linux-kernel - Re: [tip:sched/numa] sched/numa: Introduce sys_numa

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Date:	Mon, 21 May 2012 19:42:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...nel.org>
cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	pjt@...gle.com, cl@...ux.com, riel@...hat.com,
	bharata.rao@...il.com, akpm@...ux-foundation.org,
	Lee.Schermerhorn@...com, aarcange@...hat.com, danms@...ibm.com,
	suresh.b.siddha@...el.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/numa] sched/numa: Introduce sys_numa_{t,m}bind()

On Mon, 21 May 2012, David Rientjes wrote:

> [    0.602181] divide error: 0000 [#1] SMP 
> [    0.606159] CPU 0 
> [    0.608003] Modules linked in:
> [    0.611266] 
> [    0.612767] Pid: 1, comm: swapper/0 Not tainted 3.4.0 #1
> [    0.620912] RIP: 0010:[<ffffffff810af9ab>]  [<ffffffff810af9ab>] update_sd_lb_stats+0x38b/0x740

This is 

4ec4412e kernel/sched/fair.c 3876)      if (local_group) {
bd939f45 kernel/sched/fair.c 3877)              if (env->idle != CPU_NEWLY_IDLE) {
04f733b4 kernel/sched/fair.c 3878)                      if (balance_cpu != env->dst_cpu) {
4ec4412e kernel/sched/fair.c 3879)                              *balance = 0;
4ec4412e kernel/sched/fair.c 3880)                              return;
4ec4412e kernel/sched/fair.c 3881)                      }
bd939f45 kernel/sched/fair.c 3882)                      update_group_power(env->sd, env->dst_cpu);
4ec4412e kernel/sched/fair.c 3883)              } else if (time_after_eq(jiffies, group->sgp->next_update))
bd939f45 kernel/sched/fair.c 3884)                      update_group_power(env->sd, env->dst_cpu);
1e3c88bd kernel/sched_fair.c 3885)      }
1e3c88bd kernel/sched_fair.c 3886) 
1e3c88bd kernel/sched_fair.c 3887)      /* Adjust by relative CPU power of the group */
9c3f75cb kernel/sched_fair.c 3888)      sgs->avg_load = (sgs->group_load*SCHED_POWER_SCALE) / group->sgp->power;

the divide of group->sgp->power.  This doesn't happen when reverting back 
to sched/urgent at 30b4e9eb783d ("sched: Fix KVM and ia64 boot crash due 
to sched_groups circular linked list assumption").  Let me know if you'd 
like a bisect if the problem isn't immediately obvious.
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