182a85f8a1
Sysbench thinks SD_BALANCE_WAKE is too agressive and kbuild doesn't really mind too much, SD_BALANCE_NEWIDLE picks up most of the slack. On a dual socket, quad core, dual thread nehalem system: sysbench (--num_threads=16): SD_BALANCE_WAKE-: 13982 tx/s SD_BALANCE_WAKE+: 15688 tx/s kbuild (-j16): SD_BALANCE_WAKE-: 47.648295846 seconds time elapsed ( +- 0.312% ) SD_BALANCE_WAKE+: 47.608607360 seconds time elapsed ( +- 0.026% ) (same within noise) Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
233 lines
6.6 KiB
C
233 lines
6.6 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) cpumask_weight(cpumask_of_node(node))
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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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\
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.flags = 1*SD_LOAD_BALANCE \
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| 1*SD_BALANCE_NEWIDLE \
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| 1*SD_BALANCE_EXEC \
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| 1*SD_BALANCE_FORK \
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| 0*SD_BALANCE_WAKE \
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| 1*SD_WAKE_AFFINE \
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| 1*SD_SHARE_CPUPOWER \
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| 0*SD_POWERSAVINGS_BALANCE \
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| 0*SD_SHARE_PKG_RESOURCES \
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| 0*SD_SERIALIZE \
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| 0*SD_PREFER_SIBLING \
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, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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.smt_gain = 1178, /* 15% */ \
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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 = 0, \
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.forkexec_idx = 0, \
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\
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.flags = 1*SD_LOAD_BALANCE \
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| 1*SD_BALANCE_NEWIDLE \
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| 1*SD_BALANCE_EXEC \
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| 1*SD_BALANCE_FORK \
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| 0*SD_BALANCE_WAKE \
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| 1*SD_WAKE_AFFINE \
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| 1*SD_PREFER_LOCAL \
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| 0*SD_SHARE_CPUPOWER \
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| 1*SD_SHARE_PKG_RESOURCES \
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| 0*SD_SERIALIZE \
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| sd_balance_for_mc_power() \
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| sd_power_saving_flags() \
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, \
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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 = 0, \
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.wake_idx = 0, \
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.forkexec_idx = 0, \
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\
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.flags = 1*SD_LOAD_BALANCE \
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| 1*SD_BALANCE_NEWIDLE \
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| 1*SD_BALANCE_EXEC \
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| 1*SD_BALANCE_FORK \
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| 0*SD_BALANCE_WAKE \
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| 1*SD_WAKE_AFFINE \
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| 1*SD_PREFER_LOCAL \
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| 0*SD_SHARE_CPUPOWER \
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| 0*SD_SHARE_PKG_RESOURCES \
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| 0*SD_SERIALIZE \
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| sd_balance_for_package_power() \
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| sd_power_saving_flags() \
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, \
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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 = 1*SD_LOAD_BALANCE \
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| 1*SD_BALANCE_NEWIDLE \
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| 0*SD_BALANCE_EXEC \
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| 0*SD_BALANCE_FORK \
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| 0*SD_BALANCE_WAKE \
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| 0*SD_WAKE_AFFINE \
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| 0*SD_SHARE_CPUPOWER \
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| 0*SD_POWERSAVINGS_BALANCE \
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| 0*SD_SHARE_PKG_RESOURCES \
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| 1*SD_SERIALIZE \
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| 0*SD_PREFER_SIBLING \
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, \
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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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#ifndef topology_thread_cpumask
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#define topology_thread_cpumask(cpu) cpumask_of(cpu)
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#endif
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#ifndef topology_core_cpumask
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#define topology_core_cpumask(cpu) cpumask_of(cpu)
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#endif
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/* Returns the number of the current Node. */
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#ifndef numa_node_id
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#define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
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#endif
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#endif /* _LINUX_TOPOLOGY_H */
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