linux-kernel - Re: [BUG] Cpuset: dynamic sched domain crash on

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Message-ID: <20060720230909.A4984@unix-os.sc.intel.com>
Date:	Thu, 20 Jul 2006 23:09:09 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Paul Jackson <pj@....com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>, Simon.Derr@...l.net,
	linux-kernel@...r.kernel.org, Dimitri Sivanich <sivanich@....com>
Subject: Re: [BUG] Cpuset: dynamic sched domain crash on > 16 cpu systems.

Paul,

I don't have these type of systems. So can you please check if the appended
patch fixes your issue.

thanks,
suresh

--

Use the correct groups while initializing sched groups power for
allnodes_domain. This fixes the crash observed while creating
exclusive cpusets.

Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

--- linux-2.6.18-rc1/kernel/sched.c~	2006-07-20 20:54:44.425601384 -0700
+++ linux-2.6.18-rc1/kernel/sched.c	2006-07-20 21:05:05.535178376 -0700
@@ -6457,7 +6457,12 @@ static int build_sched_domains(const cpu
 	for (i = 0; i < MAX_NUMNODES; i++)
 		init_numa_sched_groups_power(sched_group_nodes[i]);
 
-	init_numa_sched_groups_power(sched_group_allnodes);
+	if (sched_group_allnodes) {
+		int group = cpu_to_allnodes_group(first_cpu(*cpu_map));
+		struct sched_group *sg = &sched_group_allnodes[group];
+
+		init_numa_sched_groups_power(sg);
+	}
 #endif
 
 	/* Attach the domains */
-
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