5c45bf279d
sysfs entries 'sched_mc_power_savings' and 'sched_smt_power_savings' in /sys/devices/system/cpu/ control the MC/SMT power savings policy for the scheduler. Based on the values (1-enable, 0-disable) for these controls, sched groups cpu power will be determined for different domains. When power savings policy is enabled and under light load conditions, scheduler will minimize the physical packages/cpu cores carrying the load and thus conserving power(with a perf impact based on the workload characteristics... see OLS 2005 CMP kernel scheduler paper for more details..) Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Con Kolivas <kernel@kolivas.org> Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
183 lines
5 KiB
C
183 lines
5 KiB
C
/*
|
|
* 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 \
|
|
| BALANCE_FOR_POWER, \
|
|
.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_SCHED_MC
|
|
#ifndef SD_MC_INIT
|
|
/* for now its same as SD_CPU_INIT.
|
|
* TBD: Tune Domain parameters!
|
|
*/
|
|
#define SD_MC_INIT SD_CPU_INIT
|
|
#endif
|
|
#endif
|
|
|
|
#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 */
|