linux-kernel - Re: what's cooking in zram for 4.1

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Message-ID: <20150518093645.GL4834@ws.net.home>
Date:	Mon, 18 May 2015 11:36:45 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, util-linux@...r.kernel.org
Subject: Re: what's cooking in zram for 4.1

On Sat, May 09, 2015 at 01:21:48PM +0900, Sergey Senozhatsky wrote:
> There will be some user-space visible changes in zram 4.1 we'd love to let you know
> about.

...

> -- /sys/block/zram<id>/mm_stat
> 
> The stat file represents device's mm statistics. It consists of a single
> line of text and contains the following stats separated by whitespace:
>         orig_data_size
>         compr_data_size
>         mem_used_total
>         mem_limit
>         mem_used_max
>         zero_pages
>         num_migrated

OK, zramctl(8) code in util-linux git tree supports mm_stat file now.
It's able to fallback to the original /sys/block/zram<id>/<attr> if
mm_stat does not exist. The change will be available in v2.27 (~Aug 2015).

I have also added support for MEM-LIMIT, MEM-USED and MIGRATED columns.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com
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