From: Rik van Riel <riel@surriel.com>
To: linux-kernel@vger.kernel.org
Cc: kernel-team@fb.com, pjt@google.com, dietmar.eggemann@arm.com,
peterz@infradead.org, mingo@redhat.com, morten.rasmussen@arm.com,
tglx@linutronix.de, mgorman@techsingularity.net,
vincent.guittot@linaro.org, Rik van Riel <riel@surriel.com>
Subject: [PATCH 10/15] sched,fair: add helper functions for flattened runqueue
Date: Wed, 21 Aug 2019 22:17:35 -0400 [thread overview]
Message-ID: <20190822021740.15554-11-riel@surriel.com> (raw)
In-Reply-To: <20190822021740.15554-1-riel@surriel.com>
Add helper functions to make the flattened runqueue patch a little smaller.
The task_se_h_weight function is similar to task_se_h_load, but scales the
task weight by the group weight, without taking the task's duty cycle into
account.
The task_se_in_cgroup helper is functionally identical to parent_entity,
but directly calling a function with that name obscures what the other
code is trying to use it for, and would make the code harder to understand.
Signed-off-by: Rik van Riel <riel@surriel.com>
---
kernel/sched/fair.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7b0d95f2e3a8..29bfa7379dec 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -243,6 +243,7 @@ static u64 __calc_delta(u64 delta_exec, unsigned long weight, struct load_weight
const struct sched_class fair_sched_class;
static unsigned long task_se_h_load(struct sched_entity *se);
+static unsigned long task_se_h_weight(struct sched_entity *se);
/**************************************************************
* CFS operations on generic schedulable entities:
@@ -431,6 +432,12 @@ static inline struct sched_entity *parent_entity(struct sched_entity *se)
return se->parent;
}
+/* Is this (task) sched_entity in a non-root cgroup? */
+static inline bool task_se_in_cgroup(struct sched_entity *se)
+{
+ return parent_entity(se);
+}
+
static void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
@@ -513,6 +520,11 @@ static inline struct sched_entity *parent_entity(struct sched_entity *se)
return NULL;
}
+static inline bool task_se_in_cgroup(struct sched_entity *se)
+{
+ return false;
+}
+
static inline void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
@@ -7837,6 +7849,20 @@ static void update_cfs_rq_h_load(struct cfs_rq *cfs_rq)
}
}
+static unsigned long task_se_h_weight(struct sched_entity *se)
+{
+ struct cfs_rq *cfs_rq;
+
+ if (!task_se_in_cgroup(se))
+ return se->load.weight;
+
+ cfs_rq = group_cfs_rq_of_parent(se);
+ update_cfs_rq_h_load(cfs_rq);
+
+ /* Reduce the load.weight by the h_load of the group the task is in. */
+ return (cfs_rq->h_load * se->load.weight) >> SCHED_FIXEDPOINT_SHIFT;
+}
+
static unsigned long task_se_h_load(struct sched_entity *se)
{
struct cfs_rq *cfs_rq = group_cfs_rq_of_parent(se);
@@ -7873,6 +7899,11 @@ static unsigned long task_se_h_load(struct sched_entity *se)
{
return se->avg.load_avg;
}
+
+static unsigned long task_se_h_weight(struct sched_entity *se)
+{
+ return se->load.weight;
+}
#endif
/********** Helpers for find_busiest_group ************************/
--
2.20.1
next prev parent reply other threads:[~2019-08-22 2:19 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-22 2:17 [PATCH RFC v4 0/15] sched,fair: flatten CPU controller runqueues Rik van Riel
2019-08-22 2:17 ` [PATCH 01/15] sched: introduce task_se_h_load helper Rik van Riel
2019-08-23 18:13 ` Dietmar Eggemann
2019-08-24 0:05 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 02/15] sched: change /proc/sched_debug fields Rik van Riel
2019-08-22 2:17 ` [PATCH 03/15] sched,fair: redefine runnable_load_avg as the sum of task_h_load Rik van Riel
2019-08-28 13:50 ` Vincent Guittot
2019-08-28 14:47 ` Rik van Riel
2019-08-28 15:02 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 04/15] sched,fair: move runnable_load_avg to cfs_rq Rik van Riel
2019-08-22 2:17 ` [PATCH 05/15] sched,fair: remove cfs_rqs from leaf_cfs_rq_list bottom up Rik van Riel
2019-08-28 14:09 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 06/15] sched,cfs: use explicit cfs_rq of parent se helper Rik van Riel
2019-08-28 13:53 ` Vincent Guittot
2019-08-28 15:28 ` Rik van Riel
2019-08-28 16:34 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 07/15] sched,cfs: fix zero length timeslice calculation Rik van Riel
2019-08-28 16:59 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 08/15] sched,fair: simplify timeslice length code Rik van Riel
2019-08-28 17:32 ` Vincent Guittot
2019-08-28 23:18 ` Rik van Riel
2019-08-29 14:02 ` Vincent Guittot
2019-08-29 16:00 ` Rik van Riel
2019-08-30 6:41 ` Vincent Guittot
2019-08-30 15:01 ` Rik van Riel
2019-09-02 7:51 ` Vincent Guittot
2019-09-02 17:47 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 09/15] sched,fair: refactor enqueue/dequeue_entity Rik van Riel
2019-09-03 15:38 ` Vincent Guittot
2019-09-03 20:27 ` Rik van Riel
2019-09-04 6:44 ` Vincent Guittot
2019-08-22 2:17 ` Rik van Riel [this message]
2019-08-22 2:17 ` [PATCH 11/15] sched,fair: flatten hierarchical runqueues Rik van Riel
2019-08-23 18:14 ` Dietmar Eggemann
2019-08-24 1:16 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 12/15] sched,fair: flatten update_curr functionality Rik van Riel
2019-08-27 10:37 ` Dietmar Eggemann
2019-08-22 2:17 ` [PATCH 13/15] sched,fair: propagate sum_exec_runtime up the hierarchy Rik van Riel
2019-08-28 7:51 ` Dietmar Eggemann
2019-08-28 13:14 ` Rik van Riel
2019-08-29 17:20 ` Dietmar Eggemann
2019-08-29 18:06 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 14/15] sched,fair: ramp up task_se_h_weight quickly Rik van Riel
2019-08-22 2:17 ` [PATCH 15/15] sched,fair: scale vdiff in wakeup_preempt_entity Rik van Riel
2019-09-02 10:53 ` [PATCH RFC v4 0/15] sched,fair: flatten CPU controller runqueues Dietmar Eggemann
2019-09-03 1:44 ` Rik van Riel
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