diff options
| -rw-r--r-- | Documentation/config/pack.txt | 4 | ||||
| -rw-r--r-- | builtin/multi-pack-index.c | 21 | ||||
| -rw-r--r-- | midx.c | 6 | ||||
| -rw-r--r-- | midx.h | 1 | ||||
| -rw-r--r-- | pack-bitmap.c | 41 | ||||
| -rw-r--r-- | pack-bitmap.h | 1 | ||||
| -rw-r--r-- | t/helper/test-bitmap.c | 10 | ||||
| -rwxr-xr-x | t/perf/p5326-multi-pack-bitmaps.sh | 15 | ||||
| -rwxr-xr-x | t/t5326-multi-pack-bitmaps.sh | 30 |
9 files changed, 118 insertions, 11 deletions
diff --git a/Documentation/config/pack.txt b/Documentation/config/pack.txt index 763f7af7c4..ad7f73a1ea 100644 --- a/Documentation/config/pack.txt +++ b/Documentation/config/pack.txt @@ -159,6 +159,10 @@ pack.writeBitmapHashCache:: between an older, bitmapped pack and objects that have been pushed since the last gc). The downside is that it consumes 4 bytes per object of disk space. Defaults to true. ++ +When writing a multi-pack reachability bitmap, no new namehashes are +computed; instead, any namehashes stored in an existing bitmap are +permuted into their appropriate location when writing a new bitmap. pack.writeReverseIndex:: When true, git will write a corresponding .rev file (see: diff --git a/builtin/multi-pack-index.c b/builtin/multi-pack-index.c index 0fb2439b0f..6426bbdace 100644 --- a/builtin/multi-pack-index.c +++ b/builtin/multi-pack-index.c @@ -60,6 +60,23 @@ static struct option *add_common_options(struct option *prev) return parse_options_concat(common_opts, prev); } +static int git_multi_pack_index_write_config(const char *var, const char *value, + void *cb) +{ + if (!strcmp(var, "pack.writebitmaphashcache")) { + if (git_config_bool(var, value)) + opts.flags |= MIDX_WRITE_BITMAP_HASH_CACHE; + else + opts.flags &= ~MIDX_WRITE_BITMAP_HASH_CACHE; + } + + /* + * We should never make a fall-back call to 'git_default_config', since + * this was already called in 'cmd_multi_pack_index()'. + */ + return 0; +} + static int cmd_multi_pack_index_write(int argc, const char **argv) { struct option *options; @@ -74,6 +91,10 @@ static int cmd_multi_pack_index_write(int argc, const char **argv) OPT_END(), }; + opts.flags |= MIDX_WRITE_BITMAP_HASH_CACHE; + + git_config(git_multi_pack_index_write_config, NULL); + options = add_common_options(builtin_multi_pack_index_write_options); trace2_cmd_mode(argv[0]); @@ -993,9 +993,13 @@ static int write_midx_bitmap(char *midx_name, unsigned char *midx_hash, struct pack_idx_entry **index; struct commit **commits = NULL; uint32_t i, commits_nr; + uint16_t options = 0; char *bitmap_name = xstrfmt("%s-%s.bitmap", midx_name, hash_to_hex(midx_hash)); int ret; + if (flags & MIDX_WRITE_BITMAP_HASH_CACHE) + options |= BITMAP_OPT_HASH_CACHE; + prepare_midx_packing_data(&pdata, ctx); commits = find_commits_for_midx_bitmap(&commits_nr, ctx); @@ -1034,7 +1038,7 @@ static int write_midx_bitmap(char *midx_name, unsigned char *midx_hash, goto cleanup; bitmap_writer_set_checksum(midx_hash); - bitmap_writer_finish(index, pdata.nr_objects, bitmap_name, 0); + bitmap_writer_finish(index, pdata.nr_objects, bitmap_name, options); cleanup: free(index); @@ -44,6 +44,7 @@ struct multi_pack_index { #define MIDX_PROGRESS (1 << 0) #define MIDX_WRITE_REV_INDEX (1 << 1) #define MIDX_WRITE_BITMAP (1 << 2) +#define MIDX_WRITE_BITMAP_HASH_CACHE (1 << 3) const unsigned char *get_midx_checksum(struct multi_pack_index *m); char *get_midx_filename(const char *object_dir); diff --git a/pack-bitmap.c b/pack-bitmap.c index 8504110a4d..33a3732992 100644 --- a/pack-bitmap.c +++ b/pack-bitmap.c @@ -1742,6 +1742,33 @@ int test_bitmap_commits(struct repository *r) return 0; } +int test_bitmap_hashes(struct repository *r) +{ + struct bitmap_index *bitmap_git = prepare_bitmap_git(r); + struct object_id oid; + uint32_t i, index_pos; + + if (!bitmap_git->hashes) + goto cleanup; + + for (i = 0; i < bitmap_num_objects(bitmap_git); i++) { + if (bitmap_is_midx(bitmap_git)) + index_pos = pack_pos_to_midx(bitmap_git->midx, i); + else + index_pos = pack_pos_to_index(bitmap_git->pack, i); + + nth_bitmap_object_oid(bitmap_git, &oid, index_pos); + + printf("%s %"PRIu32"\n", + oid_to_hex(&oid), get_be32(bitmap_git->hashes + index_pos)); + } + +cleanup: + free_bitmap_index(bitmap_git); + + return 0; +} + int rebuild_bitmap(const uint32_t *reposition, struct ewah_bitmap *source, struct bitmap *dest) @@ -1791,18 +1818,20 @@ uint32_t *create_bitmap_mapping(struct bitmap_index *bitmap_git, for (i = 0; i < num_objects; ++i) { struct object_id oid; struct object_entry *oe; + uint32_t index_pos; if (bitmap_is_midx(bitmap_git)) - nth_midxed_object_oid(&oid, - bitmap_git->midx, - pack_pos_to_midx(bitmap_git->midx, i)); + index_pos = pack_pos_to_midx(bitmap_git->midx, i); else - nth_packed_object_id(&oid, bitmap_git->pack, - pack_pos_to_index(bitmap_git->pack, i)); + index_pos = pack_pos_to_index(bitmap_git->pack, i); + nth_bitmap_object_oid(bitmap_git, &oid, index_pos); oe = packlist_find(mapping, &oid); - if (oe) + if (oe) { reposition[i] = oe_in_pack_pos(mapping, oe) + 1; + if (bitmap_git->hashes && !oe->hash) + oe->hash = get_be32(bitmap_git->hashes + index_pos); + } } return reposition; diff --git a/pack-bitmap.h b/pack-bitmap.h index 469090bad2..ed46d27077 100644 --- a/pack-bitmap.h +++ b/pack-bitmap.h @@ -52,6 +52,7 @@ void traverse_bitmap_commit_list(struct bitmap_index *, show_reachable_fn show_reachable); void test_bitmap_walk(struct rev_info *revs); int test_bitmap_commits(struct repository *r); +int test_bitmap_hashes(struct repository *r); struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs, struct list_objects_filter_options *filter, int filter_provided_objects); diff --git a/t/helper/test-bitmap.c b/t/helper/test-bitmap.c index 134a1e9d76..ff35f5999b 100644 --- a/t/helper/test-bitmap.c +++ b/t/helper/test-bitmap.c @@ -7,6 +7,11 @@ static int bitmap_list_commits(void) return test_bitmap_commits(the_repository); } +static int bitmap_dump_hashes(void) +{ + return test_bitmap_hashes(the_repository); +} + int cmd__bitmap(int argc, const char **argv) { setup_git_directory(); @@ -16,9 +21,12 @@ int cmd__bitmap(int argc, const char **argv) if (!strcmp(argv[1], "list-commits")) return bitmap_list_commits(); + if (!strcmp(argv[1], "dump-hashes")) + return bitmap_dump_hashes(); usage: - usage("\ttest-tool bitmap list-commits"); + usage("\ttest-tool bitmap list-commits\n" + "\ttest-tool bitmap dump-hashes"); return -1; } diff --git a/t/perf/p5326-multi-pack-bitmaps.sh b/t/perf/p5326-multi-pack-bitmaps.sh index 5845109ac7..f2fa228f16 100755 --- a/t/perf/p5326-multi-pack-bitmaps.sh +++ b/t/perf/p5326-multi-pack-bitmaps.sh @@ -6,15 +6,24 @@ test_description='Tests performance using midx bitmaps' test_perf_large_repo -test_expect_success 'enable multi-pack index' ' - git config core.multiPackIndex true +# we need to create the tag up front such that it is covered by the repack and +# thus by generated bitmaps. +test_expect_success 'create tags' ' + git tag --message="tag pointing to HEAD" perf-tag HEAD +' + +test_expect_success 'start with bitmapped pack' ' + git repack -adb ' test_perf 'setup multi-pack index' ' - git repack -ad && git multi-pack-index write --bitmap ' +test_expect_success 'drop pack bitmap' ' + rm -f .git/objects/pack/pack-*.bitmap +' + test_full_bitmap test_expect_success 'create partial bitmap state' ' diff --git a/t/t5326-multi-pack-bitmaps.sh b/t/t5326-multi-pack-bitmaps.sh index 4ad7c2c969..ec4aa89f63 100755 --- a/t/t5326-multi-pack-bitmaps.sh +++ b/t/t5326-multi-pack-bitmaps.sh @@ -283,4 +283,34 @@ test_expect_success 'pack.preferBitmapTips' ' ) ' +test_expect_success 'hash-cache values are propagated from pack bitmaps' ' + rm -fr repo && + git init repo && + test_when_finished "rm -fr repo" && + ( + cd repo && + + test_commit base && + test_commit base2 && + git repack -adb && + + test-tool bitmap dump-hashes >pack.raw && + test_file_not_empty pack.raw && + sort pack.raw >pack.hashes && + + test_commit new && + git repack && + git multi-pack-index write --bitmap && + + test-tool bitmap dump-hashes >midx.raw && + sort midx.raw >midx.hashes && + + # ensure that every namehash in the pack bitmap can be found in + # the midx bitmap (i.e., that there are no oid-namehash pairs + # unique to the pack bitmap). + comm -23 pack.hashes midx.hashes >dropped.hashes && + test_must_be_empty dropped.hashes + ) +' + test_done |