linux-kernel - Re: [PATCHv11 2.6.36-rc2-tip 5/15] 5: uprobes: Uprobes (un)registration and exception handling.

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Date:	Mon, 06 Sep 2010 23:18:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naren A Devaiah <naren.devaiah@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [PATCHv11 2.6.36-rc2-tip 5/15]  5: uprobes: Uprobes
 (un)registration and exception handling.

On Mon, 2010-09-06 at 17:12 -0400, Christoph Hellwig wrote:
> On Mon, Sep 06, 2010 at 11:06:08PM +0200, Peter Zijlstra wrote:
> > > The other things is that perf currently only supports per-kernel pid
> > > recording, while we'd really need per Posix process, which may contain
> > > multiple threads for useful tracing of complex userspace applications.
> > > I also suspect that this will fit the uprobes model much better given
> > > that the probes will be in any given address space.
> > 
> > perf does report both:
> > 
> >          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
> > 
> > the pid is the process id (thread group leader like) and tid is the
> > task/thread id.
> 
> It records both, but I haven't found a way to only record samples
> or trace things in a Posix Process.
> 
> E.g. perf record -p seems to be only per-thread, not per-process.
> If that has changes recently everything is fine of course.

Hrm, the record code seems to look up all threads for -p and use only a
single thread for -t, didn't actually try it though so it could be
borken.


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