linux-kernel - Re: [PATCH] perf/probe: Provide perf interface for uprobes

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Message-ID: <20120416122737.GB25464@linux.vnet.ibm.com>
Date:	Mon, 16 Apr 2012 17:57:37 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Arapov <anton@...hat.com>
Subject: Re: [PATCH] perf/probe: Provide perf interface for uprobes

> 
> > > Another case 
> > > perf probe do_fork clone_flags now looks for variable clone_flags in
> > > kernel function do_fork.
> 
> > > But if we allow to trace perf probe zsh zfree; then 
> > > 'perf probe do_fork clone_flags' should it check for do_fork executable
> > > or not? If it does check and finds one, and searches for clone_flags
> > > function and doesnt find, then should it continue with searching the
> > > kernel?
> 
> > Agree. I'd like to suggest you to start with only full path support,
> > and see, how we can handle abbreviations :)
> 
> Agreed, I was just making usability suggestions.
> 
> Those can be implemented later, if we agree they ease the tool use.
> 

I have just made a prototype for guessing the target when -m and -x
options arent passed. That still uses the absolute path for now.

I was trying to see if we can identify the module by the short name by
using kernel_get_module_path(). However kernel_get_module_path() needs
init_vmlinux() to be called before. Since init_vmlinux() cant be called
more than once and init_vmlinux gets called later, I thought calling it
here wasnt good option. Wanted to see if we could open /proc/modules
and then match the module name.  But again, I wasnt sure how to handle
offline modules.  

-- 
Thanks and Regards
Srikar

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