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From: Quentin Monnet <quentin@isovalent.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
	Jianlin Lv <Jianlin.Lv@arm.com>,
	bpf@vger.kernel.org
Cc: corbet@lwn.net, ast@kernel.org, andrii@kernel.org, kafai@fb.com,
	songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com,
	kpsingh@kernel.org, davem@davemloft.net, kuba@kernel.org,
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	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
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	sparclinux@vger.kernel.org, iecedge@gmail.com
Subject: Re: [PATCH bpf-next 1/2] bpf: Remove bpf_jit_enable=2 debugging mode
Date: Thu, 15 Apr 2021 16:41:23 +0100
Message-ID: <d3949501-8f7d-57c4-b3fe-bcc3b24c09d8@isovalent.com> (raw)
In-Reply-To: <9c4a78d2-f73c-832a-e6e2-4b4daa729e07@iogearbox.net>

2021-04-15 16:37 UTC+0200 ~ Daniel Borkmann <daniel@iogearbox.net>
> On 4/15/21 11:32 AM, Jianlin Lv wrote:
>> For debugging JITs, dumping the JITed image to kernel log is discouraged,
>> "bpftool prog dump jited" is much better way to examine JITed dumps.
>> This patch get rid of the code related to bpf_jit_enable=2 mode and
>> update the proc handler of bpf_jit_enable, also added auxiliary
>> information to explain how to use bpf_jit_disasm tool after this change.
>>
>> Signed-off-by: Jianlin Lv <Jianlin.Lv@arm.com>

Hello,

For what it's worth, I have already seen people dump the JIT image in
kernel logs in Qemu VMs running with just a busybox, not for kernel
development, but in a context where buiding/using bpftool was not
possible. Maybe not a common case, but still, removing the debugging
mode will make that impossible. Is there a particular incentive to
remove the feature?

Best regards,
Quentin

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Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15  9:32 Jianlin Lv
2021-04-15  9:32 ` [PATCH bpf-next 2/2] docs: bpf: bpf_jit_enable mode changed Jianlin Lv
2021-04-15 14:37 ` [PATCH bpf-next 1/2] bpf: Remove bpf_jit_enable=2 debugging mode Daniel Borkmann
2021-04-15 15:41   ` Quentin Monnet [this message]
2021-04-15 23:49     ` Alexei Starovoitov
2021-04-17  8:16       ` Christophe Leroy
2021-04-20  3:28         ` Alexei Starovoitov
2021-04-21 13:10           ` Christophe Leroy
2021-04-21 15:27             ` Quentin Monnet
2021-04-21 16:29             ` John Fastabend
2021-04-23  7:19           ` Christophe Leroy
2021-04-23 10:26             ` Quentin Monnet
2021-04-23 10:46               ` Christophe Leroy
2021-04-23 10:59                 ` Quentin Monnet
2021-04-23 11:29                   ` Christophe Leroy
2021-05-14  6:34               ` Christophe Leroy
2021-04-16 13:38   ` Jianlin Lv

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