From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, linux-kernel@vger.kernel.org, tj@kernel.org,
josef@toxicpanda.com
Cc: torvalds@linux-foundation.org, vincent.guittot@linaro.org,
efault@gmx.de, pjt@google.com, clm@fb.com,
dietmar.eggemann@arm.com, morten.rasmussen@arm.com,
bsegall@google.com, yuyang.du@intel.com, peterz@infradead.org
Subject: [PATCH -v2 06/18] sched/fair: Move enqueue migrate handling
Date: Fri, 01 Sep 2017 15:21:05 +0200 [thread overview]
Message-ID: <20170901132748.288032055@infradead.org> (raw)
In-Reply-To: 20170901132059.342024223@infradead.org
[-- Attachment #1: peterz-sched-pull-migrate-into-update_load_avg.patch --]
[-- Type: text/plain, Size: 4074 bytes --]
Move the entity migrate handling from enqueue_entity_load_avg() to
update_load_avg(). This has two benefits:
- {en,de}queue_entity_load_avg() will become purely about managing
runnable_load
- we can avoid a double update_tg_load_avg() and reduce pressure on
the global tg->shares cacheline
The reason we do this is so that we can change update_cfs_shares() to
change both weight and (future) runnable_weight. For this to work we
need to have the cfs_rq averages up-to-date (which means having done
the attach), but we need the cfs_rq->avg.runnable_avg to not yet
include the se's contribution (since se->on_rq == 0).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 70 ++++++++++++++++++++++++++--------------------------
1 file changed, 36 insertions(+), 34 deletions(-)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3491,34 +3491,6 @@ update_cfs_rq_load_avg(u64 now, struct c
return decayed || removed_load;
}
-/*
- * Optional action to be done while updating the load average
- */
-#define UPDATE_TG 0x1
-#define SKIP_AGE_LOAD 0x2
-
-/* Update task and its cfs_rq load average */
-static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
-{
- u64 now = cfs_rq_clock_task(cfs_rq);
- struct rq *rq = rq_of(cfs_rq);
- int cpu = cpu_of(rq);
- int decayed;
-
- /*
- * Track task load average for carrying it to new CPU after migrated, and
- * track group sched_entity load average for task_h_load calc in migration
- */
- if (se->avg.last_update_time && !(flags & SKIP_AGE_LOAD))
- __update_load_avg_se(now, cpu, cfs_rq, se);
-
- decayed = update_cfs_rq_load_avg(now, cfs_rq);
- decayed |= propagate_entity_load_avg(se);
-
- if (decayed && (flags & UPDATE_TG))
- update_tg_load_avg(cfs_rq, 0);
-}
-
/**
* attach_entity_load_avg - attach this entity to its cfs_rq load avg
* @cfs_rq: cfs_rq to attach to
@@ -3559,17 +3531,46 @@ static void detach_entity_load_avg(struc
cfs_rq_util_change(cfs_rq);
}
+/*
+ * Optional action to be done while updating the load average
+ */
+#define UPDATE_TG 0x1
+#define SKIP_AGE_LOAD 0x2
+#define DO_ATTACH 0x4
+
+/* Update task and its cfs_rq load average */
+static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
+{
+ u64 now = cfs_rq_clock_task(cfs_rq);
+ struct rq *rq = rq_of(cfs_rq);
+ int cpu = cpu_of(rq);
+ int decayed;
+
+ /*
+ * Track task load average for carrying it to new CPU after migrated, and
+ * track group sched_entity load average for task_h_load calc in migration
+ */
+ if (se->avg.last_update_time && !(flags & SKIP_AGE_LOAD))
+ __update_load_avg_se(now, cpu, cfs_rq, se);
+
+ decayed = update_cfs_rq_load_avg(now, cfs_rq);
+ decayed |= propagate_entity_load_avg(se);
+
+ if (!se->avg.last_update_time && (flags & DO_ATTACH)) {
+
+ attach_entity_load_avg(cfs_rq, se);
+ update_tg_load_avg(cfs_rq, 0);
+
+ } else if (decayed && (flags & UPDATE_TG))
+ update_tg_load_avg(cfs_rq, 0);
+}
+
/* Add the load generated by se into cfs_rq's load average */
static inline void
enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
cfs_rq->runnable_load_avg += se->avg.load_avg;
cfs_rq->runnable_load_sum += se_weight(se) * se->avg.load_sum;
-
- if (!se->avg.last_update_time) {
- attach_entity_load_avg(cfs_rq, se);
- update_tg_load_avg(cfs_rq, 0);
- }
}
/* Remove the runnable load generated by se from cfs_rq's runnable load average */
@@ -3659,6 +3660,7 @@ update_cfs_rq_load_avg(u64 now, struct c
