linux-kernel - Re: [PATCH 12/12] iomap: add tracing for the address space operations

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Date:   Tue, 25 Jun 2019 12:15:15 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dave Chinner <david@...morbit.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/12] iomap: add tracing for the address space
 operations

On Tue, Jun 25, 2019 at 09:49:21AM +1000, Dave Chinner wrote:
> > +#undef TRACE_SYSTEM
> > +#define TRACE_SYSTEM iomap
> 
> Can you add a comment somewhere here that says these tracepoints are
> volatile and we reserve the right to change them at any time so they
> don't form any sort of persistent UAPI that we have to maintain?

Sure.  Note that we don't have any such comment in xfs either..