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