f2fs: use percpu_counter for page counters

This patch substitutes percpu_counter for atomic_counter when counting
various types of pages.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/debug.c

@@ -144,6 +144,7 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
 	si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 	si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 	si->base_mem += sizeof(*sbi->ckpt);
+	si->base_mem += sizeof(struct percpu_counter) * NR_COUNT_TYPE;
 
 	/* build sm */
 	si->base_mem += sizeof(struct f2fs_sm_info);
@@ -299,15 +300,15 @@ static int stat_show(struct seq_file *s, void *v)
 		seq_printf(s, "  - Inner Struct Count: tree: %d(%d), node: %d\n",
 				si->ext_tree, si->zombie_tree, si->ext_node);
 		seq_puts(s, "\nBalancing F2FS Async:\n");
-		seq_printf(s, "  - inmem: %4d, wb_bios: %4d\n",
+		seq_printf(s, "  - inmem: %4lld, wb_bios: %4d\n",
 			   si->inmem_pages, si->wb_bios);
-		seq_printf(s, "  - nodes: %4d in %4d\n",
+		seq_printf(s, "  - nodes: %4lld in %4d\n",
 			   si->ndirty_node, si->node_pages);
-		seq_printf(s, "  - dents: %4d in dirs:%4d\n",
+		seq_printf(s, "  - dents: %4lld in dirs:%4d\n",
 			   si->ndirty_dent, si->ndirty_dirs);
-		seq_printf(s, "  - datas: %4d in files:%4d\n",
+		seq_printf(s, "  - datas: %4lld in files:%4d\n",
 			   si->ndirty_data, si->ndirty_files);
-		seq_printf(s, "  - meta: %4d in %4d\n",
+		seq_printf(s, "  - meta: %4lld in %4d\n",
 			   si->ndirty_meta, si->meta_pages);
 		seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 			   si->dirty_nats, si->nats, si->dirty_sits, si->sits);

fs/f2fs/f2fs.h

@@ -813,7 +813,9 @@ struct f2fs_sb_info {
 	block_t last_valid_block_count;		/* for recovery */
 	u32 s_next_generation;			/* for NFS support */
 	atomic_t nr_wb_bios;			/* # of writeback bios */
-	atomic_t nr_pages[NR_COUNT_TYPE];	/* # of pages, see count_type */
+
+	/* # of pages, see count_type */
+	struct percpu_counter nr_pages[NR_COUNT_TYPE];
 
 	struct f2fs_mount_info mount_opt;	/* mount options */
 
@@ -1158,7 +1160,7 @@ static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
 
 static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
 {
-	atomic_inc(&sbi->nr_pages[count_type]);
+	percpu_counter_inc(&sbi->nr_pages[count_type]);
 	set_sbi_flag(sbi, SBI_IS_DIRTY);
 }
 
@@ -1171,7 +1173,7 @@ static inline void inode_inc_dirty_pages(struct inode *inode)
 
 static inline void dec_page_count(struct f2fs_sb_info *sbi, int count_type)
 {
-	atomic_dec(&sbi->nr_pages[count_type]);
+	percpu_counter_dec(&sbi->nr_pages[count_type]);
 }
 
 static inline void inode_dec_dirty_pages(struct inode *inode)
@@ -1185,9 +1187,9 @@ static inline void inode_dec_dirty_pages(struct inode *inode)
 				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA);
 }
 
-static inline int get_pages(struct f2fs_sb_info *sbi, int count_type)
+static inline s64 get_pages(struct f2fs_sb_info *sbi, int count_type)
 {
-	return atomic_read(&sbi->nr_pages[count_type]);
+	return percpu_counter_sum_positive(&sbi->nr_pages[count_type]);
 }
 
 static inline int get_dirty_pages(struct inode *inode)
@@ -1198,8 +1200,10 @@ static inline int get_dirty_pages(struct inode *inode)
 static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
 {
 	unsigned int pages_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;
-	return ((get_pages(sbi, block_type) + pages_per_sec - 1)
-			>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
+	unsigned int segs = (get_pages(sbi, block_type) + pages_per_sec - 1) >>
+						sbi->log_blocks_per_seg;
+
+	return segs / sbi->segs_per_sec;
 }
 
 static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
@@ -2013,11 +2017,11 @@ struct f2fs_stat_info {
 	unsigned long long hit_largest, hit_cached, hit_rbtree;
 	unsigned long long hit_total, total_ext;
 	int ext_tree, zombie_tree, ext_node;
-	int ndirty_node, ndirty_meta;
-	int ndirty_dent, ndirty_dirs, ndirty_data, ndirty_files;
+	s64 ndirty_node, ndirty_dent, ndirty_meta, ndirty_data, inmem_pages;
+	unsigned int ndirty_dirs, ndirty_files;
 	int nats, dirty_nats, sits, dirty_sits, fnids;
 	int total_count, utilization;
-	int bg_gc, inmem_pages, wb_bios;
+	int bg_gc, wb_bios;
 	int inline_xattr, inline_inode, inline_dir, orphans;
 	unsigned int valid_count, valid_node_count, valid_inode_count;
 	unsigned int bimodal, avg_vblocks;

fs/f2fs/super.c

@@ -606,6 +606,14 @@ static void f2fs_destroy_inode(struct inode *inode)
 	call_rcu(&inode->i_rcu, f2fs_i_callback);
 }
 
