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 975BEC433EF for ; Wed, 22 Jun 2022 18:44:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 254018E00E3; Wed, 22 Jun 2022 14:44:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2044C8E00D8; Wed, 22 Jun 2022 14:44:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F3558E00E3; Wed, 22 Jun 2022 14:44:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 0087B8E00D8 for ; Wed, 22 Jun 2022 14:44:03 -0400 (EDT) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 777D832882 for ; Wed, 22 Jun 2022 18:44:03 +0000 (UTC) X-FDA: 79606746366.15.081E4FF Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf17.hostedemail.com (Postfix) with ESMTP id 06CCF40020 for ; Wed, 22 Jun 2022 18:43:57 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 86A0161D11; Wed, 22 Jun 2022 18:43:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A7C5C34114; Wed, 22 Jun 2022 18:43:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1655923422; bh=Ux1W9cg1dhtEDASKJfKm5SKzh2E5qU2cYOjw3eiFUCs=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=iMz57SoZVdJQToqzt3IjfIncs/MNYbCz1kh3QyZe96mFraFAl9VAR6LOiGsd8g9Mb MZ3V0rmu/vp9faUkXxxGihFcd4cu2VRoTsBZonETj5ha+6ys1+EMc5cZ2hjOjWb9yn Q26pRSfbuD6GYZDP5pSxfVRglPsPzDoAdOx826Vw= Date: Wed, 22 Jun 2022 11:43:28 -0700 From: Andrew Morton To: cgel.zte@gmail.com Cc: willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yang Yang Subject: Re: [PATCH] mm/page_alloc: make the annotations of available memory more accurate Message-Id: <20220622114328.938ef5b4899eb14cc8a285df@linux-foundation.org> In-Reply-To: <20220622064712.959479-1-yang.yang29@zte.com.cn> References: <20220622064712.959479-1-yang.yang29@zte.com.cn> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=iMz57SoZ; dmarc=none; spf=pass (imf17.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655923443; 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:dkim-signature; bh=kTewG7RkwjkzbrVvIFCw9U6vYBypbGvZmBvGVBkhkRY=; b=vh+det19XYZqe42k0aZjQ4HaPmhdjlWKER534hFKWozZxDkTcs4nr/79GakIb8WffKs8Dc sZHUkz5SJS4x5nFmaKajxnSdmTC20LugeD8FZHB2EyBcgqSoFnOMFgFprg8MvjRZFwsHnY qWEV2r6n02jikqBSON4qBYB9aBuTRPE= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655923443; a=rsa-sha256; cv=none; b=bB1dBOWfEqMynqqBBtIiAb0tpo/0peT9ZnHf2gzNS5rP2fUxamk2GO+KOD1iY4ZfaixMID /pWuPpnHBs+gBNZiPtdjh+baa/UNm0Woye5cI7tiI54tI+Q3IuUIl89T2+Ol2OnDL/gRcJ S8Usq7oLE1SOCatza6nJWMNQt69VzYU= X-Rspam-User: Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=iMz57SoZ; dmarc=none; spf=pass (imf17.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Stat-Signature: dqcxnhou66xwaoi1a11jg6yitq1m9nzd X-Rspamd-Queue-Id: 06CCF40020 X-Rspamd-Server: rspam12 X-HE-Tag: 1655923437-14622 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 Wed, 22 Jun 2022 06:47:13 +0000 cgel.zte@gmail.com wrote: > From: Yang Yang > > Not all the systems use swap, so estimating available memory would > help to prevent swapping or OOM of system that not use swap. > > And we need to reserve some page cache to prevent swapping or > thrashing. If somebody is accessing the pages in pagecache, > and if too much would be freed, most accesses might mean > reading data from disk, i.e. thrashing. > > Signed-off-by: Yang Yang This should include your signoff, as described in Documentation/process/submitting-patches.rst. And we'd like a full name for that signoff please, not simply a bare email address.