linux-kernel - Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched

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Date:	Wed, 22 Dec 2010 15:11:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Miklos Vajna <vmiklos@...galware.org>
Cc:	Mike Galbraith <efault@....de>,
	shenghui <crosslonelyover@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] avoid race condition in pick_next_task_fair in
 kernel/sched_fair.c

On Wed, 2010-12-22 at 15:00 +0100, Peter Zijlstra wrote:
> On Wed, 2010-12-22 at 14:31 +0100, Miklos Vajna wrote:
> > 
> > http://frugalware.org/~vmiklos/files/systemd.img
> > 
> > Here is how I started it:
> > 
> > qemu-kvm -vnc :0 -m 1G -hda systemd.img 
> 
> awesome, thanks!
> 
> I started it with something like: 
>  qemu -kernel foo-build/arch/x86/boot/bzImage -append "root=/dev/sda1
> debug sched_debug ignore_loglevel sysrq_always_enabled console=ttyS0"
> -hda systemd.img -serial stdio -m 1G
> 
> Where foo-build/ contains a kernel build using your .config.
> 
> I'll have a poke at it..

Hrm,. its not really wanting to start properly..

---
EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
Freeing unused kernel memory: 520k freed
EXT4-fs (sda1): re-mounted. Opts: (null)
md: stopping all md devices.
Restarting system.
machine restart
---

Does it _require_ initrd like muck? Or are there some modules that need
to get built-in in order for the thing to boot?

This is an utter lack of error reporting here, no idea what's wrong.
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