perf intel-pt: Implement decoder flags for trace begin / end
Have the Intel PT decoder implement the new Intel PT decoder flags for
trace begin / end.
Previously, the decoder would indicate begin / end by a branch from / to
zero. That hides useful information, in particular when a trace ends
with a call. That happens when using address filters, for example:
$ perf record -e intel_pt/cyc,mtc_period=0,noretcomp/u --filter='filter main @ /bin/uname ' uname Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.031 MB perf.data ]
Before:
$ perf script --itrace=cre -Ftime,flags,ip,sym,symoff,addr --ns
7249.622183310: tr strt 0 [unknown] => 401590 main+0x0
7249.622183311: call 4015b9 main+0x29 => 0 [unknown]
7249.622183711: tr strt 0 [unknown] => 4015be main+0x2e
7249.622183714: call 4015c8 main+0x38 => 0 [unknown]
7249.622247731: tr strt 0 [unknown] => 4015cd main+0x3d
7249.622247760: call 4015d7 main+0x47 => 0 [unknown]
7249.622248340: tr strt 0 [unknown] => 4015dc main+0x4c
7249.622248341: call 4015e1 main+0x51 => 0 [unknown]
7249.622248681: tr strt 0 [unknown] => 4015e6 main+0x56
7249.622248682: call 4015eb main+0x5b => 0 [unknown]
7249.622248970: tr strt 0 [unknown] => 4015f0 main+0x60
7249.622248971: call 401612 main+0x82 => 0 [unknown]
7249.622249757: tr strt 0 [unknown] => 401617 main+0x87
7249.622249770: call 401847 main+0x2b7 => 0 [unknown]
7249.622250606: tr strt 0 [unknown] => 40184c main+0x2bc
7249.622250612: call 4019bf main+0x42f => 0 [unknown]
7249.622256823: tr strt 0 [unknown] => 4019c4 main+0x434
7249.622256863: call 4019f5 main+0x465 => 0 [unknown]
7249.622264217: tr strt 0 [unknown] => 4019fa main+0x46a
7249.622264235: call 401832 main+0x2a2 => 0 [unknown]
After:
$ perf script --itrace=cre -Ftime,flags,ip,sym,symoff,addr --ns
7249.622183310: tr strt 0 [unknown] => 401590 main+0x0
7249.622183311: tr end call 4015b9 main+0x29 => 401ef0 set_program_name+0x0
7249.622183711: tr strt 0 [unknown] => 4015be main+0x2e
7249.622183714: tr end call 4015c8 main+0x38 => 4014b0 setlocale@plt+0x0
7249.622247731: tr strt 0 [unknown] => 4015cd main+0x3d
7249.622247760: tr end call 4015d7 main+0x47 => 4012d0 bindtextdomain@plt+0x0
7249.622248340: tr strt 0 [unknown] => 4015dc main+0x4c
7249.622248341: tr end call 4015e1 main+0x51 => 4012b0 textdomain@plt+0x0
7249.622248681: tr strt 0 [unknown] => 4015e6 main+0x56
7249.622248682: tr end call 4015eb main+0x5b => 404340 atexit+0x0
7249.622248970: tr strt 0 [unknown] => 4015f0 main+0x60
7249.622248971: tr end call 401612 main+0x82 => 401320 getopt_long@plt+0x0
7249.622249757: tr strt 0 [unknown] => 401617 main+0x87
7249.622249770: tr end call 401847 main+0x2b7 => 401360 uname@plt+0x0
7249.622250606: tr strt 0 [unknown] => 40184c main+0x2bc
7249.622250612: tr end call 4019bf main+0x42f => 401b10 print_element+0x0
7249.622256823: tr strt 0 [unknown] => 4019c4 main+0x434
7249.622256863: tr end call 4019f5 main+0x465 => 401340 __overflow@plt+0x0
7249.622264217: tr strt 0 [unknown] => 4019fa main+0x46a
7249.622264235: tr end call 401832 main+0x2a2 => 401520 exit@plt+0x0
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20180920130048.31432-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
bea6385789