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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1766204008; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7evlJ586VgwqQZOIWkPuRy5AVJIYePbARo3wNs1uXHA=; b=M/9+lxqKjAkS2Whu6IcPHOC6uS+J6BOmEpuqgYioua9snBxaNXqlLZhjaWCnuzS2je4zrx ZHUdxUP8dKpFKRqfiaEjLrl7Rmc0Hd0JYC94Ckw80fDzWFSWtbsI4oBICkByRMErctY2lJ ND+aF6yGAOrYSKaC92M0A4oGHt89zCs= From: Roman Gushchin To: bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: JP Kobryn , Alexei Starovoitov , Daniel Borkmann , Shakeel Butt , Michal Hocko , Johannes Weiner , Roman Gushchin Subject: [PATCH bpf-next v2 5/7] mm: introduce BPF kfunc to access memory events Date: Fri, 19 Dec 2025 20:12:48 -0800 Message-ID: <20251220041250.372179-6-roman.gushchin@linux.dev> In-Reply-To: <20251220041250.372179-1-roman.gushchin@linux.dev> References: <20251220041250.372179-1-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Stat-Signature: bqjgc145ekb815aski1nqfj39wx865k9 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3D5821C0002 X-Rspam-User: X-HE-Tag: 1766204013-76883 X-HE-Meta: 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 mTg9dmS2 w8pC2ERlkrfr8Ls/IXoD/pVB5DznS1nfEHU5jqySQee32lndluH2ye//5/XqGlpsh1Jq011HkhwB8BL6P4kaKiWxz18O5svva0qLJdvzD/sF+awGaox4LJGWC8HTk1g19YKMzYO86rt7Bz37JcqW/u5kCifv8dLMhdVNSBPMXEBjXRNkKe0ntJBFZUWDFSe59ktIciQVLO/9AKKwVZWjpw6UQfdt7QgA98YsgzuLIeJ2rcxOtpaLygmu/byinVm1OFUtG X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: JP Kobryn Introduce BPF kfunc to access memory events, e.g.: MEMCG_LOW, MEMCG_MAX, MEMCG_OOM, MEMCG_OOM_KILL etc. Signed-off-by: JP Kobryn Signed-off-by: Roman Gushchin Acked-by: Shakeel Butt --- mm/bpf_memcontrol.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/mm/bpf_memcontrol.c b/mm/bpf_memcontrol.c index d84fe6f3ed43..858eb43766ce 100644 --- a/mm/bpf_memcontrol.c +++ b/mm/bpf_memcontrol.c @@ -103,6 +103,22 @@ __bpf_kfunc unsigned long bpf_mem_cgroup_usage(struct mem_cgroup *memcg) return mem_cgroup_usage(memcg, false) * PAGE_SIZE; } +/** + * bpf_mem_cgroup_memory_events - Read memory cgroup's memory event value + * @memcg: memory cgroup + * @event: memory event id + * + * Returns current memory event count. + */ +__bpf_kfunc unsigned long bpf_mem_cgroup_memory_events(struct mem_cgroup *memcg, + enum memcg_memory_event event) +{ + if (event >= MEMCG_NR_MEMORY_EVENTS) + return (unsigned long)-1; + + return atomic_long_read(&memcg->memory_events[event]); +} + /** * bpf_mem_cgroup_page_state - Read memory cgroup's page state counter * @memcg: memory cgroup @@ -137,6 +153,7 @@ BTF_ID_FLAGS(func, bpf_get_mem_cgroup, KF_TRUSTED_ARGS | KF_ACQUIRE | KF_RET_NUL BTF_ID_FLAGS(func, bpf_put_mem_cgroup, KF_TRUSTED_ARGS | KF_RELEASE) BTF_ID_FLAGS(func, bpf_mem_cgroup_vm_events, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_mem_cgroup_memory_events, KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_mem_cgroup_usage, KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_mem_cgroup_page_state, KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_mem_cgroup_flush_stats, KF_TRUSTED_ARGS | KF_SLEEPABLE) -- 2.52.0