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backends/native: Main thread rt-scheduler: experimental feature no more

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To paraphrase jadahl: we have a dedicated KMS thread now, which also
has realtime scheduling enabled unconditionally. realtime scheduling
on the main thread isn't too great of an idea, considering GC can
take a hot minute.

And to quote rmader: we most likely won't be able to make the main
thread rt as long as we use GJS and thus have GC.

So let's get rid of it! It's just been breaking things anyways.

This just ignores the setting; we'll fully remove it when GNOME 46
comes around.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3296>
This commit is contained in:
Dallas Strouse 2023-10-18 17:34:15 -04:00 committed by Bilal Elmoussaoui
parent ecdd2aeb85
commit c8c5560916
4 changed files with 2 additions and 45 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
data/org.gnome.mutter.gschema.xml.in
View file

@ -3,8 +3,7 @@
<flags id="org.gnome.mutter.MetaExperimentalFeature">
<value nick="scale-monitor-framebuffer" value="1"/>
<value nick="kms-modifiers" value="2"/>
<value nick="rt-scheduler" value="4"/>
<value nick="autoclose-xwayland" value="8"/>
<value nick="autoclose-xwayland" value="4"/>
</flags>
<schema id="org.gnome.mutter" path="/org/gnome/mutter/"
@ -126,9 +125,6 @@
supported by the driver. Requires a
restart.
• “rt-scheduler” — makes mutter request a low priority
real-time scheduling. Requires a restart.
• “autoclose-xwayland” — automatically terminates Xwayland if all
relevant X11 clients are gone.
Requires a restart.

3
src/backends/meta-settings-private.h
View file

@ -30,8 +30,7 @@ typedef enum _MetaExperimentalFeature
META_EXPERIMENTAL_FEATURE_NONE = 0,
META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER = (1 << 0),
META_EXPERIMENTAL_FEATURE_KMS_MODIFIERS = (1 << 1),
META_EXPERIMENTAL_FEATURE_RT_SCHEDULER = (1 << 2),
META_EXPERIMENTAL_FEATURE_AUTOCLOSE_XWAYLAND = (1 << 3),
META_EXPERIMENTAL_FEATURE_AUTOCLOSE_XWAYLAND = (1 << 2),
} MetaExperimentalFeature;
typedef enum _MetaXwaylandExtension

2
src/backends/meta-settings.c
View file

@ -292,8 +292,6 @@ experimental_features_handler (GVariant *features_variant,
feature = META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER;
else if (g_str_equal (feature_str, "kms-modifiers"))
feature = META_EXPERIMENTAL_FEATURE_KMS_MODIFIERS;
else if (g_str_equal (feature_str, "rt-scheduler"))
feature = META_EXPERIMENTAL_FEATURE_RT_SCHEDULER;
else if (g_str_equal (feature_str, "autoclose-xwayland"))
feature = META_EXPERIMENTAL_FEATURE_AUTOCLOSE_XWAYLAND;

36
src/backends/native/meta-backend-native.c
View file

@ -216,45 +216,9 @@ static void
meta_backend_native_post_init (MetaBackend *backend)
{
MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend);
MetaSettings *settings = meta_backend_get_settings (backend);
META_BACKEND_CLASS (meta_backend_native_parent_class)->post_init (backend);
if (meta_settings_is_experimental_feature_enabled (settings,
META_EXPERIMENTAL_FEATURE_RT_SCHEDULER))
{
g_autoptr (MetaDBusRealtimeKit1) rtkit_proxy = NULL;
g_autoptr (GError) error = NULL;
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 (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
maybe_disable_screen_cast_dma_bufs (backend_native);
#endif