trace2:data: pack-objects: add trace2 regions

When studying the performance of 'git push' we would like to know
how much time is spent at various parts of the command. One area
that could cause performance trouble is 'git pack-objects'.

Add trace2 regions around the three main actions taken in this
command:

1. Enumerate objects.
2. Prepare pack.
3. Write pack-file.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index a9fac7c128c1eb45026965a79db1387a8bdb92de..a154fc29f6b7841c2417ca302b631437e7376baa 100644 (file)
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -33,6 +33,7 @@
 #include "object-store.h"
 #include "dir.h"
 #include "midx.h"
+#include "trace2.h"
 
 #define IN_PACK(obj) oe_in_pack(&to_pack, obj)
 #define SIZE(obj) oe_size(&to_pack, obj)
@@ -3473,6 +3474,8 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                }
        }
 
+       trace2_region_enter("pack-objects", "enumerate-objects",
+                           the_repository);
        prepare_packing_data(the_repository, &to_pack);
 
        if (progress)
@@ -3487,12 +3490,23 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
        if (include_tag && nr_result)
                for_each_ref(add_ref_tag, NULL);
        stop_progress(&progress_state);
+       trace2_region_leave("pack-objects", "enumerate-objects",
+                           the_repository);
 
        if (non_empty && !nr_result)
                return 0;
-       if (nr_result)
+       if (nr_result) {
+               trace2_region_enter("pack-objects", "prepare-pack",
+                                   the_repository);
                prepare_pack(window, depth);
+               trace2_region_leave("pack-objects", "prepare-pack",
+                                   the_repository);
+       }
+
+       trace2_region_enter("pack-objects", "write-pack-file", the_repository);
        write_pack_file();
+       trace2_region_leave("pack-objects", "write-pack-file", the_repository);
+
        if (progress)
                fprintf_ln(stderr,
                           _("Total %"PRIu32" (delta %"PRIu32"),"