532cb4c401
Check to see if the group is packed in a sched doman. This is primarily intended to used at the sibling level. Some cores like POWER7 prefer to use lower numbered SMT threads. In the case of POWER7, it can move to lower SMT modes only when higher threads are idle. When in lower SMT modes, the threads will perform better since they share less core resources. Hence when we have idle threads, we want them to be the higher ones. This adds a hook into f_b_g() called check_asym_packing() to check the packing. This packing function is run on idle threads. It checks to see if the busiest CPU in this domain (core in the P7 case) has a higher CPU number than what where the packing function is being run on. If it is, calculate the imbalance and return the higher busier thread as the busiest group to f_b_g(). Here we are assuming a lower CPU number will be equivalent to a lower SMT thread number. It also creates a new SD_ASYM_PACKING flag to enable this feature at any scheduler domain level. It also creates an arch hook to enable this feature at the sibling level. The default function doesn't enable this feature. Based heavily on patch from Peter Zijlstra. Fixes from Srivatsa Vaddagiri. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <20100608045702.2936CCC897@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
330 lines
8.3 KiB
C
330 lines
8.3 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 <linux/percpu.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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| 1*SD_SHARE_PKG_RESOURCES \
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| 0*SD_SERIALIZE \
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| 0*SD_PREFER_SIBLING \
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| arch_sd_sibiling_asym_packing() \
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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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| 0*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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| 0*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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#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
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DECLARE_PER_CPU(int, numa_node);
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#ifndef numa_node_id
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/* Returns the number of the current Node. */
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static inline int numa_node_id(void)
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{
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return __this_cpu_read(numa_node);
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}
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#endif
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#ifndef cpu_to_node
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static inline int cpu_to_node(int cpu)
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{
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return per_cpu(numa_node, cpu);
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}
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#endif
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#ifndef set_numa_node
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static inline void set_numa_node(int node)
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{
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percpu_write(numa_node, node);
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}
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#endif
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#ifndef set_cpu_numa_node
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static inline void set_cpu_numa_node(int cpu, int node)
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{
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per_cpu(numa_node, cpu) = node;
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}
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#endif
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#else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
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/* Returns the number of the current Node. */
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#ifndef numa_node_id
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static inline int numa_node_id(void)
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{
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return cpu_to_node(raw_smp_processor_id());
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}
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#endif
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#endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
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#ifdef CONFIG_HAVE_MEMORYLESS_NODES
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/*
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* N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
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* It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
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* Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
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*/
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DECLARE_PER_CPU(int, _numa_mem_);
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#ifndef set_numa_mem
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static inline void set_numa_mem(int node)
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{
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percpu_write(_numa_mem_, node);
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}
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#endif
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#ifndef numa_mem_id
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/* Returns the number of the nearest Node with memory */
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static inline int numa_mem_id(void)
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{
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return __this_cpu_read(_numa_mem_);
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}
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#endif
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#ifndef cpu_to_mem
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static inline int cpu_to_mem(int cpu)
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{
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return per_cpu(_numa_mem_, cpu);
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}
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#endif
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#ifndef set_cpu_numa_mem
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static inline void set_cpu_numa_mem(int cpu, int node)
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{
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per_cpu(_numa_mem_, cpu) = node;
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}
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#endif
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#else /* !CONFIG_HAVE_MEMORYLESS_NODES */
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static inline void set_numa_mem(int node) {}
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static inline void set_cpu_numa_mem(int cpu, int node) {}
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#ifndef numa_mem_id
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/* Returns the number of the nearest Node with memory */
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static inline int numa_mem_id(void)
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{
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return numa_node_id();
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}
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#endif
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#ifndef cpu_to_mem
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static inline int cpu_to_mem(int cpu)
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{
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return cpu_to_node(cpu);
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}
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#endif
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#endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
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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_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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#endif /* _LINUX_TOPOLOGY_H */
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