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From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Konrad Wilk <konrad.wilk@oracle.com>,
	Minchan Kim <minchan@kernel.org>, Bob Liu <bob.liu@oracle.com>,
	Robert Jennings <rcj@linux.vnet.ibm.com>,
	Nitin Gupta <ngupta@vflare.org>,
	Wanpeng Li <liwanp@linux.vnet.ibm.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: zsmalloc zbud hybrid design discussion?
Date: Thu, 11 Apr 2013 15:10:02 -0500	[thread overview]
Message-ID: <20130411201002.GD28296@cerebellum> (raw)
In-Reply-To: <20130411193534.GB28296@cerebellum>

On Thu, Apr 11, 2013 at 02:35:34PM -0500, Seth Jennings wrote:
> Not a requirement:
> 
> Compaction - compaction would basically involve creating a virtual address
> space of sorts, which zsmalloc is capable of through its API with handles,
> not pointer.  However, as Dan points out this requires a structure the maintain
> the mappings and adds to complexity.  Additionally, the need for compaction
> diminishes as the allocations are short-lived with frontswap backends doing
> writeback and cleancache backends shrinking.

Of course I say this, but for zram, this can be important as the allocations
can't be moved out of memory and, therefore, are long lived.  I was speaking
from the zswap perspective.

Thanks,
Seth

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WARNING: multiple messages have this Message-ID (diff)
From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Konrad Wilk <konrad.wilk@oracle.com>,
	Minchan Kim <minchan@kernel.org>, Bob Liu <bob.liu@oracle.com>,
	Robert Jennings <rcj@linux.vnet.ibm.com>,
	Nitin Gupta <ngupta@vflare.org>,
	Wanpeng Li <liwanp@linux.vnet.ibm.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: zsmalloc zbud hybrid design discussion?
Date: Thu, 11 Apr 2013 15:10:02 -0500	[thread overview]
Message-ID: <20130411201002.GD28296@cerebellum> (raw)
In-Reply-To: <20130411193534.GB28296@cerebellum>

On Thu, Apr 11, 2013 at 02:35:34PM -0500, Seth Jennings wrote:
> Not a requirement:
> 
> Compaction - compaction would basically involve creating a virtual address
> space of sorts, which zsmalloc is capable of through its API with handles,
> not pointer.  However, as Dan points out this requires a structure the maintain
> the mappings and adds to complexity.  Additionally, the need for compaction
> diminishes as the allocations are short-lived with frontswap backends doing
> writeback and cleancache backends shrinking.

Of course I say this, but for zram, this can be important as the allocations
can't be moved out of memory and, therefore, are long lived.  I was speaking
from the zswap perspective.

Thanks,
Seth


  reply	other threads:[~2013-04-11 20:10 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-27 20:04 zsmalloc zbud hybrid design discussion? Dan Magenheimer
2013-03-27 20:04 ` Dan Magenheimer
2013-03-28  4:30 ` Bob Liu
2013-03-28  4:30   ` Bob Liu
2013-04-11 19:35 ` Seth Jennings
2013-04-11 19:35   ` Seth Jennings
2013-04-11 20:10   ` Seth Jennings [this message]
2013-04-11 20:10     ` Seth Jennings
2013-04-11 23:28   ` Dan Magenheimer
2013-04-11 23:28     ` Dan Magenheimer
2013-04-12 20:15     ` Seth Jennings
2013-04-12 20:15       ` Seth Jennings
2013-04-12 20:48       ` Dan Magenheimer
2013-04-12 20:48         ` Dan Magenheimer

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