We can preallocate the node so insertion does not have to do that under
the lock. The GFP flags for the global radix tree are initialized to
GFP_NOFS & ~__GFP_DIRECT_RECLAIM
but we can use GFP_KERNEL, because readahead is optional and not on any
critical writeout path.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/disk-io.c | 2 +-
fs/btrfs/reada.c | 7 +++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 08b74daf35d0..1d4c30327247 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2693,7 +2693,7 @@ int open_ctree(struct super_block *sb,
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
/* readahead state */
- INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
+ INIT_RADIX_TREE(&fs_info->reada_tree, GFP_KERNEL);
spin_lock_init(&fs_info->reada_lock);
fs_info->thread_pool_size = min_t(unsigned long,
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index dd78af5d265d..4c5a9b241cab 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -391,6 +391,10 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
goto error;
}
+ ret = radix_tree_preload(GFP_KERNEL);
+ if (ret)
+ goto error;
+
/* insert extent in reada_tree + all per-device trees, all or nothing */
btrfs_dev_replace_lock(&fs_info->dev_replace, 0);
spin_lock(&fs_info->reada_lock);
@@ -400,13 +404,16 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+ radix_tree_preload_end();
goto error;
}
if (ret) {
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+ radix_tree_preload_end();
goto error;
}
+ radix_tree_preload_end();
prev_dev = NULL;
dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(
&fs_info->dev_replace);
--
2.12.0
--
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