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Reuse the same buffer for all commits/tags in fast-import.

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Since most commits and tag objects are around the same size and we
only generate one at a time we can reuse the same buffer rather than
xmalloc'ing and free'ing the buffer every time we generate a commit.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2006-08-28 13:15:48 -04:00
parent e2eb469d1f
commit 243f801d1d
1 changed files with 23 additions and 20 deletions
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43
fast-import.c
View file

@ -267,6 +267,7 @@ static struct tag *last_tag;
/* Input stream parsing */
static struct strbuf command_buf;
static unsigned long next_mark;
static struct dbuf new_data;
static FILE* branch_log;
@ -381,6 +382,17 @@ static char* pool_strdup(const char *s)
return r;
}
static void size_dbuf(struct dbuf *b, size_t maxlen)
{
if (b->buffer) {
if (b->capacity >= maxlen)
return;
free(b->buffer);
}
b->capacity = ((maxlen / 1024) + 1) * 1024;
b->buffer = xmalloc(b->capacity);
}
static void insert_mark(unsigned long idnum, struct object_entry *oe)
{
struct mark_set *s = marks;
@ -925,15 +937,7 @@ static void mktree(struct tree_content *t,
maxlen += t->entries[i]->name->str_len + 34;
}
if (b->buffer) {
if (b->capacity < maxlen)
b->capacity = ((maxlen / 1024) + 1) * 1024;
b->buffer = xrealloc(b->buffer, b->capacity);
} else {
b->capacity = ((maxlen / 1024) + 1) * 1024;
b->buffer = xmalloc(b->capacity);
}
size_dbuf(b, maxlen);
c = b->buffer;
for (i = 0; i < t->entry_count; i++) {
struct tree_entry *e = t->entries[i];
@ -1515,7 +1519,6 @@ static void cmd_new_commit()
char *sp;
char *author = NULL;
char *committer = NULL;
char *body;
/* Obtain the branch name from the rest of our command */
sp = strchr(command_buf.buf, ' ') + 1;
@ -1568,11 +1571,11 @@ static void cmd_new_commit()
/* build the tree and the commit */
store_tree(&b->branch_tree);
body = xmalloc(97 + msglen
size_dbuf(&new_data, 97 + msglen
+ (author
? strlen(author) + strlen(committer)
: 2 * strlen(committer)));
sp = body;
sp = new_data.buffer;
sp += sprintf(sp, "tree %s\n",
sha1_to_hex(b->branch_tree.versions[1].sha1));
if (!is_null_sha1(b->sha1))
@ -1589,8 +1592,9 @@ static void cmd_new_commit()
free(committer);
free(msg);
store_object(OBJ_COMMIT, body, sp - body, NULL, b->sha1, next_mark);
free(body);
store_object(OBJ_COMMIT,
new_data.buffer, sp - (char*)new_data.buffer,
NULL, b->sha1, next_mark);
b->last_commit = object_count_by_type[OBJ_COMMIT];
if (branch_log) {
@ -1616,7 +1620,6 @@ static void cmd_new_tag()
struct branch *s;
void *msg;
size_t msglen;
char *body;
struct tag *t;
unsigned long from_mark = 0;
unsigned char sha1[20];
@ -1688,8 +1691,8 @@ static void cmd_new_tag()
msg = cmd_data(&msglen);
/* build the tag object */
body = xmalloc(67 + strlen(t->name) + strlen(tagger) + msglen);
sp = body;
size_dbuf(&new_data, 67+strlen(t->name)+strlen(tagger)+msglen);
sp = new_data.buffer;
sp += sprintf(sp, "object %s\n", sha1_to_hex(sha1));
sp += sprintf(sp, "type %s\n", type_names[OBJ_COMMIT]);
sp += sprintf(sp, "tag %s\n", t->name);
@ -1699,8 +1702,8 @@ static void cmd_new_tag()
free(tagger);
free(msg);
store_object(OBJ_TAG, body, sp - body, NULL, t->sha1, 0);
free(body);
store_object(OBJ_TAG, new_data.buffer, sp - (char*)new_data.buffer,
NULL, t->sha1, 0);
if (branch_log) {
int need_dq = quote_c_style(t->name, NULL, NULL, 0);
@ -1749,7 +1752,7 @@ int main(int argc, const char **argv)
{
const char *base_name;
int i;
unsigned long est_obj_cnt = 1000;
unsigned long est_obj_cnt = object_entry_alloc;
char *pack_name;
char *idx_name;
struct stat sb;