linux-kernel - Re: [PATCHv9 2.6.35-rc4-tip 0/13] Uprobes Patches:

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Message-ID: <20100721142251.GB17631@ghostprotocols.net>
Date:	Wed, 21 Jul 2010 11:22:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Naren A Devaiah <naren.devaiah@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCHv9 2.6.35-rc4-tip 0/13]  Uprobes Patches:

Em Wed, Jul 21, 2010 at 08:12:00AM +0530, Srikar Dronamraju escreveu:
> > Em Tue, Jul 20, 2010 at 12:08:05PM +0530, Srikar Dronamraju escreveu:
> > > > A minor note on perf probe -S output:  This seems to include a lot of
> > > > T.456 or similar labels, which from my recollection are gcc internal
> > > > things.  It would be good to filter those out as they aren't quite
> > > > useful and just fill up the list.

> > > Okay .. will take a look. Offhand I dont know about the T.456
> > > labels, so I will google and see if its possible for us to identify if
> > > its a t.456 label. However if you know how to identify a t456 label
> > > from normal functions, then it would be great.

> > We may have some hint on the symtab, having access to one of those files
> > to look at its symtab will help.
> 
> I tried searching for t.456 gcc labels in google. I dont think I found
> anything interesting. Are we looking at not listing symbols that end
> with @plt? Can you please list an example t.456 label. Also any pointers to
> where I can find more information on the same would be very useful.

I guess this is what he means:

[acme@...pio linux-2.6-tip]$ grep ' [TtWw] .\+\.' /proc/kallsyms | head -5
ffffffff81000646 t trace_kmalloc.clone.0
ffffffff810006ac t create_dev.clone.0
ffffffff81006ae4 t test_ti_thread_flag.clone.0
ffffffff8100a388 t trace_power_start.clone.0
ffffffff8100ad8d t user_regset_copyin.clone.0
[acme@...pio linux-2.6-tip]$ readelf -s ../build/v2.6.35-rc5-tip+/vmlinux | grep ' FUNC .\+\.' | head -5
   165: ffffffff81000646   101 FUNC    LOCAL  DEFAULT    1 trace_kmalloc.clone.0
   180: ffffffff810006ac    44 FUNC    LOCAL  DEFAULT    1 create_dev.clone.0
   438: ffffffff81006ae4    22 FUNC    LOCAL  DEFAULT    1 test_ti_thread_flag.clone
   510: ffffffff81ae5c40   136 FUNC    LOCAL  DEFAULT   22 e820_end_pfn.clone.0
   750: ffffffff8100a388    65 FUNC    LOCAL  DEFAULT    1 trace_power_start.clone.0
[acme@...pio linux-2.6-tip]$

Or at least those are the ones with dots here.

- Arnaldo
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