From: Sumit Bhattacharya <sumitb@nvidia.com>

dma_alloc_coherent wants to split pages after allocation in order to
reduce the memory footprint. This does not work well with GFP_COMP
pages, so drop this flag before allocation.

This patch is ported from arch/avr32
(commit 3611553ef985ef7c5863c8a94641738addd04cff).

Signed-off-by: Sumit Bhattacharya <sumitb@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Staging: android: fixed const coding style issue in binder.c
cpufreq: Memory leak with sysfs when stats table are freed
Glitch free GPU frequency changing (by MikeC84)
WiFi: allow low Wifi signals to be seen (by MikeC84)
nfs: writeback pages wait queue

The generic writeback routines are departing from congestion_wait()
in preference of get_request_wait(), aka. waiting on the block queues.

Introduce the missing writeback wait queue for NFS, otherwise its
writeback pages will grow greedily, exhausting all PG_dirty pages.

Tests show that it can effectively reduce stalls in the disk-network
pipeline, improve performance and reduce delays.

The test cases are basically

	for run in 1 2 3
	for nr_dd in 1 10 100
	for dirty_thresh in 10M 100M 1000M 2G
		start $nr_dd dd's writing to a 1-disk mem=12G NFS server

During all tests, nfs_congestion_kb is set to 1/8 dirty_thresh.

    3.2.0-rc1    3.2.0-rc1-ioless-full+
  (w/o patch)                (w/ patch)
  -----------  ------------------------
        20.66      +136.7%        48.90  thresh=1000M/nfs-100dd-1
        20.82      +147.5%        51.52  thresh=1000M/nfs-100dd-2
        20.57      +129.8%        47.26  thresh=1000M/nfs-100dd-3
        35.96       +96.5%        70.67  thresh=1000M/nfs-10dd-1
        37.47       +89.1%        70.85  thresh=1000M/nfs-10dd-2
        34.55      +106.1%        71.21  thresh=1000M/nfs-10dd-3
        58.24       +28.2%        74.63  thresh=1000M/nfs-1dd-1
        59.83       +18.6%        70.93  thresh=1000M/nfs-1dd-2
        58.30       +31.4%        76.61  thresh=1000M/nfs-1dd-3
        23.69       -10.0%        21.33  thresh=100M/nfs-100dd-1
        23.59        -1.7%        23.19  thresh=100M/nfs-100dd-2
        23.94        -1.0%        23.70  thresh=100M/nfs-100dd-3
        27.06        -0.0%        27.06  thresh=100M/nfs-10dd-1
        25.43        +4.8%        26.66  thresh=100M/nfs-10dd-2
        27.21        -0.8%        26.99  thresh=100M/nfs-10dd-3
        53.82        +4.4%        56.17  thresh=100M/nfs-1dd-1
        55.80        +4.2%        58.12  thresh=100M/nfs-1dd-2
        55.75        +2.9%        57.37  thresh=100M/nfs-1dd-3
        15.47        +1.3%        15.68  thresh=10M/nfs-10dd-1
        16.09        -3.5%        15.53  thresh=10M/nfs-10dd-2
        15.09        -0.9%        14.96  thresh=10M/nfs-10dd-3
        26.65       +13.0%        30.10  thresh=10M/nfs-1dd-1
        25.09        +7.7%        27.02  thresh=10M/nfs-1dd-2
        27.16        +3.3%        28.06  thresh=10M/nfs-1dd-3
        27.51       +78.6%        49.11  thresh=2G/nfs-100dd-1
        22.46      +131.6%        52.01  thresh=2G/nfs-100dd-2
        12.95      +289.8%        50.50  thresh=2G/nfs-100dd-3
        42.28       +81.0%        76.52  thresh=2G/nfs-10dd-1
        40.33       +78.8%        72.10  thresh=2G/nfs-10dd-2
        42.52       +67.6%        71.27  thresh=2G/nfs-10dd-3
        62.27       +34.6%        83.84  thresh=2G/nfs-1dd-1
        60.10       +35.6%        81.48  thresh=2G/nfs-1dd-2
        66.29       +17.5%        77.88  thresh=2G/nfs-1dd-3
      1164.97       +41.6%      1649.19  TOTAL write_bw
The local queue time for WRITE RPCs could be reduced by several orders!

