diff options
| author | Josef Bacik <josef@redhat.com> | 2011-01-21 22:10:01 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-01-31 22:27:28 +0100 |
| commit | b1953bcec95c189b1eea690a08e89646d7750bda (patch) | |
| tree | be7906f6568daecc6196433053ff0ea785b3d175 | |
| parent | Btrfs: handle no memory properly in prepare_pages (diff) | |
| download | linux-b1953bcec95c189b1eea690a08e89646d7750bda.tar.xz linux-b1953bcec95c189b1eea690a08e89646d7750bda.zip | |
Btrfs: make shrink_delalloc a little friendlier
Xfstests 224 will just sit there and spin for ever until eventually we give up
flushing delalloc and exit. On my box this took several hours. I could not
interrupt this process either, even though we use INTERRUPTIBLE. So do 2 things
1) Keep us from looping over and over again without reclaiming anything
2) If we get interrupted exit the loop
I tested this and the test now exits in a reasonable amount of time, and can be
interrupted with ctrl+c. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent-tree.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index ff6bbfd75cf7..f96641a93fc9 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3345,8 +3345,10 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, u64 reserved; u64 max_reclaim; u64 reclaimed = 0; + long time_left; int pause = 1; int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; + int loops = 0; block_rsv = &root->fs_info->delalloc_block_rsv; space_info = block_rsv->space_info; @@ -3359,7 +3361,7 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, max_reclaim = min(reserved, to_reclaim); - while (1) { + while (loops < 1024) { /* have the flusher threads jump in and do some IO */ smp_mb(); nr_pages = min_t(unsigned long, nr_pages, @@ -3367,8 +3369,12 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); spin_lock(&space_info->lock); - if (reserved > space_info->bytes_reserved) + if (reserved > space_info->bytes_reserved) { + loops = 0; reclaimed += reserved - space_info->bytes_reserved; + } else { + loops++; + } reserved = space_info->bytes_reserved; spin_unlock(&space_info->lock); @@ -3379,7 +3385,12 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, return -EAGAIN; __set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(pause); + time_left = schedule_timeout(pause); + + /* We were interrupted, exit */ + if (time_left) + break; + pause <<= 1; if (pause > HZ / 10) pause = HZ / 10; |