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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-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 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