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mm, mempolicy: rename slab_node for clarity

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slab_node() is actually a mempolicy function, so rename it to
mempolicy_slab_node() to make it clearer that it used for processes with
mempolicies.

At the same time, cleanup its code by saving numa_mem_id() in a local
variable (since we require a node with memory, not just any node) and
remove an obsolete comment that assumes the mempolicy is actually passed
into the function.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Tim Hockin <thockin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2014-04-07 15:37:29 -07:00 committed by Linus Torvalds
parent 514ddb446c
commit 2a389610a7
4 changed files with 10 additions and 13 deletions
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2
include/linux/mempolicy.h
View File

@ -151,7 +151,7 @@ extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
const nodemask_t *mask);
extern unsigned slab_node(void);
extern unsigned int mempolicy_slab_node(void);
extern enum zone_type policy_zone;

15
mm/mempolicy.c
View File

@ -1782,21 +1782,18 @@ static unsigned interleave_nodes(struct mempolicy *policy)
/*
* Depending on the memory policy provide a node from which to allocate the
* next slab entry.
* @policy must be protected by freeing by the caller. If @policy is
* the current task's mempolicy, this protection is implicit, as only the
* task can change it's policy. The system default policy requires no
* such protection.
*/
unsigned slab_node(void)
unsigned int mempolicy_slab_node(void)
{
struct mempolicy *policy;
int node = numa_mem_id();
if (in_interrupt())
return numa_node_id();
return node;
policy = current->mempolicy;
if (!policy || policy->flags & MPOL_F_LOCAL)
return numa_node_id();
return node;
switch (policy->mode) {
case MPOL_PREFERRED:
@ -1816,11 +1813,11 @@ unsigned slab_node(void)
struct zonelist *zonelist;
struct zone *zone;
enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL);
zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0];
zonelist = &NODE_DATA(node)->node_zonelists[0];
(void)first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes,
&zone);
return zone ? zone->node : numa_node_id();
return zone ? zone->node : node;
}
default:

4
mm/slab.c
View File

@ -3042,7 +3042,7 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD))
nid_alloc = cpuset_slab_spread_node();
else if (current->mempolicy)
nid_alloc = slab_node();
nid_alloc = mempolicy_slab_node();
if (nid_alloc != nid_here)
return ____cache_alloc_node(cachep, flags, nid_alloc);
return NULL;
@ -3074,7 +3074,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
retry_cpuset:
cpuset_mems_cookie = read_mems_allowed_begin();
zonelist = node_zonelist(slab_node(), flags);
zonelist = node_zonelist(mempolicy_slab_node(), flags);
retry:
/*

2
mm/slub.c
View File

@ -1685,7 +1685,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
do {
cpuset_mems_cookie = read_mems_allowed_begin();
zonelist = node_zonelist(slab_node(), flags);
zonelist = node_zonelist(mempolicy_slab_node(), flags);
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
struct kmem_cache_node *n;