linux-kernel - Re: [PATCHv3 6/8] zram: report failed read and write stats

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Date:	Tue, 4 Feb 2014 14:18:49 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 6/8] zram: report failed read and write stats

On Thu, 16 Jan 2014 16:12:14 +0300 Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> zram accounted but did not report numbers of failed read
> and write queries. make these stats available as failed_reads
> and failed_writes attrs.
> 
> Acked-by: Minchan Kim <minchan@...nel.org>
> Acked-by: Jerome Marchand <jmarchan@...hat.com>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> ---
>  drivers/block/zram/zram_drv.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index e7102f1..9d67fbf 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -728,6 +728,8 @@ static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL);
>  
>  ZRAM_ATTR_RO(num_reads);
>  ZRAM_ATTR_RO(num_writes);
> +ZRAM_ATTR_RO(failed_reads);
> +ZRAM_ATTR_RO(failed_writes);
>  ZRAM_ATTR_RO(invalid_io);
>  ZRAM_ATTR_RO(notify_free);
>  ZRAM_ATTR_RO(zero_pages);
> @@ -739,6 +741,8 @@ static struct attribute *zram_disk_attrs[] = {
>  	&dev_attr_reset.attr,
>  	&dev_attr_num_reads.attr,
>  	&dev_attr_num_writes.attr,
> +	&dev_attr_failed_reads.attr,
> +	&dev_attr_failed_writes.attr,
>  	&dev_attr_invalid_io.attr,
>  	&dev_attr_notify_free.attr,
>  	&dev_attr_zero_pages.attr,

Documentation/blockdev/zram.txt and
Documentation/ABI/testing/sysfs-block-zram need updating...

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