linux/arch/ia64/include/asm/topology.h
Mel Gorman 4f9b16a647 mm: disable zone_reclaim_mode by default
When it was introduced, zone_reclaim_mode made sense as NUMA distances
punished and workloads were generally partitioned to fit into a NUMA
node.  NUMA machines are now common but few of the workloads are
NUMA-aware and it's routine to see major performance degradation due to
zone_reclaim_mode being enabled but relatively few can identify the
problem.

Those that require zone_reclaim_mode are likely to be able to detect
when it needs to be enabled and tune appropriately so lets have a
sensible default for the bulk of users.

This patch (of 2):

zone_reclaim_mode causes processes to prefer reclaiming memory from
local node instead of spilling over to other nodes.  This made sense
initially when NUMA machines were almost exclusively HPC and the
workload was partitioned into nodes.  The NUMA penalties were
sufficiently high to justify reclaiming the memory.  On current machines
and workloads it is often the case that zone_reclaim_mode destroys
performance but not all users know how to detect this.  Favour the
common case and disable it by default.  Users that are sophisticated
enough to know they need zone_reclaim_mode will detect it.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04 16:53:59 -07:00

68 lines
1.8 KiB
C

/*
* Copyright (C) 2002, Erich Focht, NEC
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef _ASM_IA64_TOPOLOGY_H
#define _ASM_IA64_TOPOLOGY_H
#include <asm/acpi.h>
#include <asm/numa.h>
#include <asm/smp.h>
#ifdef CONFIG_NUMA
/* Nodes w/o CPUs are preferred for memory allocations, see build_zonelists */
#define PENALTY_FOR_NODE_WITH_CPUS 255
/*
* Nodes within this distance are eligible for reclaim by zone_reclaim() when
* zone_reclaim_mode is enabled.
*/
#define RECLAIM_DISTANCE 15
/*
* Returns a bitmask of CPUs on Node 'node'.
*/
#define cpumask_of_node(node) ((node) == -1 ? \
cpu_all_mask : \
&node_to_cpu_mask[node])
/*
* Returns the number of the node containing Node 'nid'.
* Not implemented here. Multi-level hierarchies detected with
* the help of node_distance().
*/
#define parent_node(nid) (nid)
/*
* Determines the node for a given pci bus
*/
#define pcibus_to_node(bus) PCI_CONTROLLER(bus)->node
void build_cpu_to_node_map(void);
#endif /* CONFIG_NUMA */
#ifdef CONFIG_SMP
#define topology_physical_package_id(cpu) (cpu_data(cpu)->socket_id)
#define topology_core_id(cpu) (cpu_data(cpu)->core_id)
#define topology_core_cpumask(cpu) (&cpu_core_map[cpu])
#define topology_thread_cpumask(cpu) (&per_cpu(cpu_sibling_map, cpu))
#endif
extern void arch_fix_phys_package_id(int num, u32 slot);
#define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ? \
cpu_all_mask : \
cpumask_of_node(pcibus_to_node(bus)))
#include <asm-generic/topology.h>
#endif /* _ASM_IA64_TOPOLOGY_H */