1. 02 Jul, 2012 5 commits
  2. 20 Jun, 2012 3 commits
    • Joonsoo Kim's avatar
      slub: refactoring unfreeze_partials() · 43d77867
      Joonsoo Kim authored
      Current implementation of unfreeze_partials() is so complicated,
      but benefit from it is insignificant. In addition many code in
      do {} while loop have a bad influence to a fail rate of cmpxchg_double_slab.
      Under current implementation which test status of cpu partial slab
      and acquire list_lock in do {} while loop,
      we don't need to acquire a list_lock and gain a little benefit
      when front of the cpu partial slab is to be discarded, but this is a rare case.
      In case that add_partial is performed and cmpxchg_double_slab is failed,
      remove_partial should be called case by case.
      
      I think that these are disadvantages of current implementation,
      so I do refactoring unfreeze_partials().
      
      Minimizing code in do {} while loop introduce a reduced fail rate
      of cmpxchg_double_slab. Below is output of 'slabinfo -r kmalloc-256'
      when './perf stat -r 33 hackbench 50 process 4000 > /dev/null' is done.
      
      ** before **
      Cmpxchg_double Looping
      ------------------------
      Locked Cmpxchg Double redos   182685
      Unlocked Cmpxchg Double redos 0
      
      ** after **
      Cmpxchg_double Looping
      ------------------------
      Locked Cmpxchg Double redos   177995
      Unlocked Cmpxchg Double redos 1
      
      We can see cmpxchg_double_slab fail rate is improved slightly.
      
      Bolow is output of './perf stat -r 30 hackbench 50 process 4000 > /dev/null'.
      
      ** before **
       Performance counter stats for './hackbench 50 process 4000' (30 runs):
      
           108517.190463 task-clock                #    7.926 CPUs utilized            ( +-  0.24% )
               2,919,550 context-switches          #    0.027 M/sec                    ( +-  3.07% )
                 100,774 CPU-migrations            #    0.929 K/sec                    ( +-  4.72% )
                 124,201 page-faults               #    0.001 M/sec                    ( +-  0.15% )
         401,500,234,387 cycles                    #    3.700 GHz                      ( +-  0.24% )
         <not supported> stalled-cycles-frontend
         <not supported> stalled-cycles-backend
         250,576,913,354 instructions              #    0.62  insns per cycle          ( +-  0.13% )
          45,934,956,860 branches                  #  423.297 M/sec                    ( +-  0.14% )
             188,219,787 branch-misses             #    0.41% of all branches          ( +-  0.56% )
      
            13.691837307 seconds time elapsed                                          ( +-  0.24% )
      
      ** after **
       Performance counter stats for './hackbench 50 process 4000' (30 runs):
      
           107784.479767 task-clock                #    7.928 CPUs utilized            ( +-  0.22% )
               2,834,781 context-switches          #    0.026 M/sec                    ( +-  2.33% )
                  93,083 CPU-migrations            #    0.864 K/sec                    ( +-  3.45% )
                 123,967 page-faults               #    0.001 M/sec                    ( +-  0.15% )
         398,781,421,836 cycles                    #    3.700 GHz                      ( +-  0.22% )
         <not supported> stalled-cycles-frontend
         <not supported> stalled-cycles-backend
         250,189,160,419 instructions              #    0.63  insns per cycle          ( +-  0.09% )
          45,855,370,128 branches                  #  425.436 M/sec                    ( +-  0.10% )
             169,881,248 branch-misses             #    0.37% of all branches          ( +-  0.43% )
      
            13.596272341 seconds time elapsed                                          ( +-  0.22% )
      
      No regression is found, but rather we can see slightly better result.
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Signed-off-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
      43d77867
    • Joonsoo Kim's avatar
      slub: use __cmpxchg_double_slab() at interrupt disabled place · d24ac77f
      Joonsoo Kim authored
      get_freelist(), unfreeze_partials() are only called with interrupt disabled,
      so __cmpxchg_double_slab() is suitable.
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Signed-off-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
      d24ac77f
    • Andi Kleen's avatar
      slab/mempolicy: always use local policy from interrupt context · e7b691b0
      Andi Kleen authored
      slab_node() could access current->mempolicy from interrupt context.
      However there's a race condition during exit where the mempolicy
      is first freed and then the pointer zeroed.
      
      Using this from interrupts seems bogus anyways. The interrupt
      will interrupt a random process and therefore get a random
      mempolicy. Many times, this will be idle's, which noone can change.
      
      Just disable this here and always use local for slab
      from interrupts. I also cleaned up the callers of slab_node a bit
      which always passed the same argument.
      
      I believe the original mempolicy code did that in fact,
      so it's likely a regression.
      
      v2: send version with correct logic
      v3: simplify. fix typo.
      Reported-by: default avatarArun Sharma <asharma@fb.com>
      Cc: penberg@kernel.org
      Cc: cl@linux.com
      Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
      [tdmackey@twitter.com: Rework control flow based on feedback from
      cl@linux.com, fix logic, and cleanup current task_struct reference]
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Signed-off-by: default avatarDavid Mackey <tdmackey@twitter.com>
      Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
      e7b691b0
  3. 14 Jun, 2012 7 commits
  4. 04 Jun, 2012 1 commit
  5. 03 Jun, 2012 2 commits
  6. 02 Jun, 2012 18 commits
  7. 01 Jun, 2012 4 commits
    • Linus Torvalds's avatar
      Merge tag 'fbdev-updates-for-3.5' of git://github.com/schandinat/linux-2.6 · 804ce986
      Linus Torvalds authored
      Pull fbdev updates from Florian Tobias Schandinat:
       - driver for AUO-K1900 and AUO-K1901 epaper controller
       - large updates for OMAP (e.g. decouple HDMI audio and video)
       - some updates for Exynos and SH Mobile
       - various other small fixes and cleanups
      
