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Btrfs: make shrink_delalloc a little friendlier

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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>
This commit is contained in:
Josef Bacik 2011-01-21 21:10:01 +00:00 committed by Chris Mason
parent 7adf5dfbb3
commit b1953bcec9
1 changed files with 14 additions and 3 deletions
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17
fs/btrfs/extent-tree.c
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@ -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;