100fdaee70
Impact: change task balancing to save power more agressively
Add SD_BALANCE_NEWIDLE flag at MC level and CPU level
if sched_mc is set. This helps power savings and
will not affect performance when sched_mc=0
Ingo and Mike Galbraith have optimised the SD flags by
removing SD_BALANCE_NEWIDLE at MC and CPU level. This
helps performance but hurts power savings since this
slows down task consolidation by reducing the number
of times load_balance is run.
sched: fine-tune SD_MC_INIT
commit 1480098470
Author: Mike Galbraith <efault@gmx.de>
Date: Fri Nov 7 15:26:50 2008 +0100
sched: re-tune balancing -- revert
commit 9fcd18c9e6
Author: Ingo Molnar <mingo@elte.hu>
Date: Wed Nov 5 16:52:08 2008 +0100
This patch selectively enables SD_BALANCE_NEWIDLE flag
only when sched_mc is set to 1 or 2. This helps power savings
by task consolidation and also does not hurt performance at
sched_mc=0 where all power saving optimisations are turned off.
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
198 lines
5.4 KiB
C
198 lines
5.4 KiB
C
/*
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* include/linux/topology.h
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*
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* Written by: Matthew Dobson, IBM Corporation
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*/
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#ifndef _LINUX_TOPOLOGY_H
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#define _LINUX_TOPOLOGY_H
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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#include <linux/mmzone.h>
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#include <linux/smp.h>
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#include <asm/topology.h>
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#ifndef node_has_online_mem
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#define node_has_online_mem(nid) (1)
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#endif
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#ifndef nr_cpus_node
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#define nr_cpus_node(node) \
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({ \
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node_to_cpumask_ptr(__tmp__, node); \
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cpus_weight(*__tmp__); \
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})
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#endif
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#define for_each_node_with_cpus(node) \
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for_each_online_node(node) \
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if (nr_cpus_node(node))
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int arch_update_cpu_topology(void);
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/* Conform to ACPI 2.0 SLIT distance definitions */
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#define LOCAL_DISTANCE 10
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#define REMOTE_DISTANCE 20
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#ifndef node_distance
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#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
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#endif
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#ifndef RECLAIM_DISTANCE
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/*
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* If the distance between nodes in a system is larger than RECLAIM_DISTANCE
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* (in whatever arch specific measurement units returned by node_distance())
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* then switch on zone reclaim on boot.
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*/
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#define RECLAIM_DISTANCE 20
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#endif
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#ifndef PENALTY_FOR_NODE_WITH_CPUS
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#define PENALTY_FOR_NODE_WITH_CPUS (1)
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#endif
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/*
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* Below are the 3 major initializers used in building sched_domains:
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* SD_SIBLING_INIT, for SMT domains
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* SD_CPU_INIT, for SMP domains
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* SD_NODE_INIT, for NUMA domains
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*
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* Any architecture that cares to do any tuning to these values should do so
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* by defining their own arch-specific initializer in include/asm/topology.h.
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* A definition there will automagically override these default initializers
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* and allow arch-specific performance tuning of sched_domains.
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* (Only non-zero and non-null fields need be specified.)
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*/
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#ifdef CONFIG_SCHED_SMT
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/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
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* so can't we drop this in favor of CONFIG_SCHED_SMT?
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*/
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#define ARCH_HAS_SCHED_WAKE_IDLE
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/* Common values for SMT siblings */
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#ifndef SD_SIBLING_INIT
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#define SD_SIBLING_INIT (struct sched_domain) { \
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.min_interval = 1, \
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.max_interval = 2, \
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.busy_factor = 64, \
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.imbalance_pct = 110, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_NEWIDLE \
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| SD_BALANCE_FORK \
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| SD_BALANCE_EXEC \
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| SD_WAKE_AFFINE \
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| SD_WAKE_BALANCE \
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| SD_SHARE_CPUPOWER, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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}
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#endif
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#endif /* CONFIG_SCHED_SMT */
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#ifdef CONFIG_SCHED_MC
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/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
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#ifndef SD_MC_INIT
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#define SD_MC_INIT (struct sched_domain) { \
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.min_interval = 1, \
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.max_interval = 4, \
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.busy_factor = 64, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 1, \
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.busy_idx = 2, \
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.wake_idx = 1, \
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.forkexec_idx = 1, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_FORK \
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| SD_BALANCE_EXEC \
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| SD_WAKE_AFFINE \
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| SD_WAKE_BALANCE \
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| SD_SHARE_PKG_RESOURCES\
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| sd_balance_for_mc_power()\
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| sd_power_saving_flags(),\
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.last_balance = jiffies, \
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.balance_interval = 1, \
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}
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#endif
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#endif /* CONFIG_SCHED_MC */
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/* Common values for CPUs */
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#ifndef SD_CPU_INIT
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#define SD_CPU_INIT (struct sched_domain) { \
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.min_interval = 1, \
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.max_interval = 4, \
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.busy_factor = 64, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 1, \
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.busy_idx = 2, \
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.idle_idx = 1, \
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.newidle_idx = 2, \
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.wake_idx = 1, \
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.forkexec_idx = 1, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_EXEC \
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| SD_BALANCE_FORK \
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| SD_WAKE_AFFINE \
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| SD_WAKE_BALANCE \
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| sd_balance_for_package_power()\
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| sd_power_saving_flags(),\
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.last_balance = jiffies, \
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.balance_interval = 1, \
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}
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#endif
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/* sched_domains SD_ALLNODES_INIT for NUMA machines */
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#define SD_ALLNODES_INIT (struct sched_domain) { \
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.min_interval = 64, \
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.max_interval = 64*num_online_cpus(), \
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.busy_factor = 128, \
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.imbalance_pct = 133, \
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.cache_nice_tries = 1, \
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.busy_idx = 3, \
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.idle_idx = 3, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_NEWIDLE \
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| SD_WAKE_AFFINE \
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| SD_SERIALIZE, \
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.last_balance = jiffies, \
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.balance_interval = 64, \
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}
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#ifdef CONFIG_NUMA
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#ifndef SD_NODE_INIT
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#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
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#endif
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#endif /* CONFIG_NUMA */
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#ifndef topology_physical_package_id
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#define topology_physical_package_id(cpu) ((void)(cpu), -1)
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#endif
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#ifndef topology_core_id
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#define topology_core_id(cpu) ((void)(cpu), 0)
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#endif
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#ifndef topology_thread_siblings
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#define topology_thread_siblings(cpu) cpumask_of_cpu(cpu)
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#endif
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#ifndef topology_core_siblings
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#define topology_core_siblings(cpu) cpumask_of_cpu(cpu)
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#endif
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#endif /* _LINUX_TOPOLOGY_H */
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