pack-write: skip *.rev work when not writing *.rev

Fix a performance regression introduced in a587b5a786 (pack-write.c:
extract 'write_rev_file_order', 2021-03-30) and stop needlessly
allocating the "pack_order" array and sorting it with
"pack_order_cmp()", only to throw that work away when we discover that
we're not writing *.rev files after all.

This redundant work was not present in the original version of this
code added in 8ef50d9958 (pack-write.c: prepare to write 'pack-*.rev'
files, 2021-01-25). There we'd call write_rev_file() from
e.g. finish_tmp_packfile(), but we'd "return NULL" early in
write_rev_file() if not doing a "WRITE_REV" or "WRITE_REV_VERIFY".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
pull/1093/head
Ævar Arnfjörð Bjarmason 1 year ago committed by Junio C Hamano
parent ebf3c04b26
commit 8fe8bae9d2
  1. 3
      pack-write.c

@ -224,6 +224,9 @@ const char *write_rev_file(const char *rev_name,
uint32_t i;
const char *ret;
if (!(flags & WRITE_REV) && !(flags & WRITE_REV_VERIFY))
return NULL;
ALLOC_ARRAY(pack_order, nr_objects);
for (i = 0; i < nr_objects; i++)
pack_order[i] = i;

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