From nobody Fri Feb 13 03:18:37 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FC6313F442 for ; Tue, 4 Jun 2024 04:21:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717474904; cv=none; b=Itsvackrgdmd5GbNF2T5uUBwTZBtVYmAERK8N/yZHMQEnpeGHMJeHfdEak0Hb2CplCbDcum4Aar5kuN+nTm2MMf1hN3TZjCu/lYQUpqn8o90jUVpRPjbLh3UP3G69YWRM4Hv3HZRXxd8ILO+szuqM10CA50uuogsQB/QSi1m/Ys= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717474904; c=relaxed/simple; bh=8rn+89eKdjpnGRg9SATPm/FCPUFDqEev/EjdjwcPsX4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d/veBnqDBCVrx39cayeXaNwOQRdom211T1cG3QXr9cdMQ7B7uAKxqtYmRLoFSVJLsrT2v9xAiw3lNtET6VSihDcnhJEzYDrLkASW7vxSxTG/8vmY14Vl4srnqzugsDOimxffl68FMayswuC24XHRpWl0DI67FfCn4RPy9Z+pv5A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BrDK39h9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BrDK39h9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83CC0C32786; Tue, 4 Jun 2024 04:21:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717474903; bh=8rn+89eKdjpnGRg9SATPm/FCPUFDqEev/EjdjwcPsX4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BrDK39h9fOI8f7AxXV5VEsT+hcMTOXnlEQKMg/6aZTTxZNso2DZQD1OtJONwRjRkG GTotLiw6R+JnHOjQ+F4Z2QdlRSZJW/+/D2lxocg2C9GOt0+eA01KBD7PK6qZKDn93v oJmb0/AUR5k1JJjqlHrm2uenG78NcxWZ2ZRyhPdoGDBTxMnKmqVIcSzL2j5jAAFEig HQbh7x3JlQMRQX9xktOcMM1uYVXNp75jz/PFQLKdr4hYqEj/e+x0sMkhIMH8YDhZfw 1Lu1MRZv5GG3zPR5gLx+97v8YSf9U4PF/EC2hDxnpJ5FSUVfzwXiBharDCB7Osnutq bkpUX1xY27wMg== From: alexs@kernel.org To: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, izik.eidus@ravellosystems.com, willy@infradead.org, aarcange@redhat.com, chrisw@sous-sol.org, hughd@google.com, david@redhat.com Cc: "Alex Shi (tencent)" Subject: [PATCH 04/10] mm/ksm: add identical_folio func Date: Tue, 4 Jun 2024 12:24:46 +0800 Message-ID: <20240604042454.2012091-5-alexs@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240604042454.2012091-1-alexs@kernel.org> References: <20240604042454.2012091-1-alexs@kernel.org> 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" From: "Alex Shi (tencent)" To replace pages_identical() func and further reduce the 'page' using in try_to_merge_one_page function. Signed-off-by: Alex Shi (tencent) --- include/linux/mm.h | 17 +++++++++++++++++ mm/ksm.c | 2 +- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 9849dfda44d4..2d1f16ffc6ac 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4164,6 +4164,23 @@ static inline void setup_nr_node_ids(void) {} =20 extern int memcmp_pages(struct page *page1, struct page *page2); =20 +static inline int identical_folio(struct folio *folio1, struct folio *foli= o2) +{ + int i, nr1, nr2, ret =3D 0; + + nr1 =3D folio_nr_pages(folio1); + nr2 =3D folio_nr_pages(folio2); + if (nr1 !=3D nr2) + return 0; + + for (i =3D 0; i < nr1; i++) { + ret =3D memcmp_pages(folio_page(folio1, i), folio_page(folio2, i)); + if (ret) + break; + } + + return !ret; +} static inline int pages_identical(struct page *page1, struct page *page2) { return !memcmp_pages(page1, page2); diff --git a/mm/ksm.c b/mm/ksm.c index 21bfa9bfb210..2e4790842515 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1527,7 +1527,7 @@ static int try_to_merge_one_page(struct vm_area_struc= t *vma, struct folio *folio if (!folio_test_dirty(folio)) folio_set_dirty(folio); err =3D 0; - } else if (pages_identical(page, kpage)) + } else if (identical_folio(folio, kfolio)) err =3D replace_page(vma, page, kpage, orig_pte); } =20 --=20 2.43.0