Re: [git pull] kgdb-light -v10

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From: Andi Kleen
Date: Tuesday, February 12, 2008 - 9:11 am

On Tue, Feb 12, 2008 at 04:28:46PM +0100, Ingo Molnar wrote:

Yes and the session has no fixed time limit.


Stopping with interrupts off. Nothing scheduled anymore. 

An easy definition for the condition is anything that requires 
touch_{nmi,softlockup}_watchdog [which kgdb definitely does, 
although in a quite convoluted way]


While that is a slight risk that problem is already there anyways.
Lots of agents in the system could do that. Do you plan to stop
all DMA too for example if you're so worried about this? 
Or how about SMM code changing something? 

Anyways the slight risk of the other CPUs eventually recovering
would seem a acceptable trade off versus not being able to use
the debugger to debug the system with hanging CPUs. 

A possible compromise between my and your position on this would 
be also having an option for this, with default to off
(although I would expect that would be a inconvenient default for
many people)

-Andi (who retires from this thread now, I already spent too much on this)

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Messages in current thread:
kgdb in git-x86#mm review, Andi Kleen, (Sun Feb 10, 6:53 pm)
Re: kgdb in git-x86#mm review, Frank Ch. Eigler, (Mon Feb 11, 8:32 am)
Re: kgdb in git-x86#mm review, Mark Lord, (Mon Feb 11, 9:03 am)
Re: kgdb in git-x86#mm review, Andi Kleen, (Mon Feb 11, 9:11 am)
Re: [git pull] kgdb-light -v8,, Jan Kiszka, (Mon Feb 11, 9:41 am)
Re: [git pull] kgdb-light -v8,, Ingo Molnar, (Mon Feb 11, 9:54 am)
[git pull] kgdb-light -v9, Ingo Molnar, (Mon Feb 11, 4:03 pm)
Re: [git pull] kgdb-light -v9, Sam Ravnborg, (Tue Feb 12, 2:35 am)
Re: [git pull] kgdb-light -v9, Andi Kleen, (Tue Feb 12, 3:03 am)
Re: [git pull] kgdb-light -v9, Roland McGrath, (Tue Feb 12, 3:26 am)
Re: [git pull] kgdb-light -v9, Ingo Molnar, (Tue Feb 12, 3:34 am)
[git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 4:27 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 5:19 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 5:38 am)
Re: [git pull] kgdb-light -v10, Domenico Andreoli, (Tue Feb 12, 6:18 am)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Tue Feb 12, 6:30 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 6:50 am)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Tue Feb 12, 6:59 am)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Tue Feb 12, 7:35 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 7:39 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 8:16 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 8:28 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 8:28 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 8:36 am)
Re: [git pull] kgdb-light -v10, Domenico Andreoli, (Tue Feb 12, 8:45 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 9:11 am)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Tue Feb 12, 9:21 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 9:24 am)
Re: [git pull] kgdb-light -v10, Linus Torvalds, (Tue Feb 12, 9:25 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 9:42 am)
Re: [git pull] kgdb-light -v10, Linus Torvalds, (Tue Feb 12, 9:46 am)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Tue Feb 12, 9:48 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 10:01 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 10:01 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 10:07 am)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 10:10 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 10:10 am)
Re: [git pull] kgdb-light -v10, Linus Torvalds, (Tue Feb 12, 11:11 am)
Re: [git pull] kgdb-light -v10, Andrew Morton, (Tue Feb 12, 11:20 am)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 11:20 am)
Re: [git pull] kgdb-light -v10, Linus Torvalds, (Tue Feb 12, 12:01 pm)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 12:16 pm)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 12:22 pm)
Re: [git pull] kgdb-light -v10, Frank Ch. Eigler, (Tue Feb 12, 12:34 pm)
Re: [git pull] kgdb-light -v10, Andi Kleen, (Tue Feb 12, 1:16 pm)
Re: [git pull] kgdb-light -v10, Ingo Molnar, (Tue Feb 12, 2:01 pm)
Re: [RFC][PATCH] modular kgdb-light, Jason Wessel, (Fri Feb 15, 1:24 pm)
Re: [git pull] kgdb-light -v10, Jason Wessel, (Fri Feb 15, 1:36 pm)