Re: [RFC][PATCH 0/1] MAZE: Mazed processes monitor

From: Hirofumi Nakagawa
Date: Thu May 22 2008 - 05:36:48 EST

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.

Hirofumi Nakagawa

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