linux-kernel - [RFC PATCH v1 03/13] mm: add lock array to pgdat and batch fields to struct page

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Date:   Wed, 31 Jan 2018 18:04:03 -0500
From:   daniel.m.jordan@...cle.com
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     aaron.lu@...el.com, ak@...ux.intel.com, akpm@...ux-foundation.org,
        Dave.Dice@...cle.com, dave@...olabs.net,
        khandual@...ux.vnet.ibm.com, ldufour@...ux.vnet.ibm.com,
        mgorman@...e.de, mhocko@...nel.org, pasha.tatashin@...cle.com,
        steven.sistare@...cle.com, yossi.lev@...cle.com
Subject: [RFC PATCH v1 03/13] mm: add lock array to pgdat and batch fields to struct page

This patch simply adds the array of locks and struct page fields.
Ignore for now where the struct page fields are: we need to find a place
to put them that doesn't enlarge the struct.

Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
---
 include/linux/mm_types.h | 5 +++++
 include/linux/mmzone.h   | 7 +++++++
 mm/page_alloc.c          | 3 +++
 3 files changed, 15 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index cfd0ac4e5e0e..6e9d26f0cecf 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -190,6 +190,11 @@ struct page {
 		struct kmem_cache *slab_cache;	/* SL[AU]B: Pointer to slab */
 	};
 
+	struct {
+		unsigned lru_batch;
+		bool lru_sentinel;
+	};
+
 #ifdef CONFIG_MEMCG
 	struct mem_cgroup *mem_cgroup;
 #endif
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index c05529473b80..5ffb36b3f665 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -249,6 +249,11 @@ struct lruvec {
 #define LRU_ALL_ANON (BIT(LRU_INACTIVE_ANON) | BIT(LRU_ACTIVE_ANON))
 #define LRU_ALL	     ((1 << NR_LRU_LISTS) - 1)
 
+#define NUM_LRU_BATCH_LOCKS 32
+struct lru_batch_lock {
+	spinlock_t lock;
+} ____cacheline_aligned_in_smp;
+
 /* Isolate unmapped file */
 #define ISOLATE_UNMAPPED	((__force isolate_mode_t)0x2)
 /* Isolate for asynchronous migration */
@@ -715,6 +720,8 @@ typedef struct pglist_data {
 
 	unsigned long		flags;
 
+	struct lru_batch_lock lru_batch_locks[NUM_LRU_BATCH_LOCKS];
+
 	ZONE_PADDING(_pad2_)
 
 	/* Per-node vmstats */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d7078ed68b01..3248b48e11ca 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6070,6 +6070,7 @@ static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages,
  */
 static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 {
+	size_t i;
 	enum zone_type j;
 	int nid = pgdat->node_id;
 
@@ -6092,6 +6093,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 	pgdat_page_ext_init(pgdat);
 	spin_lock_init(&pgdat->lru_lock);
 	lruvec_init(node_lruvec(pgdat));
+	for (i = 0; i < NUM_LRU_BATCH_LOCKS; ++i)
+		spin_lock_init(&pgdat->lru_batch_locks[i].lock);
 
 	pgdat->per_cpu_nodestats = &boot_nodestats;
 
-- 
2.16.1