From nobody Wed Dec 17 12:15:57 2025 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (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 234A51DED4E for ; Tue, 18 Mar 2025 06:10:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742278240; cv=none; b=CtPjoupo3MVsDwt4UvsnnAcDzOYt2OMMFwB1F3MwjjnlBdrrw6VsF4W4JmVqt5xn+/UWD84g2p1Rghu2CWscq+UbpPFdXPGz5Bd2VFdX+nGkRFuNEbJ15bzQOG0qr4evu4ZmxTGSrGEt7+80P1quUx9jwRp+uF8/HZXUXoE1yOQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742278240; c=relaxed/simple; bh=WuvlYnrWWxu7g30G6TS0IykBZnJ6thjOo/dMA2gvvaE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GWbW3/VKviHKShLevnQCTtx171QuViXKNeiJ1yltSUXWz8Ul87k3oB27diK71a15aXjT/Rjyx8s88b+li+FvfBy7oN1IFNDwXNH0HdITWk8mbFK/IVbd/HBfJ+p4y0Nx2BKedPdBtkGDpUibFSPTi0kLtonDFNkBQTDjb0tJ0q0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4ZH1fB3fqdz4f3khS for ; Tue, 18 Mar 2025 14:10:10 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.75]) by mail.maildlp.com (Postfix) with ESMTP id 233171A1265 for ; Tue, 18 Mar 2025 14:10:33 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP2 (Coremail) with SMTP id Syh0CgD3AGRVDtln65ErGw--.37695S10; Tue, 18 Mar 2025 14:10:32 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: tim.c.chen@linux.intel.com, ryncsn@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 8/8] mm: swap: replace cluster_swap_free_nr() with swap_entries_put_[map/cache]() Date: Tue, 18 Mar 2025 23:06:14 +0800 Message-Id: <20250318150614.6415-9-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250318150614.6415-1-shikemeng@huaweicloud.com> References: <20250318150614.6415-1-shikemeng@huaweicloud.com> 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 X-CM-TRANSID: Syh0CgD3AGRVDtln65ErGw--.37695S10 X-Coremail-Antispam: 1UD129KBjvJXoWxCF4UZF4rAFy8Zw1fGF4fuFg_yoW5Xr45pF 9agrn8Kr4xJr1xJr4xAw4DZryav397W3WUJFy7Ww1rZasrKr92qF1vyrWxCry5G34kurZI k3Zrtr9ruFs0yr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJw A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2 AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV W8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU s3kuDUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ Content-Type: text/plain; charset="utf-8" Replace cluster_swap_free_nr() with swap_entries_put_[map/cache]() to remove repeat code and leverage batch-remove for entries with last flag. After removing cluster_swap_free_nr, only functions with "_nr" suffix could free entries spanning cross clusters. Add corresponding description in comment of swap_entries_put_map_nr() as is first function with "_nr" suffix and have a non-suffix variant function swap_entries_put_map(). Signed-off-by: Kemeng Shi --- mm/swapfile.c | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 919daaa3922a..7f3e9ce998f9 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1511,6 +1511,11 @@ static bool swap_entries_put_map(struct swap_info_st= ruct *si, =20 } =20 +/* + * Only functions with "_nr" suffix are able to free entries spanning + * cross multi clusters, so ensure the range is within a single cluster + * when freeing entries with functions without "_nr" suffix. + */ static bool swap_entries_put_map_nr(struct swap_info_struct *si, swp_entry_t entry, int nr) { @@ -1561,21 +1566,6 @@ static void swap_entries_free(struct swap_info_struc= t *si, partial_free_cluster(si, ci); } =20 -static void cluster_swap_free_nr(struct swap_info_struct *si, - unsigned long offset, int nr_pages, - unsigned char usage) -{ - struct swap_cluster_info *ci; - unsigned long end =3D offset + nr_pages; - - ci =3D lock_cluster(si, offset); - do { - swap_entry_put_locked(si, ci, swp_entry(si->type, offset), - usage); - } while (++offset < end); - unlock_cluster(ci); -} - /* * Caller has made sure that the swap device corresponding to entry * is still around or has not been recycled. @@ -1592,7 +1582,7 @@ void swap_free_nr(swp_entry_t entry, int nr_pages) =20 while (nr_pages) { nr =3D min_t(int, nr_pages, SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER= ); - cluster_swap_free_nr(sis, offset, nr, 1); + swap_entries_put_map(sis, swp_entry(sis->type, offset), nr); offset +=3D nr; nr_pages -=3D nr; } @@ -3615,11 +3605,13 @@ int swapcache_prepare(swp_entry_t entry, int nr) return __swap_duplicate(entry, SWAP_HAS_CACHE, nr); } =20 +/* + * Caller should ensure entries belong to the same folio so + * the entries won't span cross cluster boundary. + */ void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int n= r) { - unsigned long offset =3D swp_offset(entry); - - cluster_swap_free_nr(si, offset, nr, SWAP_HAS_CACHE); + swap_entries_put_cache(si, entry, nr); } =20 struct swap_info_struct *swp_swap_info(swp_entry_t entry) --=20 2.30.0