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    Subject[PATCH 00/21] nohz patches for 3.12 preview v2
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    Hi,

    This is a respin of the series that optimize full dynticks off-case with
    static keys. It seems that some distros are interested in full dynticks so we
    need to optimize the off case such that unconcerned users are not impacted
    by performance regressions.

    Thanks to Steve for his reviews on the previous version! I hope the
    changelogs and comments are better in this version.

    ---

    Changes since last posting:

    * Rebase against 3.11-rc2

    * Dropped because merged in -tip through urgent queue:
    nohz: Do not warn about unstable tsc unless user uses nohz_full
    nohz: fix compile warning in tick_nohz_init()

    Reported by Steve:

    * Fix confusing comments in [03/21]
    * Fix confusing changelog [05/21]
    * Split [05/21] with new patch to enhance CONFIG_CONTEXT_TRACKING_FORCE
    Kconfig help text, see [06/21]

    Bugfixes:

    * Fix missing exported symbol, clarify changes by seperating guest APIs
    optimization in a seperate patch [09/21]

    Further:

    * Use static keys on full dynticks APIs [19-21/21]


    You can snort from:

    git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
    timers/nohz-3.12-preview-v2

    Thanks,
    Frederic
    ---

    Frederic Weisbecker (21):
    sched: Consolidate open coded preemptible() checks
    context_tracing: Fix guest accounting with native vtime
    vtime: Update a few comments
    context_tracking: Fix runtime CPU off-case
    nohz: Only enable context tracking on full dynticks CPUs
    context_tracking: Remove full dynticks' hacky dependency on wide context tracking
    context_tracking: Ground setup for static key use
    context_tracking: Optimize main APIs off case with static key
    context_tracking: Optimize guest APIs off case with static key
    context_tracking: Optimize context switch off case with static keys
    context_tracking: User/kernel broundary cross trace events
    vtime: Remove a few unneeded generic vtime state checks
    vtime: Fix racy cputime delta update
    context_tracking: Split low level state headers
    vtime: Describe overriden functions in dedicated arch headers
    vtime: Optimize full dynticks accounting off case with static keys
    vtime: Always scale generic vtime accounting results
    vtime: Always debug check snapshot source _before_ updating it
    nohz: Rename a few state variables
    nohz: Optimize full dynticks state checks with static keys
    nohz: Optimize full dynticks's sched hooks with static keys


    arch/ia64/include/asm/Kbuild | 1 +
    arch/powerpc/include/asm/Kbuild | 1 +
    arch/s390/include/asm/cputime.h | 3 -
    arch/s390/include/asm/vtime.h | 7 ++
    arch/s390/kernel/vtime.c | 1 +
    include/linux/context_tracking.h | 120 +++++++++++++++--------------
    include/linux/context_tracking_state.h | 39 +++++++++
    include/linux/tick.h | 45 +++++++++--
    include/linux/vtime.h | 74 ++++++++++++++++--
    include/trace/events/context_tracking.h | 58 ++++++++++++++
    init/Kconfig | 28 +++++--
    kernel/context_tracking.c | 128 ++++++++++++++++++-------------
    kernel/sched/core.c | 4 +-
    kernel/sched/cputime.c | 53 ++++---------
    kernel/time/Kconfig | 1 -
    kernel/time/tick-sched.c | 56 ++++++--------
    16 files changed, 410 insertions(+), 209 deletions(-)


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