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| author | Johannes Weiner <hannes@cmpxchg.org> | 2016-03-15 14:57:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 16:55:16 -0700 |
| commit | 689c94f03ae251181725fe853b4ffc870f05c7fe (patch) | |
| tree | 8bdb481bfce6e505d3b31ce6e6802ffc886f1df3 /mm/workingset.c | |
| parent | 81f8c3a461d16f0355ced3d56d6d1bb5923207a1 (diff) | |
| download | lwn-689c94f03ae251181725fe853b4ffc870f05c7fe.tar.gz lwn-689c94f03ae251181725fe853b4ffc870f05c7fe.zip | |
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>
Diffstat (limited to 'mm/workingset.c')
| -rw-r--r-- | mm/workingset.c | 10 |
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; } /** |