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unpack-trees: add performance tracing 

We're going to optimize unpack_trees() a bit in the following
patches. Let's add some tracing to measure how long it takes before
and after. This is the baseline ("git checkout -" on webkit.git, 275k
files on worktree)

    performance: 0.056651714 s:  read cache .git/index
    performance: 0.183101080 s:  preload index
    performance: 0.008584433 s:  refresh index
    performance: 0.633767589 s:   traverse_trees
    performance: 0.340265448 s:   check_updates
    performance: 0.381884638 s:   cache_tree_update
    performance: 1.401562947 s:  unpack_trees
    performance: 0.338687914 s:  write index, changed mask = 2e
    performance: 0.411927922 s:    traverse_trees
    performance: 0.000023335 s:    check_updates
    performance: 0.423697246 s:   unpack_trees
    performance: 0.423708360 s:  diff-index
    performance: 2.559524127 s: git command: git checkout -

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2018-08-18 16:41:23 +02:00 committed by Junio C Hamano
parent c46c406ae1
commit 0d1ed5963d
2 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cache-tree.c
View File

@ -433,7 +433,9 @@ int cache_tree_update(struct index_state *istate, int flags)
if (i)
return i;
trace_performance_enter();
i = update_one(it, cache, entries, "", 0, &skip, flags);
trace_performance_leave("cache_tree_update");
if (i < 0)
return i;
istate->cache_changed |= CACHE_TREE_CHANGED;

9
unpack-trees.c
View File

@ -345,6 +345,7 @@ static int check_updates(struct unpack_trees_options *o)
struct checkout state = CHECKOUT_INIT;
int i;
trace_performance_enter();
state.force = 1;
state.quiet = 1;
state.refresh_cache = 1;
@ -414,6 +415,7 @@ static int check_updates(struct unpack_trees_options *o)
errs |= finish_delayed_checkout(&state);
if (o->update)
git_attr_set_direction(GIT_ATTR_CHECKIN, NULL);
trace_performance_leave("check_updates");
return errs != 0;
}
@ -1285,6 +1287,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
if (len > MAX_UNPACK_TREES)
die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
trace_performance_enter();
memset(&el, 0, sizeof(el));
if (!core_apply_sparse_checkout || !o->update)
o->skip_sparse_checkout = 1;
@ -1357,7 +1360,10 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
}
}
if (traverse_trees(len, t, &info) < 0)
trace_performance_enter();
ret = traverse_trees(len, t, &info);
trace_performance_leave("traverse_trees");
if (ret < 0)
goto return_failed;
}
@ -1449,6 +1455,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
o->src_index = NULL;
done:
trace_performance_leave("unpack_trees");
clear_exclude_list(&el);
return ret;