From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751834AbeCUEww (ORCPT <rfc822;w@1wt.eu>);
        Wed, 21 Mar 2018 00:52:52 -0400
Received: from mga12.intel.com ([192.55.52.136]:44193 "EHLO mga12.intel.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1751524AbeCUEws (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 21 Mar 2018 00:52:48 -0400
X-Amp-Result: UNKNOWN
X-Amp-Original-Verdict: FILE UNKNOWN
X-Amp-File-Uploaded: False
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.48,338,1517904000";
   d="scan'208";a="27098032"
Date: Wed, 21 Mar 2018 12:53:53 +0800
From: Aaron Lu <aaron.lu@intel.com>
To: "Figo.zhang" <figo1802@gmail.com>
Cc: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Huang Ying <ying.huang@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Kemi Wang <kemi.wang@intel.com>, Tim Chen <tim.c.chen@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>, Michal Hocko <mhocko@suse.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Matthew Wilcox <willy@infradead.org>,
        Daniel Jordan <daniel.m.jordan@oracle.com>
Subject: Re: [RFC PATCH v2 2/4] mm/__free_one_page: skip merge for order-0
 page unless compaction failed
Message-ID: <20180321045353.GC28705@intel.com>
References: <20180320085452.24641-1-aaron.lu@intel.com>
 <20180320085452.24641-3-aaron.lu@intel.com>
 <CAF7GXvovKsabDw88icK5c5xBqg6g0TomQdspfi4ikjtbg=XzGQ@mail.gmail.com>
 <20180321015944.GB28705@intel.com>
 <CAF7GXvrQG0+iPu8h13coo2QW7WxNhjHA1JAaOYoEBBB9-obRSQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAF7GXvrQG0+iPu8h13coo2QW7WxNhjHA1JAaOYoEBBB9-obRSQ@mail.gmail.com>
User-Agent: Mutt/1.9.2 (2017-12-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Mar 20, 2018 at 09:21:33PM -0700, Figo.zhang wrote:
> suppose that in free_one_page() will try to merge to high order anytime ,
> but now in your patch,
> those merge has postponed when system in low memory status, it is very easy
> let system trigger
> low memory state and get poor performance.

Merge or not merge, the size of free memory is not affected.