      * tag 'fbdev-updates-for-3.5' of git://github.com/schandinat/linux-2.6: (130 commits)
        video: bfin_adv7393fb: Fix cleanup code
        video: exynos_dp: reduce delay time when configuring video setting
        video: exynos_dp: move sw reset prioir to enabling sw defined function
        video: exynos_dp: use devm_ functions
        fb: handle NULL pointers in framebuffer release
        OMAPDSS: HDMI: OMAP4: Update IRQ flags for the HPD IRQ request
        OMAPDSS: Apply VENC timings even if panel is disabled
        OMAPDSS: VENC/DISPC: Delay dividing Y resolution for managers connected to VENC
        OMAPDSS: DISPC: Support rotation through TILER
        OMAPDSS: VRFB: remove compiler warnings when CONFIG_BUG=n
        OMAPFB: remove compiler warnings when CONFIG_BUG=n
        OMAPDSS: remove compiler warnings when CONFIG_BUG=n
        OMAPDSS: DISPC: fix usage of dispc_ovl_set_accu_uv
        OMAPDSS: use DSI_FIFO_BUG workaround only for manual update displays
        OMAPDSS: DSI: Support command mode interleaving during video mode blanking periods
        OMAPDSS: DISPC: Update Accumulator configuration for chroma plane
        drivers/video: fsl-diu-fb: don't initialize the THRESHOLDS registers
        video: exynos mipi dsi: support reverse panel type
        video: exynos mipi dsi: Properly interpret the interrupt source flags
        video: exynos mipi dsi: Avoid races in probe()
        ...
      804ce986
    • Linus Torvalds's avatar
      Merge tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd · f5e7e844
      Linus Torvalds authored
      Pull mtd update from David Woodhouse:
       - More robust parsing especially of xattr data in JFFS2
       - Updates to mxc_nand and gpmi drivers to support new boards and device tree
       - Improve consistency of information about ECC strength in NAND devices
       - Clean up partition handling of plat_nand
       - Support NAND drivers without dedicated access to OOB area
       - BCH hardware ECC support for OMAP
       - Other fixes and cleanups, and a few new device IDs
      
      Fixed trivial conflict in drivers/mtd/nand/gpmi-nand/gpmi-nand.c due to
      added include files next to each other.
      
      * tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd: (75 commits)
        mtd: mxc_nand: move ecc strengh setup before nand_scan_tail
        mtd: block2mtd: fix recursive call of mtd_writev
        mtd: gpmi-nand: define ecc.strength
        mtd: of_parts: fix breakage in Kconfig
        mtd: nand: fix scan_read_raw_oob
        mtd: docg3 fix in-middle of blocks reads
        mtd: cfi_cmdset_0002: Slight cleanup of fixup messages
        mtd: add fixup for S29NS512P NOR flash.
        jffs2: allow to complete xattr integrity check on first GC scan
        jffs2: allow to discriminate between recoverable and non-recoverable errors
        mtd: nand: omap: add support for hardware BCH ecc
        ARM: OMAP3: gpmc: add BCH ecc api and modes
        mtd: nand: check the return code of 'read_oob/read_oob_raw'
        mtd: nand: remove 'sndcmd' parameter of 'read_oob/read_oob_raw'
        mtd: m25p80: Add support for Winbond W25Q80BW
        jffs2: get rid of jffs2_sync_super
        jffs2: remove unnecessary GC pass on sync
        jffs2: remove unnecessary GC pass on umount
        jffs2: remove lock_super
        mtd: gpmi: add gpmi support for mx6q
        ...
      f5e7e844
    • Linus Torvalds's avatar
      Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 · 48445159
      Linus Torvalds authored
      Pull x86 platform driver updates from Matthew Garrett:
       "Some significant improvements for the Sony driver on newer machines,
        but other than that mostly just minor fixes and a patch to remove the
        broken rfkill code from the Dell driver."
      
      * 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86: (35 commits)
        apple-gmux: Fix up the suspend/resume patch
        dell-laptop: Remove rfkill code
        toshiba_acpi: Fix mis-merge
        dell-laptop: Add touchpad led support for Dell V3450
        acer-wmi: add 3 laptops to video backlight vendor mode quirk table
        sony-laptop: add touchpad enable/disable function
        sony-laptop: add missing Fn key combos for 0x100 handlers
        sony-laptop: add support for more WWAN modems
        sony-laptop: new keyboard backlight handle
        sony-laptop: add high speed battery charging function
        sony-laptop: support automatic resume on lid open
        sony-laptop: adjust error handling in finding SNC handles
        sony-laptop: add thermal profiles support
        sony-laptop: support battery care functions
        sony-laptop: additional debug statements
        sony-laptop: improve SNC initialization and acpi notify callback code
        sony-laptop: use kstrtoul to parse sysfs values
        sony-laptop: generalise ACPI calls into SNC functions
        sony-laptop: fix return path when no ACPI buffer is allocated
        sony-laptop: use soft rfkill status stored in hw
        ...
      48445159
    • Linus Torvalds's avatar
      Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux · af4f8ba3
      Linus Torvalds authored
      Pull slab updates from Pekka Enberg:
       "Mainly a bunch of SLUB fixes from Joonsoo Kim"
      
      * 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux:
        slub: use __SetPageSlab function to set PG_slab flag
        slub: fix a memory leak in get_partial_node()
        slub: remove unused argument of init_kmem_cache_node()
        slub: fix a possible memory leak
        Documentations: Fix slabinfo.c directory in vm/slub.txt
        slub: fix incorrect return type of get_any_partial()
      af4f8ba3