[mirror_ubuntu-zesty-kernel.git] / include / linux / topology.h

/*
 * include/linux/topology.h
 *
 * Written by: Matthew Dobson, IBM Corporation
 *
 * Copyright (C) 2002, IBM Corp.
 *
 * All rights reserved.          
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <colpatch@us.ibm.com>
 */
#ifndef _LINUX_TOPOLOGY_H
#define _LINUX_TOPOLOGY_H

#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <asm/topology.h>

#ifndef node_has_online_mem
#define node_has_online_mem(nid) (1)
#endif

#ifndef nr_cpus_node
#define nr_cpus_node(node)							\
	({									\
		cpumask_t __tmp__;						\
		__tmp__ = node_to_cpumask(node);				\
		cpus_weight(__tmp__);						\
	})
#endif

#define for_each_node_with_cpus(node)						\
	for_each_online_node(node)						\
		if (nr_cpus_node(node))

#ifndef node_distance
/* Conform to ACPI 2.0 SLIT distance definitions */
#define LOCAL_DISTANCE		10
#define REMOTE_DISTANCE		20
#define node_distance(from,to)	((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
#endif
#ifndef RECLAIM_DISTANCE
/*
 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
 * (in whatever arch specific measurement units returned by node_distance())
 * then switch on zone reclaim on boot.
 */
#define RECLAIM_DISTANCE 20
#endif
#ifndef PENALTY_FOR_NODE_WITH_CPUS
#define PENALTY_FOR_NODE_WITH_CPUS	(1)
#endif

/*
 * Below are the 3 major initializers used in building sched_domains:
 * SD_SIBLING_INIT, for SMT domains
 * SD_CPU_INIT, for SMP domains
 * SD_NODE_INIT, for NUMA domains
 *
 * Any architecture that cares to do any tuning to these values should do so
 * by defining their own arch-specific initializer in include/asm/topology.h.
 * A definition there will automagically override these default initializers
 * and allow arch-specific performance tuning of sched_domains.
 */
#ifdef CONFIG_SCHED_SMT
/* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
 * so can't we drop this in favor of CONFIG_SCHED_SMT?
 */
#define ARCH_HAS_SCHED_WAKE_IDLE
/* Common values for SMT siblings */
#ifndef SD_SIBLING_INIT
#define SD_SIBLING_INIT (struct sched_domain) {		\
	.span			= CPU_MASK_NONE,	\
	.parent			= NULL,			\
	.groups			= NULL,			\
	.min_interval		= 1,			\
	.max_interval		= 2,			\
	.busy_factor		= 8,			\
	.imbalance_pct		= 110,			\
	.cache_nice_tries	= 0,			\
	.per_cpu_gain		= 25,			\
	.busy_idx		= 0,			\
	.idle_idx		= 0,			\
	.newidle_idx		= 1,			\
	.wake_idx		= 0,			\
	.forkexec_idx		= 0,			\
	.flags			= SD_LOAD_BALANCE	\
				| SD_BALANCE_NEWIDLE	\
				| SD_BALANCE_EXEC	\
				| SD_WAKE_AFFINE	\
				| SD_WAKE_IDLE		\
				| SD_SHARE_CPUPOWER,	\
	.last_balance		= jiffies,		\
	.balance_interval	= 1,			\
	.nr_balance_failed	= 0,			\
}
#endif
#endif /* CONFIG_SCHED_SMT */

/* Common values for CPUs */
#ifndef SD_CPU_INIT
#define SD_CPU_INIT (struct sched_domain) {		\
	.span			= CPU_MASK_NONE,	\
	.parent			= NULL,			\
	.groups			= NULL,			\
	.min_interval		= 1,			\
	.max_interval		= 4,			\
	.busy_factor		= 64,			\
	.imbalance_pct		= 125,			\
	.cache_nice_tries	= 1,			\
	.per_cpu_gain		= 100,			\
	.busy_idx		= 2,			\
	.idle_idx		= 1,			\
	.newidle_idx		= 2,			\
	.wake_idx		= 1,			\
	.forkexec_idx		= 1,			\
	.flags			= SD_LOAD_BALANCE	\
				| SD_BALANCE_NEWIDLE	\
				| SD_BALANCE_EXEC	\
				| SD_WAKE_AFFINE,	\
	.last_balance		= jiffies,		\
	.balance_interval	= 1,			\
	.nr_balance_failed	= 0,			\
}
#endif

