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Btrfs: don't commit the transaction in the async space flushing 

We're triggering a huge number of commits from
btrfs_async_reclaim_metadata_space.  These aren't really requried,
because everyone calling the async reclaim code is going to end up
triggering a commit on their own.

Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik 2015-02-18 13:58:15 -08:00 committed by Chris Mason
parent cb723e4919
commit 365c531377
1 changed files with 8 additions and 6 deletions
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14
fs/btrfs/extent-tree.c
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@ -4329,8 +4329,13 @@ btrfs_calc_reclaim_metadata_size(struct btrfs_root *root,
static inline int need_do_async_reclaim(struct btrfs_space_info *space_info,
struct btrfs_fs_info *fs_info, u64 used)
{
return (used >= div_factor_fine(space_info->total_bytes, 98) &&
!btrfs_fs_closing(fs_info) &&
u64 thresh = div_factor_fine(space_info->total_bytes, 98);
/* If we're just plain full then async reclaim just slows us down. */
if (space_info->bytes_used >= thresh)
return 0;
return (used >= thresh && !btrfs_fs_closing(fs_info) &&
!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
}
@ -4385,10 +4390,7 @@ static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
if (!btrfs_need_do_async_reclaim(space_info, fs_info,
flush_state))
return;
} while (flush_state <= COMMIT_TRANS);
if (btrfs_need_do_async_reclaim(space_info, fs_info, flush_state))
queue_work(system_unbound_wq, work);
} while (flush_state < COMMIT_TRANS);
}
void btrfs_init_async_reclaim_work(struct work_struct *work)