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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 87AE640005 X-Stat-Signature: 1ywmc8p8dugjx7p3t4n1qki4ppwykj75 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1769481904-415258 X-HE-Meta: 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 S+TFoWtW VZUL0JV0ZJ4SwqSKJiweRQvCUnaG2KOSz+hWU708OJ3BZs83Od0ICtnIQWJBtlAs6JB02Ad9SbzNXrbCd28db4eBBdR7cNAfijULv7zKhOjDfePRYNivzlnFj94tOzMMca3bcruO13XfPHQMuisQHMNL/lEd1WqkSgATriNnakSRZbGxkfC68E877ob3bRbFaVnZ6w0e93iUdaZ+H1sjZZgDEUqAn+CZJs2N6xaAqiGEzT2pgP3y1UNWzAr8cTsIB6Xr2m/+uvEj+CWfEPDWj8hp6IjGJJWAbYaOe1lXeMFmEctAGA8TFVqvAQQ== 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: 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; } +/** + * bpf_task_is_oom_victim - Check if the task has been marked as an OOM victim + * @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 some + * 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(); 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) BTF_ID_LIST_SINGLE(bpf_oom_ops_ids, struct, bpf_oom_ops) -- 2.52.0