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9fcd18c9e6
Impact: improve wakeup affinity on NUMA systems, tweak SMP systems
Given the fixes+tweaks to the wakeup-buddy code, re-tweak the domain
balancing defaults on NUMA and SMP systems.
Turn on SD_WAKE_AFFINE which was off on x86 NUMA - there's no reason
why we would not want to have wakeup affinity across nodes as well.
(we already do this in the standard NUMA template.)
lat_ctx on a NUMA box is particularly happy about this change:
before:
| phoenix:~/l> ./lat_ctx -s 0 2
| "size=0k ovr=2.60
| 2 5.70
after:
| phoenix:~/l> ./lat_ctx -s 0 2
| "size=0k ovr=2.65
| 2 2.07
a 2.75x speedup.
pipe-test is similarly happy about it too:
| phoenix:~/sched-tests> ./pipe-test
| 18.26 usecs/loop.
| 14.70 usecs/loop.
| 14.38 usecs/loop.
| 10.55 usecs/loop. # +WAKE_AFFINE on domain0+domain1
| 8.63 usecs/loop.
| 8.59 usecs/loop.
| 9.03 usecs/loop.
| 8.94 usecs/loop.
| 8.96 usecs/loop.
| 8.63 usecs/loop.
Also:
- disable SD_BALANCE_NEWIDLE on NUMA and SMP domains (keep it for siblings)
- enable SD_WAKE_BALANCE on SMP domains
Sysbench+postgresql improves all around the board, quite significantly:
.28-rc3-11474e2c .28-rc3-11474e2c-tune
-------------------------------------------------
1: 571 688 +17.08%
2: 1236 1206 -2.55%
4: 2381 2642 +9.89%
8: 4958 5164 +3.99%
16: 9580 9574 -0.07%
32: 7128 8118 +12.20%
64: 7342 8266 +11.18%
128: 7342 8064 +8.95%
256: 7519 7884 +4.62%
512: 7350 7731 +4.93%
-------------------------------------------------
SUM: 55412 59341 +6.62%
So it's a win both for the runup portion, the peak area and the tail.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/*
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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 _ASM_X86_TOPOLOGY_H
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#define _ASM_X86_TOPOLOGY_H
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#ifdef CONFIG_X86_32
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# ifdef CONFIG_X86_HT
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# define ENABLE_TOPO_DEFINES
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# endif
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#else
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# ifdef CONFIG_SMP
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# define ENABLE_TOPO_DEFINES
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# endif
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#endif
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/* Node not present */
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#define NUMA_NO_NODE (-1)
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#ifdef CONFIG_NUMA
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#include <linux/cpumask.h>
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#include <asm/mpspec.h>
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#ifdef CONFIG_X86_32
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/* Mappings between node number and cpus on that node. */
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extern cpumask_t node_to_cpumask_map[];
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/* Mappings between logical cpu number and node number */
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extern int cpu_to_node_map[];
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/* Returns the number of the node containing CPU 'cpu' */
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static inline int cpu_to_node(int cpu)
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{
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return cpu_to_node_map[cpu];
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}
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#define early_cpu_to_node(cpu) cpu_to_node(cpu)
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/* Returns a bitmask of CPUs on Node 'node'.
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*
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* Side note: this function creates the returned cpumask on the stack
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* so with a high NR_CPUS count, excessive stack space is used. The
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* node_to_cpumask_ptr function should be used whenever possible.
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*/
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static inline cpumask_t node_to_cpumask(int node)
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{
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return node_to_cpumask_map[node];
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}
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#else /* CONFIG_X86_64 */
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/* Mappings between node number and cpus on that node. */
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extern cpumask_t *node_to_cpumask_map;
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/* Mappings between logical cpu number and node number */
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DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
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/* Returns the number of the current Node. */
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#define numa_node_id() read_pda(nodenumber)
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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extern int cpu_to_node(int cpu);
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extern int early_cpu_to_node(int cpu);
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extern const cpumask_t *_node_to_cpumask_ptr(int node);
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extern cpumask_t node_to_cpumask(int node);
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#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
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/* Returns the number of the node containing CPU 'cpu' */
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static inline int cpu_to_node(int cpu)
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{
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return per_cpu(x86_cpu_to_node_map, cpu);
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}
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/* Same function but used if called before per_cpu areas are setup */
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static inline int early_cpu_to_node(int cpu)
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{
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if (early_per_cpu_ptr(x86_cpu_to_node_map))
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return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
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return per_cpu(x86_cpu_to_node_map, cpu);
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}
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/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
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static inline const cpumask_t *_node_to_cpumask_ptr(int node)
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{
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return &node_to_cpumask_map[node];
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}
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/* Returns a bitmask of CPUs on Node 'node'. */
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static inline cpumask_t node_to_cpumask(int node)
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{
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return node_to_cpumask_map[node];
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}
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#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
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/* Replace default node_to_cpumask_ptr with optimized version */
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#define node_to_cpumask_ptr(v, node) \
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const cpumask_t *v = _node_to_cpumask_ptr(node)
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#define node_to_cpumask_ptr_next(v, node) \
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v = _node_to_cpumask_ptr(node)
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#endif /* CONFIG_X86_64 */
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/*
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* Returns the number of the node containing Node 'node'. This
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* architecture is flat, so it is a pretty simple function!
