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https://github.com/edk2-porting/linux-next.git
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69f7c0a1be
Remove the SMT-nice feature which idles sibling cpus on SMT cpus to facilitiate nice working properly where cpu power is shared. The idling of cpus in the presence of runnable tasks is considered too fragile, easy to break with outside code, and the complexity of managing this system if an architecture comes along with many logical cores sharing cpu power will be unworkable. Remove the associated per_cpu_gain variable in sched_domains used only by this code. Also: The reason is that with dynticks enabled, this code breaks without yet further tweaks so dynticks brought on the rapid demise of this code. So either we tweak this code or kill it off entirely. It was Ingo's preference to kill it off. Either way this needs to happen for 2.6.21 since dynticks has gone in. Signed-off-by: Con Kolivas <kernel@kolivas.org> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/*
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* linux/include/asm-ia64/topology.h
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*
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* Copyright (C) 2002, Erich Focht, NEC
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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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#ifndef _ASM_IA64_TOPOLOGY_H
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#define _ASM_IA64_TOPOLOGY_H
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#include <asm/acpi.h>
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#include <asm/numa.h>
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#include <asm/smp.h>
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#ifdef CONFIG_NUMA
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/* Nodes w/o CPUs are preferred for memory allocations, see build_zonelists */
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#define PENALTY_FOR_NODE_WITH_CPUS 255
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/*
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* Distance above which we begin to use zone reclaim
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*/
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#define RECLAIM_DISTANCE 15
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/*
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* Returns the number of the node containing CPU 'cpu'
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*/
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#define cpu_to_node(cpu) (int)(cpu_to_node_map[cpu])
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/*
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* Returns a bitmask of CPUs on Node 'node'.
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*/
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#define node_to_cpumask(node) (node_to_cpu_mask[node])
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/*
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* Returns the number of the node containing Node 'nid'.
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* Not implemented here. Multi-level hierarchies detected with
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* the help of node_distance().
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*/
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#define parent_node(nid) (nid)
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/*
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* Returns the number of the first CPU on Node 'node'.
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*/
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#define node_to_first_cpu(node) (first_cpu(node_to_cpumask(node)))
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/*
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* Determines the node for a given pci bus
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*/
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#define pcibus_to_node(bus) PCI_CONTROLLER(bus)->node
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void build_cpu_to_node_map(void);
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#define SD_CPU_INIT (struct sched_domain) { \
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.span = CPU_MASK_NONE, \
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.parent = NULL, \
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.child = NULL, \
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.groups = NULL, \
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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 = 2, \
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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_NEWIDLE \
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| SD_BALANCE_EXEC \
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| SD_WAKE_AFFINE, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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.nr_balance_failed = 0, \
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}
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/* sched_domains SD_NODE_INIT for IA64 NUMA machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.span = CPU_MASK_NONE, \
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.parent = NULL, \
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.child = NULL, \
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.groups = NULL, \
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.min_interval = 8, \
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.max_interval = 8*(min(num_online_cpus(), 32)), \
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.busy_factor = 64, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 2, \
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.busy_idx = 3, \
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.idle_idx = 2, \
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.newidle_idx = 0, /* unused */ \
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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_SERIALIZE \
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| SD_WAKE_BALANCE, \
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.last_balance = jiffies, \
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.balance_interval = 64, \
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.nr_balance_failed = 0, \
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}
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#endif /* CONFIG_NUMA */
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#ifdef CONFIG_SMP
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#define topology_physical_package_id(cpu) (cpu_data(cpu)->socket_id)
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#define topology_core_id(cpu) (cpu_data(cpu)->core_id)
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#define topology_core_siblings(cpu) (cpu_core_map[cpu])
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#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
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#define smt_capable() (smp_num_siblings > 1)
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#endif
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#include <asm-generic/topology.h>
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#endif /* _ASM_IA64_TOPOLOGY_H */
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