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acrn-dm: set realtime sched policy for vcpu thread

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To reduce the io emulation impact to audio FE which could
trigger audio glitch.

Tracked-On: #2717
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
This commit is contained in:
Yin Fengwei 2019-03-08 18:43:23 +08:00 committed by wenlingz
parent 80d3584b07
commit 8144f6218c
1 changed files with 37 additions and 0 deletions
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37
devicemodel/core/main.c
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@ -26,6 +26,10 @@
* $FreeBSD$ * $FreeBSD$
*/ */
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
@ -248,6 +252,37 @@ high_bios_size(void)
return roundup2(size, 2 * MB); return roundup2(size, 2 * MB);
} }
static void
adjust_schedule_policy(int policy, int prio)
{
char tid_str[MAXLOGNAME];
ssize_t written;
int error, cg_task_fd;
struct sched_param sched_param;
error = snprintf(tid_str, MAXLOGNAME, "%ld", syscall(SYS_gettid));
if (error >= MAXLOGNAME) {
fprintf(stderr, "tid string overflow\r\n");
return;
}
cg_task_fd = open("/sys/fs/cgroup/cpu/task", O_RDWR);
if (cg_task_fd > 0) {
written = write(cg_task_fd, tid_str, strnlen(tid_str, MAXLOGNAME));
if (written < 0) {
fprintf(stderr, "can't add thread%s to cgroup\r\n", tid_str);
}
} else {
fprintf(stderr, "can't open cgroup task file\r\n");
}
sched_param.sched_priority = prio;
error = pthread_setschedparam(pthread_self(), policy, &sched_param);
if (error != 0) {
fprintf(stderr, "set vm_loop to SCHED_FIFO failed\r\n");
}
}
static void * static void *
start_thread(void *param) start_thread(void *param)
{ {
@ -261,6 +296,8 @@ start_thread(void *param)
snprintf(tname, sizeof(tname), "vcpu %d", vcpu); snprintf(tname, sizeof(tname), "vcpu %d", vcpu);
pthread_setname_np(mtp->mt_thr, tname); pthread_setname_np(mtp->mt_thr, tname);
adjust_schedule_policy(SCHED_FIFO, 10);
vm_loop(mtp->mt_ctx); vm_loop(mtp->mt_ctx);
/* reset or halt */ /* reset or halt */