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Subject[PATCH v3 21/21] mm: zone lru vectors interleaving
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Split zones into several lru vectors with pfn-based interleaving.
Thus we can redeuce lru_lock contention without using cgroups.

By default there 4 lru with 16Mb interleaving.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
include/linux/huge_mm.h | 3 ++
include/linux/memcontrol.h | 2 +-
include/linux/mm.h | 45 +++++++++++++++++++++++++++++------
include/linux/mmzone.h | 4 ++-
mm/Kconfig | 16 +++++++++++++
mm/internal.h | 19 ++++++++++++++-
mm/memcontrol.c | 56 ++++++++++++++++++++++++--------------------
mm/page_alloc.c | 7 +++---
mm/vmscan.c | 18 ++++++++++----
9 files changed, 124 insertions(+), 46 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 1b92129..3a45cb3 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -107,6 +107,9 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
#if HPAGE_PMD_ORDER > MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
+#if HPAGE_PMD_ORDER > CONFIG_PAGE_LRU_INTERLEAVING
+#error "zone lru interleaving order lower than huge page order"
+#endif
extern int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice);
extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c3e46b0..b137d4c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -199,7 +199,7 @@ static inline void mem_cgroup_uncharge_cache_page(struct page *page)
static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
struct mem_cgroup *memcg)
{
- return &zone->lruvec;
+ return zone->lruvec;
}

static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c6dc4ab..d14db10 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -728,12 +728,46 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
#endif
}

+#if CONFIG_PAGE_LRU_SPLIT == 1
+
+static inline int page_lruvec_id(struct page *page)
+{
+ return 0;
+}
+
+#else /* CONFIG_PAGE_LRU_SPLIT */
+
+static inline int page_lruvec_id(struct page *page)
+{
+
+ unsigned long pfn = page_to_pfn(page);
+
+ return (pfn >> CONFIG_PAGE_LRU_INTERLEAVING) % CONFIG_PAGE_LRU_SPLIT;
+}
+
+#endif /* CONFIG_PAGE_LRU_SPLIT */
+
#ifdef CONFIG_CGROUP_MEM_RES_CTLR

-/* Multiple lruvecs in zone */
+/* Dynamic page to lruvec mapping */

extern struct lruvec *page_lruvec(struct page *page);

+#else
+
+/* Fixed page to lruvecs mapping */
+
+static inline struct lruvec *page_lruvec(struct page *page)
+{
+ return page_zone(page)->lruvec + page_lruvec_id(page);
+}
+
+#endif
+
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR) || (CONFIG_PAGE_LRU_SPLIT != 1)
+
+/* Multiple lruvecs in zone */
+
static inline struct zone *lruvec_zone(struct lruvec *lruvec)
{
return lruvec->zone;
@@ -744,15 +778,10 @@ static inline struct pglist_data *lruvec_node(struct lruvec *lruvec)
return lruvec->node;
}

-#else /* CONFIG_CGROUP_MEM_RES_CTLR */
+#else /* defined(CONFIG_CGROUP_MEM_RES_CTLR) || (CONFIG_PAGE_LRU_SPLIT != 1) */

/* Single lruvec in zone */

-static inline struct lruvec *page_lruvec(struct page *page)
-{
- return &page_zone(page)->lruvec;
-}
-
static inline struct zone *lruvec_zone(struct lruvec *lruvec)
{
return container_of(lruvec, struct zone, lruvec);
@@ -763,7 +792,7 @@ static inline struct pglist_data *lruvec_node(struct lruvec *lruvec)
return lruvec_zone(lruvec)->zone_pgdat;
}

-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+#endif /* defined(CONFIG_CGROUP_MEM_RES_CTLR) || (CONFIG_PAGE_LRU_SPLIT != 1) */

/*
* Some inline functions in vmstat.h depend on page_zone()
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9880150..a52f423 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -311,7 +311,7 @@ struct lruvec {

struct zone_reclaim_stat reclaim_stat;

