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sched/numa: Track NUMA hinting faults on per-node basis 

This patch tracks what nodes numa hinting faults were incurred on.
This information is later used to schedule a task on the node storing
the pages most frequently faulted by the task.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-20-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mel Gorman 2013-10-07 11:28:57 +01:00 committed by Ingo Molnar
parent f307cd1a32
commit f809ca9a55
4 changed files with 27 additions and 1 deletions
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2
include/linux/sched.h
View File

@ -1342,6 +1342,8 @@ struct task_struct {
unsigned int numa_scan_period_max;
u64 node_stamp; /* migration stamp */
struct callback_head numa_work;
unsigned long *numa_faults;
#endif /* CONFIG_NUMA_BALANCING */
struct rcu_head rcu;

3
kernel/sched/core.c
View File

@ -1634,6 +1634,7 @@ static void __sched_fork(struct task_struct *p)
p->numa_migrate_seq = p->mm ? p->mm->numa_scan_seq - 1 : 0;
p->numa_scan_period = sysctl_numa_balancing_scan_delay;
p->numa_work.next = &p->numa_work;
p->numa_faults = NULL;
#endif /* CONFIG_NUMA_BALANCING */
}
@ -1892,6 +1893,8 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
if (mm)
mmdrop(mm);
if (unlikely(prev_state == TASK_DEAD)) {
task_numa_free(prev);
/*
* Remove function-return probe instances associated with this
* task and put them back on the free list.

11
kernel/sched/fair.c
View File

@ -902,7 +902,14 @@ void task_numa_fault(int node, int pages, bool migrated)
if (!numabalancing_enabled)
return;
/* FIXME: Allocate task-specific structure for placement policy here */
/* Allocate buffer to track faults on a per-node basis */
if (unlikely(!p->numa_faults)) {
int size = sizeof(*p->numa_faults) * nr_node_ids;
p->numa_faults = kzalloc(size, GFP_KERNEL|__GFP_NOWARN);
if (!p->numa_faults)
return;
}
/*
* If pages are properly placed (did not migrate) then scan slower.
@ -918,6 +925,8 @@ void task_numa_fault(int node, int pages, bool migrated)
}
task_numa_placement(p);
p->numa_faults[node] += pages;
}
static void reset_ptenuma_scan(struct task_struct *p)

12
kernel/sched/sched.h
View File

@ -6,6 +6,7 @@
#include <linux/spinlock.h>
#include <linux/stop_machine.h>
#include <linux/tick.h>
#include <linux/slab.h>
#include "cpupri.h"
#include "cpuacct.h"
@ -555,6 +556,17 @@ static inline u64 rq_clock_task(struct rq *rq)
return rq->clock_task;
}
#ifdef CONFIG_NUMA_BALANCING
static inline void task_numa_free(struct task_struct *p)
{
kfree(p->numa_faults);
}
#else /* CONFIG_NUMA_BALANCING */
static inline void task_numa_free(struct task_struct *p)
{
}
#endif /* CONFIG_NUMA_BALANCING */
#ifdef CONFIG_SMP
#define rcu_dereference_check_sched_domain(p) \