linux-kernel - Re: [PATCH V3 8/8] memcg: Document cgroup dirty/writeback memory statistics

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Message-ID: <CAFj3OHWyMoF=ykaneD-tBMoDrBfWT6VrUWQ871CHPTxU=Ce5jg@mail.gmail.com>
Date:	Sun, 6 Jan 2013 10:55:43 +0800
From:	Sha Zhengju <handai.szj@...il.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, mhocko@...e.cz, akpm@...ux-foundation.org,
	gthelen@...gle.com, fengguang.wu@...el.com, glommer@...allels.com,
	Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH V3 8/8] memcg: Document cgroup dirty/writeback memory statistics

On Fri, Dec 28, 2012 at 9:10 AM, Kamezawa Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> (2012/12/26 2:28), Sha Zhengju wrote:
>> From: Sha Zhengju <handai.szj@...bao.com>
>>
>> Signed-off-by: Sha Zhengju <handai.szj@...bao.com>
>
> I don't think your words are bad but it may be better to sync with meminfo's text.
>
>> ---
>>   Documentation/cgroups/memory.txt |    2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>> index addb1f1..2828164 100644
>> --- a/Documentation/cgroups/memory.txt
>> +++ b/Documentation/cgroups/memory.txt
>> @@ -487,6 +487,8 @@ pgpgin            - # of charging events to the memory cgroup. The charging
>>   pgpgout             - # of uncharging events to the memory cgroup. The uncharging
>>               event happens each time a page is unaccounted from the cgroup.
>>   swap                - # of bytes of swap usage
>> +dirty          - # of bytes of file cache that are not in sync with the disk copy.
>> +writeback      - # of bytes of file/anon cache that are queued for syncing to disk.
>>   inactive_anon       - # of bytes of anonymous memory and swap cache memory on
>>               LRU list.
>>   active_anon - # of bytes of anonymous and swap cache memory on active
>>
>
> Documentation/filesystems/proc.txt
>
>        Dirty: Memory which is waiting to get written back to the disk
>    Writeback: Memory which is actively being written back to the disk
>
> even if others are not ;(
>


The words are actually revised by Fengguang before:
https://lkml.org/lkml/2012/7/7/49
It might be more accurate than previous one and I just follow his advise...


Thanks,
Sha
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