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From: Thomas Gleixner <tglx@linutronix.de>
To: Jeffrey Merkey <jeffmerkey@gmail.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	dzickus@redhat.com, uobergfe@redhat.com, atomlin@redhat.com,
	mhocko@suse.cz, fweisbec@gmail.com, tj@kernel.org,
	hidehiro.kawai.ez@hitachi.com, cmetcalf@ezchip.com
Subject: Re: [PATCH 01/31] Add hard/soft lockup debugger entry points
Date: Thu, 28 Jan 2016 20:56:52 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.11.1601282052480.3886@nanos> (raw)
In-Reply-To: <1454010366-28416-1-git-send-email-jeffmerkey@gmail.com>

On Thu, 28 Jan 2016, Jeffrey Merkey wrote:

> This patch series adds an export which can be set by system debuggers to
> direct the hard lockup and soft lockup detector to trigger a breakpoint
> exception and enter a debugger if one is active.  It is assumed that if
> someone sets this variable, then an breakpoint handler of some sort will
> be actively loaded or registered via the notify die handler chain.
> 
> This addition is extremely useful for debugging hard and soft lockups
> real time and quickly from a console debugger.

Why do we need an extra breakpoint instruction in the code to enter a
debugger? Don't have debuggers mechanisms to install breakpoints?

I'm probably missing something obvious here.

Thanks,

	tglx

  reply	other threads:[~2016-01-28 19:58 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-28 19:46 Jeffrey Merkey
2016-01-28 19:56 ` Thomas Gleixner [this message]
2016-01-28 20:08   ` Jeffrey Merkey
2016-01-28 20:48     ` Thomas Gleixner
2016-01-28 20:58       ` Jeffrey Merkey
2016-01-28 22:06         ` Thomas Gleixner
2016-01-28 22:22           ` Jeffrey Merkey
2016-01-29  8:16         ` Ingo Molnar
2016-01-29 16:26           ` Jeffrey Merkey
2016-01-29 16:34           ` Jeffrey Merkey
2016-01-29 17:19             ` Jeffrey Merkey
2016-01-30  2:43           ` Jeffrey Merkey
2016-01-28 20:35 ` kbuild test robot
2016-01-28 20:41 ` Chris Metcalf
2016-01-28 20:48   ` Jeffrey Merkey

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