-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR) || (CONFIG_PAGE_LRU_SPLIT != 1)
struct zone *zone;
struct pglist_data *node;
#endif
@@ -388,7 +388,7 @@ struct zone {
ZONE_PADDING(_pad1_)

/* Fields commonly accessed by the page reclaim scanner */
- struct lruvec lruvec;
+ struct lruvec lruvec[CONFIG_PAGE_LRU_SPLIT];

unsigned long pages_scanned; /* since last reclaim */
unsigned long flags; /* zone flags, see below */
diff --git a/mm/Kconfig b/mm/Kconfig
index 2613c91..48ff866 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -183,6 +183,22 @@ config SPLIT_PTLOCK_CPUS
default "999999" if DEBUG_SPINLOCK || DEBUG_LOCK_ALLOC
default "4"

+config PAGE_LRU_SPLIT
+ int "Memory lru lists per zone"
+ default 4 if EXPERIMENTAL && SPARSEMEM_VMEMMAP
+ default 1
+ help
+ The number of lru lists in each memory zone for interleaving.
+ Allows to redeuce lru_lock contention, but adds some overhead.
+ Without SPARSEMEM_VMEMMAP might be costly. "1" means no split.
+
+config PAGE_LRU_INTERLEAVING
+ int "Memory lru lists interleaving page-order"
+ default 12
+ help
+ Page order for lru lists interleaving. By default 12 (16Mb).
+ Must be greater than huge-page order.
+ With CONFIG_PAGE_LRU_SPLIT=1 has no effect.
#
# support for memory compaction
config COMPACTION
diff --git a/mm/internal.h b/mm/internal.h
index 9a9fd53..f429911 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -13,6 +13,15 @@

#include <linux/mm.h>

+#define for_each_zone_id(zone_id) \
+ for ( zone_id = 0 ; zone_id < MAX_NR_ZONES ; zone_id++ )
+
+#define for_each_lruvec_id(lruvec_id) \
+ for ( lruvec_id = 0 ; lruvec_id < CONFIG_PAGE_LRU_SPLIT ; lruvec_id++ )
+
+#define for_each_zone_and_lruvec_id(zone_id, lruvec_id) \
+ for_each_zone_id(zone_id) for_each_lruvec_id(lruvec_id)
+
static inline void lock_lruvec(struct lruvec *lruvec, unsigned long *flags)
{
spin_lock_irqsave(&lruvec->lru_lock, *flags);
@@ -125,7 +134,15 @@ static inline void __wait_lruvec_unlock(struct lruvec *lruvec)
static inline struct lruvec *__relock_page_lruvec(struct lruvec *locked_lruvec,
struct page *page)
{
- /* Currently ony one lruvec per-zone */
+#if CONFIG_PAGE_LRU_SPLIT != 1
+ struct lruvec *lruvec = page_lruvec(page);
+
+ if (unlikely(lruvec != locked_lruvec)) {
+ spin_unlock(&locked_lruvec->lru_lock);
+ spin_lock(&lruvec->lru_lock);
+ locked_lruvec = lruvec;
+ }
+#endif
return locked_lruvec;
}

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fbeff85..59fe4b0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -134,7 +134,7 @@ struct mem_cgroup_reclaim_iter {
* per-zone information in memory controller.
*/
struct mem_cgroup_per_zone {
- struct lruvec lruvec;
+ struct lruvec lruvec[CONFIG_PAGE_LRU_SPLIT];

struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];

@@ -694,12 +694,15 @@ mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
struct mem_cgroup_per_zone *mz;
enum lru_list lru;
unsigned long ret = 0;
+ int lruvec_id;

mz = mem_cgroup_zoneinfo(memcg, nid, zid);

- for_each_lru_counter(lru) {
- if (BIT(lru) & lru_mask)
- ret += mz->lruvec.pages_count[lru];
+ for_each_lruvec_id(lruvec_id) {
+ for_each_lru_counter(lru) {
+ if (BIT(lru) & lru_mask)
+ ret += mz->lruvec[lruvec_id].pages_count[lru];
+ }
}
return ret;
}
@@ -995,7 +998,7 @@ out:
EXPORT_SYMBOL(mem_cgroup_count_vm_event);

