linux-kernel - Re: [PATCH 2/3] zsmalloc: add generic path and remove x86 dependency

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Date:	Thu, 28 Jun 2012 09:20:36 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>
Subject: Re: [PATCH 2/3] zsmalloc: add generic path and remove x86 dependency

On 06/28/2012 04:09 AM, Seth Jennings wrote:

> On 06/27/2012 12:28 AM, Minchan Kim wrote:
>>> +{
>>> +	if (area->vm)
>>> +		return 0;
>>
>>
>> Just out of curiosity.
>> When do we need above check?
> 
> I did this in the case that there was a race between the for
> loop in zs_init(), calling zs_cpu_notifier(), and a CPU
> coming online.  I've never seen the condition hit, but if it
> did, it would leak memory without this check.
> 


Could you add this as a comment?



> I would move the cpu notifier registration after the loop in
> zs_init(), but then I could miss a cpu up event and we
> wouldn't have the needed per-cpu resources for mapping.
> 
> All other suggestions are accepted.  Thanks for the feedback!
> 



Thanks!

-- 
Kind regards,
Minchan Kim
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