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Fri, 02 Feb 2024 04:53:02 -0800 (PST) MIME-Version: 1.0 References: <20240201125226.28372-1-ioworker0@gmail.com> In-Reply-To: From: Lance Yang Date: Fri, 2 Feb 2024 20:52:48 +0800 Message-ID: Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse To: Michal Hocko 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 62F2218001E X-Rspam-User: X-Stat-Signature: 18a4sab4oagwpbyxwerqutizjretrsbd X-Rspamd-Server: rspam03 X-HE-Tag: 1706878383-395972 X-HE-Meta: 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 HfxYpTRN oPVRBAPRAq780sF4AVywLB5GoLZk43m/139KIm+cXZpk3PyBszapKaQdSQPpqB43iR1ixGjuz9OffWhZzZcHQNxxsO8OPkuWdD7mgpLc/14rE3E3WSjFwhFfkkCP1BH94gSbmxKOruBP6m/EZ6u/6cIDyE+4J4LAoz7j6/bxz02BFlhbLkhUDv/7eNCo9Oxx0uEBKHYnaUhBAYnOvr2Nz8vOf6wfBXBTHz8yej6yzufiUX4eUijPIO6RZnFKpZIiCRy1uaxBj+Du5SFzFlOwzmlIiszOoFbLCqm2fIT/P24osZ4qn/j36zO7ZrgUKze3+HxRnTRJebDBLPaVXmhdmRmYSQDkCkxV9YlwOeD5SJkGtlkIHglh/0nuTLi3/UAYP2RZDFY83nK4KjcVEe5Bx+Yo4EpwtJfIGxBgY X-Bogosity: Ham, tests=bogofilter, spamicity=0.027602, 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, Feb 2, 2024 at 8:27=E2=80=AFPM Michal Hocko wrote= : > > 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. IMO, if MADV_FREE pages are considered valid until reclaimed, treating them the same as pte_none might pose a conflict. Thanks, Lance > -- > Michal Hocko > SUSE Labs