staging: android: lowmemorykiller: select a new task to kill

Under certain circumstances, a process may take time to handle a SIGKILL.
When lowmemkiller is called again shortly after, it would pick the same
process to kill over and over, so that we cann't get free memory for long time.

Solution is to check fatal_signal_pending() on the selected task, and if it's
already pending, select a new task to kill.

Cherry-pick 5e3358093351e5d48e21250e31896b855542f22c
Reviewed-on: http://gerrit.pcs.mot.com/479831

Change-Id: I53445114451ffaba293f3c7174fb0b01ed0d34b6
Signed-off-by: Tianshui Shi <kfp634@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/505410
Tested-by: Jira Key <JIRAKEY@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Reviewed-by: Jason Hrycay <jason.hrycay@motorola.com>
Reviewed-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
(cherry picked from commit da093001caf06ed2296b4f79c84cc48ce713eac6)
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
trace: memkill: trace LMK and OOM kills

How to enable tracer:

  # mount -t debugfs nodev /sys/kernel/debug
  # echo 1 > /sys/kernel/debug/tracing/tracing_on
  # echo 1 > /sys/kernel/debug/tracing/events/memkill/enable
  # cat /sys/kernel/debug/tracing/trace

Event format:

  oom_kill: <pid> <comm> <total_vm> <anon_rss> <file_rss> <oom_score_adj> <order> <points> <cached> <freeswap>
  oom_kill_shared: <pid> <comm>
  lmk_kill: <pid> <comm> <selected_oom_adj> <selected_tasksize> <min_adj> <cached> <freeswap>

Change-Id: Ic45e181c62aead9b19d2a40363217f9220896096
Signed-off-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/480746
Reviewed-on: http://gerrit.pcs.mot.com/513174
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Jason Hrycay <jason.hrycay@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Thirumarai Selvi S <a16462@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Christopher Fries <qcf001@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
(cherry picked from commit ef733ddfbb73cd33daf36720fa474ce4c8acb1f7)
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
trace: allow memkill tracing to be selectively enabled

Change-Id: I8a50d6b121192b0dc94e2a9a0e05246a47045e81
Signed-off-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/482673
Reviewed-on: http://gerrit.pcs.mot.com/513906
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Thirumarai Selvi S <a16462@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
(cherry picked from commit fd9bd32cd8f005b0d2f6438935fdd0bc9654c938)
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
trace: memkill: per-zone page state for LMK

LMK considers memory status per zone. This change appends
gfp mask and per-zone free/file page state to LMK kill tracing.
A field <Node_id>:<Zone_id>:<Nr_free>:<Nr_page> is printed for
each zone.

Change-Id: I9627e5f486b1c32217c7d701fdaa7d05671c006b
Signed-off-by: Yuanyuan Zhong <a6510c@motorola.com>
(cherry picked from commit 2e59bf04b7634d3a9e28d088cb103f8d5fc18504)
Signed-off-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
trace: memkill: provide fixed zone info columns.

Maintain kernel trace log to always have fixed number of columns.

propagated_from: (CR)

Signed-off-by: Yi-wei Zhao <gbjc64@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/537078
SLT-Approved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: David Ding <dding@motorola.com>
Reviewed-by: Dong-Dong Yang <gdb746@motorola.com>
Reviewed-by: Jeff Thompson <jthomps1@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
(cherry picked from commit 8ac598bee92a14659b58f6ebaae4b3179fcc7e01)

Change-Id: I3e4ab2d5499a0f008b55bf3210fb40e234abc4a3
Reviewed-on: http://gerrit.pcs.mot.com/548484
SLT-Approved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Jason Hrycay <jason.hrycay@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
staging: android: lowmemorykiller: implement task's adj rbtree

Based on the current LMK implementation, LMK has to scan all processes to
select the correct task to kill during low memory.
The basic idea for the optimization is to :
queue all tasks with oom_score_adj priority, and then LMK just selects the
proper task from the queue(rbtree) to kill.

performance improvement:
the current implementation: average time to find a task to kill : 1004us
the optimized implementation: average time to find a task to kill: 43us

Change-Id: I4dbbdd5673314dbbdabb71c3eff0dc229ce4ea91
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/548917
SLT-Approved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
staging: android: lmk: check free memory when tasks switch to background

Add more free-memory check point.
This patch trigger low memory killer to scan free memory when a process is moved
to background task groups.

Change-Id: If50eef2fb2c05f57ab808f95a9408204058f4f9b
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/557973
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
SLTApproved: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
staging: android: lmk: skip if killed by lmk

A task can be selected to kill when it's already exiting. Sending
signal to the task at that state won't set TIF_SIGPENDING for it.
After that, every task including threads in the exiting task itself
running into lmk will compete for the mutex, then spend some time
waiting for the exiting task to release memory or try to send signal
to the same task again.
We want the exiting task to exit as early as possible but it's slowed
down greatly by the mutex and waiting. Skip lmk if current thread
group leader is exiting and is killed by lmk. Also delegate TIF_MEMDIE
to current task.

