linux-kernel - Re: [PATCH 3/5] writeback: nr_dirtied and nr

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Date:	Mon, 13 Sep 2010 15:17:36 -0700
From:	Michael Rubin <mrubin@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, fengguang.wu@...el.com, jack@...e.cz,
	riel@...hat.com, david@...morbit.com,
	kosaki.motohiro@...fujitsu.com, npiggin@...nel.dk, hch@....de,
	axboe@...nel.dk
Subject: Re: [PATCH 3/5] writeback: nr_dirtied and nr_written in /proc/vmstat

On Mon, Sep 13, 2010 at 2:20 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Sun, 12 Sep 2010 22:58:11 -0700
> Michael Rubin <mrubin@...gle.com> wrote:
>
>> To help developers and applications gain visibility into writeback
>> behaviour adding two entries to vm_stat_items and /proc/vmstat. This
>> will allow us to track the "written" and "dirtied" counts.
>>
>>    # grep nr_dirtied /proc/vmstat
>>    nr_dirtied 3747
>>    # grep nr_written /proc/vmstat
>>    nr_written 3618
>>
>> Signed-off-by: Michael Rubin <mrubin@...gle.com>
>> Reviewed-by: Wu Fengguang <fengguang.wu@...el.com>
>> ---
>>  include/linux/mmzone.h |    2 ++
>>  mm/page-writeback.c    |    2 ++
>>  mm/vmstat.c            |    3 +++
>>  3 files changed, 7 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
>> index 6e6e626..d0d7454 100644
>> --- a/include/linux/mmzone.h
>> +++ b/include/linux/mmzone.h
>> @@ -104,6 +104,8 @@ enum zone_stat_item {
>>       NR_ISOLATED_ANON,       /* Temporary isolated pages from anon lru */
>>       NR_ISOLATED_FILE,       /* Temporary isolated pages from file lru */
>>       NR_SHMEM,               /* shmem pages (included tmpfs/GEM pages) */
>> +     NR_FILE_DIRTIED,        /* accumulated dirty pages */
>> +     NR_WRITTEN,             /* accumulated written pages */
>
> I think we can make those comments less ambiguous>
>
> --- a/include/linux/mmzone.h
> +++ a/include/linux/mmzone.h
> @@ -104,8 +104,8 @@ enum zone_stat_item {
>        NR_ISOLATED_ANON,       /* Temporary isolated pages from anon lru */
>        NR_ISOLATED_FILE,       /* Temporary isolated pages from file lru */
>        NR_SHMEM,               /* shmem pages (included tmpfs/GEM pages) */
> -       NR_FILE_DIRTIED,        /* accumulated dirty pages */
> -       NR_WRITTEN,             /* accumulated written pages */
> +       NR_FILE_DIRTIED,        /* page dirtyings since bootup */
> +       NR_WRITTEN,             /* page writings since bootup */

Got it. Will fix.

> The mismatch between "NR_FILE_DIRTIED" and "nr_dirtied" is a bit, umm,
> dirty.  I can kinda see the logic in the naming but still..

Got it will fix.

mrubin
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