The patch titled
Subject: mm: workingset: #define radix entry eviction mask
has been added to the -mm tree. Its filename is
mm-workingset-define-radix-entry-eviction-mask.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-workingset-define-radix-entry-eviction-mask.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-workingset-define-radix-entry-eviction-mask.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx>
Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/workingset.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff -puN mm/workingset.c~mm-workingset-define-radix-entry-eviction-mask mm/workingset.c
--- a/mm/workingset.c~mm-workingset-define-radix-entry-eviction-mask
+++ a/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;
}
/**
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
proc-revert-proc-pid-maps-annotation.patch
mm-memcontrol-drop-superfluous-entry-in-the-per-memcg-stats-array.patch
documentation-cgroup-v2-add-memorystat-sock-description.patch
mm-memcontrol-generalize-locking-for-the-page-mem_cgroup-binding.patch
mm-workingset-define-radix-entry-eviction-mask.patch
mm-workingset-separate-shadow-unpacking-and-refault-calculation.patch
mm-workingset-eviction-buckets-for-bigmem-lowbit-machines.patch
mm-workingset-per-cgroup-cache-thrash-detection.patch
mm-oom_killc-dont-skip-pf_exiting-tasks-when-searching-for-a-victim.patch
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