From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qe0-f51.google.com (mail-qe0-f51.google.com [209.85.128.51]) by kanga.kvack.org (Postfix) with ESMTP id EAE976B0035 for ; Mon, 6 Jan 2014 20:37:02 -0500 (EST) Received: by mail-qe0-f51.google.com with SMTP id 1so19772538qee.10 for ; Mon, 06 Jan 2014 17:37:02 -0800 (PST) Received: from mail-qe0-x22b.google.com (mail-qe0-x22b.google.com [2607:f8b0:400d:c02::22b]) by mx.google.com with ESMTPS id e9si26565910qar.4.2014.01.06.17.37.01 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 06 Jan 2014 17:37:01 -0800 (PST) Received: by mail-qe0-f43.google.com with SMTP id jy17so19018999qeb.16 for ; Mon, 06 Jan 2014 17:37:01 -0800 (PST) MIME-Version: 1.0 Date: Tue, 7 Jan 2014 09:37:01 +0800 Message-ID: Subject: [Help] Question about vm: fair zone allocator policy From: yvxiang Content-Type: multipart/alternative; boundary=047d7b6773a0b0e08104ef576934 Sender: owner-linux-mm@kvack.org List-ID: To: hannes@cmpxchg.org Cc: linux-mm@kvack.org --047d7b6773a0b0e08104ef576934 Content-Type: text/plain; charset=ISO-8859-1 Hi, Johannes I'm a new comer to vm. And I read your commit 81c0a2bb about fair zone allocator policy, but I don't quite understand your opinion, especially the words that "the allocator may keep kswapd running while kswapd reclaim ensures that the page allocator can keep allocating from the first zone in the zonelist for extended periods of time. " Could you or someone else explain me what does this mean in more details? Or could you give me a example? Thank you very much!! --047d7b6773a0b0e08104ef576934 Content-Type: text/html; charset=GB2312 Content-Transfer-Encoding: quoted-printable
Hi, Johannes 
&= nbsp;   
     I'm a= new comer to vm. And I read your commit 81c0a2bb abo= ut fair zone allocator policy,  but I don't quite understand your = opinion, especially the words that
 
   "= the allocator may keep kswapd running while kswapd reclaim=
    ensures that the page allocator can keep allocating = from the first zone in
    the zonelist for extend= ed periods of time. "

    Could you or someone else explai= n me what does this mean in more details? Or could you give me a example?

    Thank you very much!!
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