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Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Frederic Weisbecker <fweisbec at gmail dot com>
- Cc: Steven Rostedt <rostedt at goodmis dot org>, Ingo Molnar <mingo at elte dot hu>, lkml <linux-kernel at vger dot kernel dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>, Thomas Gleixner <tglx at linutronix dot de>, Arnaldo Carvalho de Melo <acme at redhat dot com>, Mike Galbraith <efault at gmx dot de>, Paul Mackerras <paulus at samba dot org>, Peter Zijlstra <a dot p dot zijlstra at chello dot nl>, Christoph Hellwig <hch at infradead dot org>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Jim Keniston <jkenisto at us dot ibm dot com>, "Frank Ch. Eigler" <fche at redhat dot com>
- Date: Mon, 05 Oct 2009 17:05:32 -0400
- Subject: Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax
- References: <20091002214834.30906.86502.stgit@dhcp-100-2-132.bos.redhat.com> <20091002214842.30906.49220.stgit@dhcp-100-2-132.bos.redhat.com> <20091003015444.GE4828@nowhere> <4AC830F0.2010003@redhat.com> <4ACA25D5.10703@redhat.com> <20091005192609.GB6071@nowhere>
Frederic Weisbecker wrote:
- @global-symbol
We could use global-symbol as is. Shadowing between global
and local vars could be dealt with scope resolution:
function:var
file:var
file:line:var
And throw errors while submitting a shadowed var name, crying until
the user defines the scope, only if needed of course (if there are
no shadowing detected, we can submit a naked variable name).
Sure, via perf-probe, global/local symbols will be translated into
@address by debuginfo.
But without debuginfo, we still need @symbol syntax for accessing
global defined symbols.
- +|-Offs(ARG)
You mean for arg numbers?
So we would have +1 for argument 1?
Sorry for confusing you, it is for deref syntax.
arg(1) looks more easy to remember and to understand, no?
I think arg(N) seems a bit different from other parts.
Perhaps, %argumentN is possible ? :-)
Thank you,
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com