Message-ID: <527CC072.1000200@oracle.com>
Date:	Fri, 08 Nov 2013 18:44:02 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>, lliubbo@...il.com,
	jmarchan@...hat.com, mgorman@...e.de, riel@...hat.com,
	hughd@...gle.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: zsmalloc: Ensure handle is never 0 on success

On 11/07/2013 03:04 PM, Minchan Kim wrote:
> On Wed, Nov 06, 2013 at 07:05:11PM -0800, Greg KH wrote:
>> On Wed, Nov 06, 2013 at 03:46:19PM -0800, Nitin Gupta wrote:
>>  > I'm getting really tired of them hanging around in here for many years
>>>> now...
>>>>
>>>
>>> Minchan has tried many times to promote zram out of staging. This was
>>> his most recent attempt:
>>>
>>> https://lkml.org/lkml/2013/8/21/54
>>>
>>> There he provided arguments for zram inclusion, how it can help in
>>> situations where zswap can't and why generalizing /dev/ramX would
>>> not be a great idea. So, cannot say why it wasn't picked up
>>> for inclusion at that time.
>>>
>>>> Should I just remove them if no one is working on getting them merged
>>>> "properly"?
>>>>
>>>
>>> Please refer the mail thread (link above) and see Minchan's
>>> justifications for zram.
>>> If they don't sound convincing enough then please remove zram+zsmalloc
>>> from staging.
>>
>> You don't need to be convincing me, you need to be convincing the
>> maintainers of the area of the kernel you are working with.
>>
>> And since the last time you all tried to get this merged was back in
>> August, I'm feeling that you all have given up, so it needs to be
>> deleted.  I'll go do that for 3.14, and if someone wants to pick it up
>> and merge it properly, they can easily revert it.
> 
> I'm guilty and I have been busy by other stuff. Sorry for that.
> Fortunately, I discussed this issue with Hugh in this Linuxcon for a
> long time(Thanks Hugh!) he felt zram's block device abstraction is
> better design rather than frontswap backend stuff although it's a question
> where we put zsmalloc. I will CC Hugh because many of things is related
> to swap subsystem and his opinion is really important.
> And I discussed it with Rik and he feel positive about zram.
> 
> Last impression Andrw gave me by private mail is he want to merge
> zram's functionality into zswap or vise versa.
> If I misunderstood, please correct me.
> I understand his concern but I guess he didn't have a time to read
> my long description due to a ton of works at that time.
> So, I will try one more time.
> I hope I'd like to listen feedback than *silence* so that we can
> move forward than stall.
> 
> Recently, Bob tried to move zsmalloc under mm directory to unify
> zram and zswap with adding pseudo block device in zswap(It's
> very weired to me. I think it's horrible monster which is lying
> between mm and block in layering POV) but he was ignoring zram's
> block device (a.k.a zram-blk) feature and considered only swap
> usecase of zram, in turn, it lose zram's good concept. 
> I already convered other topics Bob raised in this thread[1]
> and why I think zram is better in the thread.
> 

I have no objections for zram, and I also think is good for zswap can
support zsmalloc and fake swap device. At least users can have more
options just like slab/slub/slob.

-- 
Regards,
-Bob
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