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From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Nitin Gupta <ngupta@vflare.org>,
	linux-kernel@vger.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [PATCH 0/6] new zram statistics reporting scheme
Date: Thu, 12 Mar 2015 11:16:09 +0900	[thread overview]
Message-ID: <20150312021609.GA3508@swordfish> (raw)
In-Reply-To: <20150312015558.GG10820@blaptop>

On (03/12/15 10:55), Minchan Kim wrote:
> I really appreciate you enhance stat functions, esp, working with iostat!

thanks! my pleasure.

> One thing I want to discuss is sometime we could remove RO fields
> in /sys/block/zram/ but we couldn't remove RW fields because
> io_stat/mm_stat doesn't have any writable option now so users will
> have two options to read stat. For exmaple,

I played with CONFIG_ZRAM_OLD_STATS option, which turns RW attrs into
WO attrs (where possible/needed). but it turned out to be a rather
ugly patch and I eventually decided that I don't want to have these
#ifdef-s in zram code for the next two years. so providing both RW/RO
old stats (with a warning in the logs) and RO [mm|io]_stat sound like
a better plan.

>         cat /sys/block/zram/mem_used_max
>         cat /sys/block/zram/mm_stat | awk friend
> 
> How about changing only writeable, not readable for duplicated stats
> in /sys/block/zram? So, user will have writeable stat to set some
> options in /sys/block/zram and readable stat to get some data in
> /sys/block/zram/[io|mm]_stat if the stat is duplicated in both.

Sorry, I probably didn't drink enough coffee today, can you please
rephrase or give a trivial example?

		-ss

  reply	other threads:[~2015-03-12  2:16 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-10 15:08 Sergey Senozhatsky
2015-03-10 15:08 ` [PATCH 1/6] zram: remove `num_migrated' device attr Sergey Senozhatsky
2015-03-12  1:16   ` Minchan Kim
2015-03-12  1:22     ` Sergey Senozhatsky
2015-03-10 15:08 ` [PATCH 2/6] zram: move compact_store() to sysfs functions area Sergey Senozhatsky
2015-03-12  1:24   ` Minchan Kim
2015-03-10 15:08 ` [PATCH 3/6] zram: use generic start/end io accounting Sergey Senozhatsky
2015-03-12  1:25   ` Minchan Kim
2015-03-10 15:08 ` [PATCH 4/6] zram: describe device attrs in documentation Sergey Senozhatsky
2015-03-12  1:33   ` Minchan Kim
2015-03-12  1:47     ` Sergey Senozhatsky
2015-03-10 15:08 ` [PATCH 5/6] zram: export new 'io_stat' sysfs attrs Sergey Senozhatsky
2015-03-12  1:36   ` Minchan Kim
2015-03-10 15:08 ` [PATCH 6/6] zram: export new 'mm_stat' " Sergey Senozhatsky
2015-03-12  1:41   ` Minchan Kim
2015-03-12  1:54     ` Sergey Senozhatsky
2015-03-12  1:55 ` [PATCH 0/6] new zram statistics reporting scheme Minchan Kim
2015-03-12  2:16   ` Sergey Senozhatsky [this message]
2015-03-12  5:03     ` Sergey Senozhatsky
2015-03-12  5:11     ` Minchan Kim
2015-03-12  5:24       ` Sergey Senozhatsky

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