linux-kernel - Re: [PATCH v7 2/2] Output stall data in debugfs

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Message-ID: <20110816151605.GL1972@redhat.com>
Date:	Tue, 16 Aug 2011 11:16:05 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Alex Neronskiy <zakmagnus@...omium.org>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	Ingo Molnar <mingo@...e.hu>,
	Mandeep Singh Baines <msb@...omium.org>
Subject: Re: [PATCH v7 2/2] Output stall data in debugfs

On Thu, Aug 11, 2011 at 04:35:08PM -0700, Alex Neronskiy wrote:
> Instead of using the log, use debugfs for output of both stall
> lengths and stack traces. Printing to the log can result in
> watchdog touches, distorting the very events being measured.
> Additionally, the information will not distract from lockups
> when users view the log.
> 
> A two-buffer system is used to ensure that the trace information
> can always be recorded without contention.
> 
> Signed-off-by: Alex Neronskiy <zakmagnus@...omium.org>
> ---
> Changes from last version per Peter's suggestions: different
> locks, refactoring, ACCESS_ONCE.

I think I am going to ignore these patches for now until I see if you can
solve things using Ingo's idea.

Cheers,
Don
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