From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: user-mode-linux-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: [uml-devel] [PATCH 06/10] uml: run mconsole "sysrq" in process context
Date: Thu, 22 Sep 2005 16:37:43 -0400 [thread overview]
Message-ID: <20050922203743.GA11648@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200509222120.20922.blaisorblade@yahoo.it>
On Thu, Sep 22, 2005 at 09:20:20PM +0200, Blaisorblade wrote:
> sysrq t is broken (and stays),
There's a fix on the way for that. This has nothing to do with interrupt
context anyway.
> but additionally there are some warnings from
> some commands (enable sleep inside spinlock checking and spinlock debugging),
> which go to the down_read inside handle_page_fault IIRC. So try to run in
> process context.
Which ones? They should be fixed.
It is fairly fundamental to sysrq that it work from interrupt context. You
may be diagnosing a system which can't context switch any more.
This patch should be dropped, and the real problems fixed.
Jeff
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WARNING: multiple messages have this Message-ID (diff)
From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: user-mode-linux-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: [uml-devel] [PATCH 06/10] uml: run mconsole "sysrq" in process context
Date: Thu, 22 Sep 2005 16:37:43 -0400 [thread overview]
Message-ID: <20050922203743.GA11648@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200509222120.20922.blaisorblade@yahoo.it>
On Thu, Sep 22, 2005 at 09:20:20PM +0200, Blaisorblade wrote:
> sysrq t is broken (and stays),
There's a fix on the way for that. This has nothing to do with interrupt
context anyway.
> but additionally there are some warnings from
> some commands (enable sleep inside spinlock checking and spinlock debugging),
> which go to the down_read inside handle_page_fault IIRC. So try to run in
> process context.
Which ones? They should be fixed.
It is fairly fundamental to sysrq that it work from interrupt context. You
may be diagnosing a system which can't context switch any more.
This patch should be dropped, and the real problems fixed.
Jeff
next prev parent reply other threads:[~2005-09-22 20:44 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-21 17:23 [uml-devel] [PATCH 0/10] "Bigger" UML fixes for 2.6.14 Blaisorblade
2005-09-21 17:23 ` Blaisorblade
2005-09-21 17:27 ` [uml-devel] [PATCH 01/10] uml: don't remove umid files in conflict case Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:27 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` [uml-devel] [PATCH 02/10] strlcat: use for uml umid.c Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` [uml-devel] [PATCH 03/10] uml: don't redundantly mark pte as newpage in pte_modify Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` [uml-devel] [PATCH 04/10] uml: fix hang in TT mode on fault Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` [uml-devel] [PATCH 05/10] uml: fix condition in tlb flush Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` [uml-devel] [PATCH 06/10] uml: run mconsole "sysrq" in process context Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:28 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 20:50 ` [uml-devel] " Jeff Dike
2005-09-21 20:50 ` Jeff Dike
2005-09-22 19:20 ` Blaisorblade
2005-09-22 19:20 ` Blaisorblade
2005-09-22 20:37 ` Jeff Dike [this message]
2005-09-22 20:37 ` Jeff Dike
2005-09-22 20:48 ` Blaisorblade
2005-09-22 20:48 ` Blaisorblade
2005-09-23 7:40 ` Andrew Morton
2005-09-23 7:40 ` Andrew Morton
2005-09-23 13:33 ` Jeff Dike
2005-09-23 13:33 ` Jeff Dike
2005-09-25 21:34 ` Paul Jackson
2005-09-25 21:34 ` Paul Jackson
2005-09-21 17:29 ` [uml-devel] [PATCH 07/10] uml: avoid fixing faults while atomic Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:29 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 19:49 ` [uml-devel] " Andrew Morton
2005-09-21 19:49 ` Andrew Morton
2005-09-21 20:22 ` [uml-devel] " Blaisorblade
2005-09-21 20:22 ` Blaisorblade
2005-09-21 20:47 ` Andrew Morton
2005-09-21 20:47 ` Andrew Morton
2005-09-22 19:37 ` Blaisorblade
2005-09-22 19:37 ` Blaisorblade
2005-09-22 19:58 ` Andrew Morton
2005-09-22 19:58 ` Andrew Morton
2005-09-22 20:54 ` Linus Torvalds
2005-09-22 20:54 ` Linus Torvalds
2005-09-21 20:29 ` Linus Torvalds
2005-09-21 20:29 ` Linus Torvalds
2005-09-21 17:29 ` [uml-devel] [PATCH 08/10] uml: Fix GFP_ flags usage Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:29 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 19:19 ` [uml-devel] " Bill Davidsen
2005-09-21 19:19 ` Bill Davidsen
2005-09-21 20:52 ` [uml-devel] " Jeff Dike
2005-09-21 20:52 ` Jeff Dike
2005-09-21 17:29 ` [uml-devel] [PATCH 09/10] Uml: use GFP_ATOMIC for allocations under spinlocks Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:29 ` Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:29 ` [uml-devel] [PATCH 10/10] uml: replace printk with "stack-friendly" printf - to report console failure Paolo 'Blaisorblade' Giarrusso
2005-09-21 17:29 ` Paolo 'Blaisorblade' Giarrusso
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