linux-kernel - Re: [PATCHv2 1/9] staging: zsmalloc: add gfp flags to zs_create

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Message-ID: <CAEwNFnDWpyvmN-fU=MczXKtcay6vMMCOOHUM2M09+wx7zOVxDQ@mail.gmail.com>
Date:	Fri, 25 Jan 2013 10:33:02 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv2 1/9] staging: zsmalloc: add gfp flags to zs_create_pool

Hi Seth, frontswap guys

On Tue, Jan 8, 2013 at 5:24 AM, Seth Jennings
<sjenning@...ux.vnet.ibm.com> wrote:
> zs_create_pool() currently takes a gfp flags argument
> that is used when growing the memory pool.  However
> it is not used in allocating the metadata for the pool
> itself.  That is currently hardcoded to GFP_KERNEL.
>
> zswap calls zs_create_pool() at swapon time which is done
> in atomic context, resulting in a "might sleep" warning.

I didn't review this all series, really sorry but totday I saw Nitin
added Acked-by so I'm afraid Greg might get it under my radar. I'm not
strong against but I would like know why we should call frontswap_init
under swap_lock? Is there special reason?

Thanks.
-- 
Kind regards,
Minchan Kim
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