fix build with updated battery drivers
defconfig: update HTC defconfig files
ext4: Speedup WB_SYNC_ALL pass called from sync(2)

When doing filesystem wide sync, there's no need to force transaction
commit (or synchronously write inode buffer) separately for each inode
because ext4_sync_fs() takes care of forcing commit at the end (VFS
takes care of flushing buffer cache, respectively). Most of the time
this slowness doesn't manifest because previous WB_SYNC_NONE writeback
doesn't leave much to write but when there are processes aggressively
creating new files and several filesystems to sync, the sync slowness
can be noticeable. In the following test script sync(1) takes around 6
minutes when there are two ext4 filesystems mounted on a standard SATA
drive. After this patch sync takes a couple of seconds so we have about
two orders of magnitude improvement.

      function run_writers
      {
        for (( i = 0; i < 10; i++ )); do
          mkdir $1/dir$i
          for (( j = 0; j < 40000; j++ )); do
            dd if=/dev/zero of=$1/dir$i/$j bs=4k count=4 &>/dev/null
          done &
        done
      }

      for dir in "$@"; do
        run_writers $dir
      done

      sleep 40
      time sync
msm: kgsl: hold a process_private refcount in process_mem_print

There is a possible race condition where the process can be going
away while its debugfs 'mem' file is being read, which could cause
memory corruption.
msm: kgsl: Look up the process struct in process_mem_open()

The pointer to an active process struct stands the risk of going stale
if process_mem_open() is called just before the debugfs dentry is
destroyed.  Instead of storing and using the pointer pass the process pid
to process_mem_open() and do a lookup to ensure that we always get active
processes.
msm: kgsl: prevent kgsl_get_pagetable from returning a destroyed pt

A race condition exists between kref_get_pagetable and
kref_put_pagetable such that is is possible to put the last
reference to a pagetable slightly before it has been removed
from the list. By checking kref_get_unless_zero we can determine
if the last reference has already been released. This is safe
because the list is protected by a ptlock.

Change-Id: If6a75e9ca0dec6a12bda5739f835c936a4c3a3b4
Signed-off-by: Jeff Boody <jboody@codeaurora.org>
msm: kgsl: Fix spinlock recursion in destroy pagetable

pagetable list is protected by ptlock. Few functions
while iterating over a pagetable list takes same ptlock,
kgsl_destroy_pagetable() also need same lock. This will
cause spinlock recursion if kgsl_destroy_pagetable()
called while iterating over a list. Created two versions
of same function one is with lock and other is without
lock.

CRs-Fixed: 621172
Change-Id: I61440f99022fce8629a57bb5661e2eef9613187b
Signed-off-by: Prakash Kamliya <pkamliya@codeaurora.org>
Signed-off-by: Gaurav Gagrani <ggagrani@codeaurora.org>
Perf: Check perf activity on correct CPU

The CPU hotplug notifier is not always preempt safe.
So relying on smp_processor_id() is not correct.

Use the cpu id from the notifier as the target
CPU to check for perf activity before hotplug or power
collapse.

Change-Id: I1a96b236904a2c8ae2f82bbceab4ca8a195395d1
Signed-off-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Perf: Add L1 counters to tracepoints

Create a new tracepoint to get L1 PMU counter
information at every context switch. Counters
are captured only when the tracepoint is enabled
via perf or ftrace.
Perf: Fix counts across power collapse

After entry and exit from power collapse, the perf pm_notifier was
calling perf_pmu_disable/enable functions from perf core. Perf core
maintains a counter that it uses to match disable and enable calls but
since pm_notifier is invoked asynchronously, the counter was getting a
non-zero value which prevented the pmu from being enabled. As a result of
this, we were seeing zero counts for some cores across power collapse.

Make the architecture specific calls directly from pm_notifier.

Change-Id: I744e190906a20e70e1e4798235215c385018b121
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
Perf: Make per-process counters configurable

Add feature to enable/disable per-process tracecounters at run-time.

Change-Id: Id6a4c7a0ecd1f5add85464c6ed260860e15c4e3b
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
msm: perf: Add L2 support for tracecounters

Add L2 counter output to the tracecounters implementation.
This enables collection of L2 PMU counter values upon context switch.
Set up filtering based on number of L2 counters and number of cores.
Read L2 counter values and display them along with L1 counter values.

Change-Id: I8bbbd251ee52c66505d22ccf037c601013a916f0
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
msm: perf: Fix debug node permissions

Fix testAllFilesInSysAreNotWritable failure by changing permissions
for [/sys/kernel/debug/perf_debug_tp/enabled] from 0777 to 0660

Change-Id: Iea7fc2072ea00f011fd7a91fd16c936e42272b14
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
Perf: keep events across hotplug

Keep event list alive across a CPU hotplug so that perf
can resume when the CPU comes back online. Bring a CPU
online when exiting a perf session so it can be cleaned
up properly.
Perf: bring CPU online if needed when disabling irq

When disabling an irq, check that the CPU is online
before trying to run on that CPU. Bring the CPU
online if necessary.

This fixes a problem where a CPU that was not online
when disabling the irq caused the disable and the
free to fail. A subsequent attempt to request the irq
also failed because it had not been freed.

Change-Id: Ib873b5ded83ab843ea4e609f196a31ef0083a213
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
Perf: Support sw events across hotplug

When CPUs are hotplugged off and on, let the various
sw events continue after the hotplug.

Change-Id: Id1aaf30c459c9cf7c9c38967f9ccad56d4062fd3
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
msm: perf: initialise krait perf L2 counter enables

Clear the L2 counter enables at initialisation.
They are undefined out of reset.

Change-Id: I957106012625ae09efec47d4f657381963d87a5a
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
msm: perf: clean up duplicate constraint events

Events with a duplicate constraint are set to state=OFF when detected,
so that their duplicate counts are not read. However, they were not being
cleaned up because the core code only cleaned up ACTIVE events.
This resulted in counters not being freed and eventually running out
of resources.

Clean up the events with state==OFF that were marked that way because of
constraint duplication.
Ensure counts are not updated for OFF events.
credits: Neil Leeder <nleeder@codeaurora.org>

update kernel/evenst/core.c to CAF
Perf: Make per-process counters cumulative

In order to get overall value for performance counters, remove reset during
context switches. Add mechanism to calculate deltas for output to the trace
buffer.

Change-Id: I03d894a1b3bd400d8c256c3068f917ed001fbfd9
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
Perf: Fix PID for tracepoints

Make previous value of PID a per_cpu variable.
This is required to get the correct value for previous_pid.

Change-Id: I63baf8164ae9226189c745339b122d806901789d
Signed-off-by: Sheetal Sahasrabudhe <sheetals@codeaurora.org>