linux-kernel - Re: [PATCH 6/7] bio-cgroup: Implement the bio-cgroup

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Date:	Fri, 08 Aug 2008 18:42:36 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Ryo Tsuruta <ryov@...inux.co.jp>
CC:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, agk@...rceware.org
Subject: Re: [PATCH 6/7] bio-cgroup: Implement the bio-cgroup

Hi Tsuruta-san,

Ryo Tsuruta wrote:
> Hi Yoshikawa-san,
> 
>>> +static void bio_cgroup_move_task(struct cgroup_subsys *ss,
>>> +				struct cgroup *cont,
>>> +				struct cgroup *old_cont,
>>> +				struct task_struct *p)
>>> +{
>>> +	struct mm_struct *mm;
>>> +	struct bio_cgroup *biog, *old_biog;
>>> +
>>> +	if (bio_cgroup_disabled())
>>> +		return;
>>> +
>>> +	mm = get_task_mm(p);
>>> +	if (mm == NULL)
>>> +		return;
>>> +
>>> +	biog = cgroup_bio(cont);
>>> +	old_biog = cgroup_bio(old_cont);
>>> +
>>> +	mmput(mm);
>>> +	return;
>>> +}
>> Is this function fully implemented?
> 
> This function can be more simplified, there is some unnecessary code 
> from old version.
> 

I think it is neccessary to attach the task p to new biog.

>> I tried to put a process into a group by writing to
>> "/cgroup/bio/BGROUP/tasks" but failed.
> 
> Could you tell me what you actually did? I will try the same thing.
> 
> --
> Ryo Tsuruta <ryov@...inux.co.jp>
> 

I wanted to test my own scheduler which uses bio tracking information.
SO I tried your patch, especially, get_bio_cgroup_iocontext(), to get
the io_context from bio.

In my test, I made some threads with certain iopriorities run 
concurrently. To schedule these threads based on their iopriorities,
I made BGROUP directories for each iopriorities.
e.g. /cgroup/bio/be0 ... /cgroup/bio/be7
Then, I tried to attach the processes to the appropriate groups.

But the processes stayed in the original group(id=0).
...

I am sorry but I have to leave now and I cannot come here next week.
--> I will take summer holidays.

I will reply to you later.

Thanks,
- Takuya Yoshikawa
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