Change-Id: Id7839b81f183165871976666bfd4e04130a00610
Signed-off-by: Yuanyuan Zhong <zyy@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/584015
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Russell Knize <rknize@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
staging: android: lmk: check TIF directly

When trying to fix that lmk can't kill an exiting task
(commit 895304e926352e0272964a421bd6271e47616ab3
(CR) staging: android: lmk: skip if killed by lmk),
additional check was added for the TIF_MEMDIE flag.
However the task lock has already been taken when examining
the task. The same helper function which tries to grab the
task lock again will be deadlocked.
Change to check the thread flag of thread group leader directly.

Change-Id: If1f880aaca2f053a54ab38c62f275f0a714eb5d2
Signed-off-by: Yuanyuan Zhong <zyy@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/587751
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
sched,cgroup: Fix up task_groups list

With multiple instances of task_groups, for_each_rt_rq() is a noop,
no task groups having been added to the rt.c list instance.  This
renders __enable/disable_runtime() and print_rt_stats() noop, the
user (non) visible effect being that rt task groups are missing in
/proc/sched_debug.

Change-Id: Ib337ebda0e752f838d787c03fe1b0a8f03ea0551
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: stable@kernel.org # v3.3+
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1344308413.6846.7.camel@marge.simpson.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Git-commit: 35cf4e50b16331def6cfcbee11e49270b6db07f5
Git-repo: git://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoC: msm: qdsp6v2: Wait for stream to be available in gapless playback

Compressed driver operates on two streams in gapless mode and switches
between the two streams. If compressed playback operates on larger
buffers and the clip being played is small enough to fit in one
buffer, the driver could run into a scenario where three streams
need to be handled. Three streams results in no audio because stream
switching logic is corrupted. Fix is to block the next track call if
stream one has not completed playback.

CRs-Fixed: 594977
Change-Id: I6c83e859fa38f177ec7f4fa4ea92937d34df933a
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoC: msm: qdsp6v2: check if backend active before querying RMS

RMS query to dsp should be done only when the relevant back end is
active to avoid un-necessary errors. Put a check to see if the
backend is active.

CRs-Fixed: 597886
Change-Id: I1ed402272eb34aa6120adbb97d1627a3f7f9b3c5
Signed-off-by: Jitendra Singh Naruka <jnaruk@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoC: Compress: Remove unused hw_params pointer

Remove the hw_params variable in
soc_compr_set_params_fe as the memory allocated
for it was not freed and the pointer itself was
not used.

CRs-Fixed: 601556
Change-Id: If2abfe58ad6dedab9b7ba21ae6f3b4bb5335cf42
Signed-off-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoC: msm: Condition change to feed buffer on resume

Feed data to the DSP on a CMD_RUN ack by looking at the number
of bytes sent to the DSP and not the number of bytes consumed

Change-Id: I45a670d244e20dd1f444a92b86737b7541a7ccf0
Signed-off-by: Haynes Mathew George <hgeorge@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoC: msm: qdsp6v2: ASM changes to use stream id as token parameter

Gapless compressed offload playback operates on two streams.
Platform driver needs to know the stream for which the command
callback is recieved. Use the token parameter in apr header to
pass the stream for ASM commands for which DSP expects stream and
session.

Change-Id: Ibd8f5b6a52f57ccf8cc7eea15eb460b2f9796120
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ASoc: msm: qdsp6v2: Fix for NULL check

- Required check added for NULL pointer

CRs-fixed: 583939
Change-Id: I8b079c42ef06af9a817dc830c5f2d3c785232aa7
Signed-off-by: Mingming Yin <mingming@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
block: do not notify urgent request, when flush with data in flight

MMC device driver implements URGENT request execution with priority
(using stop flow), as a result currently running (and prepared) request
may be reinserted back into I/O scheduler. This will break block layer
logic of flushes (flush request should not be inserted into I/O scheduler).

Block layer flush machinery keep q->flush_data_in_flight list updated with
started but not completed flush requests with data (REQ_FUA).

This change will not notify underling block device driver about pending
urgent request during flushes in flight.

Change-Id: I8b654925a3c989250fcb8f4f7c998795fb203923
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
mmc: queue: do not clean current request when urgent in progress

As a result of following fix: "mmc: core: do not reinsert prepeared
FUA and FLUSH requests in stop flow" REQ_FUA and REQ_FLUSH requests
are not reinserted back into i/o scheduler, but instead started request
execution.

This change will prevent cleaning current request pointer for such
requests.

Change-Id: I25f8706954fb538be62182c87d5fb20354696b7a
CRs-fixed: 600127
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
sched: convert WARN_ON() to printk_sched() in try_to_wake_up_local()

try_to_wake_up_local() is called with the rq lock held. Printing to
console in this context can result in a deadlock if klogd needs to
be woken up. Print to the kernel log buffer via printk_sched()
instead which avoids the wakeup.

Change-Id: Ia07baea3cb7e0b158545207fdbbb866203256d3c
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
Signed-off-by: Dan Trifan <jimsth@gmail.com>