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pack-bitmap-write.c: instrument number of reused bitmaps

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When debugging bitmap generation performance, it is useful to know how
many bitmaps were generated from scratch, and how many were the result
of permuting the bit-order of an existing bitmap.

Keep track of the latter, and emit the count as a trace2_data line to
aid in debugging.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2022-10-12 18:01:57 -04:00 committed by Junio C Hamano
parent 2dcff52524
commit e9c3839944
1 changed files with 7 additions and 1 deletions
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8
pack-bitmap-write.c
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@ -384,6 +384,8 @@ static int fill_bitmap_tree(struct bitmap *bitmap,
return 0; return 0;
} }
static int reused_bitmaps_nr;
static int fill_bitmap_commit(struct bb_commit *ent, static int fill_bitmap_commit(struct bb_commit *ent,
struct commit *commit, struct commit *commit,
struct prio_queue *queue, struct prio_queue *queue,
@ -409,9 +411,11 @@ static int fill_bitmap_commit(struct bb_commit *ent,
* bitmap and add its bits to this one. No need to walk * bitmap and add its bits to this one. No need to walk
* parents or the tree for this commit. * parents or the tree for this commit.
*/ */
if (old && !rebuild_bitmap(mapping, old, ent->bitmap)) if (old && !rebuild_bitmap(mapping, old, ent->bitmap)) {
reused_bitmaps_nr++;
continue; continue;
} }
}
/* /*
* Mark ourselves and queue our tree. The commit * Mark ourselves and queue our tree. The commit
@ -526,6 +530,8 @@ int bitmap_writer_build(struct packing_data *to_pack)
trace2_region_leave("pack-bitmap-write", "building_bitmaps_total", trace2_region_leave("pack-bitmap-write", "building_bitmaps_total",
the_repository); the_repository);
trace2_data_intmax("pack-bitmap-write", the_repository,
"building_bitmaps_reused", reused_bitmaps_nr);
stop_progress(&writer.progress); stop_progress(&writer.progress);