Kernel 7.20 ICS-JB-MALI + RAM Buffers/Allocate Tuning.
Patch 3.0.52 Main Stream.
vmscan: move referenced VM_EXEC pages to active list

In commit 64574746, "vmscan: detect mapped file pages used only once",
Johannes Weiner, added logic to page_check_reference to cycle again
used once pages.

In commit 8cab4754, "vmscan: make mapped executable pages the first
class citizen", Wu Fengguang, added logic to shrink_active_list which
protects file-backed VM_EXEC pages by keeping them in the active_list if
they are referenced.

This patch adds logic to move such pages from the inactive list to the
active list immediately if they have been referenced. If a VM_EXEC page
is seen as referenced during an inactive list scan, that reference must
have occurred after the page was put on the inactive list. There is no
need to wait for the page to be referenced again.

Change-Id: I17c312e916377e93e5a92c52518b6c829f9ab30b
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
mm: Do not stall in synchronous compaction for THP allocations

Changelog since V1
  o Update changelog with more detail
  o Add comment on __GFP_NO_KSWAPD

Occasionally during large file copies to slow storage, there are still
reports of user-visible stalls when THP is enabled. Reports on this
have been intermittent and not reliable to reproduce locally but;

Andy Isaacson reported a problem copying to VFAT on SD Card
	https://lkml.org/lkml/2011/11/7/2

	In this case, it was stuck in munmap for betwen 20 and 60
	seconds in compaction. It is also possible that khugepaged
	was holding mmap_sem on this process if CONFIG_NUMA was set.

Johannes Weiner reported stalls on USB
	https://lkml.org/lkml/2011/7/25/378

	In this case, there is no stack trace but it looks like the
	same problem. The USB stick may have been using NTFS as a
	filesystem based on other work done related to writing back
	to USB around the same time.

Internally in SUSE, I received a bug report related to stalls in firefox
	when using Java and Flash heavily while copying from NFS
	to VFAT on USB. It has not been confirmed to be the same problem
	but if it looks like a duck and quacks like a duck.....

In the past, commit [11bc82d6: mm: compaction: Use async migration for
__GFP_NO_KSWAPD and enforce no writeback] forced that sync compaction
would never be used for THP allocations. This was reverted in commit
[c6a140bf: mm/compaction: reverse the change that forbade sync
migraton with __GFP_NO_KSWAPD] on the grounds that it was uncertain
it was beneficial.

While user-visible stalls do not happen for me when writing to USB,
I setup a test running postmark while short-lived processes created
anonymous mapping. The objective was to exercise the paths that
allocate transparent huge pages. I then logged when processes were
stalled for more than 1 second, recorded a stack strace and did some
analysis to aggregate unique "stall events" which revealed

Time stalled in this event:    47369 ms
Event count:                      20
usemem               sleep_on_page          3690 ms
usemem               sleep_on_page          2148 ms
usemem               sleep_on_page          1534 ms
usemem               sleep_on_page          1518 ms
usemem               sleep_on_page          1225 ms
usemem               sleep_on_page          2205 ms
usemem               sleep_on_page          2399 ms
usemem               sleep_on_page          2398 ms
usemem               sleep_on_page          3760 ms
usemem               sleep_on_page          1861 ms
usemem               sleep_on_page          2948 ms
usemem               sleep_on_page          1515 ms
usemem               sleep_on_page          1386 ms
usemem               sleep_on_page          1882 ms
usemem               sleep_on_page          1850 ms
usemem               sleep_on_page          3715 ms
usemem               sleep_on_page          3716 ms
usemem               sleep_on_page          4846 ms
usemem               sleep_on_page          1306 ms
usemem               sleep_on_page          1467 ms
[<ffffffff810ef30c>] wait_on_page_bit+0x6c/0x80
[<ffffffff8113de9f>] unmap_and_move+0x1bf/0x360
[<ffffffff8113e0e2>] migrate_pages+0xa2/0x1b0
[<ffffffff81134273>] compact_zone+0x1f3/0x2f0
[<ffffffff811345d8>] compact_zone_order+0xa8/0xf0
[<ffffffff811346ff>] try_to_compact_pages+0xdf/0x110
[<ffffffff810f773a>] __alloc_pages_direct_compact+0xda/0x1a0
[<ffffffff810f7d5d>] __alloc_pages_slowpath+0x55d/0x7a0
[<ffffffff810f8151>] __alloc_pages_nodemask+0x1b1/0x1c0
[<ffffffff811331db>] alloc_pages_vma+0x9b/0x160
[<ffffffff81142bb0>] do_huge_pmd_anonymous_page+0x160/0x270
[<ffffffff814410a7>] do_page_fault+0x207/0x4c0
[<ffffffff8143dde5>] page_fault+0x25/0x30

