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core: ask RealtimeKit for RT scheduling

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This commit is contained in:
Lennart Poettering 2009-06-19 04:19:08 +02:00
parent 6ad3855639
commit 8474fd7c62
4 changed files with 337 additions and 20 deletions
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6
src/Makefile.am
View file

@ -573,6 +573,7 @@ libpulsecommon_@PA_MAJORMINORMICRO@_la_SOURCES = \
pulsecore/conf-parser.c pulsecore/conf-parser.h \
pulsecore/core-error.c pulsecore/core-error.h \
pulsecore/core-util.c pulsecore/core-util.h \
pulsecore/rtkit.c pulsecore/rtkit.h \
pulsecore/creds.h \
pulsecore/dynarray.c pulsecore/dynarray.h \
pulsecore/endianmacros.h \
@ -1735,6 +1736,11 @@ update-reserve:
wget -O modules/$$i http://git.0pointer.de/\?p=reserve.git\;a=blob_plain\;f=$$i\;hb=master ; \
done
update-rtkit:
for i in rtkit.c rtkit.h ; do \
wget -O pulsecore/$$i http://git.0pointer.de/\?p=rtkit.git\;a=blob_plain\;f=$$i\;hb=master ; \
done
# Automatically generate linker version script. We use the same one for all public .sos
update-map-file:
( echo "PULSE_0 {" ; \

92
src/pulsecore/core-util.c
View file

@ -50,6 +50,10 @@
#ifdef HAVE_SCHED_H
#include <sched.h>
#if defined(__linux__) && !defined(SCHED_RESET_ON_FORK)
#define SCHED_RESET_ON_FORK 0x40000000
#endif
#endif
#ifdef HAVE_SYS_RESOURCE_H
@ -92,6 +96,10 @@
#include <xlocale.h>
#endif
#ifdef HAVE_DBUS
#include "rtkit.h"
#endif
#include <pulse/xmalloc.h>
#include <pulse/util.h>
#include <pulse/utf8.h>
@ -552,16 +560,68 @@ char *pa_strlcpy(char *b, const char *s, size_t l) {
return b;
}
static int set_scheduler(int rtprio) {
struct sched_param sp;
int r;
#ifdef HAVE_DBUS
DBusError error;
DBusConnection *bus;
dbus_error_init(&error);
#endif
pa_zero(sp);
sp.sched_priority = rtprio;
#ifdef SCHED_RESET_ON_FORK
if ((r = pthread_setschedparam(pthread_self(), SCHED_RR|SCHED_RESET_ON_FORK, &sp)) == 0) {
pa_log_debug("SCHED_RR|SCHED_RESET_ON_FORK worked.");
return 0;
}
#endif
if ((r = pthread_setschedparam(pthread_self(), SCHED_RR, &sp)) == 0) {
pa_log_debug("SCHED_RR 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_realtime(bus, 0, rtprio);
dbus_connection_unref(bus);
if (r >= 0) {
pa_log_debug("RealtimeKit worked.");
return 0;
}
errno = -r;
#else
errno = r;
#endif
return -1;
}
/* Make the current thread a realtime thread, and acquire the highest
* rtprio we can get that is less or equal the specified parameter. If
* the thread is already realtime, don't do anything. */
int pa_make_realtime(int rtprio) {
#ifdef _POSIX_PRIORITY_SCHEDULING
struct sched_param sp;
int r, policy;
struct sched_param sp;
int rtprio_try;
memset(&sp, 0, sizeof(sp));
pa_zero(sp);
policy = 0;
if ((r = pthread_getschedparam(pthread_self(), &policy, &sp)) != 0) {
@ -569,29 +629,29 @@ int pa_make_realtime(int rtprio) {
return -1;
}
if (policy == SCHED_FIFO && sp.sched_priority >= rtprio) {
pa_log_info("Thread already being scheduled with SCHED_FIFO with priority %i.", sp.sched_priority);
#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;
}
sp.sched_priority = rtprio;
if ((r = pthread_setschedparam(pthread_self(), SCHED_FIFO, &sp)) != 0) {
if (set_scheduler(rtprio) >= 0) {
pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i.", rtprio);
return 0;
}
while (sp.sched_priority > 1) {
sp.sched_priority --;
if ((r = pthread_setschedparam(pthread_self(), SCHED_FIFO, &sp)) == 0) {
pa_log_info("Successfully enabled SCHED_FIFO scheduling for thread, with priority %i, which is lower than the requested %i.", sp.sched_priority, rtprio);
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);
return 0;
}
}
pa_log_warn("pthread_setschedparam(): %s", pa_cstrerror(r));
pa_log_warn("Failed to acquire real-time scheduling: %s", pa_cstrerror(r));
return -1;
}
pa_log_info("Successfully enabled SCHED_FIFO scheduling for thread, with priority %i.", sp.sched_priority);
return 0;
#else
errno = ENOTSUP;

