diff options
| author | Chunwei Chen <[email protected]> | 2014-05-13 10:36:35 +0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2014-05-14 16:20:21 -0700 |
| commit | bc25c9325b0e5ced897b9820dad239539d561ec9 (patch) | |
| tree | dd7a9bf76d0f0aa232ce2eaaa61c083a5238edc9 /include | |
| parent | 2c33b9127569ad62b4cfe7dd4f651ceeee3d005c (diff) | |
Use a dedicated taskq for vdev_file
Originally, vdev_file used system_taskq. This would cause a deadlock,
especially on system with few CPUs. The reason is that the prefetcher
threads, which are on system_taskq, will sometimes be blocked waiting
for I/O to finish. If the prefetcher threads consume all the tasks in
system_taskq, the I/O cannot be served and thus results in a deadlock.
We fix this by creating a dedicated vdev_file_taskq for vdev_file I/O.
Signed-off-by: Chunwei Chen <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #2270
Diffstat (limited to 'include')
| -rw-r--r-- | include/sys/vdev_file.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sys/vdev_file.h b/include/sys/vdev_file.h index b4d40f9df..cf38a86af 100644 --- a/include/sys/vdev_file.h +++ b/include/sys/vdev_file.h @@ -39,6 +39,9 @@ typedef struct vdev_file { vnode_t *vf_vnode; } vdev_file_t; +extern void vdev_file_init(void); +extern void vdev_file_fini(void); + #ifdef __cplusplus } #endif |