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From: Johnny young <johnny96.young@gmail.com>
To: bpf@vger.kernel.org
Subject: Is BTF info sufficient enough for BPFTrace and other debug tools to run ?
Date: Wed, 28 Sep 2022 12:17:38 -0700	[thread overview]
Message-ID: <CACbfJv8tn5dZmz=6+SMC4HZV05s-vnV2Nq19pC0D=eTLUu91Pg@mail.gmail.com> (raw)

Hello BPF

I understand that CONFIG_DEBUG_INFO_BTF=y will generate .BTF and
.BTF_xx  sections in the kernel image which are much smaller than
those DWARF sections.  But I also try to understand how BTF can impact
bpftrace and the existing debug tools:

1) If the kernel is built with CONFIG_DEBUG_INFO_BTF=y, can
bpftrace relies on BTF only without kernel_devel ?

2) Can the existing kernel debugging tools like crash(1) or
kgdb(1) take advantage of BTF ?

3) If the kernel is built with CONFIG_DEBUG_INFO_BTF=y, are the
symbolic info and types info in the debug-info section replaced with
BTF formatted info?

4) Given the current upstream development effort for BTF, can we run
bpftrace without LLVM now ? and can we run bpftrace without the help
of kernel header files (kernel-devel) ?

5) Has bpf CO-RE become reality now?

Thank you!
Johnny

             reply	other threads:[~2022-09-28 19:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-28 19:17 Johnny young [this message]
2022-09-29 21:35 ` Is BTF info sufficient enough for BPFTrace and other debug tools to run ? Stephen Brennan
2022-09-30 21:48   ` Johnny young

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