From nobody Mon Feb 9 05:52:09 2026 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CB6F1E5B7B for ; Fri, 19 Dec 2025 01:58:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766109506; cv=none; b=AilnRLwMOmirvO5pEMhqJIXqDAFqh0Z205XQQCr05x2EDaMzylRzDbT4Lsahc0HZaGC15miDF6h/fd/gEQ+W50stb5XCavfTVBFW7CgE+bG04Jpu2jP8kUaWU8lN1UgDKOu1Mu9pAh6yYFGyy8nyzvQ+NHf4utHXZBbJYDKt7X0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766109506; c=relaxed/simple; bh=PHYYK5E5zfTGu+Kk3p5u09VrYp7+kWkzQ6Gj1ieqaeI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VWE3vc1ebSkFhb/97P/0NswjlqfyBh7onUFnQPN9V+0ugS1JvPeArkyEsovpZKmmTBd0nhajQuuZNHa5uiyrx19ZVnCxt1PSXxppGCGEk34cYxcQId53g3WTRqhH5qxVaSVsnPDOJJbwXwE+LvZ8kvp6IX37LLok6ATdQaUE1yU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=pmCTAcXL; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="pmCTAcXL" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1766109499; 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=qQdgJ5EpKkLsM5Kk9PcaQQ6OLHn5Pe6OjvVecT6Mnh4=; b=pmCTAcXLYKihBkgCQMNV3HqiC9p2aTLFPd/YlGQ2bQ18mrslVJ2em/TbMnKHHJd5lukfXG aiG3o3lmFbCP99qsZzUyINwZJQZscBymtLt4tHMlbxKIL/KAgve4/dpn8Q1SdumJ0ap9Li w04mAMYAdHgm7zmM/xmRtRr80LHW29g= 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 Subject: [PATCH bpf-next v1 5/6] mm: introduce BPF kfunc to access memory events Date: Thu, 18 Dec 2025 17:57:49 -0800 Message-ID: <20251219015750.23732-6-roman.gushchin@linux.dev> In-Reply-To: <20251219015750.23732-1-roman.gushchin@linux.dev> References: <20251219015750.23732-1-roman.gushchin@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" 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 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 4d9d7d909f6c..75076d682f75 100644 --- a/mm/bpf_memcontrol.c +++ b/mm/bpf_memcontrol.c @@ -99,6 +99,22 @@ __bpf_kfunc unsigned long bpf_mem_cgroup_usage(struct me= m_cgroup *memcg) return page_counter_read(&memcg->memory) * PAGE_SIZE; } =20 +/** + * 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 >=3D 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 @@ -133,6 +149,7 @@ 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) =20 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_SLEEPA= BLE) --=20 2.52.0