Commit-ID: 763e54552ad8eebb213db1fc591724067d83d95d Gitweb: http://git.kernel.org/tip/763e54552ad8eebb213db1fc591724067d83d95d Author: Ben Segall <bsegall@xxxxxxxxxx> AuthorDate: Thu, 15 May 2014 15:59:20 -0700 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Mon, 19 May 2014 22:02:39 +0900 sched: Fix exec_start/task_hot on migrated tasks task_hot checks exec_start on any runnable task, but if it has been migrated since the it last ran, then exec_start is a clock_task from another cpu. If the old cpu's clock_task was sufficiently far ahead of this cpu's then the task will not be considered for another migration until it has run. Instead reset exec_start whenever a task is migrated, since it is presumably no longer hot anyway. Cc: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Ben Segall <bsegall@xxxxxxxxxx> [peterz: made it compile] Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/20140515225920.7179.13924.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- kernel/sched/fair.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 28ccf50..dd3fa14 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4544,6 +4544,9 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu) atomic_long_add(se->avg.load_avg_contrib, &cfs_rq->removed_load); } + + /* We have migrated, no longer consider this task hot */ + se->exec_start = 0; } #endif /* CONFIG_SMP */ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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