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Btrfs: Change the congestion functions to meter the number of async submits as well

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The async submit workqueue was absorbing too many requests, leading to long
stalls where the async submitters were stalling.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-05-15 16:15:45 -04:00
parent 211c17f51f
commit cb03c743c6
2 changed files with 10 additions and 0 deletions
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1
fs/btrfs/ctree.h
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@ -522,6 +522,7 @@ struct btrfs_fs_info {
struct work_struct async_submit_work;
spinlock_t end_io_work_lock;
spinlock_t async_submit_work_lock;
atomic_t nr_async_submits;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
struct work_struct trans_work;

9
fs/btrfs/disk-io.c
View File

@ -453,6 +453,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
spin_lock(&fs_info->async_submit_work_lock);
list_add_tail(&async->list, &fs_info->async_submit_work_list);
atomic_inc(&fs_info->nr_async_submits);
spin_unlock(&fs_info->async_submit_work_lock);
queue_work(async_submit_workqueue, &fs_info->async_submit_work);
@ -906,10 +907,16 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
{
struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
int ret = 0;
int limit = 256 * info->fs_devices->open_devices;
struct list_head *cur;
struct btrfs_device *device;
struct backing_dev_info *bdi;
if ((bdi_bits & (1 << BDI_write_congested)) &&
atomic_read(&info->nr_async_submits) > limit) {
return 1;
}
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
if (!device->bdev)
@ -1117,6 +1124,7 @@ static void btrfs_async_submit_work(struct work_struct *work)
}
next = fs_info->async_submit_work_list.next;
list_del(next);
atomic_dec(&fs_info->nr_async_submits);
spin_unlock(&fs_info->async_submit_work_lock);
async = list_entry(next, struct async_submit_bio, list);
@ -1179,6 +1187,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
atomic_set(&fs_info->nr_async_submits, 0);
fs_info->sb = sb;
fs_info->max_extent = (u64)-1;
fs_info->max_inline = 8192 * 1024;