linux-kernel - Re: [tip:core/debug] debug lockups: Improve lockup detection

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Message-ID: <20090802204647.GC3986@elte.hu>
Date:	Sun, 2 Aug 2009 22:46:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	paulmck@...ux.vnet.ibm.com, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/debug] debug lockups: Improve lockup detection


* Andrew Morton <akpm@...ux-foundation.org> wrote:

>  #ifndef trigger_all_cpu_backtrace
> +#ifdef CONFIG_SMP
> +#warning This architecture is missing a trigger_all_cpu_backtrace() implementation
> +#endif
>  #define trigger_all_cpu_backtrace() do { } while (0)
>  #endif

I think a better solution will be to make this function return 1 if 
it generated a backtrace.

That way we can fall back to the generic schedule_work based 
codepath.

Albeit the best and cleanest solution would be to implement a 
workqueue based trigger_all_cpu_backtrace() __weak variant and throw 
away the workqueue bits from sysrq.c.

	Ingo

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