    3.2.0-rc1    3.2.0-rc1-ioless-full+
  -----------  ------------------------
     90226.82       -99.9%        92.07  thresh=1000M/nfs-100dd-1
     88904.27       -99.9%        80.21  thresh=1000M/nfs-100dd-2
     97436.73       -99.9%        87.32  thresh=1000M/nfs-100dd-3
     62167.19       -99.3%       444.25  thresh=1000M/nfs-10dd-1
     64150.34       -99.2%       539.38  thresh=1000M/nfs-10dd-2
     78675.54       -99.3%       540.27  thresh=1000M/nfs-10dd-3
      5372.84       +57.8%      8477.45  thresh=1000M/nfs-1dd-1
     10245.66       -51.2%      4995.71  thresh=1000M/nfs-1dd-2
      4744.06      +109.1%      9919.55  thresh=1000M/nfs-1dd-3
      1727.29        -9.6%      1562.16  thresh=100M/nfs-100dd-1
      2183.49        +4.4%      2280.21  thresh=100M/nfs-100dd-2
      2201.49        +3.7%      2281.92  thresh=100M/nfs-100dd-3
      6213.73       +19.9%      7448.13  thresh=100M/nfs-10dd-1
      8127.01        +3.2%      8387.06  thresh=100M/nfs-10dd-2
      7255.35        +4.4%      7571.11  thresh=100M/nfs-10dd-3
      1144.67       +20.4%      1378.01  thresh=100M/nfs-1dd-1
      1010.02       +19.0%      1202.22  thresh=100M/nfs-1dd-2
       906.33       +15.8%      1049.76  thresh=100M/nfs-1dd-3
       642.82       +17.3%       753.80  thresh=10M/nfs-10dd-1
       766.82       -21.7%       600.18  thresh=10M/nfs-10dd-2
       575.95       +16.5%       670.85  thresh=10M/nfs-10dd-3
        21.91       +71.0%        37.47  thresh=10M/nfs-1dd-1
        16.70      +105.3%        34.29  thresh=10M/nfs-1dd-2
        19.05       -71.3%         5.47  thresh=10M/nfs-1dd-3
    123877.11       -99.0%      1187.27  thresh=2G/nfs-100dd-1
    122353.65       -98.8%      1505.84  thresh=2G/nfs-100dd-2
    101140.82       -98.4%      1641.03  thresh=2G/nfs-100dd-3
     78248.51       -98.9%       892.00  thresh=2G/nfs-10dd-1
     84589.42       -98.6%      1212.17  thresh=2G/nfs-10dd-2
     89684.95       -99.4%       495.28  thresh=2G/nfs-10dd-3
     10405.39        -6.9%      9684.57  thresh=2G/nfs-1dd-1
     16151.86       -48.5%      8316.69  thresh=2G/nfs-1dd-2
     16119.17       -49.0%      8214.84  thresh=2G/nfs-1dd-3
   1177306.98       -92.1%     93588.50  TOTAL nfs_write_queue_time
The average COMMIT size is not impacted too much.

