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Date:	Sat, 2 Nov 2013 00:40:48 -0700
From:	Stephen Barber <>
To:	Luigi Semenzato <>
Cc:	Olav Haugan <>, Bob Liu <>,
	Minchan Kim <>,
	Seth Jennings <>,,
Subject: Re: zram/zsmalloc issues in very low memory conditions

I did get zswap working without a backing store, using Bob's patches
applied to 3.11-rc6, The major issue we had with it was that i915
graphics buffers were getting corrupted somehow, which wasn't a
problem with zram on the same kernel version. I'm sure with a little
more investigation that problem could be fixed, though, and I don't
think there were any other major problems with it in our (admittedly
not very exhaustive) testing of those patches.

Hope that helps,
Steve Barber

On Thu, Oct 31, 2013 at 5:27 PM, Luigi Semenzato <> wrote:
> [apologies for the previous HTML email]
> Hi Olav,
> I haven't personally done it.  Seth outlines the configuration in this thread:
> Stephen, can you add more detail from your experience?
> Thanks!
> 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
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