The stall times are approximate at best but the estimates represent 25%
of the worst stalls and even if the estimates are off by a factor of
10, it's severe.

This patch once again prevents sync migration for transparent
hugepage allocations as it is preferable to fail a THP allocation
than stall.

It was suggested that __GFP_NORETRY be used instead of __GFP_NO_KSWAPD
to look less like a special case. This would prevent THP allocation
using sync compaction but it would have other side-effects. There are
existing users of __GFP_NORETRY that are doing high-order allocations
and while they can handle allocation failure, it seems reasonable that
they continue to use sync compaction unless there is a deliberate
reason to change that. To help clarify this for the future, this
patch updates the comment for __GFP_NO_KSWAPD.

If accepted, this is a -stable candidate.

Reported-by: Andy Isaacson <adi@hexapodia.org>
Reported-and-tested-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
When kswapd is awoken due to reclaim by a running task, set the priority of kswapd to that of the calling task thus making memory reclaim cpu activity affected by nice level.

-ck
Add a background scanning timer to restore the watermarks to the pages_lots level and only call on it if kswapd has not been called upon for the last 5 seconds. This allows us to balance all zones to the more generous pages_lots watermark at a time unrelated to page allocation thus leading to lighter levels of vm load when called upon under page allocation.

Signed-off-by: Con Kolivas <kernel@kolivas.org>

The -ck patches modify mm/vmscan.c and add a timer to wake up kswapd every 5
seconds. This timer is initialized after the creation of the kswapd thread.

The kswapd() thread function calls mod_timer at the front of its infinite
service loop (to reset the timer to 5 seconds in the future). mod_timer()
includes a BUG_ON() to assert that the timer's callback function is set.

Since the wakeup timer is initialized after the kswapd thread is created, if
kswapd gets scheduled before kswapd_run() has prepared the timer, the
BUG_ON() check will throw a stack trace and immediately terminate the kswapd
thread.

This patch modifies the kswapd_run() function in mm/vmscan.c to initialize the
watermark timer before starting the kswapd thread.

Signed-off-by: Chase Venters <chase.venters at clientec.com>

-ck
The swap token is only useful in conditions of swap thrash, and actually worsens the common case by causing more swapping. Make it only have an effect when swap is more than half full.

-ck
+ testing "Optimize slub" -> https://github.com/AndroidDeveloperAlliance/ZenKernel_TUNA/commit/972afb6f55c801c1b844cb3ee05c1602d2594ee9
+ remove unimplemented above_background_load
Kernel 7.21 ICS-JB-MALI
mmc: use really long write timeout to deal with crappy cards

Several people have noticed that crappy SD cards take much longer to
complete multiple block writes than the 300ms that Linux specifies.
Try to work around this by using a three second write timeout instead.

