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Btrfs: Count async bios separately from async checksum work items 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-08-15 15:34:15 -04:00
parent b720d20952
commit 0986fe9eac
3 changed files with 26 additions and 6 deletions
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1
fs/btrfs/ctree.h
View File

@ -544,6 +544,7 @@ struct btrfs_fs_info {
struct list_head hashers;
struct list_head dead_roots;
atomic_t nr_async_submits;
atomic_t nr_async_bios;
/*
* this is used by the balancing code to wait for all the pending

25
fs/btrfs/disk-io.c
View File

@ -429,6 +429,21 @@ int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
return 0;
}
static int congested_async(struct btrfs_fs_info *info, int iodone)
{
int limit = 256 * info->fs_devices->open_devices;
if (iodone)
limit = (limit * 3) / 2;
if (atomic_read(&info->nr_async_submits) > limit)
return 1;
limit = 8192 * info->fs_devices->open_devices;
if (iodone)
limit = (limit * 3) / 2;
return atomic_read(&info->nr_async_bios) > limit;
}
static void run_one_async_submit(struct btrfs_work *work)
{
struct btrfs_fs_info *fs_info;
@ -437,6 +452,11 @@ 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;
atomic_dec(&fs_info->nr_async_submits);
if ((async->bio->bi_rw & (1 << BIO_RW)) &&
!congested_async(fs_info, 1)) {
clear_bdi_congested(&fs_info->bdi, WRITE);
}
async->submit_bio_hook(async->inode, async->rw, async->bio,
async->mirror_num);
kfree(async);
@ -938,15 +958,13 @@ 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) {
congested_async(info, 0))
return 1;
}
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
@ -1250,6 +1268,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
atomic_set(&fs_info->nr_async_submits, 0);
atomic_set(&fs_info->nr_async_bios, 0);
atomic_set(&fs_info->throttles, 0);
atomic_set(&fs_info->throttle_gen, 0);
fs_info->sb = sb;

6
fs/btrfs/volumes.c
View File

@ -179,7 +179,7 @@ loop:
cur = pending;
pending = pending->bi_next;
cur->bi_next = NULL;
atomic_dec(&device->dev_root->fs_info->nr_async_submits);
atomic_dec(&device->dev_root->fs_info->nr_async_bios);
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
bio_get(cur);
@ -2145,12 +2145,12 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
}
/*
* nr_async_sumbits allows us to reliably return congestion to the
* nr_async_bios allows us to reliably return congestion to the
* higher layers. Otherwise, the async bio makes it appear we have
* made progress against dirty pages when we've really just put it
* on a queue for later
*/
atomic_inc(&root->fs_info->nr_async_submits);
atomic_inc(&root->fs_info->nr_async_bios);
WARN_ON(bio->bi_next);
bio->bi_next = NULL;
bio->bi_rw |= rw;