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[73.158.249.15]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2fa286ed9bcsm3610227a91.5.2025.02.08.13.16.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 08 Feb 2025 13:16:16 -0800 (PST) Date: Sat, 8 Feb 2025 13:16:13 -0800 From: =?iso-8859-1?Q?J=F6rn?= Engel To: Lorenzo Stoakes Cc: Uday Shankar , Muchun Song , Andrew Morton , linux-mm@kvack.org, "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Oscar Salvador Subject: Re: [bug report?] unintuitive behavior when mapping over hugepage-backed PROT_NONE regions Message-ID: References: <82afe852-4098-4eea-a646-37beab88604f@lucifer.local> <935c5dc8-03c6-4988-9bef-3c2de09e9efa@lucifer.local> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 0F85F40007 X-Stat-Signature: x99cs6tbfo71g93j87w7fxn74rucd1h9 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1739049377-50497 X-HE-Meta: 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 CCEIuqji 08i2R1FW7eYkCtQTn2vamkO5CVfSRU3gptozYAzkQu42yC6VDvMiFD01b8/5NLqEBzHe15GjGE4KnZsA/ob/DWZVXiiVVYbOzUz80aZtqeXcVFaasyiOZErVtwoHSkJBEAeQ4FNvxQjLpJsDI2SmYxjli89Mf+xQZVuWvvOPVjj2lGWHcgkompHHLM25hOjNHdHrdAeM6evS35tl0GHhA3PO4kEVsqCatGmefgVpMHoDzcPw6ZdTNx30230ja+iIJMocBAJFOTjh/SQ4Bp/kUhFLIyx6JdyemkChuLaFJq9kuWMI3uxF/28QUj9bPTYUf9emXbaFaUN9IKsB89fskgfxaxGupHBUdxpH1UiHy72BvN7SQHZJutrUqIkIkaYWh5K9dUzJ/1TuWABkwM7qxUdfyb8p6GOlI2kV07HD69+NqdDso+ERiMIpE7MpGHXTdZO/wg/fyhzmXU2rWWuqMy0qPrG5/D3Yy9S+b X-Bogosity: Unsure, tests=bogofilter, spamicity=0.497820, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, Feb 08, 2025 at 06:00:39PM +0000, Lorenzo Stoakes wrote: > On Sat, Feb 08, 2025 at 09:53:27AM -0800, Jörn Engel wrote: > > Funny you should mention that ;) we will soon no longer have this problem, > and MAJOR efforts have gone into making this possible under RCU. The 6.12 > release was one long battle to get the key series in for this :P > > Which is in fact again Liam's aforementioned, a prerequisite for consistent > observation of VMAs in /proc/$pid/[s]maps[_rollup]. You are my hero, Liam! I looked at the issue some time ago and decided it was too hard to sort out the mess. Jörn -- It's not whether you win or lose, it's how you place the blame. -- unknown