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Fri, 2 Feb 2024 12:27:48 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id QBroNsTfvGXUfwAAD6G6ig (envelope-from ); Fri, 02 Feb 2024 12:27:48 +0000 Date: Fri, 2 Feb 2024 13:27:48 +0100 From: Michal Hocko To: Lance Yang Cc: akpm@linux-foundation.org, zokeefe@google.com, david@redhat.com, songmuchun@bytedance.com, shy828301@gmail.com, peterx@redhat.com, minchan@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse Message-ID: References: <20240201125226.28372-1-ioworker0@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: CEE4680002 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: xkntfxdiwh1mpaqqxs5nzzy3qbk5ip55 X-HE-Tag: 1706876870-17798 X-HE-Meta: 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 QuMQvh6J wEQuuJ7DSfwD+2MLshTflrDq7tDy6sUO/Ju2LlCNk8hrrkiTq4738VYowzILVEhgG75E6OTpM4xJMuDa3KjnqGhNIqJDrYCtn8wLmllNxkw6hKq5q6U8FgumlsMQQfbCwETQAtNLS+LQ5TbDS5OaGIthCd7x1T2eAA7y+Hoz9GziSRfyW+Qg519oKpP33pCF/dn+ZlaqU2+ZIHVFrvVFsl/z/Uw== 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: On Fri 02-02-24 19:18:31, Lance Yang wrote: > IMO, since it's treated the same as pte_none, > perhaps lazyfree pages shouldn't be copied to > the new huge page. Why? The content of MADV_FREE page is valid until it is reclaimed. -- Michal Hocko SUSE Labs