From nobody Sun Feb 8 23:04:04 2026 Received: from out-170.mta0.migadu.com (out-170.mta0.migadu.com [91.218.175.170]) (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 BE35C30E0F9 for ; Tue, 27 Jan 2026 02:45:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769481906; cv=none; b=npGbV9VFvv3XAQz4ncGno5muzFlnhfMa07lU6sM/Z9MnZUoDR6RVJ+9zt1yCzKy2oqQBu8fMnwKQJS+2CCMIODSnJbQNkYR1wzObvtGkyGLMInjZ1OYLHHbgfpC/0CffvcF+F1YAqNI8DEHHx5b/0y9fZgeoP6ed552qiE3oSdM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769481906; c=relaxed/simple; bh=X3zboxeJAOms020zMMLXsjZSmbwOolqLIY8+jYjPq3k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JDr2sWxzD1XYf+eQZCrkEbVOJ67pmzSWkfwVPv2dNNxj2Tz3gMzrVWNIl6P+N9gUFD7FNc4f5QuF3FmTN9VuIkX3HJimLys7auC1O8OdxZapokU8EMgCBZT+S8hXPJ4kcND/P8VlkWhRySUAkeOOBjoMfAPmn1n1N+Ck8haZI/M= 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=QbI4wHPQ; arc=none smtp.client-ip=91.218.175.170 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="QbI4wHPQ" 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=1769481903; 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=c1BqMEOY9X0l6L8QNWTbBYeaa++beJxlVBc9vvQg0ZY=; b=QbI4wHPQfRxt8LfCF+viV3xkrlBU6NP5bBWY35N/NkqWng0zJlvecrQMEa1z3u7pww2PWr Tv5enAhdzVLQfRrxGb4aYKamVhrbRnhLb2bC3PaWMu7jqL3WSp44XVhQf5aLobBHS07fRT yO6H6ZRa3Mi6o/210cWpFLKHLzbagDY= From: Roman Gushchin To: bpf@vger.kernel.org Cc: Michal Hocko , Alexei Starovoitov , Matt Bobrowski , Shakeel Butt , JP Kobryn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Suren Baghdasaryan , Johannes Weiner , Andrew Morton , Roman Gushchin Subject: [PATCH bpf-next v3 10/17] mm: introduce bpf_task_is_oom_victim() kfunc Date: Mon, 26 Jan 2026 18:44:13 -0800 Message-ID: <20260127024421.494929-11-roman.gushchin@linux.dev> In-Reply-To: <20260127024421.494929-1-roman.gushchin@linux.dev> References: <20260127024421.494929-1-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" Export tsk_is_oom_victim() helper as a BPF kfunc. It's very useful to avoid redundant oom kills. Signed-off-by: Roman Gushchin Suggested-by: Michal Hocko --- mm/oom_kill.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 8f63a370b8f5..53f9f9674658 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -1381,10 +1381,24 @@ __bpf_kfunc int bpf_out_of_memory(struct mem_cgroup= *memcg__nullable, return ret; } =20 +/** + * bpf_task_is_oom_victim - Check if the task has been marked as an OOM vi= ctim + * @task: task to check + * + * Returns true if the task has been previously selected by the OOM killer + * to be killed. It's expected that the task will be destroyed soon and so= me + * memory will be freed, so maybe no additional actions required. + */ +__bpf_kfunc bool bpf_task_is_oom_victim(struct task_struct *task) +{ + return tsk_is_oom_victim(task); +} + __bpf_kfunc_end_defs(); =20 BTF_KFUNCS_START(bpf_oom_kfuncs) BTF_ID_FLAGS(func, bpf_oom_kill_process, KF_SLEEPABLE) +BTF_ID_FLAGS(func, bpf_task_is_oom_victim) BTF_KFUNCS_END(bpf_oom_kfuncs) =20 BTF_ID_LIST_SINGLE(bpf_oom_ops_ids, struct, bpf_oom_ops) --=20 2.52.0