RFC: Attaching threads to cgroups is OK?

Takuya Yoshikawa yoshikawa.takuya at oss.ntt.co.jp
Thu Aug 21 18:03:29 PDT 2008

Hi Kamezawa-san,

KAMEZAWA Hiroyuki wrote:
> On Wed, 20 Aug 2008 16:12:47 +0900 (JST)
> Hirokazu Takahashi <taka at valinux.co.jp> wrote:
>>  - I think this kind of thread application should control its I/O requests
>>    inside of the application. I guess it seems to quite difficult to
>>    determine which thread is doing what kind of job in the application.
>>    We can just leave this issue to these type of applications, can we?
>>    I guess most of this kind of applications must have been well designed
>>    already.
> I agree. (it's better to postpone this.)
> But maybe cpuset (HPC) applications uses per-thread cgroup attachment.
> So, I can't say there is no trouble even if we ignore threads.

Thank you for details.

I feel that we are near a consensus on this problem. To make clear this 
not only for developers but also for users what do you think about 
making documentation and implementing can_attach() to avoid not presumed 

For example,
1. reject attachments of threads by can_attach(),
2. explain about what will and will not happen if we attach threads,


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