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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>
This commit is contained in:
Johannes Weiner 2016-03-15 14:57:07 -07:00 committed by Linus Torvalds
parent 81f8c3a461
commit 689c94f03a
1 changed files with 6 additions and 4 deletions
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10
mm/workingset.c
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@ -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;
}
/**