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authorJohannes Weiner <hannes@cmpxchg.org>2016-03-15 14:57:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commit689c94f03ae251181725fe853b4ffc870f05c7fe (patch)
tree8bdb481bfce6e505d3b31ce6e6802ffc886f1df3
parent81f8c3a461d16f0355ced3d56d6d1bb5923207a1 (diff)
downloadlinux-689c94f03ae251181725fe853b4ffc870f05c7fe.tar.bz2
mm: workingset: #define radix entry eviction mask
This is a compile-time constant, no need to calculate it on refault. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/workingset.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/mm/workingset.c b/mm/workingset.c
index 61ead9e5549d..3ef92f6e41fe 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -152,6 +152,10 @@
* refault distance will immediately activate the refaulting page.
*/
+#define EVICTION_SHIFT (RADIX_TREE_EXCEPTIONAL_ENTRY + \
+ ZONES_SHIFT + NODES_SHIFT)
+#define EVICTION_MASK (~0UL >> EVICTION_SHIFT)
+
static void *pack_shadow(unsigned long eviction, struct zone *zone)
{
eviction = (eviction << NODES_SHIFT) | zone_to_nid(zone);
@@ -168,7 +172,6 @@ static void unpack_shadow(void *shadow,
unsigned long entry = (unsigned long)shadow;
unsigned long eviction;
unsigned long refault;
- unsigned long mask;
int zid, nid;
entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT;
@@ -181,8 +184,7 @@ static void unpack_shadow(void *shadow,
*zone = NODE_DATA(nid)->node_zones + zid;
refault = atomic_long_read(&(*zone)->inactive_age);
- mask = ~0UL >> (NODES_SHIFT + ZONES_SHIFT +
- RADIX_TREE_EXCEPTIONAL_SHIFT);
+
/*
* The unsigned subtraction here gives an accurate distance
* across inactive_age overflows in most cases.
@@ -199,7 +201,7 @@ static void unpack_shadow(void *shadow,
* inappropriate activation leading to pressure on the active
* list is not a problem.
*/
- *distance = (refault - eviction) & mask;
+ *distance = (refault - eviction) & EVICTION_MASK;
}
/**