From bc25c9325b0e5ced897b9820dad239539d561ec9 Mon Sep 17 00:00:00 2001 From: Chunwei Chen Date: Tue, 13 May 2014 10:36:35 +0800 Subject: 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 Signed-off-by: Brian Behlendorf Closes #2270 --- include/sys/vdev_file.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/sys') 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 -- cgit v1.2.3