linux-kernel - Re: [PATCH v2] ftrace: Fix stack trace entry generated by ftrace_pid

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Date: Mon, 27 May 2024 19:49:14 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Tatsuya S <tatsuya.s2862@...il.com>
Cc: mhiramat@...nel.org, mark.rutland@....com,
 mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ftrace: Fix stack trace entry generated by
 ftrace_pid_func()

On Mon, 27 May 2024 18:44:56 +0900
Tatsuya S <tatsuya.s2862@...il.com> wrote:

> On setting set_ftrace_pid, a extra entry generated by ftrace_pid_func()
> is shown on stack trace(CONFIG_UNWINDER_FRAME_POINTER=y).
> 
>         [004] .....    68.459382: <stack trace>
>  => 0xffffffffa00090af
>  => ksys_read
>  => __x64_sys_read
>  => x64_sys_call
>  => do_syscall_64
>  => entry_SYSCALL_64_after_hwframe  
> 
> To resolve this issue, increment skip count
> in function_stack_trace_call() if pids are set.

Just a note, this isn't a "fix" but simply an improvement in output.
I'm happy to take this (after testing and more reviewing), but it will
be for the next merge window, and with a different subject line.

  "ftrace: Hide one more entry in stack trace when ftrace_pid is enabled"

Or something like that.

Thanks,

-- Steve