From nobody Wed Dec 17 03:04:18 2025 Received: from out30-113.freemail.mail.aliyun.com (out30-113.freemail.mail.aliyun.com [115.124.30.113]) (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 30411210F8 for ; Tue, 18 Jun 2024 06:54:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.113 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718693674; cv=none; b=lU8mOrSIx1IpUaNA8ztfI7DTMMQhDowSHp2dwjhxG15dq3C/g8V2cj5NdjzGNKbyXtl3hHTEwpbkJo7Rye5Ef3eXAw9X5l+yVybXXkUWF060J0G6Mb6oKbUycndUw4mNo73HMgSILH8/WzG24hQyafayKRCBZ9Xc07fjYZvqGHI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718693674; c=relaxed/simple; bh=89pIoAXavdFIN8K8yf6MCqWgIZXiI9HwlIwNMVvrXm4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=bkRAT9s1jvDsAU/vzVwVdHfsuZy8DdxxTv2ujZjh/Xx+pEP3OhBV7iNzSAWu3rZlsvjr9c5oDlFhXRlEbvkl8IRzP0aokoFu/cGbM9mzGOM3ki2hnVXLuPDGqXUqZsQ1S3mTsEUcIF3+v4R3yBjKMq+lNKbIzzXYql0mSrpIHNM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=jPV10q7o; arc=none smtp.client-ip=115.124.30.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="jPV10q7o" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1718693670; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=yoIYIBJL5vLTtJOJekDK/vHyVKGOuJ66AVuG1N/Iti4=; b=jPV10q7olMSR8lQVPiAVl3vfo2TAPTkGrKgZXo3xtI56kZoEUXzLPXwZzQvh6nki6PLOEXw94WwZmqvUs/4USnES2yUHRFaJE4DD7xLqPz+v6F1kg7IKhG8NAfmRLKE1qRS4XxzEby7hfRHnSm2LBa+0ZDgXtbcn7yD9ShaN4+A= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067112;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=17;SR=0;TI=SMTPD_---0W8jKUXF_1718693668; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0W8jKUXF_1718693668) by smtp.aliyun-inc.com; Tue, 18 Jun 2024 14:54:28 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hughd@google.com Cc: willy@infradead.org, david@redhat.com, wangkefeng.wang@huawei.com, chrisl@kernel.org, ying.huang@intel.com, 21cnbao@gmail.com, ryan.roberts@arm.com, shy828301@gmail.com, ziy@nvidia.com, ioworker0@gmail.com, da.gomez@samsung.com, p.raghav@samsung.com, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/9] mm: vmscan: add validation before spliting shmem large folio Date: Tue, 18 Jun 2024 14:54:13 +0800 Message-Id: <413866f2f2d996cfbb5c906467b36c96b1a82e2d.1718690645.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: References: 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" Add swap available space validation before spliting shmem large folio to avoid redundant split, since we can not write shmem folio to the swap device in this case. Signed-off-by: Baolin Wang --- mm/vmscan.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 1807e5d95dda..61465f92283f 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1237,6 +1237,14 @@ static unsigned int shrink_folio_list(struct list_he= ad *folio_list, } } else if (folio_test_swapbacked(folio) && folio_test_large(folio)) { + + /* + * Do not split shmem folio if no swap memory + * available. + */ + if (!total_swap_pages) + goto activate_locked; + /* Split shmem folio */ if (split_folio_to_list(folio, folio_list)) goto keep_locked; --=20 2.39.3