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trace.h: support nested performance tracing

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Performance measurements are listed right now as a flat list, which is
fine when we measure big blocks. But when we start adding more and
more measurements, some of them could be just part of a bigger
measurement and a flat list gives a wrong impression that they are
executed at the same level instead of nested.

Add trace_performance_enter() and trace_performance_leave() to allow
indent these nested measurements. For now it does not help much
because the only nested thing is (lazy) name hash initialization
(e.g. called in diff-index from "git status"). This will help more
because I'm going to add some more tracing that's actually nested.

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 16:41:22 +02:00
committed by Junio C Hamano
parent fa03cdc39b
commit c46c406ae1
7 changed files with 96 additions and 20 deletions
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4
diff-lib.c
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@ -518,11 +518,11 @@ static int diff_cache(struct rev_info *revs,
int run_diff_index(struct rev_info *revs, int cached)
{
struct object_array_entry *ent;
uint64_t start = getnanotime();
if (revs->pending.nr != 1)
BUG("run_diff_index must be passed exactly one tree");
trace_performance_enter();
ent = revs->pending.objects;
if (diff_cache(revs, &ent->item->oid, ent->name, cached))
exit(128);
@ -531,7 +531,7 @@ int run_diff_index(struct rev_info *revs, int cached)
diffcore_fix_diff_index(&revs->diffopt);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
trace_performance_since(start, "diff-index");
trace_performance_leave("diff-index");
return 0;
}