba2971b935c898
Added SPDX-license-identifier-Apache-2.0 to:
Android.bp
libpsi/Android.bp
tests/Android.bp
Bug: 68860345
Bug: 151177513
Bug: 151953481
Test: m all
Exempt-From-Owner-Approval: janitorial work
Change-Id: I5fed190764c763388c50c2fea58c5c421579bd30
Make vendor_available = true so that other modules in vendor image
can leverage this library to init, register and unregister to psi.
Bug: 169346507
Change-Id: I47f7d25984e09d61703e7b2bd6fcb8db9d3814f5
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
The libpsi source code is missing cutils and stdio header files.
Add cutils and stdio header files, and add libcutils_headers to
the header library in Android.bp.
Bug: 169346507
Change-Id: I2d613d5724d3c5f52dd52dcae7024439f2e8d5bb
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
These were transitively included, but no longer are, so they must be
explicitly included.
Exempt-From-Owner-Approval: Janitorial
Test: build
Change-Id: Ic0896401d148b22f33d6edb1fac377208e437565
This was transitively included, but no longer is, so it must be
explicitly included.
Exempt-From-Owner-Approval: Janitorial
Test: build
Change-Id: I89657fa33df4bc0f92685012b3ab9b24d55d1619
New library to create, register and destroy PSI monitors in a consistent
way with lmkd.
Test: used within lmkd
Bug: 111308141
Change-Id: If243a97f178e90fe41e2de90c7b858ba82440279
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suren Baghdasaryan
Bob Badour
Sudarshan Rajagopalan
Tom Cherry
Tim Murray