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This is to be consistent with what libtracefs does: https://github.com/rostedt/libtracefs/blob/6fad6a14ba0d4c4b437d9e4eed7098d4bb07b4fc/src/tracefs-utils.c#L104 In theory one may mount tracefs with another name, though unlikely.
…/systems that only mount debugfs
wolfpld
reviewed
Apr 20, 2026
wolfpld
reviewed
Apr 20, 2026
wolfpld
reviewed
Apr 20, 2026
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On older kernels and some systems (e.g. Android, embedded),
tracefsis not mounted directly but is accessible underdebugfsat<debugfs>/tracing. Users may also have been instructed to usesudo mount -t debugfs debugfs /sys/kernel/debug. Tracy would fail to find it and silently skip system tracing.mnt_fsnametomnt_type, consistent withlibtracefs. Atracefsmount with a custom source name (e.g.mount -t tracefs nodev /path) would previously be missed.tracefsmount is found, fall back to<debugfs>/tracingif debugfs is present. Continues iterating/proc/mountsafter a debugfs hit so a later tracefs entry still takes priority.SysTraceStartfails to help users diagnose missing systrace information.