    3.2.0-rc1    3.2.0-rc1-ioless-full+
  -----------  ------------------------
         5.56       +44.9%         8.06  thresh=1000M/nfs-100dd-1
         4.14      +109.1%         8.67  thresh=1000M/nfs-100dd-2
         5.46       +16.3%         6.35  thresh=1000M/nfs-100dd-3
        52.04        -8.4%        47.70  thresh=1000M/nfs-10dd-1
        52.33       -13.8%        45.09  thresh=1000M/nfs-10dd-2
        51.72        -9.2%        46.98  thresh=1000M/nfs-10dd-3
       484.63        -8.6%       443.16  thresh=1000M/nfs-1dd-1
       492.42        -8.2%       452.26  thresh=1000M/nfs-1dd-2
       493.13       -11.4%       437.15  thresh=1000M/nfs-1dd-3
        32.52       -72.9%         8.80  thresh=100M/nfs-100dd-1
        36.15       +26.1%        45.58  thresh=100M/nfs-100dd-2
        38.33        +0.4%        38.49  thresh=100M/nfs-100dd-3
         5.67        +0.5%         5.69  thresh=100M/nfs-10dd-1
         5.74        -1.1%         5.68  thresh=100M/nfs-10dd-2
         5.69        +0.9%         5.74  thresh=100M/nfs-10dd-3
        44.91        -1.0%        44.45  thresh=100M/nfs-1dd-1
        44.22        -0.6%        43.96  thresh=100M/nfs-1dd-2
        44.18        +0.2%        44.28  thresh=100M/nfs-1dd-3
         1.42        +1.1%         1.43  thresh=10M/nfs-10dd-1
         1.48        +0.3%         1.48  thresh=10M/nfs-10dd-2
         1.43        -1.0%         1.42  thresh=10M/nfs-10dd-3
         5.51        -6.8%         5.14  thresh=10M/nfs-1dd-1
         5.91        -8.1%         5.43  thresh=10M/nfs-1dd-2
         5.44        +3.0%         5.61  thresh=10M/nfs-1dd-3
         8.80        +6.6%         9.38  thresh=2G/nfs-100dd-1
         8.51       +65.2%        14.06  thresh=2G/nfs-100dd-2
        15.28       -13.2%        13.27  thresh=2G/nfs-100dd-3
       105.12       -24.9%        78.99  thresh=2G/nfs-10dd-1
       101.90        -9.1%        92.60  thresh=2G/nfs-10dd-2
       106.24       -29.7%        74.65  thresh=2G/nfs-10dd-3
       909.85        +0.4%       913.68  thresh=2G/nfs-1dd-1
      1030.45       -18.3%       841.68  thresh=2G/nfs-1dd-2
      1016.56       -11.6%       898.36  thresh=2G/nfs-1dd-3
      5222.74       -10.1%      4695.25  TOTAL nfs_commit_size
And here is the list of overall numbers.

    3.2.0-rc1    3.2.0-rc1-ioless-full+
  -----------  ------------------------
      1164.97       +41.6%      1649.19  TOTAL write_bw
     54799.00       +25.0%     68500.00  TOTAL nfs_nr_commits
   3543263.00        -3.3%   3425418.00  TOTAL nfs_nr_writes
      5222.74       -10.1%      4695.25  TOTAL nfs_commit_size
         7.62       +89.2%        14.42  TOTAL nfs_write_size
   1177306.98       -92.1%     93588.50  TOTAL nfs_write_queue_time
      5977.02       -16.0%      5019.34  TOTAL nfs_write_rtt_time
   1183360.15       -91.7%     98645.74  TOTAL nfs_write_execute_time
     51186.59       -62.5%     19170.98  TOTAL nfs_commit_queue_time
     81801.14        +3.6%     84735.19  TOTAL nfs_commit_rtt_time
    133015.32       -21.9%    103926.05  TOTAL nfs_commit_execute_time
Feng: do more coarse grained throttle on each ->writepages rather than
on each page, for better performance and avoid throttled-before-send-rpc
deadlock

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
increase boot speed
use HZ=300
vmscan: use N_MEM instead of N_HIGHMEM
page_alloc: allow to use N_MEM
mm: node_states: introduce N_MEMORY

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Lin Feng <linfeng@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hugetlb: use N_MEMORY instead N_HIGH_MEMORY
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
mm,migrate: use N_MEMORY instead N_HIGH_MEMORY
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
kthread: use N_MEMORY instead N_HIGH_MEMORY
N_HIGH_MEMORY stands for the nodes that has normal or high memory.
N_MEMORY stands for the nodes that has any memory.

The code here need to handle with the nodes which have memory, we should
use N_MEMORY instead.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
net: network speed tweak(in test)
sched: don't call task_group() many times in set_task_rq()
It improves perfomance, especially if autogroup enabled.

The size of set_task_rq() was 0x180 and now it is 0xa0.

Signed-off-by: Andrew Vagin <avagin@openvz.org>
 kernel/timer: Optimise apply_slack() for size and speed.

To apply proper slack, the original algorithm used to prepare a mask and
then apply the mask to obtain the appropriately rounded-off absolute
time the timer expires.

This patch modifies the masking logic to a bit-shift logic, therby
reducing the complexity and number of operations. Thus obtaining a minor
speed-up.
ashmem: fix deadlock when system is low on memory
nohz/sched: delay going tickless when CPU is loaded
intest: erase memory pages as soon as they are freed to prevent processes getting old information