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backends/native: Use rtkit to get realtime priority

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Instead of using sched_setscheduler directly (and relying that we
somehow got CAP_SYS_NICE), use rtkit to do this for us.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2284
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2060>
This commit is contained in:
Carlos Garnacho
2021-10-21 13:40:55 +02:00
committed by Marge Bot
parent 7c6fe21daf
commit 820aa18126
4 changed files with 79 additions and 11 deletions
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37
src/backends/native/meta-backend-native.c
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@ -38,7 +38,6 @@
#include "backends/native/meta-backend-native-private.h"
#include "backends/native/meta-input-thread.h"
#include <sched.h>
#include <stdlib.h>
#include "backends/meta-cursor-tracker-private.h"
@ -61,6 +60,7 @@
#include "cogl/cogl.h"
#include "core/meta-border.h"
#include "meta/main.h"
#include "meta-dbus-rtkit1.h"
#ifdef HAVE_REMOTE_DESKTOP
#include "backends/meta-screen-cast.h"
@ -209,15 +209,36 @@ meta_backend_native_post_init (MetaBackend *backend)
if (meta_settings_is_experimental_feature_enabled (settings,
META_EXPERIMENTAL_FEATURE_RT_SCHEDULER))
{
int retval;
struct sched_param sp = {
.sched_priority = sched_get_priority_min (SCHED_RR)
};
g_autoptr (MetaDbusRealtimeKit1) rtkit_proxy = NULL;
g_autoptr (GError) error = NULL;
retval = sched_setscheduler (0, SCHED_RR | SCHED_RESET_ON_FORK, &sp);
rtkit_proxy =
meta_dbus_realtime_kit1_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
"org.freedesktop.RealtimeKit1",
"/org/freedesktop/RealtimeKit1",
NULL,
&error);
if (retval != 0)
g_warning ("Failed to set RT scheduler: %m");
if (rtkit_proxy)
{
uint32_t priority;
priority = sched_get_priority_min (SCHED_RR);
meta_dbus_realtime_kit1_call_make_thread_realtime_sync (rtkit_proxy,
gettid (),
priority,
NULL,
&error);
}
if (error)
{
g_dbus_error_strip_remote_error (error);
g_message ("Failed to set RT scheduler: %s", error->message);
}
}
#ifdef HAVE_REMOTE_DESKTOP