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 X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AABB6C4363A for ; Mon, 26 Oct 2020 15:54:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id AFDAF22400 for ; Mon, 26 Oct 2020 15:54:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="rJeT0U00" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AFDAF22400 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C90176B005D; Mon, 26 Oct 2020 11:54:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C406D6B0062; Mon, 26 Oct 2020 11:54:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B56476B0068; Mon, 26 Oct 2020 11:54:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0109.hostedemail.com [216.40.44.109]) by kanga.kvack.org (Postfix) with ESMTP id 85DC96B005D for ; Mon, 26 Oct 2020 11:54:30 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 26F1582499A8 for ; Mon, 26 Oct 2020 15:54:30 +0000 (UTC) X-FDA: 77414523900.20.form83_1713f7627274 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id EB60B180C07AF for ; Mon, 26 Oct 2020 15:54:29 +0000 (UTC) X-HE-Tag: form83_1713f7627274 X-Filterd-Recvd-Size: 2353 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Mon, 26 Oct 2020 15:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=vyhHgvG7q8mR9uMvZeYLk5NHZwVRptJfoJ1pJf94u/w=; b=rJeT0U00ikfNjcJQtqCRsa7hOt ivtgVTTtgl9kExGOJKtB+fnr1jwocDyAMRTBrHLj3PqfTPNX9b98nvCY9DAgh3rLcYZeexA4/ZqfY 3mlAR//t9KiagQl4WI6SHv+024l4eQ1sZxbXYxTUDArjJzaqnvuRblbwfVKGWkKZ/lPnGNER597k/ eJ39O0iHRxpCkmutShHNp12crRXubSmEg1dVWZk+zttJM00+w9do7Y32oOG0U0f9X9MjJR8OFmSZS oa0m8qgXc2SzfJIB+ciMuBL8b8JOGt+3bv0/n0M9GJkGXY23IcT8PIvaRjbA+pCUTTGQmIDD4CmVq r3ISWBeA==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kX4oh-0008HP-62; Mon, 26 Oct 2020 15:53:51 +0000 Date: Mon, 26 Oct 2020 15:53:51 +0000 From: Matthew Wilcox To: Muchun Song Cc: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 00/19] Free some vmemmap pages of hugetlb page Message-ID: <20201026155351.GS20115@casper.infradead.org> References: <20201026145114.59424-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201026145114.59424-1-songmuchun@bytedance.com> 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: On Mon, Oct 26, 2020 at 10:50:55PM +0800, Muchun Song wrote: > For tail pages, the value of compound_dtor is the same. So we can reuse compound_dtor is only set on the first tail page. compound_head is what you mean here, I think.