This is a generalized version of a patch from Chase Maupin
<Chase.Maupin@ti.com>, whose patch description said:

* With certain SD cards timeouts like the following have been seen
  due to an improper calculation of the dto value:
    mmcblk0: error -110 transferring data, sector 4126233, nr 8,
    card status 0xc00
* By removing the dto calculation and setting the timeout value
  to the maximum specified by the SD card specification part A2
  section 2.2.15 these timeouts can be avoided.
* This change has been used by beagleboard users as well as the
  Texas Instruments SDK without a negative impact.
* There are multiple discussion threads about this but the most
  relevant ones are:
    * http://talk.maemo.org/showthread.php?p=1000707#post1000707
    * http://www.mail-archive.com/linux-omap@vger.kernel.org/msg42213.html
* Original proposal for this fix was done by Sukumar Ghoral of
  Texas Instruments
* Tested using a Texas Instruments AM335x EVM

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
cpufreq_pegasusq: tiny tweaks

-revert back to defaults and use scripts to modify them
-decrease freq_step when the screen is off
-averaging logic
Kernel 7.22 ICS-JB-MALI
BT: Full Restore from SAMMY MGMT Update 7 + Clean SG3 BT Driver, it's Unused.
module_param: make bool parameters really bool
Bluetooth: hci_ldisc: fix NULL-pointer dereference on tty_close

Do not close protocol driver until device has been unregistered.

This fixes a race between tty_close and hci_dev_open which can result in
a NULL-pointer dereference.

The line discipline closes the protocol driver while we may still have
hci_dev_open sleeping on the req_lock mutex resulting in a NULL-pointer
dereference when lock is acquired and hci_init_req called.

Bug is 100% reproducible using hciattach and a disconnected serial port:

0. # hciattach -n ttyO1 any noflow

1. hci_dev_open called from hci_power_on grabs req lock
2. hci_init_req executes but device fails to initialise (times out
   eventually)
3. hci_dev_open is called from hci_sock_ioctl and sleeps on req lock
4. hci_uart_tty_close detaches protocol driver and cancels init req
5. hci_dev_open (1) releases req lock
6. hci_dev_open (3) grabs req lock, calls hci_init_req, which triggers oops
   when request is prepared in hci_uart_send_frame

