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Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c47
1 files changed, 22 insertions, 25 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 7b3ae977b15..143b019e983 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -110,7 +110,7 @@ enum zone_type policy_zone = 0;
struct mempolicy default_policy = {
.refcnt = ATOMIC_INIT(1), /* never free it */
.mode = MPOL_PREFERRED,
- .v = { .preferred_node = -1 },
+ .flags = MPOL_F_LOCAL,
};
static const struct mempolicy_operations {
@@ -163,7 +163,7 @@ static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes)
static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes)
{
if (!nodes)
- pol->v.preferred_node = -1; /* local allocation */
+ pol->flags |= MPOL_F_LOCAL; /* local allocation */
else if (nodes_empty(*nodes))
return -EINVAL; /* no allowed nodes */
else
@@ -290,14 +290,15 @@ static void mpol_rebind_preferred(struct mempolicy *pol,
if (pol->flags & MPOL_F_STATIC_NODES) {
int node = first_node(pol->w.user_nodemask);
- if (node_isset(node, *nodes))
+ if (node_isset(node, *nodes)) {
pol->v.preferred_node = node;
- else
- pol->v.preferred_node = -1;
+ pol->flags &= ~MPOL_F_LOCAL;
+ } else
+ pol->flags |= MPOL_F_LOCAL;
} else if (pol->flags & MPOL_F_RELATIVE_NODES) {
mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes);
pol->v.preferred_node = first_node(tmp);
- } else if (pol->v.preferred_node != -1) {
+ } else if (!(pol->flags & MPOL_F_LOCAL)) {
pol->v.preferred_node = node_remap(pol->v.preferred_node,
pol->w.cpuset_mems_allowed,
*nodes);
@@ -645,7 +646,7 @@ static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes)
*nodes = p->v.nodes;
break;
case MPOL_PREFERRED:
- if (p->v.preferred_node >= 0)
+ if (!(p->flags & MPOL_F_LOCAL))
node_set(p->v.preferred_node, *nodes);
/* else return empty node mask for local allocation */
break;
@@ -1324,13 +1325,12 @@ static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy)
/* Return a zonelist indicated by gfp for node representing a mempolicy */
static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy)
{
- int nd;
+ int nd = numa_node_id();
switch (policy->mode) {
case MPOL_PREFERRED:
- nd = policy->v.preferred_node;
- if (nd < 0)
- nd = numa_node_id();
+ if (!(policy->flags & MPOL_F_LOCAL))
+ nd = policy->v.preferred_node;
break;
case MPOL_BIND:
/*
@@ -1339,16 +1339,13 @@ static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy)
* current node is part of the mask, we use the zonelist for
* the first node in the mask instead.
*/
- nd = numa_node_id();
if (unlikely(gfp & __GFP_THISNODE) &&
unlikely(!node_isset(nd, policy->v.nodes)))
nd = first_node(policy->v.nodes);
break;
case MPOL_INTERLEAVE: /* should not happen */
- nd = numa_node_id();
break;
default:
- nd = 0;
BUG();
}
return node_zonelist(nd, gfp);
@@ -1379,14 +1376,15 @@ static unsigned interleave_nodes(struct mempolicy *policy)
*/
unsigned slab_node(struct mempolicy *policy)
{
- if (!policy)
+ if (!policy || policy->flags & MPOL_F_LOCAL)
return numa_node_id();
switch (policy->mode) {
case MPOL_PREFERRED:
- if (unlikely(policy->v.preferred_node >= 0))
- return policy->v.preferred_node;
- return numa_node_id();
+ /*
+ * handled MPOL_F_LOCAL above
+ */
+ return policy->v.preferred_node;
case MPOL_INTERLEAVE:
return interleave_nodes(policy);
@@ -1666,7 +1664,8 @@ int __mpol_equal(struct mempolicy *a, struct mempolicy *b)
case MPOL_INTERLEAVE:
return nodes_equal(a->v.nodes, b->v.nodes);
case MPOL_PREFERRED:
- return a->v.preferred_node == b->v.preferred_node;
+ return a->v.preferred_node == b->v.preferred_node &&
+ a->flags == b->flags;
default:
BUG();
return 0;
@@ -1946,7 +1945,7 @@ void numa_default_policy(void)
}
/*
- * "local" is pseudo-policy: MPOL_PREFERRED with preferred_node == -1
+ * "local" is pseudo-policy: MPOL_PREFERRED with MPOL_F_LOCAL flag
* Used only for mpol_to_str()
*/
#define MPOL_LOCAL (MPOL_INTERLEAVE + 1)
@@ -1962,7 +1961,6 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
{
char *p = buffer;
int l;
- int nid;
nodemask_t nodes;
unsigned short mode;
unsigned short flags = pol ? pol->flags : 0;
@@ -1979,11 +1977,10 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
case MPOL_PREFERRED:
nodes_clear(nodes);
- nid = pol->v.preferred_node;
- if (nid < 0)
+ if (flags & MPOL_F_LOCAL)
mode = MPOL_LOCAL; /* pseudo-policy */
else
- node_set(nid, nodes);
+ node_set(pol->v.preferred_node, nodes);
break;
case MPOL_BIND:
@@ -2004,7 +2001,7 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
strcpy(p, policy_types[mode]);
p += l;
- if (flags) {
+ if (flags & MPOL_MODE_FLAGS) {
int need_bar = 0;
if (buffer + maxlen < p + 2)