From: Yixun Lan <dlan@gentoo.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Yonghong Song <yhs@fb.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Alan Maguire <alan.maguire@oracle.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
linux-riscv@lists.infradead.org,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
open list <linux-kernel@vger.kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH] RISC-V/bpf: Enable bpf_probe_read{, str}()
Date: Sat, 9 Jul 2022 16:48:05 +0800 [thread overview]
Message-ID: <YslAxaryvm/MfGbq@ofant> (raw)
In-Reply-To: <YskfMTdnd+IyzCQ0@infradead.org>
Hi Christoph:
On 23:24 Fri 08 Jul , Christoph Hellwig wrote:
> On Sat, Jul 09, 2022 at 09:01:10AM +0800, Yixun Lan wrote:
> > Please check the ongoing discussion [0] in the bcc tools if you're
> > interested in, advice and comments are welcome
> >
> > [0] https://github.com/iovisor/bcc/pull/4085#issuecomment-1179446738
>
> I can't find a way to post there, as replying eems to require a login.
> Is there a mailing list discussion somewhere that is broadly accessible?
never mind, I think the logic is quite clear, we can do something in bcc:
1) adopt new _{kernel,user} interface whenever possible, this will
work fine for all arch with new kernel versions
2) for old kernel versions which lack the _{kernel,user} support,
fall back to old bpf_probe_read(), but take care of the Archs which
have overlaping address space - like s390, and just error out for it
--
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55
next prev parent reply other threads:[~2022-07-09 8:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-03 13:09 [PATCH] RISC-V/bpf: Enable bpf_probe_read{, str}() Yixun Lan
2022-07-03 13:12 ` Conor Dooley
2022-07-04 2:20 ` Yixun Lan
2022-07-04 6:29 ` Conor.Dooley
2022-07-04 5:53 ` Christoph Hellwig
2022-07-06 5:00 ` Andrii Nakryiko
2022-07-06 6:41 ` Yonghong Song
2022-07-06 7:01 ` Christoph Hellwig
2022-07-09 1:01 ` Yixun Lan
2022-07-09 6:24 ` Christoph Hellwig
2022-07-09 8:48 ` Yixun Lan [this message]
2022-07-11 3:58 ` Christoph Hellwig
2022-07-06 7:00 ` Christoph Hellwig
2022-07-08 22:22 ` Andrii Nakryiko
2022-07-09 6:25 ` Christoph Hellwig
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