Re: tracepoints in ext4 (and/or ext3?)

KOSAKI Motohiro
2008-08-12T06:33:58Z

> On Mon, Aug 11, 2008 at 03:18:07PM -0500, Eric Sandeen wrote:
> > As just an initial inquiry, I'm wondering how people would feel about
> > putting some tracepoints (trace_mark()) into ext[34] for monitoring the
> > fs behavior.
>
> I think it's a great idea! Do you have some specific tracepoints in
> mind?

I think two viewpoint exist. An administrator want to
- performance mesurement
- which IO aborted it, if any error happend.

In addition, OS vendor want to
- split out fs problem and device problem

So, candidate of tracepints are
- jbd activity
- boundary activity between fs and block layer

I don't fs expert, it is just idea.