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Date: Wed, 9 Jan 2002 17:34:09 -0500 (EST)
From: Mark Hahn <hahn@physics.mcmaster.ca>
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To: Ingo Molnar <mingo@elte.hu>
cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [patch] O(1) scheduler, -D1, 2.5.2-pre9, 2.4.17
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> no wonder, it should be 'nice -n -20 vmstat -n 1'. And you should also do

I keep a suid setrealtime wrapper around (UNSAFE!) for this kind of use:

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

int main(int argc, char *argv[]) {
    static struct sched_param sched_parms;
    int pid, wrapper=0;

    if (argc <= 1)
        return 1;

    pid = atoi(argv[1]);

    if (!pid || argc != 2) {
        wrapper = 1;
        pid = getpid();
    }

    sched_parms.sched_priority = sched_get_priority_min(SCHED_FIFO);
    if (sched_setscheduler(pid, SCHED_FIFO, &sched_parms) == -1) {
        perror("cannot set realtime scheduling policy");
        return 1;
    }
    if (wrapper) {
        setuid(getuid());
        execvp(argv[1],&argv[1]);
        perror("exec failed");
        return 1;
    }
    return 0;
}

regards, mark hahn.

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