linux-kernel - Re: Query of zram/zsmalloc promotion

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Message-ID: <20120921164112.GD4780@phenom.dumpdata.com>
Date:	Fri, 21 Sep 2012 12:41:13 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Nitin Gupta <ngupta@...are.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Query of zram/zsmalloc promotion

On Wed, Sep 12, 2012 at 11:39:14AM +0900, Minchan Kim wrote:
> Hi all,
> 
> I would like to promote zram/zsmalloc from staging tree.
> I already tried it https://lkml.org/lkml/2012/8/8/37 but I didn't get
> any response from you guys.
> 
> I think zram/zsmalloc's code qulity is good and they
> are used for many embedded vendors for a long time.
> So it's proper time to promote them.
> 
> The zram should put on under driver/block/. I think it's not
> arguable but the issue is which directory we should keep *zsmalloc*.
> 
> Now Nitin want to keep it with zram so it would be in driver/blocks/zram/
> But I don't like it because zsmalloc touches several fields of struct page
> freely(and AFAIRC, Andrew had a same concern with me) so I want to put
> it under mm/.

I like the idea of keeping it in /lib or /mm. Actually 'lib' sounds more
appropriate since it is dealing with storing a bunch of pages in a nice
layout for great density purposes.
> 
> In addtion, now zcache use it, too so it's rather awkward if we put it
> under dirver/blocks/zram/.
> 
> So questions.
> 
> To Andrew:
> Is it okay to put it under mm/ ? Or /lib?
> 
> To Jens:
> Is it okay to put zram under drvier/block/ If you are okay, I will start sending
> patchset after I sort out zsmalloc's location issue.

I would think it would be OK.
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> --
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