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Date: Thu, 18 Nov 2010 14:13:13 GMT
From: tip-bot for Paul Turner <pjt@...gle.com>
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: Allow update_cfs_load() to update global load
Commit-ID: d6b5591829bd348a5fbe1c428d28dea00621cdba
Gitweb: http://git.kernel.org/tip/d6b5591829bd348a5fbe1c428d28dea00621cdba
Author: Paul Turner <pjt@...gle.com>
AuthorDate: Mon, 15 Nov 2010 15:47:09 -0800
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 18 Nov 2010 13:27:50 +0100
sched: Allow update_cfs_load() to update global load
Refactor the global load updates from update_shares_cpu() so that
update_cfs_load() can update global load when it is more than ~10%
out of sync.
The new global_load parameter allows us to force an update, regardless of
the error factor so that we can synchronize w/ update_shares().
Signed-off-by: Paul Turner <pjt@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20101115234938.377473595@...gle.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
kernel/sched_fair.c | 44 +++++++++++++++++++++++++++++---------------
1 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index e7e2f08..390ce30 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -539,7 +539,7 @@ static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
return calc_delta_fair(sched_slice(cfs_rq, se), se);
}
-static void update_cfs_load(struct cfs_rq *cfs_rq);
+static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update);
static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta);
/*
@@ -565,7 +565,7 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq->load_unacc_exec_time += delta_exec;
if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) {
- update_cfs_load(cfs_rq);
+ update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, 0);
}
#endif
@@ -704,7 +704,22 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
}
#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED
-static void update_cfs_load(struct cfs_rq *cfs_rq)
+static void update_cfs_rq_load_contribution(struct cfs_rq *cfs_rq,
+ int global_update)
+{
+ struct task_group *tg = cfs_rq->tg;
+ long load_avg;
+
+ load_avg = div64_u64(cfs_rq->load_avg, cfs_rq->load_period+1);
+ load_avg -= cfs_rq->load_contribution;
+
+ if (global_update || abs(load_avg) > cfs_rq->load_contribution / 8) {
+ atomic_add(load_avg, &tg->load_weight);
+ cfs_rq->load_contribution += load_avg;
+ }
+}
+
+static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
{
u64 period = sysctl_sched_shares_window;
u64 now, delta;
@@ -731,6 +746,11 @@ static void update_cfs_load(struct cfs_rq *cfs_rq)
cfs_rq->load_avg += delta * load;
}
+ /* consider updating load contribution on each fold or truncate */
+ if (global_update || cfs_rq->load_period > period
+ || !cfs_rq->load_period)
+ update_cfs_rq_load_contribution(cfs_rq, global_update);
+
while (cfs_rq->load_period > period) {
/*
* Inline assembly required to prevent the compiler
@@ -790,7 +810,7 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta)
reweight_entity(cfs_rq_of(se), se, shares);
}
#else /* CONFIG_FAIR_GROUP_SCHED */
-static inline void update_cfs_load(struct cfs_rq *cfs_rq)
+static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
{
}
@@ -920,7 +940,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
* Update run-time statistics of the 'current'.
*/
update_curr(cfs_rq);
- update_cfs_load(cfs_rq);
+ update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, se->load.weight);
account_entity_enqueue(cfs_rq, se);
@@ -981,7 +1001,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
if (se != cfs_rq->curr)
__dequeue_entity(cfs_rq, se);
se->on_rq = 0;
- update_cfs_load(cfs_rq);
+ update_cfs_load(cfs_rq, 0);
account_entity_dequeue(cfs_rq, se);
update_min_vruntime(cfs_rq);
update_cfs_shares(cfs_rq, 0);
@@ -1216,7 +1236,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
for_each_sched_entity(se) {
struct cfs_rq *cfs_rq = cfs_rq_of(se);
- update_cfs_load(cfs_rq);
+ update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, 0);
}
@@ -1246,7 +1266,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
for_each_sched_entity(se) {
struct cfs_rq *cfs_rq = cfs_rq_of(se);
- update_cfs_load(cfs_rq);
+ update_cfs_load(cfs_rq, 0);
update_cfs_shares(cfs_rq, 0);
}
@@ -2052,7 +2072,6 @@ static int update_shares_cpu(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;
@@ -2063,12 +2082,7 @@ static int update_shares_cpu(struct task_group *tg, int cpu)
raw_spin_lock_irqsave(&rq->lock, flags);
update_rq_clock(rq);
- update_cfs_load(cfs_rq);
-
- 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;
+ update_cfs_load(cfs_rq, 1);
/*
* We need to update shares after updating tg->load_weight in
--
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