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picom
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core: use SCHED_RR scheduling 

Make picom realtime to reduce latency, and make rendering times more
predictable to help pacing.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2023-06-10 14:18:25 +01:00
parent b6e7ea5639
commit 7d9692360b
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1 changed files with 27 additions and 0 deletions
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27
src/picom.c
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@ -19,6 +19,7 @@
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/resource.h>
#include <unistd.h>
#include <xcb/composite.h>
#include <xcb/damage.h>
@ -2553,6 +2554,31 @@ err:
free(ps);
return NULL;
}
void set_rr_scheduling(void) {
struct rlimit rlim;
if (getrlimit(RLIMIT_RTPRIO, &rlim) != 0) {
log_warn("Failed to get RLIMIT_RTPRIO, not setting real-time priority");
return;
}
int old_policy;
int ret;
struct sched_param param;
ret = pthread_getschedparam(pthread_self(), &old_policy, &param);
if (ret != 0) {
log_debug("Failed to get old scheduling priority");
return;
}
param.sched_priority = (int)rlim.rlim_cur;
ret = pthread_setschedparam(pthread_self(), SCHED_RR, &param);
if (ret != 0) {
log_info("Failed to set scheduling priority to %lu", rlim.rlim_cur);
return;
}
log_info("Set scheduling priority to %lu", rlim.rlim_cur);
}
/**
* Destroy a session.
@ -2760,6 +2786,7 @@ static void session_destroy(session_t *ps) {
* @param ps current session
*/
static void session_run(session_t *ps) {
set_rr_scheduling();
// In benchmark mode, we want draw_timer handler to always be active
if (ps->o.benchmark) {
ev_timer_set(&ps->draw_timer, 0, 0);