From da84d96176729fb48a8458561e5d8647103168b8 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 15 Oct 2007 17:00:18 +0200
Subject: [PATCH] sched: reintroduce cache-hot affinity

reintroduce a simplified version of cache-hot/cold scheduling
affinity. This improves performance with certain SMP workloads,
such as sysbench.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/sched.h |  1 +
 kernel/sched.c        | 27 +++++++++++++++++++++++++++
 kernel/sched_fair.c   |  2 ++
 kernel/sysctl.c       |  8 ++++++++
 4 files changed, 38 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8be5b57768c0..fcc9a5ada1a2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1415,6 +1415,7 @@ extern unsigned int sysctl_sched_wakeup_granularity;
 extern unsigned int sysctl_sched_batch_wakeup_granularity;
 extern unsigned int sysctl_sched_child_runs_first;
 extern unsigned int sysctl_sched_features;
+extern unsigned int sysctl_sched_migration_cost;
 #endif
 
 extern unsigned int sysctl_sched_compat_yield;
diff --git a/kernel/sched.c b/kernel/sched.c
index 791dd08c692f..089d8b12ab76 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2118,6 +2118,17 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
 	check_preempt_curr(this_rq, p);
 }
 
+/*
+ * Is this task likely cache-hot:
+ */
+static inline int
+task_hot(struct task_struct *p, unsigned long long now, struct sched_domain *sd)
+{
+	s64 delta = now - p->se.exec_start;
+
+	return delta < (long long)sysctl_sched_migration_cost;
+}
+
 /*
  * can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
  */
@@ -2139,6 +2150,22 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
 	if (task_running(rq, p))
 		return 0;
 
+	/*
+	 * Aggressive migration if:
+	 * 1) task is cache cold, or
+	 * 2) too many balance attempts have failed.
+	 */
+
+	if (sd->nr_balance_failed > sd->cache_nice_tries) {
+#ifdef CONFIG_SCHEDSTATS
+		if (task_hot(p, rq->clock, sd))
+			schedstat_inc(sd, lb_hot_gained[idle]);
+#endif
+		return 1;
+	}
+
+	if (task_hot(p, rq->clock, sd))
+		return 0;
 	return 1;
 }
 
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index cea1fa32b3f4..a17b785d7000 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -74,6 +74,8 @@ const_debug unsigned int sysctl_sched_batch_wakeup_granularity = 10000000UL;
  */
 const_debug unsigned int sysctl_sched_wakeup_granularity = 10000000UL;
 
+const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
+
 /**************************************************************
  * CFS operations on generic schedulable entities:
  */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 230ca4eb57fe..ec14aa8ac51f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -277,6 +277,14 @@ static ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_migration_cost",
+		.data		= &sysctl_sched_migration_cost,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
 #endif
 	{
 		.ctl_name	= CTL_UNNUMBERED,
-- 
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