[  137.201263] Unable to handle kernel NULL pointer dereference at virtual address 00000028
[  137.209838] pgd = c0004000
[  137.212677] [00000028] *pgd=00000000
[  137.216430] Internal error: Oops: 17 [#1]
[  137.220642] Modules linked in:
[  137.223846] CPU: 0    Tainted: G        W     (3.3.0-rc6-dirty #406)
[  137.230529] PC is at __lock_acquire+0x5c/0x1ab0
[  137.235290] LR is at lock_acquire+0x9c/0x128
[  137.239776] pc : [<c0071490>]    lr : [<c00733f8>]    psr: 20000093
[  137.239776] sp : cf869dd8  ip : c0529554  fp : c051c730
[  137.251800] r10: 00000000  r9 : cf8673c0  r8 : 00000080
[  137.257293] r7 : 00000028  r6 : 00000002  r5 : 00000000  r4 : c053fd70
[  137.264129] r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 00000001
[  137.270965] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[  137.278717] Control: 10c5387d  Table: 8f0f4019  DAC: 00000015
[  137.284729] Process kworker/u:1 (pid: 7, stack limit = 0xcf8682e8)
[  137.291229] Stack: (0xcf869dd8 to 0xcf86a000)
[  137.295776] 9dc0:                                                       c0529554 00000000
[  137.304351] 9de0: cf8673c0 cf868000 d03ea1ef cf868000 000001ef 00000470 00000000 00000002
[  137.312927] 9e00: cf8673c0 00000001 c051c730 c00716ec 0000000c 00000440 c0529554 00000001
[  137.321533] 9e20: c051c730 cf868000 d03ea1f3 00000000 c053b978 00000000 00000028 cf868000
[  137.330078] 9e40: 00000000 00000000 00000002 00000000 00000000 c00733f8 00000002 00000080
[  137.338684] 9e60: 00000000 c02a1d50 00000000 00000001 60000013 c0969a1c 60000093 c053b96c
[  137.347259] 9e80: 00000002 00000018 20000013 c02a1d50 cf0ac000 00000000 00000002 cf868000
[  137.355834] 9ea0: 00000089 c0374130 00000002 00000000 c02a1d50 cf0ac000 0000000c cf0fc540
[  137.364410] 9ec0: 00000018 c02a1d50 cf0fc540 00000000 cf0fc540 c0282238 c028220c cf178d80
[  137.372985] 9ee0: 127525d8 c02821cc 9a1fa451 c032727c 9a1fa451 127525d8 cf0fc540 cf0ac4ec
[  137.381561] 9f00: cf0ac000 cf0fc540 cf0ac584 c03285f4 c0328580 cf0ac4ec cf85c740 c05510cc
[  137.390136] 9f20: ce825400 c004c914 00000002 00000000 c004c884 ce8254f5 cf869f48 00000000
[  137.398712] 9f40: c0328580 ce825415 c0a7f914 c061af64 00000000 c048cf3c cf8673c0 cf85c740
[  137.407287] 9f60: c05510cc c051a66c c05510ec c05510c4 cf85c750 cf868000 00000089 c004d6ac
[  137.415863] 9f80: 00000000 c0073d14 00000001 cf853ed8 cf85c740 c004d558 00000013 00000000
[  137.424438] 9fa0: 00000000 00000000 00000000 c00516b0 00000000 00000000 cf85c740 00000000
[  137.433013] 9fc0: 00000001 dead4ead ffffffff ffffffff c0551674 00000000 00000000 c0450aa4
[  137.441589] 9fe0: cf869fe0 cf869fe0 cf853ed8 c005162c c0013b30 c0013b30 00ffff00 00ffff00
[  137.450164] [<c0071490>] (__lock_acquire+0x5c/0x1ab0) from [<c00733f8>] (lock_acquire+0x9c/0x128)
[  137.459503] [<c00733f8>] (lock_acquire+0x9c/0x128) from [<c0374130>] (_raw_spin_lock_irqsave+0x44/0x58)
[  137.469360] [<c0374130>] (_raw_spin_lock_irqsave+0x44/0x58) from [<c02a1d50>] (skb_queue_tail+0x18/0x48)
[  137.479339] [<c02a1d50>] (skb_queue_tail+0x18/0x48) from [<c0282238>] (h4_enqueue+0x2c/0x34)
[  137.488189] [<c0282238>] (h4_enqueue+0x2c/0x34) from [<c02821cc>] (hci_uart_send_frame+0x34/0x68)
[  137.497497] [<c02821cc>] (hci_uart_send_frame+0x34/0x68) from [<c032727c>] (hci_send_frame+0x50/0x88)
[  137.507171] [<c032727c>] (hci_send_frame+0x50/0x88) from [<c03285f4>] (hci_cmd_work+0x74/0xd4)
[  137.516204] [<c03285f4>] (hci_cmd_work+0x74/0xd4) from [<c004c914>] (process_one_work+0x1a0/0x4ec)
[  137.525604] [<c004c914>] (process_one_work+0x1a0/0x4ec) from [<c004d6ac>] (worker_thread+0x154/0x344)
[  137.535278] [<c004d6ac>] (worker_thread+0x154/0x344) from [<c00516b0>] (kthread+0x84/0x90)
[  137.543975] [<c00516b0>] (kthread+0x84/0x90) from [<c0013b30>] (kernel_thread_exit+0x0/0x8)
[  137.552734] Code: e59f4e5c e5941000 e3510000 0a000031 (e5971000)
[  137.559234] ---[ end trace 1b75b31a2719ed1e ]---

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
BLOCK: ZEN I/O Sched Tuning.
SLUB,SLAB,SLOB Full merge with 3.7.RC6 :)
Added Missing code changes for my external I/O SCHED'S

 block, cfq: move icq cache management to block core

Let elevators set ->icq_size and ->icq_align in elevator_type and
elv_register() and elv_unregister() respectively create and destroy
kmem_cache for icq.

* elv_register() now can return failure.  All callers updated.

* icq caches are automatically named "ELVNAME_io_cq".

* cfq_slab_setup/kill() are collapsed into cfq_init/exit().

* While at it, minor indentation change for iosched_cfq.elevator_name
  for consistency.

This will help moving icq management to block core.  This doesn't
introduce any functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Code Slyle fix for vr-iosched, what a mess!