linux-kernel - [PATCH] Use single threaded work queue for hid

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Message-ID: <20081110215150.GA8460@basil.nowhere.org>
Date:	Mon, 10 Nov 2008 22:51:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	jkosina@...e.cz, linux-kernel@...r.kernel.org
Subject: [PATCH] Use single threaded work queue for hid_compat

Use single threaded work queue for hid_compat

I doubt HID really needs to scale over multiple CPUs. So only use a
single threaded workqueue for HID_COMPAT. This avoids some excessive
thread use on systems with a larger number of CPUs.

Should still go into 2.6.28 if possible.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/hid/hid-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.28-rc4-test/drivers/hid/hid-core.c
===================================================================
--- linux-2.6.28-rc4-test.orig/drivers/hid/hid-core.c	2008-11-06 20:26:34.000000000 +0100
+++ linux-2.6.28-rc4-test/drivers/hid/hid-core.c	2008-11-10 22:36:49.000000000 +0100
@@ -1729,7 +1729,7 @@
 		goto err_bus;
 
 #ifdef CONFIG_HID_COMPAT
-	hid_compat_wq = create_workqueue("hid_compat");
+	hid_compat_wq = create_singlethread_workqueue("hid_compat");
 	if (!hid_compat_wq) {
 		hidraw_exit();
 		goto err;
--
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