path: root/trace2/tr2_cmd_name.c
diff options
authorJeff Hostetler <>2019-02-22 22:25:01 (GMT)
committerJunio C Hamano <>2019-02-22 23:27:59 (GMT)
commitee4512ed481a126dadd33334186e0e759d7f2f47 (patch)
tree4bc0418115d44b1833c1d24d2ac1c92f067b7ad3 /trace2/tr2_cmd_name.c
parente544221d97a57a9be7ba18a0df52a15b4cc76f97 (diff)
trace2: create new combined trace facility
Create a new unified tracing facility for git. The eventual intent is to replace the current trace_printf* and trace_performance* routines with a unified set of git_trace2* routines. In addition to the usual printf-style API, trace2 provides higer-level event verbs with fixed-fields allowing structured data to be written. This makes post-processing and analysis easier for external tools. Trace2 defines 3 output targets. These are set using the environment variables "GIT_TR2", "GIT_TR2_PERF", and "GIT_TR2_EVENT". These may be set to "1" or to an absolute pathname (just like the current GIT_TRACE). * GIT_TR2 is intended to be a replacement for GIT_TRACE and logs command summary data. * GIT_TR2_PERF is intended as a replacement for GIT_TRACE_PERFORMANCE. It extends the output with columns for the command process, thread, repo, absolute and relative elapsed times. It reports events for child process start/stop, thread start/stop, and per-thread function nesting. * GIT_TR2_EVENT is a new structured format. It writes event data as a series of JSON records. Calls to trace2 functions log to any of the 3 output targets enabled without the need to call different trace_printf* or trace_performance* routines. Signed-off-by: Jeff Hostetler <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'trace2/tr2_cmd_name.c')
1 files changed, 30 insertions, 0 deletions
diff --git a/trace2/tr2_cmd_name.c b/trace2/tr2_cmd_name.c
new file mode 100644
index 0000000..e999592
--- /dev/null
+++ b/trace2/tr2_cmd_name.c
@@ -0,0 +1,30 @@
+#include "cache.h"
+#include "trace2/tr2_cmd_name.h"
+static struct strbuf tr2cmdname_hierarchy = STRBUF_INIT;
+void tr2_cmd_name_append_hierarchy(const char *name)
+ const char *parent_name = getenv(TR2_ENVVAR_PARENT_NAME);
+ strbuf_reset(&tr2cmdname_hierarchy);
+ if (parent_name && *parent_name) {
+ strbuf_addstr(&tr2cmdname_hierarchy, parent_name);
+ strbuf_addch(&tr2cmdname_hierarchy, '/');
+ }
+ strbuf_addstr(&tr2cmdname_hierarchy, name);
+ setenv(TR2_ENVVAR_PARENT_NAME, tr2cmdname_hierarchy.buf, 1);
+const char *tr2_cmd_name_get_hierarchy(void)
+ return tr2cmdname_hierarchy.buf;
+void tr2_cmd_name_release(void)
+ strbuf_release(&tr2cmdname_hierarchy);