+static void destroy_percpu_info(struct f2fs_sb_info *sbi)
+{
+	int i;
+
+	for (i = 0; i < NR_COUNT_TYPE; i++)
+		percpu_counter_destroy(&sbi->nr_pages[i]);
+}
+
 static void f2fs_put_super(struct super_block *sb)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(sb);
@@ -666,6 +674,8 @@ static void f2fs_put_super(struct super_block *sb)
 	if (sbi->s_chksum_driver)
 		crypto_free_shash(sbi->s_chksum_driver);
 	kfree(sbi->raw_super);
+
+	destroy_percpu_info(sbi);
 	kfree(sbi);
 }
 
@@ -1324,7 +1334,6 @@ int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 static void init_sb_info(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_super_block *raw_super = sbi->raw_super;
-	int i;
 
 	sbi->log_sectors_per_block =
 		le32_to_cpu(raw_super->log_sectors_per_block);
@@ -1344,9 +1353,6 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
 	sbi->cur_victim_sec = NULL_SECNO;
 	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 
-	for (i = 0; i < NR_COUNT_TYPE; i++)
-		atomic_set(&sbi->nr_pages[i], 0);
-
 	sbi->dir_level = DEF_DIR_LEVEL;
 	sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
 	sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
@@ -1362,6 +1368,18 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
 #endif
 }
 
+static int init_percpu_info(struct f2fs_sb_info *sbi)
+{
+	int i, err;
+
+	for (i = 0; i < NR_COUNT_TYPE; i++) {
+		err = percpu_counter_init(&sbi->nr_pages[i], 0, GFP_KERNEL);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
 /*
  * Read f2fs raw super block.
  * Because we have two copies of super block, so read both of them
@@ -1552,6 +1570,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	init_waitqueue_head(&sbi->cp_wait);
 	init_sb_info(sbi);
 
+	err = init_percpu_info(sbi);
+	if (err)
+		goto free_options;
+
 	/* get an inode for meta space */
 	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 	if (IS_ERR(sbi->meta_inode)) {
@@ -1754,6 +1776,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	make_bad_inode(sbi->meta_inode);
 	iput(sbi->meta_inode);
 free_options:
+	destroy_percpu_info(sbi);
 	kfree(options);
 free_sb_buf:
 	kfree(raw_super);

include/trace/events/f2fs.h

@@ -1275,14 +1275,14 @@ TRACE_EVENT(f2fs_destroy_extent_tree,
 
 DECLARE_EVENT_CLASS(f2fs_sync_dirty_inodes,
 
-	TP_PROTO(struct super_block *sb, int type, int count),
+	TP_PROTO(struct super_block *sb, int type, s64 count),
 
 	TP_ARGS(sb, type, count),
 
 	TP_STRUCT__entry(
 		__field(dev_t, dev)
 		__field(int, type)
-		__field(int, count)
+		__field(s64, count)
 	),
 
 	TP_fast_assign(
@@ -1291,7 +1291,7 @@ DECLARE_EVENT_CLASS(f2fs_sync_dirty_inodes,
 		__entry->count	= count;
 	),
 
-	TP_printk("dev = (%d,%d), %s, dirty count = %d",
+	TP_printk("dev = (%d,%d), %s, dirty count = %lld",
 		show_dev(__entry),
 		show_file_type(__entry->type),
 		__entry->count)
@@ -1299,14 +1299,14 @@ DECLARE_EVENT_CLASS(f2fs_sync_dirty_inodes,
 
 DEFINE_EVENT(f2fs_sync_dirty_inodes, f2fs_sync_dirty_inodes_enter,
 
-	TP_PROTO(struct super_block *sb, int type, int count),
+	TP_PROTO(struct super_block *sb, int type, s64 count),
 
 	TP_ARGS(sb, type, count)
 );
 
 DEFINE_EVENT(f2fs_sync_dirty_inodes, f2fs_sync_dirty_inodes_exit,
 
-	TP_PROTO(struct super_block *sb, int type, int count),
+	TP_PROTO(struct super_block *sb, int type, s64 count),
 
 	TP_ARGS(sb, type, count)
 );