linux-kernel - [RFC][PATCH 0/2 v2] MAZE: Introduction

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Date:	Thu, 22 May 2008 19:01:13 +0900
From:	Hirofumi Nakagawa <hnakagawa@...aclelinux.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, Andi Kleen <andi@...stfloor.org>
Subject: [RFC][PATCH 0/2 v2] MAZE: Introduction

Hi all,

MAZE provides a mechanism for detecting excessive CPU cycle usage of
selected processes and sending signals to them.

The definition of excessive CPU cycle usage is staying in TASK_RUNNINT
state for a long time.
Normally, a working process doesn't stay long time in TASK_RUNNING state
because of occasional IO waits or calling sleeps.
MAZE detects excessive CPU cycle usage from process's information and sends
signal when time of staying in TASK_RUNNING exceeds user defined limits.

The aim is to implement a CGL (Carrier Grade Linux) requirement (AVL.14.0).

Quote from CGL specification: (http://developer.osdl.org/dev/cgl/cgl40/cgl40-availability.pdf)

OSDL CGL specifies that carrier grade Linux shall provide a
mechanism that detects excessive CPU cycle usage by any process or thread.
To enable detection, the following capabilities shall be provided:
 - Communication between the monitoring process and the kernel.
 - Registering a list of processes or threads and their allowed CPU cycle
   thresholds.
 - Ability to define policy based on process events including process/thread
   creation and exit.
 - Ability to take action whenever an event occurs.
 - Ability to set the CPU cycle threshold to a resolution of one millisecond.

Please review and tell me what you think.

Thanks.
Hirofumi Nakagawa

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