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Commit 4a55b450 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: improve prev_sum_exec_runtime setting 



Second preparatory patch for fix-ideal runtime:

Mark prev_sum_exec_runtime at the beginning of our run, the same spot
that adds our wait period to wait_runtime. This seems a more natural
location to do this, and it also reduces the code a bit:

   text    data     bss     dec     hex filename
  13397     228    1204   14829    39ed sched.o.before
  13391     228    1204   14823    39e7 sched.o.after

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7c92e54f

kernel/sched_fair.c

+2 −3
Original line number Original line Diff line number Diff line
@@ -684,10 +684,8 @@ __check_preempt_curr_fair(struct cfs_rq *cfs_rq, struct sched_entity *se, 
	 * preempt the current task unless the best task has

	 * preempt the current task unless the best task has

	 * a larger than sched_granularity fairness advantage:

	 * a larger than sched_granularity fairness advantage:

	 */

	 */

	if (__delta > niced_granularity(curr, granularity)) {

	if (__delta > niced_granularity(curr, granularity))

		resched_task(rq_of(cfs_rq)->curr);

		resched_task(rq_of(cfs_rq)->curr);

		curr->prev_sum_exec_runtime = curr->sum_exec_runtime;

	}

}

}





static inline void

static inline void
@@ -703,6 +701,7 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) 
	update_stats_wait_end(cfs_rq, se);

	update_stats_wait_end(cfs_rq, se);

	update_stats_curr_start(cfs_rq, se);

	update_stats_curr_start(cfs_rq, se);

	set_cfs_rq_curr(cfs_rq, se);

	set_cfs_rq_curr(cfs_rq, se);

	se->prev_sum_exec_runtime = se->sum_exec_runtime;

}

}





static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)

static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)