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Markus Metzger 88711fbfea btrace: check perf_event_paranoid
One recurring error on Debian systems is that the default perf_event_paranoid
setting disables the perf_event interface for user-space.

Check the current level and point the user to the file.

gdb/
	* nat/linux-btrace.c (diagnose_perf_event_open_fail): New.
	(linux_enable_pt, linux_enable_bts): Call
	diagnose_perf_event_open_fail.
2018-02-09 14:03:21 +01:00
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