linux-kernel - Re: [PATCH] staging: zsmalloc: fix memory leak

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Message-ID: <4F83454A.3050007@linux.vnet.ibm.com>
Date:	Mon, 09 Apr 2012 15:23:38 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] staging: zsmalloc: fix memory leak

Hey Greg,

Haven't heard back from you on this patch and it needs to
get into the 3.4 -rc releases ASAP.  It fixes a substantial
memory leak when frontswap/zcache are enabled.

Let me know if you need me to repost.

The patch was sent on 4/2.

Thanks,
Seth

On 04/04/2012 11:26 AM, Seth Jennings wrote:
> On 04/04/2012 11:03 AM, Dan Magenheimer wrote:
>>> From: Seth Jennings [mailto:sjenning@...ux.vnet.ibm.com]
>>> Sent: Monday, April 02, 2012 8:14 AM
>>> To: Greg Kroah-Hartman
>>> Cc: Nitin Gupta; Dan Magenheimer; Konrad Rzeszutek Wilk; Robert Jennings; Seth Jennings;
>>> devel@...verdev.osuosl.org; linux-kernel@...r.kernel.org; linux-mm@...ck.org
>>> Subject: [PATCH] staging: zsmalloc: fix memory leak
>>>
>>> From: Nitin Gupta <ngupta@...are.org>
>>>
>>> This patch fixes a memory leak in zsmalloc where the first
>>> subpage of each zspage is leaked when the zspage is freed.
>>>
>>> Based on 3.4-rc1.
>>>
>>> Signed-off-by: Nitin Gupta <ngupta@...are.org>
>>> Acked-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
>>
>> This is a rather severe memory leak and will affect most
>> benchmarking anyone does to evaluate zcache in 3.4 (e.g. as
>> to whether zcache is suitable for promotion), so t'would be nice
>> to get this patch in for -rc2.  (Note it fixes a "regression"
>> since it affects zcache only in 3.4+ because the fix is to
>> the new zsmalloc allocator... so no change to stable trees.)
>>
>> Acked-by: Dan Magenheimer <dan.magenheimer@...cle.com>
> 
> Thanks Dan for this clarification and the Ack.
> 
> I should have tagged this as urgent for the 3.4 release
> and no impact on stable trees, since 3.4 is the first release
> with this code.
> 
> --
> Seth

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