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[109.81.30.108]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1bd69b2a2sm20612325e9.4.2026.10.15.00.04.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Oct 2026 00:04:33 -0700 (PDT) Date: Thu, 15 Oct 2026 09:03:57 +0200 From: Michal Hocko To: Alexis Bouzigues Cc: "akpm@linux-foundation.org" , "liam@infradead.org" , "ljs@kernel.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] mm: nommu: set MMF_OOM_SKIP in exit_mmap() Message-ID: References: <20261013-fix-nommu-exit-mmap-oom-skip-v1-1-cb957cdbfcc3@JohnDeere.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 16AB1100004 X-Rspam-User: X-Stat-Signature: q6ojnnoghkkjj418ziwxn7au7sfupjyw X-HE-Tag: 1792047876-405841 X-HE-Meta: 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 WaXs6Y6w 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed 14-10-26 21:58:52, Alexis Bouzigues wrote: > On Wed, Oct 14, 2026 at 09:50:30AM +0200, Michal Hocko wrote: > > > Set MMF_OOM_SKIP in the NOMMU exit_mmap() once the VMAs are freed, as > > > the MMU version does. > > Is this a real problem that you can actually hit? > > Yes, without this change the oom killer can fail to make progress to > resolve a global oom. Are you really looking into the code or just relying on an LLM? Go and check to learn that the oom reaper is only compiled in with CONFIG_MMU=y -- Michal Hocko SUSE Labs