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From: "S. P. Prasanna" <prasanna@in.ibm.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Roland McGrath <roland@redhat.com>,
	Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Kwatch: kernel watchpoints using CPU debug registers
Date: Thu, 22 Feb 2007 17:13:26 +0530	[thread overview]
Message-ID: <20070222114326.GA14910@in.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0702211458250.3435-100000@iolanthe.rowland.org>

On Wed, Feb 21, 2007 at 03:35:13PM -0500, Alan Stern wrote:
> Going back to something you mentioned earlier...
> 
[...]
> On Fri, 9 Feb 2007, Roland McGrath wrote:
> There are two things I am uncertain about: vm86 mode and kprobes.  I don't
> know anything about how either of them works.  Judging from the current
> code, nothing much should be needed -- debug traps in vm86 mode are
> handled by calling handle_vm86_trap(), and kprobes puts itself at the
> start of the notify_die() chain so it can handle single-step traps.  
> Eventually it will be necessary to check with someone who really 
> understands the issues.

Yes, Kprobes needs to get notified first to handle single-step traps. So kwatch
getting notified secound should be fine.

Thanks
Prasanna
-- 
Prasanna S.P.
Linux Technology Center
India Software Labs, IBM Bangalore
Email: prasanna@in.ibm.com
Ph: 91-80-41776329

  reply	other threads:[~2007-02-22 11:42 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20070207025008.1B11118005D@magilla.sf.frob.com>
2007-02-07 19:22 ` Alan Stern
2007-02-07 22:08   ` Bob Copeland
2007-02-09 10:21   ` Roland McGrath
2007-02-09 15:54     ` Alan Stern
2007-02-09 23:31       ` Roland McGrath
2007-02-10  4:32         ` Alan Stern
2007-02-18  3:03           ` Roland McGrath
2007-02-21 20:35         ` Alan Stern
2007-02-22 11:43           ` S. P. Prasanna [this message]
2007-02-23  2:19           ` Roland McGrath
2007-02-23 16:55             ` Alan Stern
2007-02-24  0:08               ` Roland McGrath
2007-03-02 17:19                 ` [RFC] hwbkpt: Hardware breakpoints (was Kwatch) Alan Stern
2007-03-05  7:01                   ` Roland McGrath
2007-03-05 13:36                     ` Christoph Hellwig
2007-03-05 16:16                       ` Alan Stern
2007-03-05 16:49                         ` Christoph Hellwig
2007-03-05 22:04                         ` Roland McGrath
2007-03-05 17:25                     ` Alan Stern
2007-03-06  3:13                       ` Roland McGrath
2007-03-06 15:23                         ` Alan Stern
2007-03-07  3:49                           ` Roland McGrath
2007-03-07 19:11                             ` Alan Stern
2007-03-09  6:52                               ` Roland McGrath
2007-03-09 18:40                                 ` Alan Stern
2007-03-13  8:00                                   ` Roland McGrath
2007-03-13 13:07                                     ` Alan Cox
2007-03-13 18:56                                     ` Alan Stern
2007-03-14  3:00                                       ` Roland McGrath
2007-03-14 19:11                                         ` Alan Stern
2007-03-28 21:39                                           ` Roland McGrath
2007-03-29 21:35                                             ` Alan Stern
2007-04-13 21:09                                             ` Alan Stern
2007-05-11 15:25                                             ` Alan Stern
2007-05-13 10:39                                               ` Roland McGrath
2007-05-14 15:42                                                 ` Alan Stern
2007-05-14 21:25                                                   ` Roland McGrath
2007-05-16 19:03                                                     ` Alan Stern
2007-05-23  8:47                                                       ` Roland McGrath
2007-06-01 19:39                                                         ` Alan Stern
2007-06-14  6:48                                                           ` Roland McGrath
2007-06-19 20:35                                                             ` Alan Stern
2007-06-25 10:52                                                               ` Roland McGrath
2007-06-25 15:36                                                                 ` Alan Stern
2007-06-26 20:49                                                                   ` Roland McGrath
2007-06-27  3:26                                                                     ` Alan Stern
2007-06-27 21:04                                                                       ` Roland McGrath
2007-06-29  3:00                                                                         ` Alan Stern
2007-07-11  6:59                                                                           ` Roland McGrath
2007-06-28  3:02                                                                       ` Roland McGrath
2007-06-25 11:32                                                               ` Roland McGrath
2007-06-25 15:37                                                                 ` Alan Stern
2007-06-25 20:51                                                                 ` Alan Stern
2007-06-26 18:17                                                                   ` Roland McGrath
2007-06-27  2:43                                                                     ` Alan Stern
2007-05-17 20:39                                                 ` Alan Stern
2007-03-16 21:07                                         ` Alan Stern
2007-03-22 19:44                                         ` Alan Stern
     [not found] <20070206042153.66AB418005D@magilla.sf.frob.com>
2007-02-06 19:58 ` [PATCH] Kwatch: kernel watchpoints using CPU debug registers Alan Stern
2007-02-07  2:56   ` Roland McGrath
2007-01-16 16:55 Alan Stern
2007-01-16 23:35 ` Christoph Hellwig
2007-01-17 16:33   ` Alan Stern
2007-01-17  9:44 ` Ingo Molnar
2007-01-17 16:17   ` Alan Stern
2007-01-18  0:12     ` Christoph Hellwig
2007-01-18  7:31       ` Ingo Molnar
2007-01-18 15:37         ` Alan Stern
2007-01-18 22:33         ` Christoph Hellwig
2007-02-06  4:25     ` Roland McGrath

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