Btrfs: use percpu counter for fs_info->delalloc_bytes

fs_info->delalloc_bytes is accessed very frequently, so use percpu
counter instead of the u64 variant for it to reduce the lock
contention.

This patch also fixed the problem that we access the variant
without the lock protection.At worst, we would not flush the
delalloc inodes, and just return ENOSPC error when we still have
some free space in the fs.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

4 files changed, 26 insertions, 11 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 4c476281b66b..50def99f5379 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1392,6 +1392,7 @@ struct btrfs_fs_info {
          */
         struct list_head ordered_extents;
 
+        spinlock_t delalloc_lock;
         /*
          * all of the inodes that have delalloc bytes.  It is possible for
          * this list to be empty even when there is still dirty data=ordered
@@ -1452,7 +1453,10 @@ struct btrfs_fs_info {
 
         /* used to keep from writing metadata until there is a nice batch */
         struct percpu_counter dirty_metadata_bytes;
+        struct percpu_counter delalloc_bytes;
         s32 dirty_metadata_batch;
+        s32 delalloc_batch;
+
         struct list_head dirty_cowonly_roots;
 
         struct btrfs_fs_devices *fs_devices;
@@ -1468,9 +1472,6 @@ struct btrfs_fs_info {
 
         struct reloc_control *reloc_ctl;
 
-        spinlock_t delalloc_lock;
-        u64 delalloc_bytes;
-
         /* data_alloc_cluster is only used in ssd mode */
         struct btrfs_free_cluster data_alloc_cluster;
 
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 34ace168eebc..2c9498aefe86 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2010,10 +2010,16 @@ int open_ctree(struct super_block *sb,
         fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE *
                                         (1 + ilog2(nr_cpu_ids));
 
+        ret = percpu_counter_init(&fs_info->delalloc_bytes, 0);
+        if (ret) {
+                err = ret;
+                goto fail_dirty_metadata_bytes;
+        }
+
         fs_info->btree_inode = new_inode(sb);
         if (!fs_info->btree_inode) {
                 err = -ENOMEM;
-                goto fail_dirty_metadata_bytes;
+                goto fail_delalloc_bytes;
         }
 
         mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
@@ -2269,6 +2275,7 @@ int open_ctree(struct super_block *sb,
         sectorsize = btrfs_super_sectorsize(disk_super);
         stripesize = btrfs_super_stripesize(disk_super);
         fs_info->dirty_metadata_batch = leafsize * (1 + ilog2(nr_cpu_ids));
+        fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
 
         /*
          * mixed block groups end up with duplicate but slightly offset
@@ -2731,6 +2738,8 @@ fail_iput:
 
         invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
         iput(fs_info->btree_inode);
+fail_delalloc_bytes:
+        percpu_counter_destroy(&fs_info->delalloc_bytes);
 fail_dirty_metadata_bytes:
         percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
 fail_bdi:
@@ -3362,9 +3371,9 @@ int close_ctree(struct btrfs_root *root)
 
         btrfs_free_qgroup_config(root->fs_info);
 
-        if (fs_info->delalloc_bytes) {
-                printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
-                       (unsigned long long)fs_info->delalloc_bytes);
+        if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
+                printk(KERN_INFO "btrfs: at unmount delalloc count %lld\n",
+                       percpu_counter_sum(&fs_info->delalloc_bytes));
         }
 
         free_extent_buffer(fs_info->extent_root->node);
@@ -3412,6 +3421,7 @@ int close_ctree(struct btrfs_root *root)
         btrfs_mapping_tree_free(&fs_info->mapping_tree);
 
         percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
+        percpu_counter_destroy(&fs_info->delalloc_bytes);
         bdi_destroy(&fs_info->bdi);
         cleanup_srcu_struct(&fs_info->subvol_srcu);
 
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 174c4d5c692c..115d1646bf50 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3760,7 +3760,8 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
         space_info = block_rsv->space_info;
 
         smp_mb();
-        delalloc_bytes = root->fs_info->delalloc_bytes;
+        delalloc_bytes = percpu_counter_sum_positive(
+                                                &root->fs_info->delalloc_bytes);
         if (delalloc_bytes == 0) {
                 if (trans)
                         return;
@@ -3799,7 +3800,8 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
                                 break;
                 }
                 smp_mb();
-                delalloc_bytes = root->fs_info->delalloc_bytes;
+                delalloc_bytes = percpu_counter_sum_positive(
+                                                &root->fs_info->delalloc_bytes);
         }
 }
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fc8aa8bf80a1..24c0b7805fe1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1516,7 +1516,8 @@ static void btrfs_set_bit_hook(struct inode *inode,
 
                 spin_lock(&root->fs_info->delalloc_lock);
                 BTRFS_I(inode)->delalloc_bytes += len;
-                root->fs_info->delalloc_bytes += len;
+                __percpu_counter_add(&root->fs_info->delalloc_bytes, len,
+                                     root->fs_info->delalloc_batch);
                 if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
                         list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
                                       &root->fs_info->delalloc_inodes);
@@ -1557,7 +1558,8 @@ static void btrfs_clear_bit_hook(struct inode *inode,
                         btrfs_free_reserved_data_space(inode, len);
 
                 spin_lock(&root->fs_info->delalloc_lock);
-                root->fs_info->delalloc_bytes -= len;
+                __percpu_counter_add(&root->fs_info->delalloc_bytes, -len,
+                                     root->fs_info->delalloc_batch);
                 BTRFS_I(inode)->delalloc_bytes -= len;
 
                 if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 &&