From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-doc-owner@kernel.org>
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=-5.2 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,
	USER_AGENT_SANE_1 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 BEFA1C433E0
	for <linux-doc@archiver.kernel.org>; Mon, 21 Dec 2020 14:15:01 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id 8524522BEA
	for <linux-doc@archiver.kernel.org>; Mon, 21 Dec 2020 14:15:01 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727046AbgLUOPB (ORCPT <rfc822;linux-doc@archiver.kernel.org>);
        Mon, 21 Dec 2020 09:15:01 -0500
Received: from mx2.suse.de ([195.135.220.15]:40200 "EHLO mx2.suse.de"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1726921AbgLUOPA (ORCPT <rfc822;linux-doc@vger.kernel.org>);
        Mon, 21 Dec 2020 09:15:00 -0500
X-Virus-Scanned: by amavisd-new at test-mx.suse.de
Received: from relay2.suse.de (unknown [195.135.221.27])
        by mx2.suse.de (Postfix) with ESMTP id 3CA14AC63;
        Mon, 21 Dec 2020 14:14:19 +0000 (UTC)
Date:   Mon, 21 Dec 2020 15:14:14 +0100
From:   Oscar Salvador <osalvador@suse.de>
To:     Muchun Song <songmuchun@bytedance.com>
Cc:     Jonathan Corbet <corbet@lwn.net>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Thomas Gleixner <tglx@linutronix.de>, mingo@redhat.com,
        bp@alien8.de, x86@kernel.org, hpa@zytor.com,
        dave.hansen@linux.intel.com, luto@kernel.org,
        Peter Zijlstra <peterz@infradead.org>, viro@zeniv.linux.org.uk,
        Andrew Morton <akpm@linux-foundation.org>, paulmck@kernel.org,
        mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
        Randy Dunlap <rdunlap@infradead.org>, oneukum@suse.com,
        anshuman.khandual@arm.com, jroedel@suse.de,
        Mina Almasry <almasrymina@google.com>,
        David Rientjes <rientjes@google.com>,
        Matthew Wilcox <willy@infradead.org>,
        Michal Hocko <mhocko@suse.com>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
        David Hildenbrand <david@redhat.com>, naoya.horiguchi@nec.com,
        Xiongchun duan <duanxiongchun@bytedance.com>,
        linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [External] Re: [PATCH v10 04/11] mm/hugetlb: Defer freeing of
 HugeTLB pages
Message-ID: <20201221141242.GA19680@linux>
References: <20201217121303.13386-1-songmuchun@bytedance.com>
 <20201217121303.13386-5-songmuchun@bytedance.com>
 <20201221102703.GA15804@linux>
 <CAMZfGtW0jzNchLqieAudyk4TsaAUtYEdoC=j+gkkVLJBaKg3pA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAMZfGtW0jzNchLqieAudyk4TsaAUtYEdoC=j+gkkVLJBaKg3pA@mail.gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk
List-ID: <linux-doc.vger.kernel.org>
X-Mailing-List: linux-doc@vger.kernel.org

On Mon, Dec 21, 2020 at 07:07:18PM +0800, Muchun Song wrote:
> > The above implies that update_and_free_page() is __always__ called from a
> > non-task context, but that is not always the case?
> 
> IIUC, here is always the case.

I might be missing something obvious, so bear with me.

I guess you are refering to the call __free_huge_page()->update_and_free_page().
AFAICS, free_huge_page might call __free_huge_page right away when in task
context, and so, we would be calling update_and_free in a task context as well.

Or are you referring to the other callers?

-- 
Oscar Salvador
SUSE L3