change some module to compiled into kernel
change vfs from 100 -> 25
add droidwall support (XT_OWNER, IPT_REJECT) and iptable log
remove tailing '+' from kernel version
block: prepare I/O context code for BFQ

BFQ uses struct cfq_io_context to store its per-process per-device data,
reusing the same code for cic handling of CFQ.  The code is not shared
ATM to minimize the impact of these patches.

This patch introduces a new hlist to each io_context to store all the
cic's allocated by BFQ to allow calling the right destructor on module
unload; the radix tree used for cic lookup needs to be duplicated
because it can contain dead keys inserted by a scheduler and later
retrieved by the other one.

Update the io_context exit and free paths to take care also of
the BFQ cic's.

Change the type of cfqq inside struct cfq_io_context to void *
to use it also for BFQ per-queue data.

A new bfq-specific ioprio_changed field is necessary, too, to avoid
clobbering cfq's one, so switch ioprio_changed to a bitmap, with one
element per scheduler.

Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it>
Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
Signed-off-by: Francesco Allertsen <fallertsen@gmail.com>
block: add cgroups, kconfig and build bits for BFQ

Add a Kconfig option and do the related Makefile changes to compile
the BFQ I/O scheduler.  Also let the cgroups subsystem know about the
BFQ I/O controller.

Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it>
Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
block: introduce the BFQ I/O scheduler

Add the BFQ-v1-r1 I/O scheduler to 2.6.35.
The general structure is borrowed from CFQ, as much of the code. A (bfq_)queue
is associated to each task doing I/O on a device, and each time a scheduling
decision has to be taken a queue is selected and it is served until it expires.

The main differences are:
     - slices are given in the service domain: tasks are assigned budgets,
       measured in number of sectors. Once got the disk, a task must
       however consume its assigned budget within a configurable maximum time
       (by default, the maximum possible value of the budgets is automaticall
       computed to comply with this timeout). This allows the desired latency
       vs "throughput boosting" tradeoff to be set.

    - Budgets are scheduled according to a variant of WF2Q+, implemented
      using an augmented rb-tree to take eligibility into account while
      preserving an O(log N) overall complexity.

    - BFQ supports full hierarchical scheduling, exporting a cgroups
      interface.  Each node has a full scheduler, so each group can
      be assigned its own ioprio and an ioprio_class.

    - If the cgroups interface is used, weights can be explictly assigned,
      otherwise ioprio values are mapped to weights using the relation
      weight = IOPRIO_BE_NR - ioprio.

    - ioprio classes are served in strict priority order, i.e., lower
      priority queues are not served as long as there are higher priority
      queues.  Among queues in the same classes the bandwidth is distributed
      in proportion to the weights of each queue.

Regarding what has not changed it is worth noting:
    - the handling of cfq_io_contexts to associate queues to tasks.
      Much
      of the code has been reused just renaming it.  (There is room for
      code sharing with CFQ but we wanted to minimize the impact of this
      patch.)

    - The handling of async queues.

    - The handling of idle windows.

    - The handling of merging.

    - The heuristics to assert that a task is worth an idle window (with
      minor modifications to hw_tag/CIC_SEEKY detection).

Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it>
Signed-off-by: Paolo Valente <paolo.valente@unimore.it>

Ported the following commits to bfq:
    - cfq-iosched: compact io_context radix_tree (80b15c7389caa)
    - cfq-iosched: remove dead_key from cfq_io_context (bca4b914b5da3d8e)
defconfig: enable cfq, deadline & bfq IO Sched + enable mount ext2/3 as ext4
defconfig: enable powersave, userspace, ondemand & conservatice governor
add vr io sched
oops, forgot to add vr on makefile
add sio sched v0.2
defconfig: enable sio sched
cpufreq: interactive: New 'interactive' governor
New interactive governor.

This governor is designed for latency sensitive workloads, UI interaction for
example.

Advantages:
+ significantly more responsive to ramp cpu up when required (UI interaction)
+ more consistent ramping, existing governors do their cpu load sampling in a
workqueue context, the 'interactive' governor does this in a timer context, which
gives more consistent cpu load sampling.
+ higher priority for cpu frequency increase, rt_workqueue is used for scaling
up, giving the remaining tasks the cpu performance benefit, unlike existing
governors which schedule rampup work to occur after your performance starved
tasks have completed.

Existing governors sample cpu load at a particular rate, typically
every X ms. Which can lead to under powering UI threads when the user has
interacted with an idle system until the next sample period happns.

The 'interactive' governor has a different approach. Instead of sampling the cpu
at a specified rate, the governor will scale the cpu frequency up when coming
out of idle. When the cpu comes out of idle, a timer is configured to fire
within 1-2 ticks. If the cpu is 100% busy from exiting idle to when the timer
fires then we assume the cpu is underpowered and ramp to MAX speed.

If the cpu was not 100% busy, then the governor evaluates the cpu load over the
last 'min_sample_rate' (default 50000 uS) to determine the cpu speed to ramp down
to.

There is only one tuneable for this governor:
/sys/devices/system/cpu/cpufreq/interactive/min_sample_rate:
	The minimum ammount of time to spend at the current frequency before
	ramping down. This is to ensure that the governor has seen enough
	historic cpu load data to determine the appropriate workload.
	Default is 5000 uS.

Signed-off-by: Mike Chan <mike@android.com>
Change-Id: I686d2f57b0ed9cbb73217403b7438be5719588d2
cpufreq: add smartassV2 + Interacticex
defconfig: enable interactive, interactivex & smartassV2 cpufreq
sio: add missing included header file
Export scaling frequency attributes to /sys