From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>, Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org,
"Frank Ch. Eigler" <fche@redhat.com>,
Roland McGrath <roland@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [git pull] kgdb-light -v10
Date: Tue, 12 Feb 2008 19:20:24 +0100 [thread overview]
Message-ID: <20080212182024.GA4940@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.1.00.0802120829410.2920@woody.linux-foundation.org>
> - the kgdb commands should always act on the *current* CPU only
> - add one command that says "switch over to CPU #n" which just releases
> the current CPU and sends an IPI to that CPU #n (no timeouts, no
> synchronous waiting, no nothing - it's like a "continue", but with a
> "try to get the other CPU to stop"
The problem I see here is that the kernel tends to get badly confused
if one CPU just stops responding. At some point someone does an global
IPI and that then hangs. You would need to hotunplug the CPU which
is theoretically possible, but quite intrusive. Or maybe the "isolate CPUs
in cpusets" frame work someone posted recently on l-k could be used. Still
would probably have all kinds of tricky issues and races.
-Andi
next prev parent reply other threads:[~2008-02-12 17:45 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-11 1:53 kgdb in git-x86#mm review Andi Kleen
2008-02-11 15:32 ` Frank Ch. Eigler
2008-02-11 16:11 ` Andi Kleen
2008-02-11 16:21 ` [git pull] kgdb-light -v8, (was: Re: kgdb in git-x86#mm review) Ingo Molnar
2008-02-11 16:41 ` [git pull] kgdb-light -v8, Jan Kiszka
2008-02-11 16:54 ` Ingo Molnar
2008-02-11 17:10 ` [git pull] kgdb-light -v8, (was: Re: kgdb in git-x86#mm review) Andi Kleen
2008-02-11 23:03 ` [git pull] kgdb-light -v9 Ingo Molnar
2008-02-12 10:03 ` Andi Kleen
2008-02-12 9:35 ` Sam Ravnborg
2008-02-12 10:26 ` Roland McGrath
2008-02-12 10:34 ` Ingo Molnar
2008-02-12 11:27 ` [git pull] kgdb-light -v10 Ingo Molnar
2008-02-12 12:19 ` Andi Kleen
2008-02-12 12:38 ` Ingo Molnar
2008-02-12 13:30 ` Jason Wessel
2008-02-12 14:39 ` Andi Kleen
2008-02-12 14:35 ` Jason Wessel
2008-02-12 15:36 ` Andi Kleen
2008-02-12 16:21 ` Jason Wessel
2008-02-12 17:10 ` Andi Kleen
2008-02-12 16:48 ` Jason Wessel
2008-02-12 13:50 ` Andi Kleen
2008-02-12 15:16 ` Ingo Molnar
2008-02-12 15:28 ` Andi Kleen
2008-02-12 15:28 ` Ingo Molnar
2008-02-12 16:11 ` Andi Kleen
2008-02-12 16:24 ` Ingo Molnar
2008-02-12 17:01 ` Andi Kleen
2008-02-12 16:25 ` Linus Torvalds
2008-02-12 16:42 ` Ingo Molnar
2008-02-12 17:07 ` Andi Kleen
2008-02-15 12:35 ` [RFC][PATCH] modular kgdb-light (was: Re: [git pull] kgdb-light -v10) Jan Kiszka
2008-02-15 13:32 ` Andi Kleen
2008-02-15 20:24 ` [RFC][PATCH] modular kgdb-light Jason Wessel
2008-02-15 20:36 ` [git pull] kgdb-light -v10 Jason Wessel
2008-02-12 16:46 ` Linus Torvalds
2008-02-12 17:01 ` Ingo Molnar
2008-02-12 17:10 ` Ingo Molnar
2008-02-12 18:20 ` Andi Kleen [this message]
2008-02-12 18:11 ` Linus Torvalds
2008-02-12 19:22 ` Andi Kleen
2008-02-12 19:01 ` Linus Torvalds
2008-02-12 18:20 ` Andrew Morton
2008-02-12 19:16 ` Andi Kleen
2008-02-12 21:01 ` Ingo Molnar
2008-02-12 19:34 ` Frank Ch. Eigler
2008-02-12 20:16 ` Andi Kleen
2008-02-12 13:18 ` Domenico Andreoli
2008-02-12 13:59 ` Jason Wessel
2008-02-12 15:45 ` Domenico Andreoli
2008-02-11 16:03 ` kgdb in git-x86#mm review Mark Lord
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