linux-kernel - Re: [PATCHv3 4/8] zram: use atomic64

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Message-ID: <20140117065411.GH26602@bbox>
Date:	Fri, 17 Jan 2014 15:54:11 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 4/8] zram: use atomic64_t for all zram stats

On Thu, Jan 16, 2014 at 04:12:12PM +0300, Sergey Senozhatsky wrote:
> This is a preparation patch for stats code duplication removal.
> 
> 1) use atomic64_t for `pages_zero' and `pages_stored' zram stats.
> 2) `compr_size' and `pages_zero' struct zram_stats members did not
> follow the existing device attr naming scheme: zram_stats.ATTR has
> ATTR_show() function. rename them:
> -- compr_size -> compr_data_size
> -- pages_zero -> zero_pages
> 
> Minchan Kim's note:
>  If we really have trouble with atomic stat operation, we could
>  change it with percpu_counter so that it could solve atomic overhead and
>  unnecessary memory space by introducing unsigned long instead of 64bit
>  atomic_t.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Acked-by: Minchan Kim <minchan@...nel.org>

-- 
Kind regards,
Minchan Kim
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