linux-kernel - Re: [PATCH 3/5] Use next_balance instead of last

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Message-ID: <Pine.LNX.4.64.0610260924440.16978@schroedinger.engr.sgi.com>
Date:	Thu, 26 Oct 2006 09:44:49 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	akpm@...l.org, Peter Williams <pwil3058@...pond.net.au>,
	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Chinner <dgc@....com>, Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 3/5] Use next_balance instead of last_balance

On Thu, 26 Oct 2006, Nick Piggin wrote:

> Actually, it is wrong, so nack.
> 
> You didn't take into account that balance_interval may have changed,
> and so might the idle status.

Hmmmm... We change the point at which we calculate the interval relative 
to load balancing. So move it after the load balance. This also avoids 
having to do the calculation if the sched_domain has not expired.

Want a new rollup/testing cycle for all of this?

Index: linux-2.6.19-rc3/kernel/sched.c
===================================================================
--- linux-2.6.19-rc3.orig/kernel/sched.c	2006-10-26 11:31:04.000000000 -0500
+++ linux-2.6.19-rc3/kernel/sched.c	2006-10-26 11:41:07.129561438 -0500
@@ -2867,15 +2867,6 @@ static void rebalance_domains(unsigned l
 		if (!(sd->flags & SD_LOAD_BALANCE))
 			continue;
 
-		interval = sd->balance_interval;
-		if (idle != SCHED_IDLE)
-			interval *= sd->busy_factor;
-
-		/* scale ms to jiffies */
-		interval = msecs_to_jiffies(interval);
-		if (unlikely(!interval))
-			interval = 1;
-
 		if (jiffies >= sd->next_balance) {
 			if (load_balance(this_cpu, this_rq, sd, idle)) {
 				/*
@@ -2885,6 +2876,14 @@ static void rebalance_domains(unsigned l
 				 */
 				idle = NOT_IDLE;
 			}
+			interval = sd->balance_interval;
+			if (idle != SCHED_IDLE)
+				interval *= sd->busy_factor;
+
+			/* scale ms to jiffies */
+			interval = msecs_to_jiffies(interval);
+			if (unlikely(!interval))
+				interval = 1;
 			sd->next_balance += interval;
 		}
 		next_balance = min(next_balance, sd->next_balance);
-
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