[Cluster-devel] [DLM PATCH] DLM: Don't specify WQ_UNBOUND for the ast callback workqueue

[Bob Peterson <rpeterso@redhat.com>]

Hi,

This patch removes the WQ_UNBOUND flag (which implies WQ_HIGHPRI)
from the DLM's ast work queue, in favor of just WQ_HIGHPRI.
This has been shown to cause a 19 percent performance increase for
simultaneous inode creates on GFS2 with fs_mark.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index dcea1e3..07fed83 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -268,7 +268,7 @@ void dlm_callback_work(struct work_struct *work)
 int dlm_callback_start(struct dlm_ls *ls)
 {
 	ls->ls_callback_wq = alloc_workqueue("dlm_callback",
-					     WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
+					     WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
 	if (!ls->ls_callback_wq) {
 		log_print("can't start dlm_callback workqueue");
 		return -ENOMEM;