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From: Joe Perches <joe@perches.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>,
	Petr Mladek <pmladek@suse.com>,
	linux-kernel@vger.kernel.org, rafael@kernel.org,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	linux-acpi@vger.kernel.org, devicetree@vger.kernel.org,
	Rob Herring <robh@kernel.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Tzvetomir Stoyanov <tstoyanov@vmware.com>,
	linux-trace-devel@vger.kernel.org, Jiri Olsa <jolsa@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH v6 01/12] tools lib traceevent: Convert remaining %p[fF] users to %p[sS]
Date: Tue, 10 Sep 2019 12:44:03 -0700
Message-ID: <c90c33b421c0fa0db5182d0f58c6ba6e86cf1622.camel@perches.com> (raw)
In-Reply-To: <20190910150303.5a0d3904@oasis.local.home>

On Tue, 2019-09-10 at 15:03 -0400, Steven Rostedt wrote:
> On Tue, 10 Sep 2019 11:42:06 -0700
[]
> > btw:
> > 
> > Is there kernel version information available in
> > trace output files?
> 
> Not really. This is just a library that parses the trace event formats,
> there's not kernel versions passed in, but we do use variations in
> formats and such to determine what is supported.
> 
> > If so, it might be reasonable to change the tooling
> > there instead.
> > 
> 
> Actually, I think we could just look to see if "%pfw" is used and fall
> to that, otherwise consider it an older kernel and do it the original
> way.

Well, if you think that works, OK great.

But could that work?
How would an individual trace record know if
another trace record used %pfw?

Perhaps not reusing %pf, marking it reserved
for a period of years, and using another unused
prefix %p<type> like %pnfw may be simpler.



  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190910084707.18380-1-sakari.ailus@linux.intel.com>
2019-09-10  8:46 ` Sakari Ailus
2019-09-10  9:22   ` Andy Shevchenko
2019-09-10 11:18   ` Steven Rostedt
2019-09-10 17:18     ` Joe Perches
2019-09-10 18:26       ` Steven Rostedt
2019-09-10 18:42         ` Joe Perches
2019-09-10 19:03           ` Steven Rostedt
2019-09-10 19:44             ` Joe Perches [this message]
2019-09-16 11:41               ` Sakari Ailus
2019-09-16 14:37                 ` Steven Rostedt
2019-09-18 13:08                   ` Sakari Ailus

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