ionice kills vanilla 2.6.0-test9 was [Re: [PATCH] cfq + io priorities (fwd)]

From: Pavel Machek (pavel_at_suse.cz)
Date: 11/21/03

  • Next message: Andrew Morton: "Re: DIRECT IO for ext3/ext2." 
    Date: 	Fri, 21 Nov 2003 16:39:00 +0100
To: Jens Axboe <axboe@suse.de>, Linux Kernel <linux-kernel@vger.kernel.org>

    Hi!

    > > I'm attaching the simple ionice tool. It's used as follows:
    >
    > Here's one that works, sorry about that. To compile:
    >
    > # gcc -Wall -D__X86 -o ionice ionice.c
    >
    > or other define for PPC or X86_64.

    Well, did that, run it on vanilla kernel, and it kills the
    machine. Can someone reproduce it?
                                                            Pavel
    [What is needed to start using cfq? Is your patch, this utility and
    elevator=cfq enough?]

    #include <stdio.h>
    #include <stdlib.h>
    #include <errno.h>
    #include <getopt.h>
    #include <unistd.h>
    #include <sys/ptrace.h>
    #include <asm/unistd.h>

    extern int sys_ioprio_set(int);
    extern int sys_ioprio_get(void);

    #ifdef __X86
    #define __NR_ioprio_set 274
    #define __NR_ioprio_get 275
    #endif

    #ifdef __X86_64
    #define __NR_ioprio_set 237
    #define __NR_ioprio_get 238
    #endif

    #ifdef __PPC
    #define __NR_ioprio_set 255
    #define __NR_ioprio_get 256
    #endif

    #ifndef __NR_ioprio_set
    #error set arch
    #endif

    _syscall1(int, ioprio_set, int, ioprio);
    _syscall0(int, ioprio_get);

    int main(int argc, char *argv[])
    {
            int ioprio = 2, set = 0;
            int c;

            while ((c = getopt(argc, argv, "+n:")) != EOF) {
                    switch (c) {
                    case 'n':
                            ioprio = strtol(optarg, NULL, 10);
                            set = 1;
                            break;
                    }
            }

            if (!set)
                    printf("%d\n", ioprio_get());
            else if (argv[optind]) {
                    if (ioprio_set(ioprio) == -1) {
                            perror("ioprio_set");
                            return 1;
                    }

                    execvp(argv[optind], &argv[optind]);
            }
            return 0;
    }

    ----- End forwarded message ----- 

    -- 
				Pavel
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...
-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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