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Date: Thu, 18 Nov 2010 14:10:55 GMT
From: tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
a.p.zijlstra@...llo.nl, pjt@...gle.com, tglx@...utronix.de,
mingo@...e.hu
Subject: [tip:sched/core] sched: Make tg_shares_up() walk on-demand
Commit-ID: 9e3081ca61147b29f52fddb4f7c6b6b82ea5eb7a
Gitweb: http://git.kernel.org/tip/9e3081ca61147b29f52fddb4f7c6b6b82ea5eb7a
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Mon, 15 Nov 2010 15:47:02 -0800
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 18 Nov 2010 13:27:47 +0100
sched: Make tg_shares_up() walk on-demand
Make tg_shares_up() use the active cgroup list, this means we cannot
do a strict bottom-up walk of the hierarchy, but assuming its a very
wide tree with a small number of active groups it should be a win.
Signed-off-by: Paul Turner <pjt@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20101115234937.754159484@...gle.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
kernel/sched.c | 67 ---------------------------------------------------
kernel/sched_fair.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+), 67 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 22436dd..6268d2d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -279,13 +279,6 @@ static DEFINE_SPINLOCK(task_group_lock);
#ifdef CONFIG_FAIR_GROUP_SCHED
-#ifdef CONFIG_SMP
-static int root_task_group_empty(void)
-{
- return list_empty(&root_task_group.children);
-}
-#endif
-
# define INIT_TASK_GROUP_LOAD NICE_0_LOAD
/*
@@ -1546,48 +1539,6 @@ static unsigned long cpu_avg_load_per_task(int cpu)
#ifdef CONFIG_FAIR_GROUP_SCHED
-static void update_cfs_load(struct cfs_rq *cfs_rq, int lb);
-static void update_cfs_shares(struct cfs_rq *cfs_rq);
-
-/*
- * update tg->load_weight by folding this cpu's load_avg
- */
-static int tg_shares_up(struct task_group *tg, void *data)
-{
- long load_avg;
- struct cfs_rq *cfs_rq;
- unsigned long flags;
- int cpu = (long)data;
- struct rq *rq;
-
- if (!tg->se[cpu])
- return 0;
-
- rq = cpu_rq(cpu);
- cfs_rq = tg->cfs_rq[cpu];
-
- raw_spin_lock_irqsave(&rq->lock, flags);
-
- update_rq_clock(rq);
- update_cfs_load(cfs_rq, 1);
-
- load_avg = div64_u64(cfs_rq->load_avg, cfs_rq->load_period+1);
- load_avg -= cfs_rq->load_contribution;
-
- atomic_add(load_avg, &tg->load_weight);
- cfs_rq->load_contribution += load_avg;
-
- /*
- * We need to update shares after updating tg->load_weight in
- * order to adjust the weight of groups with long running tasks.
- */
- update_cfs_shares(cfs_rq);
-
- raw_spin_unlock_irqrestore(&rq->lock, flags);
-
- return 0;
-}
-
/*
* Compute the cpu's hierarchical load factor for each task group.
* This needs to be done in a top-down fashion because the load of a child
@@ -1611,29 +1562,11 @@ static int tg_load_down(struct task_group *tg, void *data)
return 0;
}
-static void update_shares(long cpu)
-{
- if (root_task_group_empty())
- return;
-
- /*
- * XXX: replace with an on-demand list
- */
-
- walk_tg_tree(tg_nop, tg_shares_up, (void *)cpu);
-}
-
static void update_h_load(long cpu)
{
walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
}
-#else
-
-static inline void update_shares(int cpu)
-{
-}
-
#endif
#ifdef CONFIG_PREEMPT
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0560e72..46ff658 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2004,6 +2004,60 @@ out:
}
#ifdef CONFIG_FAIR_GROUP_SCHED
+/*
+ * update tg->load_weight by folding this cpu's load_avg
+ */
+static int tg_shares_up(struct task_group *tg, int cpu)
+{
+ struct cfs_rq *cfs_rq;
+ unsigned long flags;
+ struct rq *rq;
+ long load_avg;
+
+ if (!tg->se[cpu])
+ return 0;
+
+ rq = cpu_rq(cpu);
+ cfs_rq = tg->cfs_rq[cpu];
+
+ raw_spin_lock_irqsave(&rq->lock, flags);
+
+ update_rq_clock(rq);
+ update_cfs_load(cfs_rq, 1);
+
+ load_avg = div64_u64(cfs_rq->load_avg, cfs_rq->load_period+1);
+ load_avg -= cfs_rq->load_contribution;
+ atomic_add(load_avg, &tg->load_weight);
+ cfs_rq->load_contribution += load_avg;
+
+ /*
+ * We need to update shares after updating tg->load_weight in
+ * order to adjust the weight of groups with long running tasks.
+ */
+ update_cfs_shares(cfs_rq);
+
+ raw_spin_unlock_irqrestore(&rq->lock, flags);
+
+ return 0;
+}
+
+static void update_shares(int cpu)
+{
+ struct cfs_rq *cfs_rq;
+ struct rq *rq = cpu_rq(cpu);
+
+ rcu_read_lock();
+ for_each_leaf_cfs_rq(rq, cfs_rq) {
+ struct task_group *tg = cfs_rq->tg;
+
+ do {
+ tg_shares_up(tg, cpu);
+ tg = tg->parent;
+ } while (tg);
+ }
+ rcu_read_unlock();
+}
+
static unsigned long
load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move,
@@ -2051,6 +2105,10 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
return max_load_move - rem_load_move;
}
#else
+static inline void update_shares(int cpu)
+{
+}
+
static unsigned long
load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move,
--
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