Messages in this thread | | | Date | Thu, 22 May 2008 18:31:12 +0900 | From | Hirofumi Nakagawa <> | Subject | Re: [RFC][PATCH 0/1] MAZE: Mazed processes monitor |
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Hi Andrew,
Thank you for your comment and review.
> The immediate quesstion is, of course, "why does this need to be done > in-kernel?". I am unable to answer that from the provided changelog > information, and I should be able to do that.
It needs to be done in kernel because excessive CPU cycle usage is directly detected watching kernel internal task_struct.state. It's hard to get that information outside the kernel.
Additionally, this patch's aim is to implement a CGL (Carrier Grade Linux) requirement (AVL.14.0).
There are specs that can not be implemented outside the kernel. These are; - Communication between the monitoring process and the kernel - Ability to define policy based on process events including process/thread creation and exit, and, - Ability to set the CPU cycle threshold to a resolution of one millisecond.
Thanks. Hirofumi Nakagawa
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