From: Andi Kleen <andi@firstfloor.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>,
LKML <linux-kernel@vger.kernel.org>,
perf group <linux-perf-users@vger.kernel.org>
Subject: Re: Announcing simple-pt -- a simple Processor Trace implementation for Linux
Date: Mon, 17 Aug 2015 20:21:04 +0200 [thread overview]
Message-ID: <20150817182104.GJ1747@two.firstfloor.org> (raw)
In-Reply-To: <CAFTL4hwfk4ezi=MVpvURmW=hKdXX6mJQYabwisHejd77CW3Sjg@mail.gmail.com>
> > % sptdecode --sideband ptout.sideband --pt ptout.0 | less
> > TIME DELTA INSNs OPERATION
> > frequency 32
> > 0 [+0] [+ 1] _dl_aux_init+436
> > [+ 6] __libc_start_main+455 -> _dl_discover_osversion
> > ...
> > [+ 13] __libc_start_main+446 -> main
> > [+ 9] main+22 -> f1
> > [+ 4] f1+9 -> f2
> > [+ 2] f1+19 -> f2
> > [+ 5] main+22 -> f1
> > [+ 4] f1+9 -> f2
> > [+ 2] f1+19 -> f2
> > [+ 5] main+22 -> f1
>
> Nice. So I guess +x is the address offset. How hard would it be to
> translate to file lines?
Yes it's the address offset. Translating to lines wouldn't be too hard,
just needs to be implemented with a dwarf reader.
BTW the PT trace has all branches, just not the calls, but it's more
difficult to display them all in a nice way.
-Andi
prev parent reply other threads:[~2015-08-17 18:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-17 4:31 Announcing simple-pt -- a simple Processor Trace implementation for Linux Andi Kleen
2015-08-17 13:09 ` Frederic Weisbecker
2015-08-17 18:21 ` Andi Kleen [this message]
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