lkml.org 
[lkml]   [2013]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[RFC GIT PULL] nohz: Posix cpu timers handling on full dynticks
    Date
    Ingo,

    Please consider the following branch:

    git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
    timers/nohz-posix-timers

    Posix cpu timers, perf events tick and sched clock tick need to be
    handled in two parts:

    1) When a posix cpu timer is enqueued, a list head in perf rotation list is added
    or the sched clock is marked unstable, we need to kick the full dynticks CPUs by way
    of IPIs so that they reconsider their tick state.

    2) Before a full dynticks CPU decides to stop its tick, check if there are posix cpu timers
    in the queue, that perf rotation list isn't empty and that sched clock is stable before
    shutting down the tick.

    This branch handles the first part (which is the trickiest) for posix cpu timers
    and also settles the necessary infrastructure to do the same for perf and sched clock
    in further pull requests.

    As usual, the approach can be further optimized but it's not yet optimization time.

    Thanks.

    Frederic Weisbecker (3):
    nohz: New APIs to re-evaluate the tick on full dynticks CPUs
    posix_timers: Defer per process timer stop after timers processing
    posix_timers: Kick full dynticks CPUs when a posix cpu timer is armed

    include/linux/tick.h | 4 +++
    kernel/posix-cpu-timers.c | 35 ++++++++++++++++++++++++++++--
    kernel/time/Kconfig | 1 +
    kernel/time/tick-sched.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
    4 files changed, 88 insertions(+), 3 deletions(-)

    --
    1.7.5.4



    \
     
     \ /
      Last update: 2013-04-18 19:41    [W:3.937 / U:0.436 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site