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From: Tejun Heo <tj@kernel.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
	haoluo@google.com, jolsa@kernel.org, hannes@cmpxchg.org,
	mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com,
	songmuchun@bytedance.com, akpm@linux-foundation.org,
	lizefan.x@bytedance.com, cgroups@vger.kernel.org,
	netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH bpf-next v3 00/13] bpf: Introduce selectable memcg for bpf map
Date: Wed, 7 Sep 2022 05:45:15 -1000	[thread overview]
Message-ID: <Yxi8i3eP4fDDv2+X@slm.duckdns.org> (raw)
In-Reply-To: <Yxi8I4fXXSCi6z9T@slm.duckdns.org>

On Wed, Sep 07, 2022 at 05:43:31AM -1000, Tejun Heo wrote:
> Hello,
> 
> On Fri, Sep 02, 2022 at 02:29:50AM +0000, Yafang Shao wrote:
> ...
> > This patchset tries to resolve the above two issues by introducing a
> > selectable memcg to limit the bpf memory. Currently we only allow to
> > select its ancestor to avoid breaking the memcg hierarchy further. 
> > Possible use cases of the selectable memcg as follows,
> 
> As discussed in the following thread, there are clear downsides to an
> interface which requires the users to specify the cgroups directly.
> 
>  https://lkml.kernel.org/r/YwNold0GMOappUxc@slm.duckdns.org
> 
> So, I don't really think this is an interface we wanna go for. I was hoping
> to hear more from memcg folks in the above thread. Maybe ping them in that
> thread and continue there?

Ah, another thing. If the memcg accounting is breaking things right now, we
can easily introduce a memcg disable flag for bpf memory. That should help
alleviating the immediate breakage while we figure this out.

Thanks.

-- 
tejun


  reply	other threads:[~2022-09-07 15:45 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-02  2:29 [PATCH bpf-next v3 00/13] bpf: Introduce selectable memcg for bpf map Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 01/13] cgroup: Update the comment on cgroup_get_from_fd Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 02/13] bpf: Introduce new helper bpf_map_put_memcg() Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 03/13] bpf: Define bpf_map_{get,put}_memcg for !CONFIG_MEMCG_KMEM Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 04/13] bpf: Call bpf_map_init_from_attr() immediately after map creation Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 05/13] bpf: Save memcg in bpf_map_init_from_attr() Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 06/13] bpf: Use scoped-based charge in bpf_map_area_alloc Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 07/13] bpf: Introduce new helpers bpf_ringbuf_pages_{alloc,free} Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 08/13] bpf: Use bpf_map_kzalloc in arraymap Yafang Shao
2022-09-02  2:29 ` [PATCH bpf-next v3 09/13] bpf: Use bpf_map_kvcalloc in bpf_local_storage Yafang Shao
2022-09-02  2:30 ` [PATCH bpf-next v3 10/13] mm, memcg: Add new helper get_obj_cgroup_from_cgroup Yafang Shao
2022-09-02  2:30 ` [PATCH bpf-next v3 11/13] mm, memcg: Add new helper task_under_memcg_hierarchy Yafang Shao
2022-09-02  2:30 ` [PATCH bpf-next v3 12/13] bpf: Add return value for bpf_map_init_from_attr Yafang Shao
2022-09-02  2:30 ` [PATCH bpf-next v3 13/13] bpf: Introduce selectable memcg for bpf map Yafang Shao
2022-09-07 15:43 ` [PATCH bpf-next v3 00/13] " Tejun Heo
2022-09-07 15:45   ` Tejun Heo [this message]
2022-09-07 16:13     ` Alexei Starovoitov
2022-09-07 16:18       ` Tejun Heo
2022-09-07 16:27         ` Alexei Starovoitov
2022-09-07 17:01           ` Tejun Heo
2022-09-08  2:44             ` Yafang Shao
2022-09-07 22:28   ` Roman Gushchin
2022-09-08  2:37     ` Yafang Shao
2022-09-08  2:43       ` Alexei Starovoitov
2022-09-08  2:48         ` Yafang Shao
2022-09-08 16:13       ` Roman Gushchin
2022-09-13  6:15         ` Yafang Shao
2022-09-16 16:53           ` Roman Gushchin
2022-09-18  3:44             ` Yafang Shao
2022-09-20  2:40               ` Roman Gushchin
2022-09-20 12:42                 ` Yafang Shao
2022-09-20 23:15                   ` Roman Gushchin
2022-09-21  9:36                     ` Yafang Shao

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