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Wed, 11 Nov 2026 07:44:37 -0800 (PST) Received: from localhost ([153.61.198.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b18142fa70sm4663040a91.16.2026.11.11.07.44.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2026 07:44:36 -0800 (PST) Content-Type: text/plain; charset=UTF-8 Date: Wed, 11 Nov 2026 15:44:36 +0000 Message-Id: Subject: Re: [PATCH] mm/bpf: Add bpf_mem_cgroup_memory_events_local() kfunc From: "Alexei Starovoitov" To: "Hongfu Li" , "Roman Gushchin" , "JP Kobryn" , "Shakeel Butt" , "Andrew Morton" Cc: , , , "Hongfu Li" In-Reply-To: <20261111-for-bpf_memctl-1111-v1-1-8b56784d9e5a@kylinos.cn> References: <20261111-for-bpf_memctl-1111-v1-1-8b56784d9e5a@kylinos.cn> Content-Transfer-Encoding: 8bit X-Archived-By: MIME-Version: 1.0 X-Rspamd-Server: rspam06 X-Stat-Signature: 9e3x5nmi1c8btjdar4b9yqgp18bhfuci X-Spam-Status: No, score=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Rspamd-Queue-Id: 0143120002 X-Rspam-User: X-HE-Tag: 1794411878-438972 X-HE-Meta: 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 chXCar3X 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Tue, Nov 10, 2026 at 10:56 PM Hongfu Li 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