From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Hongfu Li" <hongfu.li@linux.dev>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"JP Kobryn" <jp.kobryn@linux.dev>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"Andrew Morton" <akpm@linux-foundation.org>
Cc: <bpf@vger.kernel.org>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, "Hongfu Li" <lihongfu@kylinos.cn>
Subject: Re: [PATCH] mm/bpf: Add bpf_mem_cgroup_memory_events_local() kfunc
Date: Wed, 11 Nov 2026 15:44:36 +0000 [thread overview]
Message-ID: <DMSHX7SU7M9U.2YBBRPD8DYGWN@gmail.com> (raw)
In-Reply-To: <20261111-for-bpf_memctl-1111-v1-1-8b56784d9e5a@kylinos.cn>
On Tue, Nov 10, 2026 at 10:56 PM Hongfu Li <hongfu.li@linux.dev> wrote:
> Expose the local counters to BPF programs with a kfunc, so that a
> policy can attribute events to a specific cgroup instead of only
> seeing the aggregate of the subtree.
No. The prog can do it today without a new kfunc:
memcg = bpf_get_mem_cgroup(css);
if (!memcg)
return 0;
cnt = memcg->memory_events_local[MEMCG_OOM_KILL].counter;
bpf_put_mem_cgroup(memcg);
memcg is a trusted pointer to a struct that is in BTF.
pw-bot: cr
prev parent reply other threads:[~2026-11-11 15:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 6:56 [PATCH] mm/bpf: Add bpf_mem_cgroup_memory_events_local() kfunc Hongfu Li
2026-11-11 7:06 ` sashiko-bot
2026-11-11 15:44 ` Alexei Starovoitov [this message]
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