linux-kernel - Re: [PATCH 6/6] zram: export new 'mm

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Date:	Thu, 12 Mar 2015 10:54:11 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 6/6] zram: export new 'mm_stat' sysfs attrs

On (03/12/15 10:41), Minchan Kim wrote:
> Any user doesn't take care of document. I think we should add
> pr_warn_once to notify the user if he tried deprecated interface.

yes, that was something I didn't want to include into this patch.
I agree that some sort of a warning should go into the logs. do
you want me to add pr_warn_once() to every _show() function?

having this in documentation will not do any harm, so let's keep it
there as well.

> In addition, we should add deprecated interface in Documentation/ABI/obsolete/
> 

didn't know about that. ok, will send "deprecate old attrs" patch that will
add deprecated attrs to Documentation/ABI/obsolete/ and add pr_warn_once().


> > 
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> > ---
> >  Documentation/ABI/testing/sysfs-block-zram |  8 ++++++++
> >  Documentation/blockdev/zram.txt            | 18 +++++++++++++++++
> >  drivers/block/zram/zram_drv.c              | 31 ++++++++++++++++++++++++++++++
> >  3 files changed, 57 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
> > index a7f622f..8114c81 100644
> > --- a/Documentation/ABI/testing/sysfs-block-zram
> > +++ b/Documentation/ABI/testing/sysfs-block-zram
> > @@ -158,3 +158,11 @@ Description:
> >  		statistics not accounted by block layer. For example,
> >  		failed_reads, failed_writes, etc. File format is similar to
> >  		block layer statistics file format.
> > +
> > +What:		/sys/block/zram<id>/mm_stat
> > +Date:		August 2015
> > +Contact:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> > +Description:
> > +		The mm_stat file is read-only and accumulates device's mm
> > +		statistics (orig_data_size, compr_data_size, etc.) in a format
> 
> Every field in mm_stat doesn't mean accumulation.
> 

agree. bad wording. only num_migrated shows the accumulated number.
will send a trivial patch later.

	-ss
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