189
src/pulsecore/rtkit.c Normal file
View file

@ -0,0 +1,189 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
Copyright 2009 Lennart Poettering
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
***/
#include <errno.h>
#include "rtkit.h"
#ifdef __linux__
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
static pid_t _gettid(void) {
return (pid_t) syscall(SYS_gettid);
}
static int translate_error(const char *name) {
if (strcmp(name, DBUS_ERROR_NO_MEMORY) == 0)
return -ENOMEM;
if (strcmp(name, DBUS_ERROR_SERVICE_UNKNOWN) == 0 ||
strcmp(name, DBUS_ERROR_NAME_HAS_NO_OWNER) == 0)
return -ENOENT;
if (strcmp(name, DBUS_ERROR_ACCESS_DENIED) == 0 ||
strcmp(name, DBUS_ERROR_AUTH_FAILED) == 0)
return -EACCES;
return -EIO;
}
int rtkit_make_realtime(DBusConnection *connection, pid_t thread, int priority) {
DBusMessage *m = NULL, *r = NULL;
dbus_uint64_t u64;
dbus_uint32_t u32;
DBusError error;
int ret;
dbus_error_init(&error);
if (thread == 0)
thread = _gettid();
if (!(m = dbus_message_new_method_call(
RTKIT_SERVICE_NAME,
RTKIT_OBJECT_PATH,
"org.freedesktop.RealtimeKit1",
"MakeThreadRealtime"))) {
ret = -ENOMEM;
goto finish;
}
u64 = (dbus_uint64_t) thread;
u32 = (dbus_uint32_t) priority;
if (!dbus_message_append_args(
m,
DBUS_TYPE_UINT64, &u64,
DBUS_TYPE_UINT32, &u32,
DBUS_TYPE_INVALID)) {
ret = -ENOMEM;
goto finish;
}
if (!(r = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
ret = translate_error(error.name);
goto finish;
}
if (dbus_set_error_from_message(&error, r)) {
ret = translate_error(error.name);
goto finish;
}
ret = 0;
finish:
if (m)
dbus_message_unref(m);
if (r)
dbus_message_unref(r);
dbus_error_free(&error);
return ret;
}
int rtkit_make_high_priority(DBusConnection *connection, pid_t thread, int nice_level) {
DBusMessage *m = NULL, *r = NULL;
dbus_uint64_t u64;
dbus_int32_t s32;
DBusError error;
int ret;
dbus_error_init(&error);
if (thread == 0)
thread = _gettid();
if (!(m = dbus_message_new_method_call(
RTKIT_SERVICE_NAME,
RTKIT_OBJECT_PATH,
"org.freedesktop.RealtimeKit1",
"MakeThreadHighPriority"))) {
ret = -ENOMEM;
goto finish;
}
u64 = (dbus_uint64_t) thread;
s32 = (dbus_int32_t) nice_level;
if (!dbus_message_append_args(
m,
DBUS_TYPE_UINT64, &u64,
DBUS_TYPE_INT32, &s32,
DBUS_TYPE_INVALID)) {
ret = -ENOMEM;
goto finish;
}
if (!(r = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
ret = translate_error(error.name);
goto finish;
}
if (dbus_set_error_from_message(&error, r)) {
ret = translate_error(error.name);
goto finish;
}
ret = 0;
finish:
if (m)
dbus_message_unref(m);
if (r)
dbus_message_unref(r);
dbus_error_free(&error);
return ret;
}
#else
int rtkit_make_realtime(DBusConnection *connection, pid_t thread, int priority) {
return -ENOTSUP;
}
int rtkit_make_high_priority(DBusConnection *connection, pid_t thread, int nice_level) {
return -ENOTSUP;
}
#endif

62
src/pulsecore/rtkit.h Normal file
View file

@ -0,0 +1,62 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#ifndef foortkithfoo
#define foortkithfoo
/***
Copyright 2009 Lennart Poettering
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
***/
#include <sys/types.h>
#include <dbus/dbus.h>
#ifdef __cplusplus
extern "C" {
#endif
/* This is the reference implementation for a client for
* RealtimeKit. You don't have to use this, but if do, just copy these
* sources into your repository */
#define RTKIT_SERVICE_NAME "org.freedesktop.RealtimeKit1"
#define RTKIT_OBJECT_PATH "/org/freedesktop/RealtimeKit1"
/* This is mostly equivalent to sched_setparam(thread, SCHED_RR, {
* .sched_priority = priority }). 'thread' needs to be a kernel thread
* id as returned by gettid(), not a pthread_t! If 'thread' is 0 the
* current thread is used. The returned value is a negative errno
* style error code, or 0 on success. */
int rtkit_make_realtime(DBusConnection *system_bus, pid_t thread, int priority);
/* This is mostly equivalent to setpriority(PRIO_PROCESS, thread,
* nice_level). 'thread' needs to be a kernel thread id as returned by
* gettid(), not a pthread_t! If 'thread' is 0 the current thread is
* used. The returned value is a negative errno style error code, or 0
* on success.*/
int rtkit_make_high_priority(DBusConnection *system_bus, pid_t thread, int nice_level);
#ifdef __cplusplus
}
#endif
#endif