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    Subject[PATCH v2 0/5] sched, timer: Improve scalability of itimers
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    This patchset improves the scalability of itimers, thread_group_cputimer
    and addresses a performance issue we found while running a database
    workload where more than 30% of total time is spent in the kernel
    trying to acquire the thread_group_cputimer spinlock.

    While we're modifying sched and timer, patch 1 also updates all existing
    usages of ACCESS_ONCE with the new READ_ONCE and WRITE_ONCE APIs in
    those areas.

    Jason Low (5):
    sched, timer: Remove usages of ACCESS_ONCE in the scheduler
    sched, numa: Document usages of mm->numa_scan_seq
    sched, timer: Use atomics in thread_group_cputimer to improve
    scalability
    sched, timer: Provide an atomic task_cputime data structure
    sched, timer: Use the atomic task_cputime in thread_group_cputimer

    include/linux/init_task.h | 5 +-
    include/linux/sched.h | 29 +++++++++----
    kernel/fork.c | 5 +--
    kernel/sched/auto_group.c | 2 +-
    kernel/sched/auto_group.h | 2 +-
    kernel/sched/core.c | 4 +-
    kernel/sched/cputime.c | 2 +-
    kernel/sched/deadline.c | 2 +-
    kernel/sched/fair.c | 26 +++++++++---
    kernel/sched/proc.c | 4 +-
    kernel/sched/rt.c | 2 +-
    kernel/sched/sched.h | 2 +-
    kernel/sched/stats.h | 15 ++-----
    kernel/sched/wait.c | 4 +-
    kernel/time/posix-cpu-timers.c | 87 +++++++++++++++++++++++++---------------
    15 files changed, 113 insertions(+), 78 deletions(-)

    --
    1.7.2.5



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