linux-kernel - [tip:numa/core] sched/numa: Simplify task_numa

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Date:	Thu, 18 Oct 2012 10:01:47 -0700
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@...nel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de
Subject: [tip:numa/core] sched/numa: Simplify task_numa_fault()

Commit-ID:  f3bd8842a897685269b3fa48ad6f9d5590be67ab
Gitweb:     http://git.kernel.org/tip/f3bd8842a897685269b3fa48ad6f9d5590be67ab
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 10 Oct 2012 14:13:15 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 15 Oct 2012 12:30:16 +0200

sched/numa: Simplify task_numa_fault()

Also fix numa_scan_seq off by one.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-dvswxo34oaiibm06zyvrv0q5@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/sched.h |   11 +----------
 kernel/sched/core.c   |    2 +-
 kernel/sched/fair.c   |    9 ++++-----
 3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 99a70eb..c7f8656 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1608,16 +1608,7 @@ static inline int tsk_home_node(struct task_struct *p)
 }
 
 extern void task_numa_placement(void);
-extern void __task_numa_fault(int node);
-static inline void task_numa_fault(int node)
-{
-	struct task_struct *p = current;
-
-	if (likely(p->numa_faults))
-		p->numa_faults[node]++;
-	else
-		__task_numa_fault(node);
-}
+extern void task_numa_fault(int node);
 #else
 static inline int tsk_home_node(struct task_struct *p)
 {
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ff4a3bd..b370f2f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1543,7 +1543,7 @@ static void __sched_fork(struct task_struct *p)
 	p->node = -1;
 	p->node_stamp = 0ULL;
 	p->numa_scan_seq = p->mm ? p->mm->numa_scan_seq : 0;
-	p->numa_migrate_seq = p->mm ? p->mm->numa_scan_seq : 0;
+	p->numa_migrate_seq = p->mm ? p->mm->numa_scan_seq - 1 : 0;
 	p->numa_faults = NULL;
 #endif /* CONFIG_SCHED_NUMA */
 }
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 592291b..1a32930 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -823,18 +823,17 @@ unsigned int sysctl_sched_numa_settle_count = 2;
 /*
  * Got a PROT_NONE fault for a page on @node.
  */
-void __task_numa_fault(int node)
+void task_numa_fault(int node)
 {
 	struct task_struct *p = current;
 
-	if (!p->numa_faults) {
+	if (unlikely(!p->numa_faults)) {
 		p->numa_faults = kzalloc(sizeof(unsigned long) * nr_node_ids,
 					 GFP_KERNEL);
+		if (!p->numa_faults)
+			return;
 	}
 
-	if (!p->numa_faults)
-		return;
-
 	p->numa_faults[node]++;
 }
 
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