From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 638EBE77173 for ; Mon, 9 Dec 2024 06:43:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8F2E38D0015; Mon, 9 Dec 2024 01:43:17 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 82F576B0134; Mon, 9 Dec 2024 01:43:17 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6A8CC8D0015; Mon, 9 Dec 2024 01:43:17 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 39C796B03C7 for ; Mon, 9 Dec 2024 01:43:17 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id BA4BB1A01ED for ; Mon, 9 Dec 2024 06:43:16 +0000 (UTC) X-FDA: 82874478162.23.06EECD9 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by imf28.hostedemail.com (Postfix) with ESMTP id 5B49BC000C for ; Mon, 9 Dec 2024 06:42:49 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf28.hostedemail.com: domain of tujinjiang@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=tujinjiang@huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1733726574; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CqQQ8boZa5cGky1L5RbGp8r1ztjaPswdHNXV+u/WgMY=; b=YfOa5ITU4d8zgq7xmM28g4IOEwnmw96EyZh3Zfa+L7hbVYY1KDMwgEOkSls4HZ58s5Gqf0 crI6QIpiW7ljKo4n9SN79ukKXt7bAE8xY9AmKnvKpHztNjNz5Mreo76uyVzoswIvzanG8d lWuL7QunlBt5ZRlt2Yfcqi0ZEi4UF8I= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1733726574; a=rsa-sha256; cv=none; b=VJHX5hXMpa0oX0J5CfoZjTZL/YBgl+AxkHt/qDPiPPZcIXorW1mRwIk4nB0y9y+PpTD3rF hjjhMmrhSY9UcuU7/Ykr6ySJbKDcfzpv8pI97n2K2yshaGSBAjz8QfKjKst+KVppHQ2sek xRDBaDzFvCuC/4m6MS/9URjSq9I+H+c= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf28.hostedemail.com: domain of tujinjiang@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=tujinjiang@huawei.com Received: from mail.maildlp.com (unknown [172.19.163.174]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Y6C0Q50HWz11MBq; Mon, 9 Dec 2024 14:40:06 +0800 (CST) Received: from dggpeml500011.china.huawei.com (unknown [7.185.36.84]) by mail.maildlp.com (Postfix) with ESMTPS id C45681401E0; Mon, 9 Dec 2024 14:43:09 +0800 (CST) Received: from [10.174.179.13] (10.174.179.13) by dggpeml500011.china.huawei.com (7.185.36.84) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Mon, 9 Dec 2024 14:43:09 +0800 Message-ID: <4a8e2901-12b3-b700-383c-3193adc0ed60@huawei.com> Date: Mon, 9 Dec 2024 14:43:08 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.11.2 Subject: Re: [PATCH -next] ovl: respect underlying filesystem's get_unmapped_area() To: Matthew Wilcox CC: , , , , , , , , , , , References: <20241205143038.3260233-1-tujinjiang@huawei.com> From: Jinjiang Tu In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.179.13] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpeml500011.china.huawei.com (7.185.36.84) X-Rspamd-Queue-Id: 5B49BC000C X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: j4n69ijaar83refqwei6isf9sa56isys X-HE-Tag: 1733726569-440489 X-HE-Meta: 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 YPIF+aHz zS0ka61kBLexcXDzKqUCyeKR9tuPxcmMKhiKL2XjLR3BOGlIGN6d6dgjwyV8bd+NBx0bVC7SU6LC24qSvJs+Qa13iextlplbsXa2j8Dj7+UkNRIkVb8gWKH7U3OmSUO180m4C8Zzy6sS6i8FE2UwYkMZtrzOkID9CBR5+Uf9W4oN5IOUfY2p8rfDKoYwGa2GJxaperAOb+diftCU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 在 2024/12/6 21:58, Matthew Wilcox 写道: > On Thu, Dec 05, 2024 at 10:30:38PM +0800, Jinjiang Tu wrote: >> During our tests in containers, there is a read-only file (i.e., shared > Show your test. I mmap an overlayfs file with PROT_READ, and call madvise(MADV_COLLAPSE), the code is as follows: fd = open(path, O_RDONLY); addr = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); ret = madvise(addr, size, MADV_COLLAPSE); The addr isn't THP-aligned and ret is -1, errno is EINVAL. >