linux-kernel - Re: [PATCH -tip v2 7/8] perf probe: Remove die() from probe-finder code

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Date:	Sat, 10 Apr 2010 15:10:16 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH -tip v2 7/8] perf probe: Remove die() from probe-finder
 code

Em Sat, Apr 10, 2010 at 12:48:10PM -0400, Masami Hiramatsu escreveu:
> Arnaldo Carvalho de Melo wrote:
> > Em Sat, Apr 10, 2010 at 12:20:22AM -0400, Masami Hiramatsu escreveu:
> >> Arnaldo Carvalho de Melo wrote:
> >>> Em Fri, Apr 09, 2010 at 07:18:38PM -0400, Masami Hiramatsu escreveu:
> >>>>>  	tvar->value = xstrdup(regs);
> >>>>>  	if (ref) {
> >>>>>  		tvar->ref = xzalloc(sizeof(struct kprobe_trace_arg_ref));

> >>> We have to kill those xzcalloc, etc, too they are die() in disguise :-)

> >> Hmm, I think that will cost high, because only failing to allocate memory,
> >> which theoretically means we can't continue to operate it. In that case,
> >> we'd better just use backtrace() and die().

> > Consider a situation where we are trying to allocate lots of objects
> > allocated for some big operation (adding probes for all functions in all
> > threads, whatever), we can just say to the user "hey, you don't have
> > memory to do this" but other operations are possible, so calling
> > panic(), oops, die() is not the right thing to do.

> Hmm, OK, so we'd better remove wrapper.c...

Yeah, that came from git, we'll eventually get rid of it, its just that
I wanted to make clear the rationale behind avoiding spreading its use.

- Arnaldo
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