lkml.org 
[lkml]   [2018]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 2/5] sched/isolation: Add scheduler tick offloading interface
    Date
    Add the boot option that will allow us to offload the 1Hz scheduler tick
    to the housekeeping CPU.

    Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
    Cc: Chris Metcalf <cmetcalf@mellanox.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Luiz Capitulino <lcapitulino@redhat.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Wanpeng Li <kernellwp@gmail.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    ---
    include/linux/sched/isolation.h | 3 ++-
    kernel/sched/isolation.c | 6 ++++++
    2 files changed, 8 insertions(+), 1 deletion(-)

    diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
    index d849431..c831855 100644
    --- a/include/linux/sched/isolation.h
    +++ b/include/linux/sched/isolation.h
    @@ -11,7 +11,8 @@ enum hk_flags {
    HK_FLAG_MISC = (1 << 2),
    HK_FLAG_SCHED = (1 << 3),
    HK_FLAG_TICK = (1 << 4),
    - HK_FLAG_DOMAIN = (1 << 5),
    + HK_FLAG_TICK_SCHED = (1 << 5),
    + HK_FLAG_DOMAIN = (1 << 6),
    };

    #ifdef CONFIG_CPU_ISOLATION
    diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
    index b71b436..264ddcd 100644
    --- a/kernel/sched/isolation.c
    +++ b/kernel/sched/isolation.c
    @@ -136,6 +136,12 @@ static int __init housekeeping_isolcpus_setup(char *str)
    continue;
    }

    + if (!strncmp(str, "nohz_offload,", 13)) {
    + str += 13;
    + flags |= HK_FLAG_TICK | HK_FLAG_TICK_SCHED;
    + continue;
    + }
    +
    if (!strncmp(str, "domain,", 7)) {
    str += 7;
    flags |= HK_FLAG_DOMAIN;
    --
    2.7.4
    \
     
     \ /
      Last update: 2018-01-04 05:27    [W:2.099 / U:0.048 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site