linux-kernel - RE: [PATCH 3/4] zsmalloc use zs

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Message-ID: <6a2c6de7-fc2f-4af7-9abd-da8698578f00@default>
Date:	Fri, 11 May 2012 09:31:53 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Konrad Wilk <konrad.wilk@...cle.com>,
	Nitin Gupta <ngupta@...are.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: RE: [PATCH 3/4] zsmalloc use zs_handle instead of void *

> From: Minchan Kim [mailto:minchan@...nel.org]
> Subject: Re: [PATCH 3/4] zsmalloc use zs_handle instead of void *
> 
> Hi Dan,
> 
> At least, zram is also primary user and it also has such mess although it's not severe than zcache.
> zram->table[index].handle sometime has real (void*) handle, sometime (struct page*).
> And I assume ramster you sent yesterday will be.
> 
> I think there are already many mess and I bet it will prevent going to mainline.
> Especially, handle problem is severe because it a arguement of most functions exported in zsmalloc
> So, we should clean up before late, IMHO.
> 
> > zcache is going to need more access to the internals
> > of its allocator, not less.  Zsmalloc is currently missing
> > some important functionality that (I believe) will be
> > necessary to turn zcache into an enterprise-ready,
> 
> If you have such TODO list, could you post it?
> It helps direction point of my stuff.

Will you be proposing to promote zram and zsmalloc out of staging
for the upcoming window?  If so, I will try to make some time
for this.  Otherwise, I apologize, but I will need to
wait a week or two (after the upcoming window) when I will
have more time.
 
> > always-on kernel feature.  If it evolves to add that
> > functionality, then it may no longer be able to provide
> > generic abstract access... in which case generic zsmalloc
> > may then have zero users in the kernel.
> 
> Hmm, Do you want to make zsmalloc by zcache owned private allocator?

I would prefer to use only zsmalloc, but it currently cannot provide
all the functionality of "zbud" which is a private allocator in
zcache and ramster.  I'll explain more later.

Dan
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