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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 E2B41C433E0 for ; Mon, 4 Jan 2021 12:55:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 59AEF21BE5 for ; Mon, 4 Jan 2021 12:55:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 59AEF21BE5 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7A6068D000E; Mon, 4 Jan 2021 07:55:58 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 756878D000A; Mon, 4 Jan 2021 07:55:58 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6937C8D000E; Mon, 4 Jan 2021 07:55:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0034.hostedemail.com [216.40.44.34]) by kanga.kvack.org (Postfix) with ESMTP id 53B7B8D000A for ; Mon, 4 Jan 2021 07:55:58 -0500 (EST) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1ACE8180AD804 for ; Mon, 4 Jan 2021 12:55:58 +0000 (UTC) X-FDA: 77668089996.11.power63_4c08149274d0 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin11.hostedemail.com (Postfix) with ESMTP id E953B180F8B80 for ; Mon, 4 Jan 2021 12:55:57 +0000 (UTC) X-HE-Tag: power63_4c08149274d0 X-Filterd-Recvd-Size: 2397 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Mon, 4 Jan 2021 12:55:57 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1609764956; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=msIW88wK00DoAnz9CIDN560ghwz+bPy+u/wMPHdrQPA=; b=JccxXLpGBLoGDL28F8aGR/x0pglghkevXPipC+8umQI1PkJEXYxdzOYoAjVCActmCw3KDG wAg4gMgIhGwbNtAqqTo/lYC00eLNaTb5SUafFV0fKu4BpLjNRl3GpenCkL4mw9kVGUcc0e HQMsEDaQVMonsKFIqbcJLa5S7u/N7xU= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4ED38AFEF; Mon, 4 Jan 2021 12:55:56 +0000 (UTC) Date: Mon, 4 Jan 2021 13:55:54 +0100 From: Michal Hocko To: Liang Li Cc: Alexander Duyck , Mel Gorman , Andrew Morton , Andrea Arcangeli , Dan Williams , "Michael S. Tsirkin" , David Hildenbrand , Jason Wang , Dave Hansen , Liang Li , linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: [RFC v2 PATCH 0/4] speed up page allocation for __GFP_ZERO Message-ID: <20210104125554.GE13207@dhcp22.suse.cz> References: <20201221162519.GA22504@open-light-1.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201221162519.GA22504@open-light-1.localdomain> 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 21-12-20 11:25:22, Liang Li wrote: [...] > Security > ======== > This is a weak version of "introduce init_on_alloc=1 and init_on_free=1 > boot options", which zero out page in a asynchronous way. For users can't > tolerate the impaction of 'init_on_alloc=1' or 'init_on_free=1' brings, > this feauture provide another choice. Most of the usecases are about the start up time imporvemtns IIUC. Have you tried to use init_on_free or this would be prohibitive for your workloads? -- Michal Hocko SUSE Labs