From: Steven Rostedt <rostedt@goodmis.org>
To: Andy Chiu <andy.chiu@sifive.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alexghiti@rivosinc.com>,
Zong Li <zong.li@sifive.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Puranjay Mohan <puranjay@kernel.org>,
Palmer Dabbelt <palmer@rivosinc.com>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH 2/8] tracing: do not trace kernel_text_address()
Date: Thu, 13 Jun 2024 09:32:33 -0400 [thread overview]
Message-ID: <20240613093233.0b349ed0@rorschach.local.home> (raw)
In-Reply-To: <20240613-dev-andyc-dyn-ftrace-v4-v1-2-1a538e12c01e@sifive.com>
On Thu, 13 Jun 2024 15:11:07 +0800
Andy Chiu <andy.chiu@sifive.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
next prev parent reply other threads:[~2024-06-13 13:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-13 7:11 [PATCH 0/8] riscv: ftrace: atmoic patching and preempt improvements Andy Chiu
2024-06-13 7:11 ` [PATCH 1/8] riscv: stacktrace: convert arch_stack_walk() to noinstr Andy Chiu
2024-06-18 9:55 ` Alexandre Ghiti
2024-06-25 15:45 ` Palmer Dabbelt
2024-06-13 7:11 ` [PATCH 2/8] tracing: do not trace kernel_text_address() Andy Chiu
2024-06-13 13:32 ` Steven Rostedt [this message]
2024-06-17 2:10 ` Andy Chiu
2024-06-13 7:11 ` [PATCH 3/8] riscv: ftrace: support fastcc in Clang for WITH_ARGS Andy Chiu
2024-06-13 22:36 ` Nathan Chancellor
2024-06-13 7:11 ` [PATCH 4/8] riscv: ftrace: align patchable functions to 4 Byte boundary Andy Chiu
2024-06-13 19:09 ` Nathan Chancellor
2024-06-17 2:38 ` Andy Chiu
2024-06-17 3:13 ` Andy Chiu
2024-06-17 16:52 ` Nathan Chancellor
2024-06-13 7:11 ` [PATCH 5/8] riscv: ftrace: prepare ftrace for atomic code patching Andy Chiu
2024-06-13 7:11 ` [PATCH 6/8] riscv: ftrace: do not use stop_machine to update code Andy Chiu
2024-06-13 7:11 ` [PATCH 7/8] riscv: vector: Support calling schedule() for preemptible Vector Andy Chiu
2024-06-13 7:11 ` [PATCH 8/8] riscv: ftrace: support PREEMPT Andy Chiu
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