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    Subject[PATCH 17/27] sched: Update rq clock before idle balancing
    Date
    idle_balance() is called from schedule() right before we schedule the
    idle task. It needs to record the idle timestamp at that time and for
    this the rq clock must be accurate. If the CPU is running tickless
    we need to update the rq clock manually.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Alessio Igor Bogani <abogani@kernel.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Chris Metcalf <cmetcalf@tilera.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Geoff Levand <geoff@infradead.org>
    Cc: Gilad Ben Yossef <gilad@benyossef.com>
    Cc: Hakan Akkan <hakanakkan@gmail.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    ---
    kernel/sched/fair.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index e78d81104..698137d 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -5241,6 +5241,7 @@ void idle_balance(int this_cpu, struct rq *this_rq)
    int pulled_task = 0;
    unsigned long next_balance = jiffies + HZ;

    + update_nohz_rq_clock(this_rq);
    this_rq->idle_stamp = this_rq->clock;

    if (this_rq->avg_idle < sysctl_sched_migration_cost)
    --
    1.7.5.4


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