Add CPU-Boost driver
CPU-Boost added
intelli_plug update-prep patch
intelli_plug: use a context safe function call instead

Signed-off-by: Paul Reioux <reioux@gmail.com>
intelli_plug: performance tune-up continued...

Signed-off-by: Paul Reioux <reioux@gmail.com>
intellidemand: sync with Hammerhead Intellidemand 5.0
intellidemand: minor clean up and tailor for APQ8064 devices

Signed-off-by: Paul Reioux <reioux@gmail.com>
intelli_plug: tune for tablet devices

Signed-off-by: Paul Reioux <reioux@gmail.com>
perf/arm: Fix armpmu_map_hw_event()

Fix constraint check in armpmu_map_hw_event().

Reported-and-tested-by: Vince Weaver <vincent.weaver@maine.edu>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Patrick Tjin <pattjin@google.com>
net-fixes: flow_dissector: prevent an infinite loop (CVE-2013-4348)

Jason Wang found that a malicious packet could make skb_flow_dissect()
loop forever. We must check that IP header has a valid ihl to avoid
this loop. It involves IPIP encapsulation and ihl = 0 to trigger.

Given this bug is critical, I cooked a patch before having
a fix in upstream kernel.

Tested:

 Compiled/booted
 Ran some tests on bnx2x and explicitely disabled hardware provided rxhash
 ethtool -K eth1 rxhash off
 ethtool -K eth2 rxhash off

Google-Bug-Id: 11465355
Effort: net-fixes
Change-Id: I813e4dc48cecb05f8edfa218304e1f13fd764323
Signed-off-by: Ed Tam <etam@google.com>
Add CONFIG_NETFILTER_XT_TARGET_TCPMSS support

set CONFIG_NETFILTER_XT_TARGET_TCPMSS=y in mako defconfig

Bug: 11579326
fs: vfat: reduce the worst case latencies

When a block partition is mounted with FAT file system
and MS_DIRSYNC option is used, some file system operations
like create, rename shall sleep in caller's context until
all the metadata have been committed to the non-volatile memory.
Since this operation is blocking call for user context,
the WRITE_SYNC option must be used instead of WRITE
(async operation) which incur inherent latencies while
flushing the meta-data corresponding to directory entries

Change-Id: I41c514889873a39d564271db0a421e6c66e5ae33
Signed-off-by: xiaogang <xiaogang@codeaurora.org>
softirq: reduce latencies

Date	Thu, 03 Jan 2013 23:49:40 -0800

In various network workloads, __do_softirq() latencies can be up
to 20 ms if HZ=1000, and 200 ms if HZ=100.

This is because we iterate 10 times in the softirq dispatcher,
and some actions can consume a lot of cycles.

This patch changes the fallback to ksoftirqd condition to :

- A time limit of 2 ms.
- need_resched() being set on current task

When one of this condition is met, we wakeup ksoftirqd for further
softirq processing if we still have pending softirqs.

Using need_resched() as the only condition can trigger RCU stalls,
as we can keep BH disabled for too long.

I ran several benchmarks and got no significant difference in
throughput, but a very significant reduction of latencies (one order
of magnitude) :

In following bench, 200 antagonist "netperf -t TCP_RR" are started in
background, using all available cpus.

Then we start one "netperf -t TCP_RR", bound to the cpu handling the NIC
IRQ (hard+soft)

Before patch :

RT_LATENCY,MIN_LATENCY,MAX_LATENCY,P50_LATENCY,P90_LATENCY,P99_LATENCY,MEAN_LATENCY,STDDEV_LATENCY
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET
to 7.7.7.84 () port 0 AF_INET : first burst 0 : cpu bind
RT_LATENCY=550110.424
MIN_LATENCY=146858
MAX_LATENCY=997109
P50_LATENCY=305000
P90_LATENCY=550000
P99_LATENCY=710000
MEAN_LATENCY=376989.12
STDDEV_LATENCY=184046.92
After patch :