/**
- * mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg
+ * mem_cgroup_zone_lruvec - get the array of lruvecs for a zone and memcg
* @zone: zone of the wanted lruvec
* @mem: memcg of the wanted lruvec
*
@@ -1009,10 +1012,10 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
struct mem_cgroup_per_zone *mz;

if (mem_cgroup_disabled())
- return &zone->lruvec;
+ return zone->lruvec;

mz = mem_cgroup_zoneinfo(memcg, zone_to_nid(zone), zone_idx(zone));
- return &mz->lruvec;
+ return mz->lruvec;
}

/**
@@ -1027,14 +1030,15 @@ struct lruvec *page_lruvec(struct page *page)
{
struct mem_cgroup_per_zone *mz;
struct page_cgroup *pc;
+ int lruvec_id = page_lruvec_id(page);

if (mem_cgroup_disabled())
- return &page_zone(page)->lruvec;
+ return page_zone(page)->lruvec + lruvec_id;

pc = lookup_page_cgroup(page);
mz = mem_cgroup_zoneinfo(pc->mem_cgroup,
page_to_nid(page), page_zonenum(page));
- return &mz->lruvec;
+ return mz->lruvec + lruvec_id;
}

/*
@@ -3495,7 +3499,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
* *And* this routine doesn't reclaim page itself, just removes page_cgroup.
*/
static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
- int node, int zid, enum lru_list lru)
+ int node, int zid, int lid, enum lru_list lru)
{
struct mem_cgroup_per_zone *mz;
unsigned long flags, loop;
@@ -3507,7 +3511,7 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,

zone = &NODE_DATA(node)->node_zones[zid];
mz = mem_cgroup_zoneinfo(memcg, node, zid);
- lruvec = &mz->lruvec;
+ lruvec = mz->lruvec + lid;
list = &lruvec->pages_lru[lru];
loop = lruvec->pages_count[lru];
/* give some margin against EBUSY etc...*/
@@ -3558,7 +3562,7 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
static int mem_cgroup_force_empty(struct mem_cgroup *memcg, bool free_all)
{
int ret;
- int node, zid, shrink;
+ int node, zid, lid, shrink;
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
struct cgroup *cgrp = memcg->css.cgroup;

@@ -3582,18 +3586,17 @@ move_account:
ret = 0;
mem_cgroup_start_move(memcg);
for_each_node_state(node, N_HIGH_MEMORY) {
- for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
+ for_each_zone_and_lruvec_id(zid, lid) {
enum lru_list lru;
for_each_lru(lru) {
ret = mem_cgroup_force_empty_list(memcg,
- node, zid, lru);
+ node, zid, lid, lru);
if (ret)
- break;
+ goto abort;
}
}
- if (ret)
- break;
}
+abort:
mem_cgroup_end_move(memcg);
memcg_oom_recover(memcg);
/* it seems parent cgroup doesn't have enough mem */
@@ -4061,16 +4064,16 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,

#ifdef CONFIG_DEBUG_VM
{
- int nid, zid;
+ int nid, zid, lid;
struct mem_cgroup_per_zone *mz;
struct zone_reclaim_stat *rs;
unsigned long recent_rotated[2] = {0, 0};
unsigned long recent_scanned[2] = {0, 0};

for_each_online_node(nid)
- for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+ for_each_zone_and_lruvec_id(zid, lid) {
mz = mem_cgroup_zoneinfo(memcg, nid, zid);
- rs = &mz->lruvec.reclaim_stat;
+ rs = &mz->lruvec[lid].reclaim_stat;

recent_rotated[0] += rs->recent_rotated[0];
recent_rotated[1] += rs->recent_rotated[1];
@@ -4618,7 +4621,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
struct mem_cgroup_per_node *pn;
struct mem_cgroup_per_zone *mz;
- int zone, tmp = node;
+ int zone, lruvec_id, tmp = node;
/*
* This routine is called against possible nodes.
* But it's BUG to call kmalloc() against offline node.
@@ -4635,8 +4638,9 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)

