linux-kernel - Re: [PATCH 2/8] tracing: do not trace kernel_text

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Date: Thu, 13 Jun 2024 09:32:33 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Andy Chiu <andy.chiu@...ive.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti
 <alexghiti@...osinc.com>, Zong Li <zong.li@...ive.com>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, Nathan
 Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Puranjay Mohan <puranjay@...nel.org>, Palmer Dabbelt <palmer@...osinc.com>,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 2/8] tracing: do not trace kernel_text_address()

On Thu, 13 Jun 2024 15:11:07 +0800
Andy Chiu <andy.chiu@...ive.com> wrote:

> kernel_text_address() and __kernel_text_address() are called in
> arch_stack_walk() of riscv. This results in excess amount of un-related
> traces when the kernel is compiled with CONFIG_TRACE_IRQFLAGS. The
> situation worsens when function_graph is active, as it calls
> local_irq_save/restore in each function's entry/exit. This patch adds
> both functions to notrace, so they won't show up on the trace records.

I rather not add notrace just because something is noisy.

You can always just add:

 echo '*kernel_text_address' > /sys/kernel/tracing/set_ftrace_notrace

and achieve the same result.

-- Steve