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

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Date:	Tue, 14 Sep 2010 22:23:11 -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

I know it's been applied but in case you want minor nits fixed. I am
sending one more update.

mrubin

On Mon, Sep 13, 2010 at 3:17 PM, Michael Rubin <mrubin@...gle.com> wrote:
> 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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