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backends/native: Add rt-scheduler experimental key to set RT scheduling

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This is similar to a change in kwin:
https://blog.martin-graesslin.com/blog/2017/09/kwinwayland-goes-real-time/

If the experimental features key has "rt-scheduler", make it claim the lowest
of RT scheduler priorities, this will be both educated to other RT processes
and improves responsiveness wrt all other processes.

This can only work if mutter/gnome-shell process receives CAP_SYS_NICE
somehow, e.g.: "setcap CAP_SYS_NICE=+ep `which gnome-shell`"

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/921
https://gitlab.gnome.org/GNOME/mutter/merge_requests/460
This commit is contained in:
Carlos Garnacho
2019-02-27 19:02:25 +01:00
committed by Georges Basile Stavracas Neto
parent 01d0316fd7
commit dae2c1d420
4 changed files with 24 additions and 0 deletions
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2
src/backends/meta-settings.c
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@ -264,6 +264,8 @@ experimental_features_handler (GVariant *features_variant,
features |= META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER;
else if (g_str_equal (feature, "kms-modifiers"))
features |= META_EXPERIMENTAL_FEATURE_KMS_MODIFIERS;
else if (g_str_equal (feature, "rt-scheduler"))
features |= META_EXPERIMENTAL_FEATURE_RT_SCHEDULER;
else
g_info ("Unknown experimental feature '%s'\n", feature);
}