linux-kernel - Re: [PATCH v7 1/5] tracing/probes: support '%pd' type for print struct dentry's name

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Message-ID: <20240321114836.2d448dd1@gandalf.local.home>
Date: Thu, 21 Mar 2024 11:48:36 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Ye Bin <yebin10@...wei.com>, <mathieu.desnoyers@...icios.com>,
 <linux-trace-kernel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/5] tracing/probes: support '%pd' type for print
 struct dentry's name

On Fri, 22 Mar 2024 00:28:05 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> On Fri, 22 Mar 2024 00:07:59 +0900
> Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:
> 
> > > What would be really useful is if we had a way to expose BTF here. Something like:
> > > 
> > >  "%pB:<struct>:<field>"
> > > 
> > > The "%pB" would mean to look up the struct/field offsets and types via BTF,
> > > and create the appropriate command to find and print it.  
> > 
> > Would you mean casing the pointer to "<struct>"?  
> 
> BTW, for this BTF type casting, I would like to make it more naturally, like
> (<struct> *)$arg1-><field> as same as other BTF args.
> 

Sure. I'm just interested in the functionality. I'll let others come up
with the syntax. ;-)

-- Steve