Re: [PATCH] workaround minor lockdep bug triggered by mm_take_all_locks

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Subject: Re: [PATCH] workaround minor lockdep bug triggered by mm_take_all_locks

Date: Monday, August 4, 2008 - 5:57 pm

From: Andrea Arcangeli <andrea@qumranet.com>
Date: Mon, 4 Aug 2008 23:09:54 +0200

quoted text> On Mon, Aug 04, 2008 at 10:37:22PM +0200, Peter Zijlstra wrote:
> > You're so wrong it not even funny. It reports about deadlocks before
> > they happen. All it needs is to observe a lock order violation and it
> 
> Now tell me how it helps to report them... It tells me the system has
> crashed and where, it's not like I couldn't figure it out by myself
> but just noticing nothing works and all cpus are spinning in some
> spinlock slow path and pressing sysrq+t/p.

It tells you about deadlock scenerios that you haven't even encoutered
yet.  It shows bugs for parallel code path sequences that have not
even occurred yet.

But I think you're beyond the point of being able to see why lockdep
is valuable.  So why don't we just move on.
--
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Messages in current thread:

[RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 9:03 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Thu Aug 7, 7:25 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 2:06 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 2:54 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 3:26 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Mon Aug 4, 3:31 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 11:27 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Nick Piggin, (Wed Oct 8, 11:52 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 1:18 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Wed Oct 8, 11:43 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 12:03 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Linus Torvalds, (Wed Oct 8, 12:19 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Steven Rostedt, (Wed Oct 8, 12:53 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Jeremy Fitzhardinge, (Mon Aug 4, 4:16 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 3:39 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Roland Dreier, (Mon Aug 4, 10:07 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:19 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Roland Dreier, (Mon Aug 4, 10:26 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:32 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Dave Jones, (Mon Aug 4, 10:53 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 10:56 am)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 12:26 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 12:38 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), David Miller, (Mon Aug 4, 5:32 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 1:27 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Peter Zijlstra, (Mon Aug 4, 2:48 pm)

Re: [RFC][PATCH 7/7] lockdep: spin_lock_nest_lock(), Andrea Arcangeli, (Mon Aug 4, 1:46 pm)

[PATCH] workaround minor lockdep bug triggered by mm_take_al..., Andrea Arcangeli, (Mon Aug 4, 1:57 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 2:48 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 4:15 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 4:37 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:09 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Mon Aug 4, 10:00 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 10:18 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Tue Aug 5, 8:02 am)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Tue Aug 5, 8:20 am)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., David Miller, (Mon Aug 4, 5:57 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 5:27 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:54 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Pekka Enberg, (Mon Aug 4, 5:14 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 5:30 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 5:42 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 6:30 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Arjan van de Ven, (Mon Aug 4, 7:38 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 8:47 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrew Morton, (Mon Aug 4, 5:41 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Andrea Arcangeli, (Mon Aug 4, 6:12 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Roland Dreier, (Mon Aug 4, 2:56 pm)

Re: [PATCH] workaround minor lockdep bug triggered by mm_tak..., Peter Zijlstra, (Mon Aug 4, 3:05 pm)

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