Adds blocked_load_avg to weighted_cpuload() to take recently runnable tasks into account in load-balancing decisions. This changes the nature of weighted_cpuload() as it may >0 while there are currently no runnable tasks on the cpu rq. Hence care must be taken in the load-balance code to use cfs_rq->runnable_load_avg or nr_running when current rq status is needed.
This patch is highly experimental and will probably have require additional updates of the users of weighted_cpuload(). cc: Ingo Molnar <[email protected]> cc: Peter Zijlstra <[email protected]> Signed-off-by: Morten Rasmussen <[email protected]> --- kernel/sched/fair.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index bd950b2..ad0ebb7 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4349,7 +4349,8 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags) /* Used instead of source_load when we know the type == 0 */ static unsigned long weighted_cpuload(const int cpu) { - return cpu_rq(cpu)->cfs.runnable_load_avg; + return cpu_rq(cpu)->cfs.runnable_load_avg + + cpu_rq(cpu)->cfs.blocked_load_avg; } /* -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
