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Merge branch 'gs/commit-graph-path-filter'

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Introduce an extension to the commit-graph to make it efficient to
check for the paths that were modified at each commit using Bloom
filters.

* gs/commit-graph-path-filter:
  bloom: ignore renames when computing changed paths
  commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag
  t4216: add end to end tests for git log with Bloom filters
  revision.c: add trace2 stats around Bloom filter usage
  revision.c: use Bloom filters to speed up path based revision walks
  commit-graph: add --changed-paths option to write subcommand
  commit-graph: reuse existing Bloom filters during write
  commit-graph: write Bloom filters to commit graph file
  commit-graph: examine commits by generation number
  commit-graph: examine changed-path objects in pack order
  commit-graph: compute Bloom filters for changed paths
  diff: halt tree-diff early after max_changes
  bloom.c: core Bloom filter implementation for changed paths.
  bloom.c: introduce core Bloom filter constructs
  bloom.c: add the murmur3 hash implementation
  commit-graph: define and use MAX_NUM_CHUNKS
This commit is contained in:
Junio C Hamano
2020-05-01 13:39:53 -07:00
parent cf054f817a caf388caa1
commit 9b6606f43d
22 changed files with 1140 additions and 11 deletions
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9
commit-graph.h
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@ -10,8 +10,10 @@
#define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
#define GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD "GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD"
#define GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS "GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS"
struct commit;
struct bloom_filter_settings;
char *get_commit_graph_filename(struct object_directory *odb);
int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
@ -58,6 +60,10 @@ struct commit_graph {
const unsigned char *chunk_commit_data;
const unsigned char *chunk_extra_edges;
const unsigned char *chunk_base_graphs;
const unsigned char *chunk_bloom_indexes;
const unsigned char *chunk_bloom_data;
struct bloom_filter_settings *bloom_filter_settings;
};
struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
@ -77,7 +83,8 @@ enum commit_graph_write_flags {
COMMIT_GRAPH_WRITE_PROGRESS = (1 << 1),
COMMIT_GRAPH_WRITE_SPLIT = (1 << 2),
/* Make sure that each OID in the input is a valid commit OID. */
COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3)
COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3),
COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 4),
};
enum commit_graph_split_flags {