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core: use rtkit to acquire high-priority scheduling

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This commit is contained in:
Lennart Poettering 2009-06-19 04:45:19 +02:00
parent 8474fd7c62
commit bacc5ca6f4
2 changed files with 53 additions and 114 deletions
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164
src/pulsecore/core-util.c
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@ -617,40 +617,20 @@ static int set_scheduler(int rtprio) {
int pa_make_realtime(int rtprio) {
#ifdef _POSIX_PRIORITY_SCHEDULING
int r, policy;
struct sched_param sp;
int rtprio_try;
pa_zero(sp);
policy = 0;
if ((r = pthread_getschedparam(pthread_self(), &policy, &sp)) != 0) {
pa_log("pthread_getschedgetparam(): %s", pa_cstrerror(r));
return -1;
}
#ifdef SCHED_RESET_ON_FORK
policy &= ~SCHED_RESET_ON_FORK;
#endif
if ((policy == SCHED_FIFO || policy == SCHED_RR) && sp.sched_priority >= rtprio) {
pa_log_info("Thread already being scheduled with SCHED_FIFO/SCHED_RR with priority %i.", sp.sched_priority);
return 0;
}
int p;
if (set_scheduler(rtprio) >= 0) {
pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i.", rtprio);
return 0;
}
for (rtprio_try = rtprio-1; rtprio_try >= 1; rtprio_try--) {
if (set_scheduler(rtprio_try)) {
pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i, which is lower than the requested %i.", rtprio_try, rtprio);
for (p = rtprio-1; p >= 1; p--)
if (set_scheduler(p)) {
pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i, which is lower than the requested %i.", p, rtprio);
return 0;
}
}
pa_log_warn("Failed to acquire real-time scheduling: %s", pa_cstrerror(r));
pa_log_info("Failed to acquire real-time scheduling: %s", pa_cstrerror(errno));
return -1;
#else
@ -659,80 +639,42 @@ int pa_make_realtime(int rtprio) {
#endif
}
/* This is merely used for giving the user a hint. This is not correct
* for anything security related */
pa_bool_t pa_can_realtime(void) {
static int set_nice(int nice_level) {
#ifdef HAVE_DBUS
DBusError error;
DBusConnection *bus;
int r;
if (geteuid() == 0)
return TRUE;
#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_RTPRIO)
{
struct rlimit rl;
if (getrlimit(RLIMIT_RTPRIO, &rl) >= 0)
if (rl.rlim_cur > 0 || rl.rlim_cur == RLIM_INFINITY)
return TRUE;
}
dbus_error_init(&error);
#endif
#if defined(HAVE_SYS_CAPABILITY_H) && defined(CAP_SYS_NICE)
{
cap_t cap;
if ((cap = cap_get_proc())) {
cap_flag_value_t flag = CAP_CLEAR;
if (cap_get_flag(cap, CAP_SYS_NICE, CAP_EFFECTIVE, &flag) >= 0)
if (flag == CAP_SET) {
cap_free(cap);
return TRUE;
}
cap_free(cap);
}
if (setpriority(PRIO_PROCESS, 0, nice_level) >= 0) {
pa_log_debug("setpriority() worked.");
return 0;
}
#ifdef HAVE_DBUS
/* Try to talk to RealtimeKit */
if (!(bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
pa_log("Failed to connect to system bus: %s\n", error.message);
dbus_error_free(&error);
errno = -EIO;
return -1;
}
r = rtkit_make_high_priority(bus, 0, nice_level);
dbus_connection_unref(bus);
if (r >= 0) {
pa_log_debug("RealtimeKit worked.");
return 0;
}
errno = -r;
#endif
return FALSE;
}
/* This is merely used for giving the user a hint. This is not correct
* for anything security related */
pa_bool_t pa_can_high_priority(void) {
if (geteuid() == 0)
return TRUE;
#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_RTPRIO)
{
struct rlimit rl;
if (getrlimit(RLIMIT_NICE, &rl) >= 0)
if (rl.rlim_cur >= 21 || rl.rlim_cur == RLIM_INFINITY)
return TRUE;
}
#endif
#if defined(HAVE_SYS_CAPABILITY_H) && defined(CAP_SYS_NICE)
{
cap_t cap;
if ((cap = cap_get_proc())) {
cap_flag_value_t flag = CAP_CLEAR;
if (cap_get_flag(cap, CAP_SYS_NICE, CAP_EFFECTIVE, &flag) >= 0)
if (flag == CAP_SET) {
cap_free(cap);
return TRUE;
}
cap_free(cap);
}
}
#endif
return FALSE;
return -1;
}
/* Raise the priority of the current process as much as possible that
@ -740,22 +682,21 @@ pa_bool_t pa_can_high_priority(void) {
int pa_raise_priority(int nice_level) {
#ifdef HAVE_SYS_RESOURCE_H
if (setpriority(PRIO_PROCESS, 0, nice_level) < 0) {
int n;
int n;
for (n = nice_level+1; n < 0; n++) {
if (setpriority(PRIO_PROCESS, 0, n) == 0) {
pa_log_info("Successfully acquired nice level %i, which is lower than the requested %i.", n, nice_level);
return 0;
}
}
pa_log_warn("setpriority(): %s", pa_cstrerror(errno));
return -1;
if (set_nice(nice_level) >= 0) {
pa_log_info("Successfully gained nice level %i.", nice_level);
return 0;
}
pa_log_info("Successfully gained nice level %i.", nice_level);
for (n = nice_level+1; n < 0; n++)
if (set_nice(n) > 0) {
pa_log_info("Successfully acquired nice level %i, which is lower than the requested %i.", n, nice_level);
return 0;
}
pa_log_info("Failed to acquire high-priority scheduling: %s", pa_cstrerror(errno));
return -1;
#endif
#ifdef OS_IS_WIN32
@ -763,9 +704,10 @@ int pa_raise_priority(int nice_level) {
if (!SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS)) {
pa_log_warn("SetPriorityClass() failed: 0x%08X", GetLastError());
errno = EPERM;
return .-1;
} else
pa_log_info("Successfully gained high priority class.");
return -1;
}
pa_log_info("Successfully gained high priority class.");
}
#endif
@ -780,8 +722,8 @@ void pa_reset_priority(void) {
setpriority(PRIO_PROCESS, 0, 0);
memset(&sp, 0, sizeof(sp));
pa_assert_se(pthread_setschedparam(pthread_self(), SCHED_OTHER, &sp) == 0);
pa_zero(sp);
pthread_setschedparam(pthread_self(), SCHED_OTHER, &sp);
#endif
#ifdef OS_IS_WIN32