linux-kernel - Re: [PATCH v3 RESEND] function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously

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Message-ID: <20251112222113.74fbff01@batman.local.home>
Date: Wed, 12 Nov 2025 22:21:13 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Donglin Peng <dolinux.peng@...il.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org, Donglin
 Peng <pengdonglin@...omi.com>, Sven Schnelle <svens@...ux.ibm.com>
Subject: Re: [PATCH v3 RESEND] function_graph: Enable funcgraph-args and
 funcgraph-retaddr to work simultaneously

On Thu, 13 Nov 2025 11:01:15 +0800
Donglin Peng <dolinux.peng@...il.com> wrote:

> > Thanks, I agree and it indeed introduces extra branch instruction and
> > may introduce more overhead when using indirection lookups.  
> 
> Is it necessary to do the same thing for funcgraph-retaddr considering
> that it checks the global tracer_flags in the graph_entry?

Not yet. There's still other flags checked. There's other methods to
help with this (at least for some flags). Let's wait on it for now.

Thanks,

-- Steve