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kms: Add debug env var to configure thread implementation type

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Set MUTTER_DEBUG_KMS_THREAD_TYPE to either 'kernel' or 'user', and the
MetaThread backend will be either a kernel thread or a user thread.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2777>
This commit is contained in:
Jonas Ådahl 2021-06-28 11:50:30 +02:00
parent 8b612a6150
commit f1356ce5d3
1 changed files with 14 additions and 1 deletions
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15
src/backends/native/meta-kms.c
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@ -431,12 +431,25 @@ meta_kms_new (MetaBackend *backend,
MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend); MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend);
MetaUdev *udev = meta_backend_native_get_udev (backend_native); MetaUdev *udev = meta_backend_native_get_udev (backend_native);
MetaKms *kms; MetaKms *kms;
const char *thread_type_string;
MetaThreadType thread_type = META_THREAD_TYPE_USER;
thread_type_string = g_getenv ("MUTTER_DEBUG_KMS_THREAD_TYPE");
if (thread_type_string)
{
if (g_strcmp0 (thread_type_string, "user") == 0)
thread_type = META_THREAD_TYPE_USER;
else if (g_strcmp0 (thread_type_string, "kernel") == 0)
thread_type = META_THREAD_TYPE_KERNEL;
else
g_assert_not_reached ();
}
kms = g_initable_new (META_TYPE_KMS, kms = g_initable_new (META_TYPE_KMS,
NULL, error, NULL, error,
"backend", backend, "backend", backend,
"name", "KMS thread", "name", "KMS thread",
"thread-type", META_THREAD_TYPE_USER, "thread-type", thread_type,
NULL); NULL);
kms->flags = flags; kms->flags = flags;