linux-kernel - Re: [PATCH v2] mm/zsmalloc: add statistics support

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Message-ID: <20141220002303.GD11975@blaptop>
Date:	Sat, 20 Dec 2014 09:23:03 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ganesh Mahendran <opensource.ganesh@...il.com>, ngupta@...are.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/zsmalloc: add statistics support

On Fri, Dec 19, 2014 at 04:17:56PM -0800, Andrew Morton wrote:
> On Sat, 20 Dec 2014 09:10:43 +0900 Minchan Kim <minchan@...nel.org> wrote:
> 
> > > It involves rehashing a lengthy argument with Greg.
> > 
> > Okay. Then, Ganesh,
> > please add warn message about duplicaed name possibility althoug
> > it's unlikely as it is.
> 
> Oh, getting EEXIST is easy with this patch.  Just create and destroy a
> pool 2^32 times and the counter wraps ;) It's hardly a serious issue
> for a debugging patch.

I meant that I wanted to change from index to name passed from caller like this

zram:
	zs_create_pool(GFP_NOIO | __GFP_HIGHMEM, zram->disk->first_minor);

So, duplication should be rare. :)
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