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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/topology.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/linux/topology.h')
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diff --git a/include/linux/topology.h b/include/linux/topology.h
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+/*
+ * include/linux/topology.h
+ *
+ * Written by: Matthew Dobson, IBM Corporation
+ *
+ * Copyright (C) 2002, IBM Corp.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <colpatch@us.ibm.com>
+ */
+#ifndef _LINUX_TOPOLOGY_H
+#define _LINUX_TOPOLOGY_H
+
+#include <linux/cpumask.h>
+#include <linux/bitops.h>
+#include <linux/mmzone.h>
+#include <linux/smp.h>
+#include <asm/topology.h>
+
+#ifndef node_has_online_mem
+#define node_has_online_mem(nid) (1)
+#endif
+
+#ifndef nr_cpus_node
+#define nr_cpus_node(node) \
+ ({ \
+ cpumask_t __tmp__; \
+ __tmp__ = node_to_cpumask(node); \
+ cpus_weight(__tmp__); \
+ })
+#endif
+
+#define for_each_node_with_cpus(node) \
+ for_each_online_node(node) \
+ if (nr_cpus_node(node))
+
+#ifndef node_distance
+/* Conform to ACPI 2.0 SLIT distance definitions */
+#define LOCAL_DISTANCE 10
+#define REMOTE_DISTANCE 20
+#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
+#endif
+#ifndef PENALTY_FOR_NODE_WITH_CPUS
+#define PENALTY_FOR_NODE_WITH_CPUS (1)
+#endif
+
+/*
+ * Below are the 3 major initializers used in building sched_domains:
+ * SD_SIBLING_INIT, for SMT domains
+ * SD_CPU_INIT, for SMP domains
+ * SD_NODE_INIT, for NUMA domains
+ *
+ * Any architecture that cares to do any tuning to these values should do so
+ * by defining their own arch-specific initializer in include/asm/topology.h.
+ * A definition there will automagically override these default initializers
+ * and allow arch-specific performance tuning of sched_domains.
+ */
+#ifdef CONFIG_SCHED_SMT
+/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
+ * so can't we drop this in favor of CONFIG_SCHED_SMT?
+ */
+#define ARCH_HAS_SCHED_WAKE_IDLE
+/* Common values for SMT siblings */
+#ifndef SD_SIBLING_INIT
+#define SD_SIBLING_INIT (struct sched_domain) { \
+ .span = CPU_MASK_NONE, \
+ .parent = NULL, \
+ .groups = NULL, \
+ .min_interval = 1, \
+ .max_interval = 2, \
+ .busy_factor = 8, \
+ .imbalance_pct = 110, \
+ .cache_hot_time = 0, \
+ .cache_nice_tries = 0, \
+ .per_cpu_gain = 25, \
+ .flags = SD_LOAD_BALANCE \
+ | SD_BALANCE_NEWIDLE \
+ | SD_BALANCE_EXEC \
+ | SD_WAKE_AFFINE \
+ | SD_WAKE_IDLE \
+ | SD_SHARE_CPUPOWER, \
+ .last_balance = jiffies, \
+ .balance_interval = 1, \
+ .nr_balance_failed = 0, \
+}
+#endif
+#endif /* CONFIG_SCHED_SMT */
+
+/* Common values for CPUs */
+#ifndef SD_CPU_INIT
+#define SD_CPU_INIT (struct sched_domain) { \
+ .span = CPU_MASK_NONE, \
+ .parent = NULL, \
+ .groups = NULL, \
+ .min_interval = 1, \
+ .max_interval = 4, \
+ .busy_factor = 64, \
+ .imbalance_pct = 125, \
+ .cache_hot_time = (5*1000000/2), \
+ .cache_nice_tries = 1, \
+ .per_cpu_gain = 100, \
+ .flags = SD_LOAD_BALANCE \
+ | SD_BALANCE_NEWIDLE \
+ | SD_BALANCE_EXEC \
+ | SD_WAKE_AFFINE \
+ | SD_WAKE_IDLE \
+ | SD_WAKE_BALANCE, \
+ .last_balance = jiffies, \
+ .balance_interval = 1, \
+ .nr_balance_failed = 0, \
+}
+#endif
+
+#ifdef CONFIG_NUMA
+#ifndef SD_NODE_INIT
+#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
+#endif
+#endif /* CONFIG_NUMA */
+
+#endif /* _LINUX_TOPOLOGY_H */