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[109.81.31.109]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4772fe5719csm17619365e9.3.2025.10.31.02.05.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Oct 2025 02:05:59 -0700 (PDT) Date: Fri, 31 Oct 2025 10:05:58 +0100 From: Michal Hocko To: Roman Gushchin Cc: Andrew Morton , linux-kernel@vger.kernel.org, Alexei Starovoitov , Suren Baghdasaryan , Shakeel Butt , Johannes Weiner , Andrii Nakryiko , JP Kobryn , linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Kumar Kartikeya Dwivedi , Tejun Heo Subject: Re: [PATCH v2 07/23] mm: introduce bpf_oom_kill_process() bpf kfunc Message-ID: References: <20251027231727.472628-1-roman.gushchin@linux.dev> <20251027231727.472628-8-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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251027231727.472628-8-roman.gushchin@linux.dev> On Mon 27-10-25 16:17:10, Roman Gushchin wrote: > Introduce bpf_oom_kill_process() bpf kfunc, which is supposed > to be used by BPF OOM programs. It allows to kill a process > in exactly the same way the OOM killer does: using the OOM reaper, > bumping corresponding memcg and global statistics, respecting > memory.oom.group etc. > > On success, it sets om_control's bpf_memory_freed field to true, > enabling the bpf program to bypass the kernel OOM killer. > > Signed-off-by: Roman Gushchin LGTM Just a minor question > + /* paired with put_task_struct() in oom_kill_process() */ > + task = tryget_task_struct(task); Any reason this is not a plain get_task_struct? -- Michal Hocko SUSE Labs