linux-kernel - Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion

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Message-ID: <20141114115039.GB13976@krava.redhat.com>
Date:	Fri, 14 Nov 2014 12:50:39 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Alexandre Montplaisir <alexmonthy@...populi.im>,
	linux-kernel@...r.kernel.org,
	Dominique Toupin <dominique.toupin@...csson.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Matthew Khouzam <matthew.khouzam@...csson.com>
Subject: Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion

adding Matthew Khouzam to the loop

jirka

On Thu, Nov 13, 2014 at 08:24:48PM +0100, Sebastian Andrzej Siewior wrote:
> I try to get through my ctf mailbox and I hoped I can finish it today
> but I don't make it completely…
> 
> On 11/06/2014 04:25 AM, Alexandre Montplaisir wrote:
> > "mvn clean install". It is the Maven equivalent of "./configure && make" ;)
> > 
> > Or if you want to build a standalone application (RCP):
> > mvn clean install -Pbuild-rcp -Dmaven.test.skip=true
> 
> thanks.
> 
> > Yes, the state dump is something specific to LTTng. It allows us to know
> > about processes that exist on the system, even if they are sleeping for
> > the whole duration of the trace (and thus, would not show up in the
> > trace at all).
> > 
> > But even if these events are not present, we can still know about active
> > processes when they do shed_switch's for example.
> 
> good to know.
> 
> > IIRC, compat_sys is for instance for 32-bit system calls on a 64-bit
> > kernel. Perhaps the "compat" system calls are recorded as standard
> > system call events with perf? We could test it once we get the base
> > things working.
> 
> I booted a x86-64 in a 32bit userland and I expected to see them
> somewhere but nothing. However if the task has a compat flag then it
> would be the same information, right?
> 
> >> - static final String SYS_CLONE = "sys_clone";
> >>    here we have
> >>      syscalls:sys_enter_clone
> >>      syscalls:sys_exit_clone
> >>    I guess the enter is what you are looking for.
> >>
> >> For the fields, this is one event with alle the members we have. Please
> >> note that lttng saves the members with the _ prefix and I haven't seen
> >> that prefix in that .java file.
> > 
> > As Mathieu explained in his reply, in LTTng-CTF they have a _ before
> > field names. In our parser, we take out the first character if it is an
> > underscore. So it should still work with underscore-less fields.
> 
> I see. I think it started working once I added the underline prefix but
> I might be wrong. Let me see what Mathieu says if I may leave that
> prefix out.
> 
> > Cheers,
> > Alexandre
> Sebastian
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