Re: [Patch] don't kick ALB in the presence of pinned task

[Siddha, Suresh B]

On Tue, Aug 02, 2005 at 04:09:17PM +1000, Nick Piggin wrote:
> I have a patch here which I still need to do more testing with,
> which might help performance on HT systems.
> 
> I found that idle siblings could cause SMP and NUMA balancing to
> be too aggressive in some cases.
> -- 
> If an idle sibling of an HT queue encounters a busy sibling, then
> make higher level load balancing of the non-idle variety.

Makes sense and patch looks good. Please push this minor comment fix along
with your patch. Thanks.

--- linux-2.6.13-rc4/kernel/sched.c~	2005-08-02 13:36:34.804764128 -0700
+++ linux-2.6.13-rc4/kernel/sched.c	2005-08-02 13:38:00.689707632 -0700
@@ -2316,7 +2316,9 @@
 
 		if (j - sd->last_balance >= interval) {
 			if (load_balance(this_cpu, this_rq, sd, idle)) {
-				/* We've pulled tasks over so no longer idle */
+				/* We've pulled tasks over so no longer idle
+				 * or one of our SMT sibling is not idle.
+				 */
 				idle = NOT_IDLE;
 			}
 			sd->last_balance += interval;
-
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