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UPSTREAM: sched/core: Add missing update_rq_clock() call for task_hot()

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Add the update_rq_clock() call at the top of the callstack instead of
at the bottom where we find it missing, this to aid later effort to
minimize the number of update_rq_lock() calls.

  WARNING: CPU: 30 PID: 194 at ../kernel/sched/sched.h:797 assert_clock_updated()
  rq->clock_update_flags < RQCF_ACT_SKIP

  Call Trace:
    dump_stack()
    __warn()
    warn_slowpath_fmt()
    assert_clock_updated.isra.63.part.64()
    can_migrate_task()
    load_balance()
    pick_next_task_fair()
    __schedule()
    schedule()
    worker_thread()
    kthread()

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit 3bed5e2166a5e433bf62162f3cd3c5174d335934)
Change-Id: Ief5070dcce486535334dcb739ee16b989ea9df42
Signed-off-by: Brendan Jackman <brendan.jackman@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
This commit is contained in:
Peter Zijlstra 2016-10-03 16:35:32 +02:00 • committed by Chris Redpath
parent bea1b621d9
commit bab39eb879
1 changed files with 2 additions and 0 deletions
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2
kernel/sched/fair.c
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@ -8998,6 +8998,7 @@ redo:
more_balance:
raw_spin_lock_irqsave(&busiest->lock, flags);
update_rq_clock(busiest);
/*
* cur_ld_moved - load moved in current iteration
@ -9395,6 +9396,7 @@ static int active_load_balance_cpu_stop(void *data)
};
schedstat_inc(sd, alb_count);
update_rq_clock(busiest_rq);
p = detach_one_task(&env);
if (p) {