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commit-graph: replace packed_oid_list with oid_array 

Our custom packed_oid_list data structure is really just an oid_array in
disguise. Let's switch to using the generic structure, which shortens
and simplifies the code slightly.

There's one slightly awkward part: in the old code we copied a hash
straight from the mmap'd on-disk data into the final object_id. And now
we'll copy to a temporary oid, which we'll then pass to
oid_array_append(). But this is an operation we have to do all over the
commit-graph code already, since it mostly uses object_id structs
internally. I also measured "git commit-graph --append", which triggers
this code path, and it showed no difference.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-12-07 14:11:05 -05:00 committed by Junio C Hamano
parent 1cbdbf3bef
commit a5f1c44899
1 changed files with 15 additions and 47 deletions
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62
commit-graph.c
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@ -936,17 +936,11 @@ struct packed_commit_list {
int alloc;
};
struct packed_oid_list {
struct object_id *list;
int nr;
int alloc;
};
struct write_commit_graph_context {
struct repository *r;
struct object_directory *odb;
char *graph_name;
struct packed_oid_list oids;
struct oid_array oids;
struct packed_commit_list commits;
int num_extra_edges;
unsigned long approx_nr_objects;
@ -1240,13 +1234,6 @@ static int write_graph_chunk_bloom_data(struct hashfile *f,
return 0;
}
static int oid_compare(const void *_a, const void *_b)
{
const struct object_id *a = (const struct object_id *)_a;
const struct object_id *b = (const struct object_id *)_b;
return oidcmp(a, b);
}
static int add_packed_commits(const struct object_id *oid,
struct packed_git *pack,
uint32_t pos,
@ -1267,10 +1254,7 @@ static int add_packed_commits(const struct object_id *oid,
if (type != OBJ_COMMIT)
return 0;
ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
ctx->oids.nr++;
oid_array_append(&ctx->oids, oid);
set_commit_pos(ctx->r, oid);
return 0;
@ -1281,9 +1265,7 @@ static void add_missing_parents(struct write_commit_graph_context *ctx, struct c
struct commit_list *parent;
for (parent = commit->parents; parent; parent = parent->next) {
if (!(parent->item->object.flags & REACHABLE)) {
ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
ctx->oids.nr++;
oid_array_append(&ctx->oids, &parent->item->object.oid);
parent->item->object.flags |= REACHABLE;
}
}
@ -1302,7 +1284,7 @@ static void close_reachable(struct write_commit_graph_context *ctx)
ctx->oids.nr);
for (i = 0; i < ctx->oids.nr; i++) {
display_progress(ctx->progress, i + 1);
commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
commit = lookup_commit(ctx->r, &ctx->oids.oid[i]);
if (commit)
commit->object.flags |= REACHABLE;
}
@ -1319,7 +1301,7 @@ static void close_reachable(struct write_commit_graph_context *ctx)
0);
for (i = 0; i < ctx->oids.nr; i++) {
display_progress(ctx->progress, i + 1);
commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
commit = lookup_commit(ctx->r, &ctx->oids.oid[i]);
if (!commit)
continue;
@ -1339,7 +1321,7 @@ static void close_reachable(struct write_commit_graph_context *ctx)
ctx->oids.nr);
for (i = 0; i < ctx->oids.nr; i++) {
display_progress(ctx->progress, i + 1);
commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
commit = lookup_commit(ctx->r, &ctx->oids.oid[i]);
if (commit)
commit->object.flags &= ~REACHABLE;
@ -1567,9 +1549,7 @@ static int fill_oids_from_commits(struct write_commit_graph_context *ctx,
oidset_iter_init(commits, &iter);
while ((oid = oidset_iter_next(&iter))) {
ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
oidcpy(&ctx->oids.list[ctx->oids.nr], oid);
ctx->oids.nr++;
oid_array_append(&ctx->oids, oid);
}
return 0;
@ -1599,16 +1579,14 @@ static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
ctx->progress = start_delayed_progress(
_("Finding extra edges in commit graph"),
ctx->oids.nr);
QSORT(ctx->oids.list, ctx->oids.nr, oid_compare);
for (i = 0; i < ctx->oids.nr; i++) {
oid_array_sort(&ctx->oids);
for (i = 0; i < ctx->oids.nr; i = oid_array_next_unique(&ctx->oids, i)) {
unsigned int num_parents;
display_progress(ctx->progress, i + 1);
if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
continue;
ALLOC_GROW(ctx->commits.list, ctx->commits.nr + 1, ctx->commits.alloc);
ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.oid[i]);
if (ctx->split && flags != COMMIT_GRAPH_SPLIT_REPLACE &&
commit_graph_position(ctx->commits.list[ctx->commits.nr]) != COMMIT_NOT_FROM_GRAPH)
@ -2199,26 +2177,16 @@ int write_commit_graph(struct object_directory *odb,
}
ctx->approx_nr_objects = approximate_object_count();
ctx->oids.alloc = ctx->approx_nr_objects / 32;
if (ctx->split && opts && ctx->oids.alloc > opts->max_commits)
ctx->oids.alloc = opts->max_commits;
if (ctx->append) {
if (ctx->append)
prepare_commit_graph_one(ctx->r, ctx->odb);
if (ctx->r->objects->commit_graph)
ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
}
if (ctx->oids.alloc < 1024)
ctx->oids.alloc = 1024;
ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
if (ctx->append && ctx->r->objects->commit_graph) {
struct commit_graph *g = ctx->r->objects->commit_graph;
for (i = 0; i < g->num_commits; i++) {
const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
struct object_id oid;
hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * i);
oid_array_append(&ctx->oids, &oid);
}
}
@ -2274,7 +2242,7 @@ int write_commit_graph(struct object_directory *odb,
cleanup:
free(ctx->graph_name);
free(ctx->commits.list);
free(ctx->oids.list);
oid_array_clear(&ctx->oids);
if (ctx->commit_graph_filenames_after) {
for (i = 0; i < ctx->num_commit_graphs_after; i++) {