From: Florian Kauer <florian.kauer@linutronix.de>
To: Donglin Peng <pengdonglin@sangfor.com.cn>,
mhiramat@kernel.org, rostedt@goodmis.org, linux@armlinux.org.uk,
mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com,
palmer@dabbelt.com, paul.walmsley@sifive.com, tglx@linutronix.de,
dave.hansen@linux.intel.com, x86@kernel.org, mingo@redhat.com,
xiehuan09@gmail.com, dinghui@sangfor.com.cn,
huangcun@sangfor.com.cn, dolinux.peng@gmail.com
Cc: linux-trace-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/2] function_graph: Support recording and printing the return value of function
Date: Tue, 21 Mar 2023 15:09:40 +0100 [thread overview]
Message-ID: <2eeef5a3-cbe7-7a01-489a-87c5ac00adf7@linutronix.de> (raw)
In-Reply-To: <20230320131650.482594-2-pengdonglin@sangfor.com.cn>
On 20.03.23 14:16, Donglin Peng wrote:
> When using the function_graph tracer to analyze system call failures,
> it can be time-consuming to analyze the trace logs and locate the kernel
> function that first returns an error. This change aims to simplify the
> process by recording the function return value to the 'retval' member of
> 'ftrace_graph_ent' and printing it when outputing the trace log.
I just came across your patch by pure luck and it helped me a lot
to trace down a problem I had, thanks!
So you can have my
Tested-by: Florian Kauer <florian.kauer@linutronix.de>
> New trace options are introduced: funcgraph-retval and graph_retval_hex.
I would personally prefer to have the second option scoped better, so for example
"funcgraph-retval-hex".
Greetings,
Florian
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next prev parent reply other threads:[~2023-03-21 14:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 13:16 [PATCH v5 0/2] function_graph: Support recording and printing the return value of function Donglin Peng
2023-03-20 13:16 ` [PATCH v5 1/2] " Donglin Peng
2023-03-21 14:09 ` Florian Kauer [this message]
2023-03-21 14:44 ` Steven Rostedt
2023-03-21 15:11 ` Florian Kauer
2023-03-22 5:01 ` Donglin Peng
2023-03-21 14:24 ` Mark Rutland
2023-03-22 8:47 ` Donglin Peng
2023-03-21 17:31 ` Russell King (Oracle)
2023-03-22 9:01 ` Donglin Peng
2023-03-20 13:16 ` [PATCH v5 2/2] tracing: Add documentation for funcgraph-retval and graph_retval_hex Donglin Peng
2023-03-21 2:31 ` Ding Hui
2023-03-21 3:24 ` Donglin Peng
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