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sched/numa: Turn some magic numbers into #defines 

Cleanup suggested by Mel Gorman. Now the code contains some more
hints on what statistics go where.

Suggested-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-10-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Rik van Riel 2014-01-27 17:03:48 -05:00 committed by Ingo Molnar
parent 58b46da336
commit be1e4e760d
1 changed files with 25 additions and 9 deletions
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34
kernel/sched/fair.c
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@ -896,6 +896,15 @@ struct numa_group {
unsigned long faults[0];
};
/* Shared or private faults. */
#define NR_NUMA_HINT_FAULT_TYPES 2
/* Memory and CPU locality */
#define NR_NUMA_HINT_FAULT_STATS (NR_NUMA_HINT_FAULT_TYPES * 2)
/* Averaged statistics, and temporary buffers. */
#define NR_NUMA_HINT_FAULT_BUCKETS (NR_NUMA_HINT_FAULT_STATS * 2)
pid_t task_numa_group_id(struct task_struct *p)
{
return p->numa_group ? p->numa_group->gid : 0;
@ -903,7 +912,7 @@ pid_t task_numa_group_id(struct task_struct *p)
static inline int task_faults_idx(int nid, int priv)
{
return 2 * nid + priv;
return NR_NUMA_HINT_FAULT_TYPES * nid + priv;
}
static inline unsigned long task_faults(struct task_struct *p, int nid)
@ -1509,7 +1518,7 @@ static void task_numa_placement(struct task_struct *p)
unsigned long faults = 0, group_faults = 0;
int priv, i;
for (priv = 0; priv < 2; priv++) {
for (priv = 0; priv < NR_NUMA_HINT_FAULT_TYPES; priv++) {
long diff, f_diff, f_weight;
i = task_faults_idx(nid, priv);
@ -1620,11 +1629,12 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags,
INIT_LIST_HEAD(&grp->task_list);
grp->gid = p->pid;
/* Second half of the array tracks nids where faults happen */
grp->faults_cpu = grp->faults + 2 * nr_node_ids;
grp->faults_cpu = grp->faults + NR_NUMA_HINT_FAULT_TYPES *
nr_node_ids;
node_set(task_node(current), grp->active_nodes);
for (i = 0; i < 4*nr_node_ids; i++)
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++)
grp->faults[i] = p->numa_faults_memory[i];
grp->total_faults = p->total_numa_faults;
@ -1682,7 +1692,7 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags,
double_lock(&my_grp->lock, &grp->lock);
for (i = 0; i < 4*nr_node_ids; i++) {
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++) {
my_grp->faults[i] -= p->numa_faults_memory[i];
grp->faults[i] += p->numa_faults_memory[i];
}
@ -1714,7 +1724,7 @@ void task_numa_free(struct task_struct *p)
if (grp) {
spin_lock(&grp->lock);
for (i = 0; i < 4*nr_node_ids; i++)
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++)
grp->faults[i] -= p->numa_faults_memory[i];
grp->total_faults -= p->total_numa_faults;
@ -1755,14 +1765,20 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
/* Allocate buffer to track faults on a per-node basis */
if (unlikely(!p->numa_faults_memory)) {
int size = sizeof(*p->numa_faults_memory) * 4 * nr_node_ids;
int size = sizeof(*p->numa_faults_memory) *
NR_NUMA_HINT_FAULT_BUCKETS * nr_node_ids;
/* numa_faults and numa_faults_buffer share the allocation */
p->numa_faults_memory = kzalloc(size * 2, GFP_KERNEL|__GFP_NOWARN);
p->numa_faults_memory = kzalloc(size, GFP_KERNEL|__GFP_NOWARN);
if (!p->numa_faults_memory)
return;
BUG_ON(p->numa_faults_buffer_memory);
/*
* The averaged statistics, shared & private, memory & cpu,
* occupy the first half of the array. The second half of the
* array is for current counters, which are averaged into the
* first set by task_numa_placement.
*/
p->numa_faults_cpu = p->numa_faults_memory + (2 * nr_node_ids);
p->numa_faults_buffer_memory = p->numa_faults_memory + (4 * nr_node_ids);
p->numa_faults_buffer_cpu = p->numa_faults_memory + (6 * nr_node_ids);