/* sched_domains SD_ALLNODES_INIT for NUMA machines */
#define SD_ALLNODES_INIT (struct sched_domain) {	\
	.span			= CPU_MASK_NONE,	\
	.parent			= NULL,			\
	.groups			= NULL,			\
	.min_interval		= 64,			\
	.max_interval		= 64*num_online_cpus(),	\
	.busy_factor		= 128,			\
	.imbalance_pct		= 133,			\
	.cache_hot_time		= (10*1000000),		\
	.cache_nice_tries	= 1,			\
	.busy_idx		= 3,			\
	.idle_idx		= 3,			\
	.newidle_idx		= 0, /* unused */	\
	.wake_idx		= 0, /* unused */	\
	.forkexec_idx		= 0, /* unused */	\
	.per_cpu_gain		= 100,			\
	.flags			= SD_LOAD_BALANCE,	\
	.last_balance		= jiffies,		\
	.balance_interval	= 64,			\
	.nr_balance_failed	= 0,			\
}

#ifdef CONFIG_NUMA
#ifndef SD_NODE_INIT
#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
#endif
#endif /* CONFIG_NUMA */

#endif /* _LINUX_TOPOLOGY_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/linux/topology.h
	3	*
	4	* Written by: Matthew Dobson, IBM Corporation
	5	*
	6	* Copyright (C) 2002, IBM Corp.
	7	*
	8	* All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	18	* NON INFRINGEMENT. See the GNU General Public License for more
	19	* details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*
	25	* Send feedback to <colpatch@us.ibm.com>
	26	*/
	27	#ifndef _LINUX_TOPOLOGY_H
	28	#define _LINUX_TOPOLOGY_H
	29
	30	#include <linux/cpumask.h>
	31	#include <linux/bitops.h>
	32	#include <linux/mmzone.h>
	33	#include <linux/smp.h>
	34	#include <asm/topology.h>
	35
	36	#ifndef node_has_online_mem
	37	#define node_has_online_mem(nid) (1)
	38	#endif
	39
	40	#ifndef nr_cpus_node
	41	#define nr_cpus_node(node) \
	42	({ \
	43	cpumask_t __tmp__; \
	44	__tmp__ = node_to_cpumask(node); \
	45	cpus_weight(__tmp__); \
	46	})
	47	#endif
	48
	49	#define for_each_node_with_cpus(node) \
	50	for_each_online_node(node) \
	51	if (nr_cpus_node(node))
	52
	53	#ifndef node_distance
	54	/* Conform to ACPI 2.0 SLIT distance definitions */
	55	#define LOCAL_DISTANCE 10
	56	#define REMOTE_DISTANCE 20
	57	#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
	58	#endif
9eeff239 CL	59	#ifndef RECLAIM_DISTANCE
	60	/*
	61	* If the distance between nodes in a system is larger than RECLAIM_DISTANCE
	62	* (in whatever arch specific measurement units returned by node_distance())
	63	* then switch on zone reclaim on boot.
	64	*/
	65	#define RECLAIM_DISTANCE 20
	66	#endif
1da177e4 LT	67	#ifndef PENALTY_FOR_NODE_WITH_CPUS
	68	#define PENALTY_FOR_NODE_WITH_CPUS (1)
	69	#endif
	70
	71	/*
	72	* Below are the 3 major initializers used in building sched_domains:
	73	* SD_SIBLING_INIT, for SMT domains
	74	* SD_CPU_INIT, for SMP domains
	75	* SD_NODE_INIT, for NUMA domains
	76	*
	77	* Any architecture that cares to do any tuning to these values should do so
	78	* by defining their own arch-specific initializer in include/asm/topology.h.
	79	* A definition there will automagically override these default initializers
