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sched/numa: Export info needed for NUMA balancing on complex topologies

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Export some information that is necessary to do placement of
tasks on systems with multi-level NUMA topologies.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: mgorman@suse.de
Cc: chegu_vinod@hp.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1413530994-9732-2-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Rik van Riel 2014-10-17 03:29:49 -04:00 • committed by Ingo Molnar
commit 9942f79baa
2 changed files with 8 additions and 1 deletions
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4
kernel/sched/core.c
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@ -6129,6 +6129,7 @@ static void claim_allocations(int cpu, struct sched_domain *sd)
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA
static int sched_domains_numa_levels; static int sched_domains_numa_levels;
static int *sched_domains_numa_distance; static int *sched_domains_numa_distance;
int sched_max_numa_distance;
static struct cpumask ***sched_domains_numa_masks; static struct cpumask ***sched_domains_numa_masks;
static int sched_domains_curr_level; static int sched_domains_curr_level;
#endif #endif
@ -6300,7 +6301,7 @@ static void sched_numa_warn(const char *str)
printk(KERN_WARNING "\n"); printk(KERN_WARNING "\n");
} }
static bool find_numa_distance(int distance) bool find_numa_distance(int distance)
{ {
int i; int i;
@ -6447,6 +6448,7 @@ static void sched_init_numa(void)
sched_domain_topology = tl; sched_domain_topology = tl;
sched_domains_numa_levels = level; sched_domains_numa_levels = level;
sched_max_numa_distance = sched_domains_numa_distance[level - 1];
} }
static void sched_domains_numa_masks_set(int cpu) static void sched_domains_numa_masks_set(int cpu)

5
kernel/sched/sched.h
View file

@ -678,6 +678,11 @@ static inline u64 rq_clock_task(struct rq *rq)
return rq->clock_task; return rq->clock_task;
} }
#ifdef CONFIG_NUMA
extern int sched_max_numa_distance;
extern bool find_numa_distance(int distance);
#endif
#ifdef CONFIG_NUMA_BALANCING #ifdef CONFIG_NUMA_BALANCING
extern void sched_setnuma(struct task_struct *p, int node); extern void sched_setnuma(struct task_struct *p, int node);
extern int migrate_task_to(struct task_struct *p, int cpu); extern int migrate_task_to(struct task_struct *p, int cpu);