xfs: introduce an allocation workqueue

[deliverable/linux.git] / fs / xfs / xfs_super.c

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 06d23b976f4cce6b87623532a5cd7bd2f2e4181a..5484888d39c4ca1ee4925d5f0e435cea721958bc 100644 (file)
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1607,12 +1607,28 @@ xfs_init_workqueues(void)
        xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);
        if (!xfs_syncd_wq)
                return -ENOMEM;
+
+       /*
+        * The allocation workqueue can be used in memory reclaim situations
+        * (writepage path), and parallelism is only limited by the number of
+        * AGs in all the filesystems mounted. Hence use the default large
+        * max_active value for this workqueue.
+        */
+       xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0);
+       if (!xfs_alloc_wq)
+               goto out_destroy_syncd;
+
        return 0;
+
+out_destroy_syncd:
+       destroy_workqueue(xfs_syncd_wq);
+       return -ENOMEM;
 }
 
 STATIC void
 xfs_destroy_workqueues(void)
 {
+       destroy_workqueue(xfs_alloc_wq);
        destroy_workqueue(xfs_syncd_wq);
 }