Re: [Xen-devel] sedf parameter setting from dom0 user space...

["Tapdiya, Ashish" <ashish.tapdiya@xxxxxxxxxxxxxx>]

Hi,

I tried to set sedf parameters using domctl hypercall from user space (privcmd 
interface). If I specify both period and slice and zero out rest (extratime, 
latency, weight), I get a -1 (error) return value. However, If I specify weight 
then period and slice values are ignored and default values are assigned and 
return value is 0. Below is my hypercall code:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <xenctrl.h>
#include <xen/sys/privcmd.h>

int main (int argc, char **argv)
{
        int fd, ret;

        xen_domctl_t dom;

        dom.domain = 4;
        dom.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
        dom.cmd = XEN_DOMCTL_scheduler_op;
        dom.u.scheduler_op.sched_id = XEN_SCHEDULER_SEDF;
        dom.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_putinfo;
        dom.u.scheduler_op.u.sedf.period = 100;
        dom.u.scheduler_op.u.sedf.slice = 20;
        dom.u.scheduler_op.u.sedf.latency = 0;
        dom.u.scheduler_op.u.sedf.extratime = 0;
        dom.u.scheduler_op.u.sedf.weight = 0;

        privcmd_hypercall_t hcall = 
        {
                __HYPERVISOR_domctl,
                {(unsigned long)&dom, 0, 0, 0, 0}
        };

        fd = open ("/proc/xen/privcmd", O_RDWR);
        if (fd <0) 
                printf("in here\n");
        else
                printf("fd = %d\n", fd);

        ret = ioctl (fd,IOCTL_PRIVCMD_HYPERCALL, &hcall);

        printf ("ret = %d\n", ret);
} 

Although things work fine from xm tools.

Thanks,
~Ashish

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