When determining whether or not a task is likely to be cache hot based on its execution start time, we need to ensure the runqueue task clock is accurate and up to date.
Cc: Peter Zijlstra <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Mike Galbraith <[email protected]> Signed-off-by: Matt Fleming <[email protected]> --- kernel/sched/fair.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 7f8a61e97599..85ca4ddab0d3 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6096,6 +6096,7 @@ static int task_hot(struct task_struct *p, struct lb_env *env) if (sysctl_sched_migration_cost == 0) return 0; + update_rq_clock(env->src_rq); delta = rq_clock_task(env->src_rq) - p->se.exec_start; return delta < (s64)sysctl_sched_migration_cost; -- 2.9.3
