linux-kernel - Re: [PATCH] arm64: Add user stacktrace support

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Message-ID: <ZVubargzvLPmhSYd@FVFF77S0Q05N.cambridge.arm.com>
Date:   Mon, 20 Nov 2023 17:46:18 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     qiwuchen55@...il.com
Cc:     catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        chenqiwu <qiwu.chen@...nssion.com>
Subject: Re: [PATCH] arm64: Add user stacktrace support

On Mon, Nov 20, 2023 at 02:29:23PM +0000, Mark Rutland wrote:
> On Sat, Nov 18, 2023 at 09:45:04PM +0800, qiwuchen55@...il.com wrote:
> > From: chenqiwu <qiwu.chen@...nssion.com>

> > 2. Add arch_stack_walk_user() implementation to support userstacktrace transsionce option.
> 
> What is this 'userstacktrace transsionce option' ?

Sorry, I evidently corrupted the mail at my end; "transsionce" was "trace" in
the original mail, which matches the ftrace output below.

Please ignore this specific comment; my other concerns still apply.

> > A example test about the output format of ftrace userstacktrace as shown below:
> >     bash-489     [000] .....  2167.660775: sched_process_fork: comm=bash pid=489 child_comm=bash child_pid=596
> >     bash-489     [000] .....  2167.660787: <user stack trace>
> >  => /lib/aarch64-linux-gnu/libc-2.32.so[+0xa76d8]
> >  => /bin/bash[+0x5f354]
> >  => /bin/bash[+0x4876c]
> >  => /bin/bash[+0x4aec4]
> >  => /bin/bash[+0x4da48]
> >  => /bin/bash[+0x4b710]
> >  => /bin/bash[+0x4c31c]
> >  => /bin/bash[+0x339b0]

Thanks,
Mark.