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Message-ID: <Yod7Kt4WHUCQF6ZL@slm.duckdns.org>
Date: Fri, 20 May 2022 01:27:38 -1000
From: Tejun Heo <tj@...nel.org>
To: Yosry Ahmed <yosryahmed@...gle.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Shuah Khan <shuah@...nel.org>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Michal Hocko <mhocko@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
David Rientjes <rientjes@...gle.com>,
Greg Thelen <gthelen@...gle.com>,
Shakeel Butt <shakeelb@...gle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH bpf-next v1 3/5] bpf: Introduce cgroup iter
On Thu, May 19, 2022 at 10:11:26PM -1000, Tejun Heo wrote:
> If you *must* do the iterator, can you at least make it a proper iterator
> which supports seeking? AFAICS there's nothing fundamentally preventing bpf
> iterators from supporting seeking. Or is it that you need something which is
> pinned to a cgroup so that you can emulate the directory structure?
Or, alternatively, would it be possible to make a TEST_RUN_PROG to output a
text file in bpffs? There just doesn't seem to be anything cgroup specific
that the iterator is doing that can't be done with exposing a couple kfuncs.
Thanks.
--
tejun
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