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

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Message-ID: <20060929191759.GA19304@elte.hu>
Date:	Fri, 29 Sep 2006 21:18:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	Badari Pulavarty <pbadari@...ibm.com>, Jan Kara <jack@...e.cz>,
	torvalds@...l.org, stable@...nel.org,
	ext4 <linux-ext4@...r.kernel.org>, Andi Kleen <ak@...e.de>
Subject: Re: [patch 003/152] jbd: fix commit of ordered data buffers


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

> gad, there have been so many all-CPU-backtrace patches over the years.
> 
> <optimistically cc's Ingo>
> 
> Ingo, do you think that's something which we shuld have in the 
> spinlock debugging code?  A trace to let us see which CPU is holding 
> that lock, and where from?  I guess if the other cpu is stuck in 
> spin_lock_irqsave() then we'll get stuck delivering the IPI, so it'd 
> need to be async.

used to have this in -rt for i686 and x86_64 for the NMI watchdog tick 
to print on all CPUs, in the next tick (i.e. no need to actually 
initiate an IPI) - but it was all a bit hacky [but worked]. It fell 
victim to some recent flux in that area.

< optimistically cc's Andi =B-) >

	Ingo
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