	80	* and allow arch-specific performance tuning of sched_domains.
	81	*/
	82	#ifdef CONFIG_SCHED_SMT
	83	/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
	84	* so can't we drop this in favor of CONFIG_SCHED_SMT?
	85	*/
	86	#define ARCH_HAS_SCHED_WAKE_IDLE
	87	/* Common values for SMT siblings */
	88	#ifndef SD_SIBLING_INIT
	89	#define SD_SIBLING_INIT (struct sched_domain) { \
	90	.span = CPU_MASK_NONE, \
	91	.parent = NULL, \
	92	.groups = NULL, \
	93	.min_interval = 1, \
	94	.max_interval = 2, \
	95	.busy_factor = 8, \
	96	.imbalance_pct = 110, \
1da177e4 LT	97	.cache_nice_tries = 0, \
1da177e4 LT	98	.per_cpu_gain = 25, \
7897986b NP	99	.busy_idx = 0, \
7897986b NP	100	.idle_idx = 0, \
687f1661	101	.newidle_idx = 1, \
7897986b	102	.wake_idx = 0, \
147cbb4b	103	.forkexec_idx = 0, \
1da177e4 LT	104	.flags = SD_LOAD_BALANCE \
	105	\| SD_BALANCE_NEWIDLE \
	106	\| SD_BALANCE_EXEC \
	107	\| SD_WAKE_AFFINE \
	108	\| SD_WAKE_IDLE \
	109	\| SD_SHARE_CPUPOWER, \
	110	.last_balance = jiffies, \
	111	.balance_interval = 1, \
	112	.nr_balance_failed = 0, \
	113	}
	114	#endif
	115	#endif /* CONFIG_SCHED_SMT */
	116
	117	/* Common values for CPUs */
	118	#ifndef SD_CPU_INIT
	119	#define SD_CPU_INIT (struct sched_domain) { \
	120	.span = CPU_MASK_NONE, \
	121	.parent = NULL, \
	122	.groups = NULL, \
	123	.min_interval = 1, \
	124	.max_interval = 4, \
	125	.busy_factor = 64, \
	126	.imbalance_pct = 125, \
1da177e4 LT	127	.cache_nice_tries = 1, \
1da177e4 LT	128	.per_cpu_gain = 100, \
7897986b	129	.busy_idx = 2, \
687f1661 NP	130	.idle_idx = 1, \
687f1661 NP	131	.newidle_idx = 2, \
7897986b	132	.wake_idx = 1, \
687f1661	133	.forkexec_idx = 1, \
1da177e4 LT	134	.flags = SD_LOAD_BALANCE \
	135	\| SD_BALANCE_NEWIDLE \
	136	\| SD_BALANCE_EXEC \
687f1661	137	\| SD_WAKE_AFFINE, \
1da177e4 LT	138	.last_balance = jiffies, \
	139	.balance_interval = 1, \
	140	.nr_balance_failed = 0, \
	141	}
	142	#endif
	143
9c1cfda2 JH	144	/* sched_domains SD_ALLNODES_INIT for NUMA machines */
	145	#define SD_ALLNODES_INIT (struct sched_domain) { \
	146	.span = CPU_MASK_NONE, \
	147	.parent = NULL, \
	148	.groups = NULL, \
	149	.min_interval = 64, \
	150	.max_interval = 64*num_online_cpus(), \
	151	.busy_factor = 128, \
	152	.imbalance_pct = 133, \
	153	.cache_hot_time = (10*1000000), \
	154	.cache_nice_tries = 1, \
	155	.busy_idx = 3, \
	156	.idle_idx = 3, \
	157	.newidle_idx = 0, /* unused */ \
	158	.wake_idx = 0, /* unused */ \
	159	.forkexec_idx = 0, /* unused */ \
	160	.per_cpu_gain = 100, \
	161	.flags = SD_LOAD_BALANCE, \
	162	.last_balance = jiffies, \
	163	.balance_interval = 64, \
	164	.nr_balance_failed = 0, \
	165	}
	166
1da177e4 LT	167	#ifdef CONFIG_NUMA
	168	#ifndef SD_NODE_INIT
	169	#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
	170	#endif
	171	#endif /* CONFIG_NUMA */
	172
	173	#endif /* _LINUX_TOPOLOGY_H */