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[109.81.26.156]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4806ce4c515sm55723105e9.11.2026.01.28.03.19.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 03:19:43 -0800 (PST) Date: Wed, 28 Jan 2026 12:19:42 +0100 From: Michal Hocko To: Roman Gushchin Cc: bpf@vger.kernel.org, Alexei Starovoitov , Matt Bobrowski , Shakeel Butt , JP Kobryn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Suren Baghdasaryan , Johannes Weiner , Andrew Morton Subject: Re: [PATCH bpf-next v3 07/17] mm: introduce BPF OOM struct ops Message-ID: References: <20260127024421.494929-1-roman.gushchin@linux.dev> <20260127024421.494929-8-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260127024421.494929-8-roman.gushchin@linux.dev> X-Rspamd-Queue-Id: 5FF491C0007 X-Stat-Signature: wubtqhswf3df5cngohi17jt9utiex1po X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1769599185-374030 X-HE-Meta: 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 Gy8fa24p SCJ6bKhQLjKNCjMibi8wzDtdo1sWLQx4Bv7nhp734GCSUrI0uWAe3eA6R7lEN/5odwP5cOQ9VCET020qNzQpvdpdOw7xC0YNvVNmokXf7LK5b0tXpFx8ar4sqe7JGCfHAqhnHiQ5qzV1t+wPn/yQoLHqapVcpN457cpHMIUxxI7b1VHEGafmBkl1OqfnbHMydBj/zyI574+/PMzm4uc8yoadVsSgHHwz7rKHZ9hQUf7Al5K+lKXwe7J1GYychcZAPrxyKGfVWQuoGpSW8sWVZ8I54cddPLyoVPvUfr02DdKLBSFMpoVqUdcIBxN8YOMt4Cf4MTY91nFU4R5FbWqjV5ZVTJa3oeAaNgXYZRtoQu+FuT/o= 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: Once additional point I forgot to mention previously On Mon 26-01-26 18:44:10, Roman Gushchin wrote: > @@ -1168,6 +1180,13 @@ bool out_of_memory(struct oom_control *oc) > return true; > } > > + /* > + * Let bpf handle the OOM first. If it was able to free up some memory, > + * bail out. Otherwise fall back to the kernel OOM killer. > + */ > + if (bpf_handle_oom(oc)) > + return true; > + > select_bad_process(oc); > /* Found nothing?!?! */ > if (!oc->chosen) { Should this check for is_sysrq_oom and always use the in kernel OOM handling for Sysrq triggered ooms as a failsafe measure? -- Michal Hocko SUSE Labs