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Subject[GIT PULL] timers/nohz updates for 3.12

Please pull the timers/nohz branch that can be found at:


It mostly contains fixes and full dynticks off-case optimizations. I believe that
distros want to enable this feature so it seems important to optimize the case
where the "nohz_full=" parameter is empty. ie: I'm trying to remove any performance
regression that comes with NO_HZ_FULL=y when the feature is not used.

This patchset improves the current situation a lot (off-case appears to be around 11% faster
with hackbench, although I guess it may vary depending on the configuration but it should be
significantly faster in any case) now there is still some work to do: I can still observe a
remaining loss of 1.6% throughput seen with hackbench compared to CONFIG_NO_HZ_FULL=n


Frederic Weisbecker (23):
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
hardirq: Split preempt count mask definitions
m68k: hardirq_count() only need preempt_mask.h
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/m68k/include/asm/irqflags.h | 2 +-
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/hardirq.h | 117 +----------------------------
include/linux/preempt_mask.h | 122 +++++++++++++++++++++++++++++
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 ++++++--------
19 files changed, 534 insertions(+), 326 deletions(-)

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