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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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10
builtin/commit-graph.c
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@ -11,7 +11,7 @@ static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph verify [--object-dir <objdir>] [--shallow] [--[no-]progress]"),
N_("git commit-graph write [--object-dir <objdir>] [--append] "
"[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
"[--[no-]progress] <split options>"),
"[--changed-paths] [--[no-]progress] <split options>"),
NULL
};
@ -23,7 +23,7 @@ static const char * const builtin_commit_graph_verify_usage[] = {
static const char * const builtin_commit_graph_write_usage[] = {
N_("git commit-graph write [--object-dir <objdir>] [--append] "
"[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
"[--[no-]progress] <split options>"),
"[--changed-paths] [--[no-]progress] <split options>"),
NULL
};
@ -36,6 +36,7 @@ static struct opts_commit_graph {
int split;
int shallow;
int progress;
int enable_changed_paths;
} opts;
static struct object_directory *find_odb(struct repository *r,
@ -158,6 +159,8 @@ static int graph_write(int argc, const char **argv)
N_("start walk at commits listed by stdin")),
OPT_BOOL(0, "append", &opts.append,
N_("include all commits already in the commit-graph file")),
OPT_BOOL(0, "changed-paths", &opts.enable_changed_paths,
N_("enable computation for changed paths")),
OPT_BOOL(0, "progress", &opts.progress, N_("force progress reporting")),
OPT_CALLBACK_F(0, "split", &split_opts.flags, NULL,
N_("allow writing an incremental commit-graph file"),
@ -193,6 +196,9 @@ static int graph_write(int argc, const char **argv)
flags |= COMMIT_GRAPH_WRITE_SPLIT;
if (opts.progress)
flags |= COMMIT_GRAPH_WRITE_PROGRESS;
if (opts.enable_changed_paths ||
git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
flags |= COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
read_replace_refs = 0;
odb = find_odb(the_repository, opts.obj_dir);