linux/include/asm-mips/mach-ip27/topology.h
Con Kolivas 69f7c0a1be [PATCH] sched: remove SMT nice
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>
2007-03-05 07:57:51 -08:00

40 lines
1.1 KiB
C

#ifndef _ASM_MACH_TOPOLOGY_H
#define _ASM_MACH_TOPOLOGY_H 1
#include <asm/sn/hub.h>
#include <asm/mmzone.h>
#define cpu_to_node(cpu) (cpu_data[(cpu)].p_nodeid)
#define parent_node(node) (node)
#define node_to_cpumask(node) (hub_data(node)->h_cpus)
#define node_to_first_cpu(node) (first_cpu(node_to_cpumask(node)))
struct pci_bus;
extern int pcibus_to_node(struct pci_bus *);
#define pcibus_to_cpumask(bus) (cpu_online_map)
extern unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
#define node_distance(from, to) (__node_distances[(from)][(to)])
/* sched_domains SD_NODE_INIT for SGI IP27 machines */
#define SD_NODE_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
.child = NULL, \
.groups = NULL, \
.min_interval = 8, \
.max_interval = 32, \
.busy_factor = 32, \
.imbalance_pct = 125, \
.cache_nice_tries = 1, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_EXEC \
| SD_WAKE_BALANCE, \
.last_balance = jiffies, \
.balance_interval = 1, \
.nr_balance_failed = 0, \
}
#endif /* _ASM_MACH_TOPOLOGY_H */