#define UPDATE_TG 0x0
#define SKIP_AGE_LOAD 0x0
+#define DO_ATTACH 0x0
static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int not_used1)
{
@@ -3813,7 +3815,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, st
* its group cfs_rq
* - Add its new weight to cfs_rq->load.weight
*/
- update_load_avg(cfs_rq, se, UPDATE_TG);
+ update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH);
enqueue_entity_load_avg(cfs_rq, se);
update_cfs_shares(se);
account_entity_enqueue(cfs_rq, se);
next prev parent reply other threads:[~2017-09-01 13:35 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 13:20 [PATCH -v2 00/18] sched/fair: A bit of a cgroup/PELT overhaul Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 01/18] sched/fair: Clean up calc_cfs_shares() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 02/18] sched/fair: Add comment to calc_cfs_shares() Peter Zijlstra
2017-09-28 10:03 ` Morten Rasmussen
2017-09-29 11:35 ` Peter Zijlstra
2017-09-29 13:03 ` Morten Rasmussen
2017-09-01 13:21 ` [PATCH -v2 03/18] sched/fair: Cure calc_cfs_shares() vs reweight_entity() Peter Zijlstra
2017-09-29 9:04 ` Morten Rasmussen
2017-09-29 11:38 ` Peter Zijlstra
2017-09-29 13:00 ` Morten Rasmussen
2017-09-01 13:21 ` [PATCH -v2 04/18] sched/fair: Remove se->load.weight from se->avg.load_sum Peter Zijlstra
2017-09-29 15:26 ` Morten Rasmussen
2017-09-29 16:39 ` Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 05/18] sched/fair: Change update_load_avg() arguments Peter Zijlstra
2017-09-01 13:21 ` Peter Zijlstra [this message]
2017-09-01 13:21 ` [PATCH -v2 07/18] sched/fair: Rename {en,de}queue_entity_load_avg() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 08/18] sched/fair: Introduce {en,de}queue_load_avg() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 09/18] sched/fair: More accurate reweight_entity() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 10/18] sched/fair: Use reweight_entity() for set_user_nice() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 11/18] sched/fair: Rewrite cfs_rq->removed_*avg Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 12/18] sched/fair: Rewrite PELT migration propagation Peter Zijlstra
2017-10-09 8:08 ` Morten Rasmussen
2017-10-09 9:45 ` Peter Zijlstra
2017-10-18 12:45 ` Morten Rasmussen
2017-10-30 13:35 ` Peter Zijlstra
2017-10-09 15:03 ` Vincent Guittot
2017-10-09 15:29 ` Vincent Guittot
2017-10-10 7:29 ` Peter Zijlstra
2017-10-10 7:44 ` Vincent Guittot
2017-10-13 15:22 ` Vincent Guittot
2017-10-13 20:41 ` Peter Zijlstra
2017-10-15 12:01 ` Vincent Guittot
2017-10-16 13:55 ` Vincent Guittot
2017-10-19 15:04 ` Vincent Guittot
2017-10-30 17:20 ` Peter Zijlstra
2017-10-31 11:14 ` Vincent Guittot
2017-10-31 15:01 ` Peter Zijlstra
2017-10-31 16:38 ` Vincent Guittot
2017-11-16 14:09 ` [PATCH v3] sched: Update runnable propagation rule Vincent Guittot
2017-11-16 14:21 ` [PATCH v4] " Vincent Guittot
2017-12-06 11:40 ` Peter Zijlstra
2017-12-06 17:10 ` Ingo Molnar
2017-12-06 20:29 ` [tip:sched/core] sched/fair: Update and fix the " tip-bot for Vincent Guittot
2017-09-01 13:21 ` [PATCH -v2 13/18] sched/fair: Propagate an effective runnable_load_avg Peter Zijlstra
2017-10-02 17:46 ` Dietmar Eggemann
2017-10-03 8:50 ` Peter Zijlstra
2017-10-03 9:29 ` Dietmar Eggemann
2017-10-03 12:26 ` Dietmar Eggemann
2017-09-01 13:21 ` [PATCH -v2 14/18] sched/fair: Synchonous PELT detach on load-balance migrate Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 15/18] sched/fair: Align PELT windows between cfs_rq and its se Peter Zijlstra
2017-10-04 19:27 ` Dietmar Eggemann
2017-10-06 13:02 ` Peter Zijlstra
2017-10-09 12:15 ` Dietmar Eggemann
2017-10-09 12:19 ` Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 16/18] sched/fair: More accurate async detach Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 17/18] sched/fair: Calculate runnable_weight slightly differently Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 18/18] sched/fair: Update calc_group_*() comments Peter Zijlstra
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