RFC MAZE: Mazed processes monitor

Hi all.

This patch provides the mazed process monitor,named MAZE.
MAZE's purpose is to notify or terminate registered processes when they are mazed. The definition of mazed process is a process using excessive CPU cycles, that is long time keeping TASK_RUNNING state.
MAZE detects mazed processes and sends specified signals to them. This implements a CGL (Carrier Grade Linux) requirement (AVL.14.0).

Possible uses:
* High-Availability system
* system using many Real-Time processes such as embedded

Please any comments!

Hirofumi Nakagawa

--- Usage
Add monitoring process.

% echo "1234 10000 20000 24 9" > /proc/maze/entries

The numeric values are "pid","soft limit [msec]","hard limit [msec]", "soft signal" and "hard signal".

Get monitoring process list.

% cat /proc/maze/entries

--- Example
As follows example express the feature of MAZE function.

--
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])

{
    int state,i;
    char cmd[128];

    sprintf(cmd, "echo \"%d 10000 20000 24 9\" > /proc/maze/entries", getpid());
    system(cmd);

    if (!fork()) {
        printf("Mazed process start.\n");
        for(;;);
    }

    if (!fork()) {
        printf("Not mazed process start.\n");
        for(i = 0;i < 20; i++)
            sleep(1);
        printf("Not mazed process finish.\n");
        exit(0);
    }

    for (i = 0;i < 2; i++)
         wait(&state);

    return 0;
}

--
---