linux-ext4 - Re: [patch 003/152] jbd: fix commit of ordered data buffers

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Message-ID: <20060929212639.GA14744@elte.hu>
Date:	Fri, 29 Sep 2006 23:26:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	Andi Kleen <ak@...e.de>, Badari Pulavarty <pbadari@...ibm.com>,
	Jan Kara <jack@...e.cz>, torvalds@...l.org, stable@...nel.org,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [patch 003/152] jbd: fix commit of ordered data buffers

* Andrew Morton <akpm@...l.org> wrote:

> +void __trigger_all_cpu_backtrace(void)
> +{
> +	backtrace_mask = CPU_MASK_ALL;
> +}

i'd suggest cpu_online_map, i also added a busy-loop to wait for the 
backtrace_mask to go back to 0. That way we get a consistent dump all 
across. (as the NMI will dump on this CPU too)

if the NMI isnt working on some CPU, the wait might be quite long ;-) 
But it's not a big issue i think as the system is likely hosed already.

	Ingo
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