From 44734ed1ca0c2e66479cedbf773627a9b5a31364 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 28 Sep 2012 16:04:19 -0400 Subject: [PATCH] Btrfs: don't commit instead of overcommitting I don't think we have the same problem that this was supposed to fix originally since we can allocate chunks in the enospc path now. This code is causing us to constantly commit the transaction as we get close to using all of our available space in our currently allocated chunks, instead of allocating another chunk and carrying on with life, which is not nice for performance. Thanks, Signed-off-by: Josef Bacik --- fs/btrfs/extent-tree.c | 34 ++++++---------------------------- 1 file changed, 6 insertions(+), 28 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index ca4aad96f814..3d3e2c17d8d1 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3907,7 +3907,6 @@ static int reserve_metadata_bytes(struct btrfs_root *root, int flush_state = FLUSH_DELAYED_ITEMS_NR; int ret = 0; bool flushing = false; - bool committed = false; again: ret = 0; @@ -3970,33 +3969,12 @@ static int reserve_metadata_bytes(struct btrfs_root *root, (orig_bytes * 2); } - if (ret) { - u64 avail; - - /* - * If we have a lot of space that's pinned, don't bother doing - * the overcommit dance yet and just commit the transaction. - */ - avail = (space_info->total_bytes - space_info->bytes_used) * 8; - do_div(avail, 10); - if (space_info->bytes_pinned >= avail && flush && !committed) { - space_info->flush = 1; - flushing = true; - spin_unlock(&space_info->lock); - ret = may_commit_transaction(root, space_info, - orig_bytes, 1); - if (ret) - goto out; - committed = true; - goto again; - } - - if (can_overcommit(root, space_info, orig_bytes, flush)) { - space_info->bytes_may_use += orig_bytes; - trace_btrfs_space_reservation(root->fs_info, - "space_info", space_info->flags, orig_bytes, 1); - ret = 0; - } + if (ret && can_overcommit(root, space_info, orig_bytes, flush)) { + space_info->bytes_may_use += orig_bytes; + trace_btrfs_space_reservation(root->fs_info, "space_info", + space_info->flags, orig_bytes, + 1); + ret = 0; } /* -- GitLab