From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f42.google.com (mail-pa0-f42.google.com [209.85.220.42]) by kanga.kvack.org (Postfix) with ESMTP id 2CE3F6B0036 for ; Thu, 31 Oct 2013 20:25:28 -0400 (EDT) Received: by mail-pa0-f42.google.com with SMTP id kp14so3316219pab.1 for ; Thu, 31 Oct 2013 17:25:27 -0700 (PDT) Received: from psmtp.com ([74.125.245.138]) by mx.google.com with SMTP id mj9si3478562pab.335.2013.10.31.17.25.26 for ; Thu, 31 Oct 2013 17:25:27 -0700 (PDT) Received: by mail-ie0-f177.google.com with SMTP id e14so6178582iej.22 for ; Thu, 31 Oct 2013 17:25:25 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <5272E8EB.5030900@codeaurora.org> References: <526844E6.1080307@codeaurora.org> <52686FF4.5000303@oracle.com> <5269BCCC.6090509@codeaurora.org> <5272E8EB.5030900@codeaurora.org> Date: Thu, 31 Oct 2013 17:25:25 -0700 Message-ID: Subject: Re: zram/zsmalloc issues in very low memory conditions From: Luigi Semenzato Content-Type: multipart/alternative; boundary=047d7bdc10ec44951604ea129aa3 Sender: owner-linux-mm@kvack.org List-ID: To: Olav Haugan , Stephen Barber Cc: Bob Liu , Minchan Kim , Seth Jennings , linux-kernel@vger.kernel.org, linux-mm@kvack.org --047d7bdc10ec44951604ea129aa3 Content-Type: text/plain; charset=ISO-8859-1 Hi Olav, I haven't personally done it. Seth outlines the configuration in this thread: http://thread.gmane.org/gmane.linux.kernel.mm/105378/focus=105543 Stephen, can you add more detail from your experience? Thanks! Luigi On Thu, Oct 31, 2013 at 4:34 PM, Olav Haugan wrote: > Hi Luigi, > > On 10/24/2013 6:12 PM, Luigi Semenzato wrote: > > On Thu, Oct 24, 2013 at 5:35 PM, Olav Haugan > wrote: > >> Hi Bob, Luigi, > >> > >> On 10/23/2013 5:55 PM, Bob Liu wrote: > >>> > >>> On 10/24/2013 05:51 AM, Olav Haugan wrote: > >> > >>> By the way, could you take a try with zswap? Which can write pages to > >>> real swap device if compressed pool is full. > >> > >> zswap might not be feasible in all cases if you only have flash as > >> backing storage. > > > > Zswap can be configured to run without a backing storage. > > > > I was under the impression that zswap requires a backing storage. Can > you elaborate on how to configure zswap to not need a backing storage? > > > Olav Haugan > > -- > The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, > hosted by The Linux Foundation > --047d7bdc10ec44951604ea129aa3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Olav,

I haven't perso= nally done it. =A0Seth outlines the configuration in this thread:

http://thread.gmane.org/gmane.linux.kernel.mm/105378/focus= =3D105543

Stephen, can you add more detail from your experience?<= /div>

Thanks!
Luigi

<= br>


On Thu, Oct 31, 2013 at 4:34 PM, Olav Haugan <ohaugan@codeaurora.org= > wrote:
Hi Luigi,

On 10/24/2013 6:12 PM, Luigi Semenzato wrote:
> On Thu, Oct 24, 2013 at 5:35 PM, Olav Haugan <ohaugan@codeaurora.org> wrote:
>> Hi Bob, Luigi,
>>
>> On 10/23/2013 5:55 PM, Bob Liu wrote:
>>>
>>> On 10/24/2013 05:51 AM, Olav Haugan wrote:
>>
>>> By the way, could you take a try with = zswap? Which can write pages to
>>> real swap device if compressed pool is full.
>>
>> zswap might not be feasible in all cases if you only have flash as=
>> backing storage.
>
> Zswap can be configured to run without a backing storage.
>

I was under the impression that zswap requires a backing storage. Can=
you elaborate on how to configure zswap to not need a backing storage?


Olav Haugan

--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

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