linux-kernel - Re: [PATCH v7 4/8] sched: nominate preferred wakeup cpu

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Date:	Fri, 19 Dec 2008 14:38:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	yinghai@...nel.org, svaidy@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com,
	venkatesh.pallipadi@...el.com, a.p.zijlstra@...llo.nl,
	dipankar@...ibm.com, balbir@...ux.vnet.ibm.com,
	vatsa@...ux.vnet.ibm.com, ego@...ibm.com, andi@...stfloor.org,
	davecb@....com, tconnors@...ro.swin.edu.au, maxk@...lcomm.com,
	gregory.haskins@...il.com, pavel@...e.cz, rusty@...tcorp.com.au
Subject: Re: [PATCH v7 4/8] sched: nominate preferred wakeup cpu

On Fri, 19 Dec 2008 23:31:30 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > > [   74.013893]  <EOI> <0>Code: 8b 47 08 4a 8b 0c 00 48 85 c9 0f 84 c3 00 00 00 49 8b 47 10 4a 8b 04 00 48 8b 80 a8 00 00 00 48 85 c0 74 13 48 0f af 45 c8 31 d2 <48> f7 75 c0 49 89 c6 48 89 c6 eb 16 48 63 55 d0 48 8b 45 c8 45 
> > > [   74.013893] RIP  [<ffffffff802375d8>] tg_shares_up+0x113/0x1f1
> > > [   74.013893]  RSP <ffff88025e057d88>
> > > [   74.020022] ---[ end trace 2fc4046e394f2312 ]---
> > > [   74.020188] Kernel panic - not syncing: Fatal exception in interrupt
> > > 
> > > config: http://userweb.kernel.org/~akpm/config-akpm2.txt
> > > 
> > > I'll try hacking some div-by-zero avoidance into update_group_shares_cpu().
> > 
> > hm, weird - Yinghai noticed this crash in -tip and we have that patch 
> > zapped from all -*-next branches already.
> 
> I guess you applied Ken's patch from email and had it in -mm?

Nope.

> We have a 
> new version of that patch from Ken now based on Yinghai's bugreport - only 
> lightly tested for now.
> 
> 	Ingo
> 
> ----------->
> >From d71f5a7c8bf9cd7c74159a53e522e363f2eddaf5 Mon Sep 17 00:00:00 2001
> From: Ken Chen <kenchen@...gle.com>
> Date: Fri, 19 Dec 2008 10:11:50 -0800
> Subject: [PATCH] sched: fix uneven per-cpu task_group share distribution

linux-next has:

commit 6eed5aaacae0ced9a43a923633befd2c695d6620
Author: Ken Chen <kenchen@...gle.com>
Date:   Mon Dec 15 23:37:50 2008 -0800

    sched: fix uneven per-cpu task_group share distribution

so I guess we have a latency problem.
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