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unpack-trees: add performance tracing

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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
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2
cache-tree.c
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@ -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;