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perf db-export: Add trace begin / end branch type variants

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Add branch types to cover different combinations with "trace begin" or
"trace end".

Previously, the Intel PT decoder would indicate begin / end by a branch
from / to zero. That hides useful information, in particular when a
trace ends with a call. Before remedying that, prepare the database
export to export branch types with more combinations that include trace
begin / end.  In those cases extend the descriptions to include 'trace
begin' and 'trace end' separately.

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/20180920130048.31432-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-09-20 16:00:44 +03:00 committed by Arnaldo Carvalho de Melo
parent 62cb1b8868
commit ff645daf30
1 changed files with 22 additions and 0 deletions
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22
tools/perf/util/db-export.c
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@ -463,6 +463,28 @@ int db_export__branch_types(struct db_export *dbe)
if (err)
break;
}
/* Add trace begin / end variants */
for (i = 0; branch_types[i].name ; i++) {
const char *name = branch_types[i].name;
u32 type = branch_types[i].branch_type;
char buf[64];
if (type == PERF_IP_FLAG_BRANCH ||
(type & (PERF_IP_FLAG_TRACE_BEGIN | PERF_IP_FLAG_TRACE_END)))
continue;
snprintf(buf, sizeof(buf), "trace begin / %s", name);
err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_BEGIN, buf);
if (err)
break;
snprintf(buf, sizeof(buf), "%s / trace end", name);
err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_END, buf);
if (err)
break;
}
return err;
}