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Thu, 24 Apr 2025 08:38:48 -0700 (PDT) Received: from localhost.localdomain ([43.224.245.237]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-22db5221c8dsm14841445ad.259.2025.04.24.08.38.46 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 24 Apr 2025 08:38:47 -0700 (PDT) From: Wenchao Hao To: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Wenchao Hao Subject: [PATCH] mm/compaction: do not break pages whose order is larger than target order Date: Thu, 24 Apr 2025 23:38:15 +0800 Message-Id: <20250424153815.4003-1-haowenchao22@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When scanning free pages for memory compaction, if the compaction target order is explicitly specified, do not split pages in buddy whose order are larger than compaction target order. Signed-off-by: Wenchao Hao --- mm/compaction.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 3925cb61dbb8..b0ed0831c400 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -656,6 +656,17 @@ static unsigned long isolate_freepages_block(struct co= mpact_control *cc, =20 /* Found a free page, will break it into order-0 pages */ order =3D buddy_order(page); + + /* + * Do not break free pages whose order is larger than + * compact's desired order + */ + if (cc->order !=3D -1 && order >=3D cc->order) { + blockpfn +=3D (1 << order) - 1; + page +=3D (1 << order) - 1; + goto isolate_fail; + } + isolated =3D __isolate_free_page(page, order); if (!isolated) break; --=20 2.34.1