Re: [PATCH v5 2/2] Output stall data in debugfs

[Don Zickus]

On Tue, Aug 09, 2011 at 05:22:43PM -0700, Alex Neronskiy wrote:
> From: Alex Neronskiy <zakmagnus@xxxxxxxxxxxx>
> 
> 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.

This looks like it can work.  I'll try to play with it today.  Can I ask
that you add some comments to document the way the buffers work, so others
know what is going on to.

Cheers,
Don
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