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*/
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#define parent_node(node) (node)
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#define pcibus_to_node(bus) __pcibus_to_node(bus)
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#define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
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#ifdef CONFIG_X86_32
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extern unsigned long node_start_pfn[];
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extern unsigned long node_end_pfn[];
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extern unsigned long node_remap_size[];
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#define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
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# define SD_CACHE_NICE_TRIES 1
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# define SD_IDLE_IDX 1
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# define SD_NEWIDLE_IDX 2
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# define SD_FORKEXEC_IDX 0
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#else
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# define SD_CACHE_NICE_TRIES 2
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# define SD_IDLE_IDX 2
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# define SD_NEWIDLE_IDX 2
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# define SD_FORKEXEC_IDX 1
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#endif
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/* sched_domains SD_NODE_INIT for NUMA machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.min_interval = 8, \
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.max_interval = 32, \
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.busy_factor = 32, \
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.imbalance_pct = 125, \
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.cache_nice_tries = SD_CACHE_NICE_TRIES, \
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.busy_idx = 3, \
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.idle_idx = SD_IDLE_IDX, \
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.newidle_idx = SD_NEWIDLE_IDX, \
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.wake_idx = 1, \
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.forkexec_idx = SD_FORKEXEC_IDX, \
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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_SERIALIZE, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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}
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#ifdef CONFIG_X86_64_ACPI_NUMA
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extern int __node_distance(int, int);
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#define node_distance(a, b) __node_distance(a, b)
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#endif
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#else /* !CONFIG_NUMA */
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#define numa_node_id() 0
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#define cpu_to_node(cpu) 0
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#define early_cpu_to_node(cpu) 0
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static inline const cpumask_t *_node_to_cpumask_ptr(int node)
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{
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return &cpu_online_map;
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}
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static inline cpumask_t node_to_cpumask(int node)
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{
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return cpu_online_map;
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}
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static inline int node_to_first_cpu(int node)
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{
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return first_cpu(cpu_online_map);
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}
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/* Replace default node_to_cpumask_ptr with optimized version */
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#define node_to_cpumask_ptr(v, node) \
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const cpumask_t *v = _node_to_cpumask_ptr(node)
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#define node_to_cpumask_ptr_next(v, node) \
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v = _node_to_cpumask_ptr(node)
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#endif
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#include <asm-generic/topology.h>
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#ifdef CONFIG_NUMA
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/* Returns the number of the first CPU on Node 'node'. */
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static inline int node_to_first_cpu(int node)
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{
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node_to_cpumask_ptr(mask, node);
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return first_cpu(*mask);
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}
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#endif
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extern cpumask_t cpu_coregroup_map(int cpu);
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#ifdef ENABLE_TOPO_DEFINES
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#define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
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#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
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#define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
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#define topology_thread_siblings(cpu) (per_cpu(cpu_sibling_map, cpu))
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/* indicates that pointers to the topology cpumask_t maps are valid */
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#define arch_provides_topology_pointers yes
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#endif
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static inline void arch_fix_phys_package_id(int num, u32 slot)
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{
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}
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struct pci_bus;
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void set_pci_bus_resources_arch_default(struct pci_bus *b);
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#ifdef CONFIG_SMP
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#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
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#define smt_capable() (smp_num_siblings > 1)
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#endif
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#ifdef CONFIG_NUMA
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extern int get_mp_bus_to_node(int busnum);
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extern void set_mp_bus_to_node(int busnum, int node);
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#else
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static inline int get_mp_bus_to_node(int busnum)
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{
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return 0;
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}
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static inline void set_mp_bus_to_node(int busnum, int node)
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{
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}
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#endif
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#endif /* _ASM_X86_TOPOLOGY_H */
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