The patch titled
Subject: mempolicy: fix is_valid_nodemask()
has been removed from the -mm tree. Its filename was
mempolicy-fix-is_valid_nodemask.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Subject: mempolicy: fix is_valid_nodemask()
is_valid_nodemask() was introduced by 19770b32 ("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 b377fd ("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@xxxxxxxxxxxxxx>
Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Cc: Jiang Liu <jiang.liu@xxxxxxxxxx>
Cc: Jianguo Wu <wujianguo@xxxxxxxxxx>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 36 ++++++++++++++++++++++--------------
1 file changed, 22 insertions(+), 14 deletions(-)
diff -puN mm/mempolicy.c~mempolicy-fix-is_valid_nodemask mm/mempolicy.c
--- a/mm/mempolicy.c~mempolicy-fix-is_valid_nodemask
+++ a/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
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
{
/* 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;
_
Patches currently in -mm which might be from laijs@xxxxxxxxxxxxxx are
origin.patch
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