linux-kernel - [PATCH 10/40] autonuma: mm_autonuma and sched

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Date:	Thu, 28 Jun 2012 14:55:50 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 10/40] autonuma: mm_autonuma and sched_autonuma data structures

Define the two data structures that collect the per-process (in the
mm) and per-thread (in the task_struct) statistical information that
are the input of the CPU follow memory algorithms in the NUMA
scheduler.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 include/linux/autonuma_types.h |   68 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 68 insertions(+), 0 deletions(-)
 create mode 100644 include/linux/autonuma_types.h

diff --git a/include/linux/autonuma_types.h b/include/linux/autonuma_types.h
new file mode 100644
index 0000000..9e697e3
--- /dev/null
+++ b/include/linux/autonuma_types.h
@@ -0,0 +1,68 @@
+#ifndef _LINUX_AUTONUMA_TYPES_H
+#define _LINUX_AUTONUMA_TYPES_H
+
+#ifdef CONFIG_AUTONUMA
+
+#include <linux/numa.h>
+
+/*
+ * Per-mm (process) structure dynamically allocated only if autonuma
+ * is not impossible. This links the mm to scan into the
+ * knuma_scand.mm_head and it contains the NUMA memory placement
+ * statistics for the process (generated by knuma_scand).
+ */
+struct mm_autonuma {
+	/* list node to link the "mm" into the knuma_scand.mm_head */
+	struct list_head mm_node;
+	struct mm_struct *mm;
+	unsigned long mm_numa_fault_pass; /* zeroed from here during allocation */
+	unsigned long mm_numa_fault_tot;
+	unsigned long mm_numa_fault[0];
+};
+
+extern int alloc_mm_autonuma(struct mm_struct *mm);
+extern void free_mm_autonuma(struct mm_struct *mm);
+extern void __init mm_autonuma_init(void);
+
+/*
+ * Per-task (thread) structure dynamically allocated only if autonuma
+ * is not impossible. This contains the preferred autonuma_node where
+ * the userland thread should be scheduled into (only relevant if
+ * tsk->mm is not null) and the per-thread NUMA accesses statistics
+ * (generated by the NUMA hinting page faults).
+ */
+struct task_autonuma {
+	int autonuma_node;
+	/* zeroed from the below field during allocation */
+	unsigned long task_numa_fault_pass;
+	unsigned long task_numa_fault_tot;
+	unsigned long task_numa_fault[0];
+};
+
+extern int alloc_task_autonuma(struct task_struct *tsk,
+			       struct task_struct *orig,
+			       int node);
+extern void __init task_autonuma_init(void);
+extern void free_task_autonuma(struct task_struct *tsk);
+
+#else /* CONFIG_AUTONUMA */
+
+static inline int alloc_mm_autonuma(struct mm_struct *mm)
+{
+	return 0;
+}
+static inline void free_mm_autonuma(struct mm_struct *mm) {}
+static inline void mm_autonuma_init(void) {}
+
+static inline int alloc_task_autonuma(struct task_struct *tsk,
+				      struct task_struct *orig,
+				      int node)
+{
+	return 0;
+}
+static inline void task_autonuma_init(void) {}
+static inline void free_task_autonuma(struct task_struct *tsk) {}
+
+#endif /* CONFIG_AUTONUMA */
+
+#endif /* _LINUX_AUTONUMA_TYPES_H */
--
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