[Bug record/30073] [intel Efficient-core] FAIL: gdb.btrace/exception.exp: flat (pattern 1)

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30073

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Markus Metzger from comment #5)
> On my system, I do not get any BTS records on E-cores, and the perf event
> head pointer does not move.  Looks like the BTS enable request gets stuck.
> 
> Could you print the result of 'maint btrace packet-history 0, +100'?

I've build without libipt, ran the test-case gdb.btrace/exception.exp, copied
outputs/gdb.btrace/exception/gdb.in.2 to gdb.in, edited it like so:
...
$ cat gdb.in
set height 0
set width 0
dir
dir /data/vries/gdb/src/gdb/testsuite/gdb.btrace
file
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.btrace/exception/exception
delete breakpoints
info breakpoints
break -qualified main
run 
set record function-call-history-size 0
break 56
break 59
continue
set record btrace bts buffer-size 128000
record btrace
continue
maint btrace packet-history 0, +100
#record function-call-history 1
#record function-call-history /c 1
...
and ran it:
...
$ gdb -q -batch -ex "set trace-commands on" -x gdb.in
+set height 0
+set width 0
+dir
+dir /data/vries/gdb/src/gdb/testsuite/gdb.btrace
+file
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.btrace/exception/exception
+delete breakpoints
+info breakpoints
No breakpoints or watchpoints.
+break -qualified main
Breakpoint 1 at 0x400768: file
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc, line 55.
+run 

Breakpoint 1, main () at
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc:55
55        test ();
+set record function-call-history-size 0
+break 56
Breakpoint 2 at 0x40076d: file
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc, line 56.
+break 59
Breakpoint 3 at 0x400779: file
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc, line 59.
+continue

Breakpoint 2, main () at
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc:56
56        test (); /* bp.1  */
+set record btrace bts buffer-size 128000
+record btrace
+target record-btrace
+target record-btrace
+continue

Breakpoint 3, main () at
/data/vries/gdb/src/gdb/testsuite/gdb.btrace/exception.cc:59
59        return ret; /* bp.2  */
+maint btrace packet-history 0, +100
No trace.
...

I hope that answers your question.

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