We pin lmkd in memory so that we don't take page faults (and thus
requisition memory) while we're in the process of responding to a
low-memory condition. mlockall(2) is the right primitive for this
pinning. Previously, we used the MCL_FUTURE flag to mlockall: used
this way, mlockall doesn't actually pin all pages in memory, since
MCL_FUTURE affects only the default flags for future mappings and
doesn't affect mapping already in existence at the time of the
mlockall call --- like the lmkd executable itself.
This patch adds the MCL_CURRENT flag, which also pins all pages
already mapped.
Test: code inspection
Change-Id: I4563959367a2f0a9cadc3ea41731b7f311326685
Get min adj score when needed, instead to propagate from caller funct.
Bug:65642829
Test: tested on gobo_512
Change-Id: I87f15c5c6206d471002828a24d0462b0abb0d196
If the system has enough memory the pressure events are ignored or
downgraded from critical to medium.
Bug: 65642829
Test: tested on gobo
Change-Id: I44e66d2e35508aceee5c1719313db217b80d582e
For Go devices fallback to memcg/memory pressure events for LMK.
Go devices will use memcg pressure events while inkernel module
is disabled.
Bug: 64852905
Test: tested on gobo
Change-Id: I267ab00be85e324331f6c91551ba013184de817e
When close to oom the system tend to become very thrashy
and keeps paging. This change looks at the current working sent and
checks it against swap.
Test: tested on gobo
Bug: 64721547
Change-Id: I93d42def93cbc03a01a54988fd5286ec9f124e36
- Don't show misleading messages, add the correct description for
the reason of process killing
- Don't kill Launcher3 upgrade the score to perceptible (200)
- Limit the verbose logging
Test: tested on gobo
Bug: 64316273
Change-Id: Ic7c13853d939afe4f20cdaa5b488b6e1810f5ddf
By doing so different platforms can customize them accordingly.
For instance a low mem, 512MB device can do
ro.lmk.medium=400, while a device with more memory can keep
the default(800).
Test: tested on gobo.
Bug: 64316084
Change-Id: Ifc4f3853bc06f30488adb25883ccd9aaf683ba9b
Point to log/log.h where necessary, define LOG_TAG where necessary.
Accept that private/android_logger.h is suitable replacement for
log/logger.h and android/log.h.
Correct liblog/README
Effectively a cleanup and controlled select revert of
'system/core: drop or replace log/logger.h' and
'system/core: Replace log/log.h with android/log.h'.
Test: compile
Bug: 30465923
Change-Id: Ic2ad157bad6f5efe2c6af293a73bb753300b17a2
Should use android/log.h instead of log/log.h as a good example
to all others. Adjust header order to comply with Android Coding
standards.
Test: Compile
Bug: 26552300
Bug: 31289077
Change-Id: I33a8fb4e754d2dc4754d335660c450e0a67190fc
android_get_control_socket has a warning from the implicit cast from
long to int. The warning was being hidden because cutils/sockets.h was
included with -isystem. Move android_get_control_socket to sockets.cpp,
since we don't want header only dependencies anyways, and fix the
warning with a range check and a static_cast.
Bug: 31492149
Test: m -j <module that uses sockets.h and -Wall>
Change-Id: I1f394ab26d4ec8a7dd0e7907c10416d7f8647624
This will make sure we get invoked in time,
and combined with a kernel change to increase
the window size (and thus rate-limit the
notifications) based on the amount of memory
on the device, this should provide a nice
balance between receiving too many notifications
vs getting notified too late.
Change-Id: I2f5e92390b94e582aaa06d88763a232e39673496
Add the following mount options to the /proc filesystem:
hidepid=2,gid=3009
This change blocks /proc access unless you're in group 3009
(aka AID_READPROC).
Please see
https://github.com/torvalds/linux/blob/master/Documentation/filesystems/proc.txt
for documentation on the hidepid option.
hidepid=2 is preferred over hidepid=1 since it leaks less information
and doesn't generate SELinux ptrace denials when trying to access
/proc without being in the proper group.
Add AID_READPROC to processes which need to access /proc entries for
other UIDs.
Bug: 23310674
Change-Id: I22bb55ff7b80ff722945e224845215196f09dafa
Opening /proc/zoneinfo may return -ENOMEM under memory pressure,
assume something needs to be killed if that happens.
Bug: 16236289
Change-Id: I25aab09f4c3f2b9e176eaaeca94fd6bd790dad4e
The task selected to die may be small, add its approximate size
to other_free and other_file and keep killing until all thresholds
are met.
Bug: 16236289
Change-Id: Iceeca4c63fec98cae2bf53e258f7707cea408b07
If kswapd runs more than lmkd it may throw away all page cache pages
before lmkd gets a chance to kill a process. Make lmkd SCHED_FIFO
so it can react quickly to kernel low memory notifications.
Bug: 16236289
Change-Id: I46767b4ec81ef8638d0c9e47d168a68b62e3cac5
Use mlockall(MCL_FUTURE) to lock all lmkd pages in memory. This
avoids lmkd thrashing when the system is low on memory.
As a side effect, it will also keep the .text sections of liblog, libm,
libc, and libprocessgroup in memory at all times.
Bug: 16236289
Change-Id: Idd70557efa4b1e14bc86f14220672a30f6c956e3
While lmkd does technically use libcutils' socket.h, it only
uses a static inline. Remove libcutils from LOCAL_SHARED_LIBRARIES
so it doesn't end up mlock'd in memory in the next patch.
Bug: 16236289
Change-Id: I744d69bfff06cb904836f64e1d5f6e530604bff4
After sending sigkill to the main process, also call into
libprocessgroup to kill any processes that were forked.
Bug: 15313911
Change-Id: I05577c6f5b70800ce0a01f480c8870c2c601afda
Statically linked binaries cannot take advantage of ASLR,
making them less secure.
In addition, statically linked binaries consume more ram,
because shared libraries cannot be reused.
executable size before: 87728
executable size after: 13656
Change-Id: I9d02d865f9beeaaaadcd5009f64ac015931d4b11
Use oom_score_adj for setting OOM score adjustment values instead
of the older, deprecated oom_adj interface.
Change-Id: I5ba7801d4b8971be092b31ae0fd8af8c3001d613
Move kernel low memory killer logic to new daemon lmkd. ActivityManager
communicates with this daemon over a named socket.
Change-Id: Ie957da7e9b1f7150e23c689fdadf23ff260b47be
