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Date: Mon, 8 Jun 2015 14:56:17 +0100
From: Mel Gorman <mgorman@...e.de>
To: Linux-MM <linux-mm@...ck.org>
Cc: Rik van Riel <riel@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>,
LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 11/25] mm, workingset: Make working set detection node-aware
Working set and refault detection is still zone-based, fix it.
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
include/linux/mmzone.h | 6 +++---
mm/vmstat.c | 6 +++---
mm/workingset.c | 47 +++++++++++++++++++++--------------------------
3 files changed, 27 insertions(+), 32 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1830c2180555..4c761809d151 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -143,9 +143,6 @@ enum zone_stat_item {
NUMA_LOCAL, /* allocation from local node */
NUMA_OTHER, /* allocation from other node */
#endif
- WORKINGSET_REFAULT,
- WORKINGSET_ACTIVATE,
- WORKINGSET_NODERECLAIM,
NR_ANON_TRANSPARENT_HUGEPAGES,
NR_FREE_CMA_PAGES,
NR_VM_ZONE_STAT_ITEMS };
@@ -160,6 +157,9 @@ enum node_stat_item {
NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */
NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */
NR_PAGES_SCANNED, /* pages scanned since last reclaim */
+ WORKINGSET_REFAULT,
+ WORKINGSET_ACTIVATE,
+ WORKINGSET_NODERECLAIM,
NR_VM_NODE_STAT_ITEMS
};
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 36897da22792..054ee50974c9 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -921,9 +921,6 @@ const char * const vmstat_text[] = {
"numa_local",
"numa_other",
#endif
- "workingset_refault",
- "workingset_activate",
- "workingset_nodereclaim",
"nr_anon_transparent_hugepages",
"nr_free_cma",
@@ -936,6 +933,9 @@ const char * const vmstat_text[] = {
"nr_isolated_anon",
"nr_isolated_file",
"nr_pages_scanned",
+ "workingset_refault",
+ "workingset_activate",
+ "workingset_nodereclaim",
/* enum writeback_stat_item counters */
"nr_dirty_threshold",
diff --git a/mm/workingset.c b/mm/workingset.c
index ca080cc11797..1cc71f1ca7fc 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -16,7 +16,7 @@
/*
* Double CLOCK lists
*
- * Per zone, two clock lists are maintained for file pages: the
+ * Per node, two clock lists are maintained for file pages: the
* inactive and the active list. Freshly faulted pages start out at
* the head of the inactive list and page reclaim scans pages from the
* tail. Pages that are accessed multiple times on the inactive list
@@ -141,48 +141,43 @@
*
* Implementation
*
- * For each zone's file LRU lists, a counter for inactive evictions
- * and activations is maintained (zone->inactive_age).
+ * For each node's file LRU lists, a counter for inactive evictions
+ * and activations is maintained (node->inactive_age).
*
* On eviction, a snapshot of this counter (along with some bits to
- * identify the zone) is stored in the now empty page cache radix tree
+ * identify the node) is stored in the now empty page cache radix tree
* slot of the evicted page. This is called a shadow entry.
*
* On cache misses for which there are shadow entries, an eligible
* refault distance will immediately activate the refaulting page.
*/
-static void *pack_shadow(unsigned long eviction, struct zone *zone)
+static void *pack_shadow(unsigned long eviction, struct pglist_data *pgdat)
{
- eviction = (eviction << NODES_SHIFT) | zone_to_nid(zone);
- eviction = (eviction << ZONES_SHIFT) | zone_idx(zone);
+ eviction = (eviction << NODES_SHIFT) | pgdat->node_id;
eviction = (eviction << RADIX_TREE_EXCEPTIONAL_SHIFT);
return (void *)(eviction | RADIX_TREE_EXCEPTIONAL_ENTRY);
}
static void unpack_shadow(void *shadow,
- struct zone **zone,
+ struct pglist_data **pgdat,
unsigned long *distance)
{
unsigned long entry = (unsigned long)shadow;
unsigned long eviction;
unsigned long refault;
unsigned long mask;
- int zid, nid;
+ int nid;
entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT;
- zid = entry & ((1UL << ZONES_SHIFT) - 1);
- entry >>= ZONES_SHIFT;
nid = entry & ((1UL << NODES_SHIFT) - 1);
entry >>= NODES_SHIFT;
eviction = entry;
- *zone = NODE_DATA(nid)->node_zones + zid;
-
- refault = atomic_long_read(&(*zone)->zone_pgdat->inactive_age);
- mask = ~0UL >> (NODES_SHIFT + ZONES_SHIFT +
- RADIX_TREE_EXCEPTIONAL_SHIFT);
+ *pgdat = NODE_DATA(nid);
+ refault = atomic_long_read(&(*pgdat)->inactive_age);
+ mask = ~0UL >> (NODES_SHIFT + RADIX_TREE_EXCEPTIONAL_SHIFT);
/*
* The unsigned subtraction here gives an accurate distance
* across inactive_age overflows in most cases.
@@ -212,11 +207,11 @@ static void unpack_shadow(void *shadow,
*/
void *workingset_eviction(struct address_space *mapping, struct page *page)
{
- struct zone *zone = page_zone(page);
+ struct pglist_data *pgdat = page_zone(page)->zone_pgdat;
unsigned long eviction;
- eviction = atomic_long_inc_return(&zone->zone_pgdat->inactive_age);
- return pack_shadow(eviction, zone);
+ eviction = atomic_long_inc_return(&pgdat->inactive_age);
+ return pack_shadow(eviction, pgdat);
}
/**
@@ -224,20 +219,20 @@ void *workingset_eviction(struct address_space *mapping, struct page *page)
* @shadow: shadow entry of the evicted page
*
* Calculates and evaluates the refault distance of the previously
- * evicted page in the context of the zone it was allocated in.
+ * evicted page in the context of the node it was allocated in.
*
* Returns %true if the page should be activated, %false otherwise.
*/
bool workingset_refault(void *shadow)
{
unsigned long refault_distance;
- struct zone *zone;
+ struct pglist_data *pgdat;
- unpack_shadow(shadow, &zone, &refault_distance);
- inc_zone_state(zone, WORKINGSET_REFAULT);
+ unpack_shadow(shadow, &pgdat, &refault_distance);
+ inc_node_state(pgdat, WORKINGSET_REFAULT);
- if (refault_distance <= node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE)) {
- inc_zone_state(zone, WORKINGSET_ACTIVATE);
+ if (refault_distance <= node_page_state(pgdat, NR_ACTIVE_FILE)) {
+ inc_node_state(pgdat, WORKINGSET_ACTIVATE);
return true;
}
return false;
@@ -356,7 +351,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
}
}
BUG_ON(node->count);
- inc_zone_state(page_zone(virt_to_page(node)), WORKINGSET_NODERECLAIM);
+ inc_node_state(page_zone(virt_to_page(node))->zone_pgdat, WORKINGSET_NODERECLAIM);
if (!__radix_tree_delete_node(&mapping->page_tree, node))
BUG();
--
2.3.5
--
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