From: Yosry Ahmed <yosryahmed@google.com>
To: "Michal Koutný" <mkoutny@suse.com>
Cc: 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>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
Tejun Heo <tj@kernel.org>, Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Shuah Khan <shuah@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Michal Hocko <mhocko@kernel.org>,
Stanislav Fomichev <sdf@google.com>,
David Rientjes <rientjes@google.com>,
Greg Thelen <gthelen@google.com>,
Shakeel Butt <shakeelb@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
Cgroups <cgroups@vger.kernel.org>
Subject: Re: [PATCH bpf-next v1 5/5] bpf: add a selftest for cgroup hierarchical stats collection
Date: Fri, 3 Jun 2022 12:52:27 -0700 [thread overview]
Message-ID: <CAJD7tkYwU5dW9Oof+pC81R9Bi-F=-EuiXpTn+HDeqbhTOTCcuw@mail.gmail.com> (raw)
In-Reply-To: <20220603162339.GA25043@blackbody.suse.cz>
Thanks for taking a look at this!
On Fri, Jun 3, 2022 at 9:23 AM Michal Koutný <mkoutny@suse.com> wrote:
>
> On Fri, May 20, 2022 at 01:21:33AM +0000, Yosry Ahmed <yosryahmed@google.com> wrote:
> > +#define CGROUP_PATH(p, n) {.name = #n, .path = #p"/"#n}
> > +
> > +static struct {
> > + const char *name, *path;
>
> Please unify the order of path and name with the macro (slightly
> confusing ;-).
Totally agree, will do.
>
> > +SEC("tp_btf/mm_vmscan_memcg_reclaim_end")
> > +int BPF_PROG(vmscan_end, struct lruvec *lruvec, struct scan_control *sc)
> > +{
> > [...]
> > + struct cgroup *cgrp = task_memcg(current);
> > [...]
> > + /* cgrp may not have memory controller enabled */
> > + if (!cgrp)
> > + return 0;
>
> Yes, the controller may not be enabled (for a cgroup).
> Just noting that the task_memcg() implementation will fall back to
> root_mem_cgroup in such a case (or nearest ancestor), you may want to
> use cgroup_ss_mask() for proper detection.
Good catch. I get confused between cgrp->subsys and
task->cgroups->subsys sometimes because of different fallback
behavior. IIUC cgrp->subsys should have NULL if the memory controller
is not enabled (no nearest ancestor fallback), and hence I can use
memory_subsys_enabled() that I defined just above task_memcg() to test
for this (I have no idea why I am not already using it here). Is my
understanding correct?
>
> Regards,
> Michal
next prev parent reply other threads:[~2022-06-03 19:53 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-20 1:21 [PATCH bpf-next v1 0/5] bpf: rstat: cgroup hierarchical stats Yosry Ahmed
2022-05-20 1:21 ` [PATCH bpf-next v1 1/5] cgroup: bpf: add a hook for bpf progs to attach to rstat flushing Yosry Ahmed
2022-05-21 11:16 ` kernel test robot
2022-05-21 11:26 ` kernel test robot
2022-05-21 11:26 ` kernel test robot
2022-05-20 1:21 ` [PATCH bpf-next v1 2/5] cgroup: bpf: add cgroup_rstat_updated() and cgroup_rstat_flush() kfuncs Yosry Ahmed
2022-05-20 7:24 ` Tejun Heo
2022-05-20 9:13 ` Yosry Ahmed
2022-05-20 9:36 ` Kumar Kartikeya Dwivedi
2022-05-20 11:16 ` Tejun Heo
2022-05-20 16:06 ` Yosry Ahmed
2022-05-20 15:14 ` Yonghong Song
2022-05-20 16:08 ` Yosry Ahmed
2022-05-20 16:16 ` Yonghong Song
2022-05-20 16:20 ` Yosry Ahmed
2022-05-21 11:47 ` kernel test robot
2022-05-20 1:21 ` [PATCH bpf-next v1 3/5] bpf: Introduce cgroup iter Yosry Ahmed
2022-05-20 7:41 ` Tejun Heo
2022-05-20 7:58 ` Yosry Ahmed
2022-05-20 8:11 ` Tejun Heo
2022-05-20 11:27 ` Tejun Heo
2022-05-20 16:29 ` Yonghong Song
2022-05-20 16:45 ` Tejun Heo
2022-05-20 19:42 ` Hao Luo
2022-05-20 21:18 ` Yosry Ahmed
2022-05-20 22:19 ` Alexei Starovoitov
2022-05-20 22:36 ` Yosry Ahmed
2022-05-20 22:57 ` Tejun Heo
2022-05-21 0:59 ` Yonghong Song
2022-05-21 2:34 ` Hao Luo
2022-05-23 23:58 ` Andrii Nakryiko
2022-05-24 0:53 ` Hao Luo
2022-05-24 1:30 ` Andrii Nakryiko
2022-05-20 21:49 ` Hao Luo
2022-05-21 0:58 ` Yonghong Song
2022-05-21 2:43 ` Hao Luo
2022-05-21 4:53 ` Tejun Heo
2022-05-21 0:52 ` Yonghong Song
2022-05-20 17:30 ` Hao Luo
2022-05-20 1:21 ` [PATCH bpf-next v1 4/5] selftests/bpf: extend cgroup helpers Yosry Ahmed
2022-05-20 1:21 ` [PATCH bpf-next v1 5/5] bpf: add a selftest for cgroup hierarchical stats collection Yosry Ahmed
2022-05-20 16:09 ` Yonghong Song
2022-05-20 16:18 ` Yosry Ahmed
2022-05-24 0:01 ` Andrii Nakryiko
2022-05-24 2:35 ` Yosry Ahmed
2022-06-03 16:23 ` Michal Koutný
2022-06-03 19:52 ` Yosry Ahmed [this message]
2022-06-06 12:32 ` Michal Koutný
2022-06-06 19:41 ` Yosry Ahmed
2022-06-07 12:12 ` Michal Koutný
2022-06-07 17:43 ` Yosry Ahmed
2022-06-08 11:17 ` Michal Koutný
2022-06-03 16:22 ` [PATCH bpf-next v1 0/5] bpf: rstat: cgroup hierarchical stats Michal Koutný
2022-06-03 19:47 ` Yosry Ahmed
2022-06-06 12:32 ` Michal Koutný
2022-06-06 19:32 ` Yosry Ahmed
2022-06-06 19:54 ` Kumar Kartikeya Dwivedi
2022-06-06 20:00 ` Yosry Ahmed
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