linux-kernel - Re: [PATCH 1/3] zsmalloc: promote to lib/

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Date:	Thu, 27 Sep 2012 10:39:12 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] zsmalloc: promote to lib/

Hi Pekka,

On Wed, Sep 26, 2012 at 12:51:49PM +0300, Pekka Enberg wrote:
> On Wed, Sep 26, 2012 at 11:50 AM, Minchan Kim <minchan@...nel.org> wrote:
> >  lib/Kconfig                              |    2 +
> >  lib/Makefile                             |    1 +
> >  lib/zsmalloc/Kconfig                     |   18 +
> >  lib/zsmalloc/Makefile                    |    1 +
> >  lib/zsmalloc/zsmalloc.c                  | 1064 ++++++++++++++++++++++++++++++
> 
> What's wrong with mm/zsmalloc.c?

Why I put zsmalloc into under mm firstly is that Andrew had a concern
about using strut page's some fields freely in zsmalloc so he wanted
to maintain it in mm/ if I remember correctly.

So I and Nitin tried to ask the opinion to akpm several times
(at least 5 and even I sent such patch a few month ago) but didn't get
any reply from him so I guess he doesn't have any concern about that
any more.

In point of view that it's an another slab-like allocator,
it might be proper under mm but it's not popular as current mm's 
allocators(/SLUB/SLOB and page allocator).

Frankly speaking, I'm okay whether we put it to mm/ or lib/.
But it seems Nitin and Konrad like lib/ and Andrew is silent.
That's why I am biased into lib/ now.

If someone yell we should keep it to mm/ by logical claim,
I can change my mind easily.
But I've never heard abut that until now.

> 
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-- 
Kind regards,
Minchan Kim
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