for (zone = 0; zone < MAX_NR_ZONES; zone++) {
mz = &pn->zoneinfo[zone];
- init_zone_lruvec(&NODE_DATA(node)->node_zones[zone],
- &mz->lruvec);
+ for_each_lruvec_id(lruvec_id)
+ init_zone_lruvec(&NODE_DATA(node)->node_zones[zone],
+ &mz->lruvec[lruvec_id]);
mz->usage_in_excess = 0;
mz->on_tree = false;
mz->memcg = memcg;
@@ -4648,13 +4652,13 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
struct mem_cgroup_per_node *pn = memcg->info.nodeinfo[node];
- int zone;
+ int zone, lruvec;

if (!pn)
return;

- for (zone = 0; zone < MAX_NR_ZONES; zone++)
- wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec);
+ for_each_zone_and_lruvec_id(zone, lruvec)
+ wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec[lruvec]);

kfree(pn);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index beadcc9..9b0cc92 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4297,7 +4297,7 @@ void init_zone_lruvec(struct zone *zone, struct lruvec *lruvec)
spin_lock_init(&lruvec->lru_lock);
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->pages_lru[lru]);
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR) || (CONFIG_PAGE_LRU_SPLIT != 1)
lruvec->node = zone->zone_pgdat;
lruvec->zone = zone;
#endif
@@ -4312,7 +4312,7 @@ void init_zone_lruvec(struct zone *zone, struct lruvec *lruvec)
static void __paginginit free_area_init_core(struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long *zholes_size)
{
- enum zone_type j;
+ enum zone_type j, lruvec_id;
int nid = pgdat->node_id;
unsigned long zone_start_pfn = pgdat->node_start_pfn;
int ret;
@@ -4374,7 +4374,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
zone->zone_pgdat = pgdat;

zone_pcp_init(zone);
- init_zone_lruvec(zone, &zone->lruvec);
+ for_each_lruvec_id(lruvec_id)
+ init_zone_lruvec(zone, &zone->lruvec[lruvec_id]);
zap_zone_vm_stats(zone);
zone->flags = 0;
if (!size)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index a1ff010..aaf2b0e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2202,12 +2202,14 @@ static void shrink_zone(int priority, struct zone *zone,
};
struct mem_cgroup *memcg;
struct lruvec *lruvec;
+ int lruvec_id;

memcg = mem_cgroup_iter(root, NULL, &reclaim);
do {
lruvec = mem_cgroup_zone_lruvec(zone, memcg);

- shrink_lruvec(priority, lruvec, sc);
+ for_each_lruvec_id(lruvec_id)
+ shrink_lruvec(priority, lruvec + lruvec_id, sc);

/*
* Limit reclaim has historically picked one memcg and
@@ -2529,6 +2531,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
.target_mem_cgroup = memcg,
};
struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+ int lruvec_id;

sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -2544,7 +2547,8 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
* will pick up pages from other mem cgroup's as well. We hack
* the priority and make it zero.
*/
- shrink_lruvec(0, lruvec, &sc);
+ for_each_lruvec_id(lruvec_id)
+ shrink_lruvec(0, lruvec + lruvec_id, &sc);

trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);

@@ -2599,6 +2603,7 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc,
int priority)
{
struct mem_cgroup *memcg;
+ int lruvec_id;

if (!total_swap_pages)
return;
@@ -2607,9 +2612,12 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc,
do {
struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

- if (inactive_anon_is_low(lruvec))
- shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
- sc, priority, 0);
+ for_each_lruvec_id(lruvec_id) {
+ if (inactive_anon_is_low(lruvec + lruvec_id))
+ shrink_active_list(SWAP_CLUSTER_MAX,
+ lruvec + lruvec_id,
+ sc, priority, 0);
+ }

memcg = mem_cgroup_iter(NULL, memcg, NULL);
} while (memcg);


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