diff options
author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2013-02-22 16:33:22 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:13 -0800 |
commit | d3eb1570a9221b1b3ea8f6f460a9674c1bb761f1 (patch) | |
tree | 35792d7c35ba7012ea8d43bf5243e04a6b90323f /mm/mempolicy.c | |
parent | 8a356ce38e134b3b09b439e88dc770f8f5567648 (diff) |
mempolicy: fix is_valid_nodemask()
is_valid_nodemask() was introduced by commit 19770b32609b ("mm: filter
based on a nodemask as well as a gfp_mask"). but it does not match its
comments, because it does not check the zone which > policy_zone.
Also in commit b377fd3982ad ("Apply memory policies to top two highest
zones when highest zone is ZONE_MOVABLE"), this commits told us, if
highest zone is ZONE_MOVABLE, we should also apply memory policies to
it. so ZONE_MOVABLE should be valid zone for policies.
is_valid_nodemask() need to be changed to match it.
Fix: check all zones, even its zoneid > policy_zone. Use
nodes_intersects() instead open code to check it.
Reported-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r-- | mm/mempolicy.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index e2df1c1fb41..6f7979c566d 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -161,19 +161,7 @@ static const struct mempolicy_operations { /* Check that the nodemask contains at least one populated zone */ static int is_valid_nodemask(const nodemask_t *nodemask) { - int nd, k; - - for_each_node_mask(nd, *nodemask) { - struct zone *z; - - for (k = 0; k <= policy_zone; k++) { - z = &NODE_DATA(nd)->node_zones[k]; - if (z->present_pages > 0) - return 1; - } - } - - return 0; + return nodes_intersects(*nodemask, node_states[N_MEMORY]); } static inline int mpol_store_user_nodemask(const struct mempolicy *pol) @@ -1644,6 +1632,26 @@ struct mempolicy *get_vma_policy(struct task_struct *task, return pol; } +static int apply_policy_zone(struct mempolicy *policy, enum zone_type zone) +{ + enum zone_type dynamic_policy_zone = policy_zone; + + BUG_ON(dynamic_policy_zone == ZONE_MOVABLE); + + /* + * if policy->v.nodes has movable memory only, + * we apply policy when gfp_zone(gfp) = ZONE_MOVABLE only. + * + * policy->v.nodes is intersect with node_states[N_MEMORY]. + * so if the following test faile, it implies + * policy->v.nodes has movable memory only. + */ + if (!nodes_intersects(policy->v.nodes, node_states[N_HIGH_MEMORY])) + dynamic_policy_zone = ZONE_MOVABLE; + + return zone >= dynamic_policy_zone; +} + /* * Return a nodemask representing a mempolicy for filtering nodes for * page allocation @@ -1652,7 +1660,7 @@ static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) { /* Lower zones don't get a nodemask applied for MPOL_BIND */ if (unlikely(policy->mode == MPOL_BIND) && - gfp_zone(gfp) >= policy_zone && + apply_policy_zone(policy, gfp_zone(gfp)) && cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) return &policy->v.nodes; |