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fsck: avoid reading every object twice

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During verify_pack() all objects are read for SHA-1 check. Then
fsck_sha1() is called on every object, which read the object again
(fsck_sha1 -> parse_object -> read_sha1_file).

Avoid reading an object twice, do fsck_sha1 while we have an object
uncompressed data in verify_pack.

On git.git, with this patch I got:

$ /usr/bin/time ./git fsck >/dev/null
98.97user 0.90system 1:40.01elapsed 99%CPU (0avgtext+0avgdata 616624maxresident)k
0inputs+0outputs (0major+194186minor)pagefaults 0swaps

Without it:

$ /usr/bin/time ./git fsck >/dev/null
231.23user 2.35system 3:53.82elapsed 99%CPU (0avgtext+0avgdata 636688maxresident)k
0inputs+0outputs (0major+461629minor)pagefaults 0swaps

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
2011-11-07 09:59:25 +07:00
committed by Junio C Hamano
parent 473935188c
commit c9486eb04d
3 changed files with 39 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
pack-check.c
View File

@@ -42,7 +42,8 @@ int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
}
static int verify_packfile(struct packed_git *p,
struct pack_window **w_curs)
struct pack_window **w_curs,
verify_fn fn)
{
off_t index_size = p->index_size;
const unsigned char *index_base = p->index_data;
@@ -120,6 +121,12 @@ static int verify_packfile(struct packed_git *p,
else if (check_sha1_signature(entries[i].sha1, data, size, typename(type)))
err = error("packed %s from %s is corrupt",
sha1_to_hex(entries[i].sha1), p->pack_name);
else if (fn) {
int eaten = 0;
fn(entries[i].sha1, type, size, data, &eaten);
if (eaten)
data = NULL;
}
free(data);
}
free(entries);
@@ -150,7 +157,7 @@ int verify_pack_index(struct packed_git *p)
return err;
}
int verify_pack(struct packed_git *p)
int verify_pack(struct packed_git *p, verify_fn fn)
{
int err = 0;
struct pack_window *w_curs = NULL;
@@ -159,7 +166,7 @@ int verify_pack(struct packed_git *p)
if (!p->index_data)
return -1;
err |= verify_packfile(p, &w_curs);
err |= verify_packfile(p, &w_curs, fn);
unuse_pack(&w_curs);
return err;