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core: Set SCHED_RR by default on Wayland sessions

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This still may fail if the executable is missing the right capability.
This can no longer depend on a setting as we want this to happen
before capabilities are dropped (and before other threads are spawned).

The necessary bits (eg. "setcap CAP_SYS_NICE=+ep `which gnome-shell`")
are still left up to users/distributors.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/923
This commit is contained in:
Carlos Garnacho 2019-02-27 19:02:25 +01:00
parent 9d61e6e56f
commit b7a662bfdd
2 changed files with 21 additions and 15 deletions
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15
src/backends/native/meta-backend-native.c
View File

@ -341,7 +341,6 @@ static void
meta_backend_native_post_init (MetaBackend *backend)
{
ClutterDeviceManager *manager = clutter_device_manager_get_default ();
MetaSettings *settings = meta_backend_get_settings (backend);
META_BACKEND_CLASS (meta_backend_native_parent_class)->post_init (backend);
@ -349,20 +348,6 @@ meta_backend_native_post_init (MetaBackend *backend)
NULL, NULL);
meta_device_manager_native_set_relative_motion_filter (manager, relative_motion_filter,
meta_backend_get_monitor_manager (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)
};
retval = sched_setscheduler (0, SCHED_RR | SCHED_RESET_ON_FORK, &sp);
if (retval != 0)
g_warning ("Failed to set RT scheduler: %m");
}
}
static MetaMonitorManager *

21
src/core/main.c
View File

@ -522,6 +522,22 @@ meta_override_compositor_configuration (MetaCompositorType compositor_type,
_backend_gtype_override = backend_gtype;
}
#ifdef HAVE_NATIVE_BACKEND
static void
meta_set_scheduler (void)
{
int retval;
struct sched_param sp = {
.sched_priority = sched_get_priority_min (SCHED_RR)
};
retval = sched_setscheduler (0, SCHED_RR | SCHED_RESET_ON_FORK, &sp);
if (retval != 0)
g_warning ("Failed to set RT scheduler: %m");
}
#endif /* HAVE_NATIVE_BACKEND */
/**
* meta_init: (skip)
*
@ -573,6 +589,11 @@ meta_init (void)
meta_set_is_wayland_compositor (TRUE);
#endif
#ifdef HAVE_NATIVE_BACKEND
if (backend_gtype == META_TYPE_BACKEND_NATIVE)
meta_set_scheduler ();
#endif
g_unix_signal_add (SIGTERM, on_sigterm, NULL);
if (g_get_home_dir ())