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Btrfs: Wait for async bio submissions to make some progress at queue time

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Before, the btrfs bdi congestion function was used to test for too many
async bios.  This keeps that check to throttle pdflush, but also
adds a check while queuing bios.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-08-20 13:39:41 -04:00
parent 4d1b5fb4d7
commit b64a2851ba
4 changed files with 27 additions and 10 deletions
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16
fs/btrfs/disk-io.c
View file

@ -429,7 +429,7 @@ int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
return 0;
}
static unsigned long async_submit_limit(struct btrfs_fs_info *info)
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
{
unsigned long limit = min_t(unsigned long,
info->workers.max_workers,
@ -439,7 +439,8 @@ static unsigned long async_submit_limit(struct btrfs_fs_info *info)
int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
{
return atomic_read(&info->nr_async_bios) > async_submit_limit(info);
return atomic_read(&info->nr_async_bios) >
btrfs_async_submit_limit(info);
}
static void run_one_async_submit(struct btrfs_work *work)
@ -451,12 +452,13 @@ static void run_one_async_submit(struct btrfs_work *work)
async = container_of(work, struct async_submit_bio, work);
fs_info = BTRFS_I(async->inode)->root->fs_info;
limit = async_submit_limit(fs_info);
limit = btrfs_async_submit_limit(fs_info);
limit = limit * 2 / 3;
atomic_dec(&fs_info->nr_async_submits);
if (atomic_read(&fs_info->nr_async_submits) < limit)
if (atomic_read(&fs_info->nr_async_submits) < limit &&
waitqueue_active(&fs_info->async_submit_wait))
wake_up(&fs_info->async_submit_wait);
async->submit_bio_hook(async->inode, async->rw, async->bio,
@ -469,7 +471,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
extent_submit_bio_hook_t *submit_bio_hook)
{
struct async_submit_bio *async;
int limit = async_submit_limit(fs_info);
int limit = btrfs_async_submit_limit(fs_info);
async = kmalloc(sizeof(*async), GFP_NOFS);
if (!async)
@ -1863,10 +1865,10 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
struct extent_io_tree *tree;
u64 num_dirty;
u64 start = 0;
unsigned long thresh = 12 * 1024 * 1024;
unsigned long thresh = 96 * 1024 * 1024;
tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
if (current_is_pdflush())
if (current_is_pdflush() || current->flags & PF_MEMALLOC)
return;
num_dirty = count_range_bits(tree, &start, (u64)-1,

1
fs/btrfs/disk-io.h
View file

@ -73,4 +73,5 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
int rw, struct bio *bio, int mirror_num,
extent_submit_bio_hook_t *submit_bio_hook);
int btrfs_congested_async(struct btrfs_fs_info *info, int iodone);
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
#endif

2
fs/btrfs/transaction.c
View file

@ -322,8 +322,6 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
if (ret)
break;
while(start <= end) {
if (btrfs_congested_async(root->fs_info, 0))
congestion_wait(WRITE, HZ/10);
cond_resched();
index = start >> PAGE_CACHE_SHIFT;

18
fs/btrfs/volumes.c
View file

@ -138,12 +138,18 @@ int run_scheduled_bios(struct btrfs_device *device)
{
struct bio *pending;
struct backing_dev_info *bdi;
struct btrfs_fs_info *fs_info;
struct bio *tail;
struct bio *cur;
int again = 0;
unsigned long num_run = 0;
unsigned long limit;
bdi = device->bdev->bd_inode->i_mapping->backing_dev_info;
fs_info = device->dev_root->fs_info;
limit = btrfs_async_submit_limit(fs_info);
limit = limit * 2 / 3;
loop:
spin_lock(&device->io_lock);
@ -179,7 +185,11 @@ loop:
cur = pending;
pending = pending->bi_next;
cur->bi_next = NULL;
atomic_dec(&device->dev_root->fs_info->nr_async_bios);
atomic_dec(&fs_info->nr_async_bios);
if (atomic_read(&fs_info->nr_async_bios) < limit &&
waitqueue_active(&fs_info->async_submit_wait))
wake_up(&fs_info->async_submit_wait);
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
bio_get(cur);
@ -2135,6 +2145,7 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
int rw, struct bio *bio)
{
int should_queue = 1;
unsigned long limit;
/* don't bother with additional async steps for reads, right now */
if (!(rw & (1 << BIO_RW))) {
@ -2171,6 +2182,11 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
if (should_queue)
btrfs_queue_worker(&root->fs_info->submit_workers,
&device->work);
limit = btrfs_async_submit_limit(root->fs_info);
wait_event_timeout(root->fs_info->async_submit_wait,
(atomic_read(&root->fs_info->nr_async_bios) < limit),
HZ/10);
return 0;
}