RT_LATENCY,MIN_LATENCY,MAX_LATENCY,P50_LATENCY,P90_LATENCY,P99_LATENCY,MEAN_LATENCY,STDDEV_LATENCY
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET
to 7.7.7.84 () port 0 AF_INET : first burst 0 : cpu bind
RT_LATENCY=40545.492
MIN_LATENCY=9834
MAX_LATENCY=78366
P50_LATENCY=33583
P90_LATENCY=59000
P99_LATENCY=69000
MEAN_LATENCY=38364.67
STDDEV_LATENCY=12865.26

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Miller <davem@davemloft.net>
Cc: Tom Herbert <therbert@google.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>

Signed-off-by: Paul Reioux <reioux@gmail.com>
sched/rt: Remove redundant nr_cpus_allowed test

Date	Fri, 4 Oct 2013 14:24:53 -0500

From: Shawn Bohrer <sbohrer@rgmadvisors.com>

In 76854c7e8f3f4172fef091e78d88b3b751463ac6 "sched: Use
rt.nr_cpus_allowed to recover select_task_rq() cycles" an optimization
was added to select_task_rq_rt() that immediately returns when
p->nr_cpus_allowed == 1 at the beginning of the function.  This makes
the latter p->nr_cpus_allowed > 1 check redundant and can be removed.
Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>

Signed-off-by: Paul Reioux <reioux@gmail.com>
epoll: optimize EPOLL_CTL_DEL using rcu

Date	Tue, 1 Oct 2013 17:08:10 +0000 (GMT)

Optimize EPOLL_CTL_DEL such that it does not require the 'epmutex' by
converting the file->f_ep_links list into an rcu one. In this way, we can
traverse the epoll network on the add path in parallel with deletes. Since
deletes can't create loops or worse wakeup paths, this is safe.

This patch in combination with the patch "epoll: Do not take global 'epmutex'
for simple topologies", shows a dramatic performance improvement in
scalability for SPECjbb.

Tested-by: Nathan Zimmer <nzimmer@sgi.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>

backported for Linux 3.4 for use on Android
Signed-off-by: Paul Reioux <reioux@gmail.com>
epoll: Do not take global 'epmutex' for simple topologies

Date	Tue, 1 Oct 2013 17:08:14 +0000 (GMT)

When calling EPOLL_CTL_ADD for an epoll file descriptor that is attached
directly to a wakeup source, we do not need to take the global 'epmutex',
unless the epoll file descriptor is nested. The purpose of taking
the 'epmutex' on add is to prevent complex topologies such as loops and
deep wakeup paths from forming in parallel through multiple EPOLL_CTL_ADD
operations. However, for the simple case of an epoll file descriptor
attached directly to a wakeup source (with no nesting), we do not need
to hold the 'epmutex'.

This patch along with 'epoll: optimize EPOLL_CTL_DEL using rcu' improves
scalability on larger systems. Quoting Nathan Zimmer's mail on SPECjbb
performance:

"
On the 16 socket run the performance went from 35k jOPS to 125k jOPS.
In addition the benchmark when from scaling well on 10 sockets to scaling well
on just over 40 sockets.

...

Currently the benchmark stops scaling at around 40-44 sockets but it seems like
I found a second unrelated bottleneck.
"

Tested-by: Nathan Zimmer <nzimmer@sgi.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>

backported to Linux 3.4 for use on Android
Signed-off-by: Paul Reioux <reioux@gmail.com>
epoll: do not take globals epmutex for simple topologies fix

- use `bool' for boolean variables
- remove unneeded/undesirable cast of void*
- add missed ep_scan_ready_list() kerneldoc

Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Eric Wong <normalperson@yhbt.net>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Nathan Zimmer <nzimmer@sgi.com>
Cc: Nelson Elhage <nelhage@nelhage.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs/namespace.c: making system wide mounting possible

Signed-off-by: Paul Reioux <reioux@gmail.com>
driver/input/touchscreen: add new s2w & dt2w implemenation from hammerhead

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/input/touchscreen/doubletap2wake: Fix compilation with earlysuspend

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>