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https://github.com/git/git.git
synced 2024-05-23 11:26:09 +02:00
git-pickaxe: optimize by avoiding repeated read_sha1_file().
It turns out that pickaxe reads the same blob repeatedly while blame can reuse the blob already read for the parent when handling a child commit when it's parent's turn to pass its blame to the grandparent. Have a cache in the origin structure to keep the blob there, which will be garbage collected when the origin loses the last reference to it. Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
parent
2bc45477a5
commit
c2e525d97f
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@ -40,6 +40,11 @@ static int max_score_digits;
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#define DEBUG 0
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#endif
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/* stats */
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static int num_read_blob;
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static int num_get_patch;
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static int num_commits;
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#define PICKAXE_BLAME_MOVE 01
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#define PICKAXE_BLAME_COPY 02
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#define PICKAXE_BLAME_COPY_HARDER 04
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@ -63,10 +68,25 @@ static unsigned blame_copy_score;
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struct origin {
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int refcnt;
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struct commit *commit;
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mmfile_t file;
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unsigned char blob_sha1[20];
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char path[FLEX_ARRAY];
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};
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static char *fill_origin_blob(struct origin *o, mmfile_t *file)
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{
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if (!o->file.ptr) {
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char type[10];
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num_read_blob++;
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file->ptr = read_sha1_file(o->blob_sha1, type,
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(unsigned long *)(&(file->size)));
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o->file = *file;
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}
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else
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*file = o->file;
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return file->ptr;
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}
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static inline struct origin *origin_incref(struct origin *o)
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{
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if (o)
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@ -77,6 +97,8 @@ static inline struct origin *origin_incref(struct origin *o)
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static void origin_decref(struct origin *o)
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{
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if (o && --o->refcnt <= 0) {
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if (o->file.ptr)
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free(o->file.ptr);
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memset(o, 0, sizeof(*o));
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free(o);
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}
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@ -431,25 +453,14 @@ static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
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static struct patch *get_patch(struct origin *parent, struct origin *origin)
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{
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mmfile_t file_p, file_o;
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char type[10];
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char *blob_p, *blob_o;
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struct patch *patch;
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blob_p = read_sha1_file(parent->blob_sha1, type,
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(unsigned long *) &file_p.size);
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blob_o = read_sha1_file(origin->blob_sha1, type,
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(unsigned long *) &file_o.size);
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file_p.ptr = blob_p;
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file_o.ptr = blob_o;
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if (!file_p.ptr || !file_o.ptr) {
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free(blob_p);
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free(blob_o);
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fill_origin_blob(parent, &file_p);
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fill_origin_blob(origin, &file_o);
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if (!file_p.ptr || !file_o.ptr)
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return NULL;
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}
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patch = compare_buffer(&file_p, &file_o, 0);
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free(blob_p);
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free(blob_o);
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num_get_patch++;
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return patch;
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}
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@ -784,20 +795,14 @@ static int find_move_in_parent(struct scoreboard *sb,
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int last_in_target, made_progress;
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struct blame_entry *e, split[3];
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mmfile_t file_p;
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char type[10];
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char *blob_p;
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last_in_target = find_last_in_target(sb, target);
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if (last_in_target < 0)
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return 1; /* nothing remains for this target */
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blob_p = read_sha1_file(parent->blob_sha1, type,
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(unsigned long *) &file_p.size);
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file_p.ptr = blob_p;
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if (!file_p.ptr) {
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free(blob_p);
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fill_origin_blob(parent, &file_p);
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if (!file_p.ptr)
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return 0;
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}
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made_progress = 1;
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while (made_progress) {
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@ -814,7 +819,6 @@ static int find_move_in_parent(struct scoreboard *sb,
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decref_split(split);
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}
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}
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free(blob_p);
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return 0;
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}
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@ -900,8 +904,6 @@ static int find_copy_in_parent(struct scoreboard *sb,
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struct diff_filepair *p = diff_queued_diff.queue[i];
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struct origin *norigin;
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mmfile_t file_p;
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char type[10];
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char *blob;
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struct blame_entry this[3];
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if (!DIFF_FILE_VALID(p->one))
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@ -912,9 +914,7 @@ static int find_copy_in_parent(struct scoreboard *sb,
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norigin = get_origin(sb, parent, p->one->path);
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hashcpy(norigin->blob_sha1, p->one->sha1);
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blob = read_sha1_file(norigin->blob_sha1, type,
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(unsigned long *) &file_p.size);
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file_p.ptr = blob;
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fill_origin_blob(norigin, &file_p);
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if (!file_p.ptr)
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continue;
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@ -925,7 +925,6 @@ static int find_copy_in_parent(struct scoreboard *sb,
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this);
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decref_split(this);
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}
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free(blob);
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origin_decref(norigin);
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}
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@ -953,6 +952,28 @@ static int find_copy_in_parent(struct scoreboard *sb,
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return retval;
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}
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/* The blobs of origin and porigin exactly match, so everything
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* origin is suspected for can be blamed on the parent.
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*/
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static void pass_whole_blame(struct scoreboard *sb,
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struct origin *origin, struct origin *porigin)
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{
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struct blame_entry *e;
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if (!porigin->file.ptr && origin->file.ptr) {
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/* Steal its file */
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porigin->file = origin->file;
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origin->file.ptr = NULL;
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}
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for (e = sb->ent; e; e = e->next) {
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if (cmp_suspect(e->suspect, origin))
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continue;
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origin_incref(porigin);
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origin_decref(e->suspect);
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e->suspect = porigin;
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}
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}
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#define MAXPARENT 16
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static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
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@ -986,13 +1007,7 @@ static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
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if (!porigin)
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continue;
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if (!hashcmp(porigin->blob_sha1, origin->blob_sha1)) {
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struct blame_entry *e;
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for (e = sb->ent; e; e = e->next)
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if (e->suspect == origin) {
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origin_incref(porigin);
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origin_decref(e->suspect);
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e->suspect = porigin;
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}
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pass_whole_blame(sb, origin, porigin);
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origin_decref(porigin);
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goto finish;
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}
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@ -1010,6 +1025,7 @@ static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
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}
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}
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num_commits++;
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for (i = 0, parent = commit->parents;
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i < MAXPARENT && parent;
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parent = parent->next, i++) {
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@ -1068,7 +1084,8 @@ static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
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origin_incref(suspect);
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commit = suspect->commit;
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parse_commit(commit);
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if (!commit->object.parsed)
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parse_commit(commit);
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if (!(commit->object.flags & UNINTERESTING) &&
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!(revs->max_age != -1 && commit->date < revs->max_age))
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pass_blame(sb, suspect, opt);
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@ -1735,6 +1752,7 @@ int cmd_pickaxe(int argc, const char **argv, const char *prefix)
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die("no such path %s in %s", path, final_commit_name);
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sb.final_buf = read_sha1_file(o->blob_sha1, type, &sb.final_buf_size);
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num_read_blob++;
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lno = prepare_lines(&sb);
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if (bottom < 1)
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@ -1772,5 +1790,11 @@ int cmd_pickaxe(int argc, const char **argv, const char *prefix)
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free(ent);
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ent = e;
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}
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if (DEBUG) {
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printf("num read blob: %d\n", num_read_blob);
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printf("num get patch: %d\n", num_get_patch);
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printf("num commits: %d\n", num_commits);
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}
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return 0;
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}
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