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fast-import optimization: 

Now that cmd_data acts on a strbuf, make last_object stashed buffer be a
strbuf as well. On new stash, don't free the last stashed buffer, rather
swap it with the one you will stash, this way, callers of store_object can
act on static strbufs, and at some point, fast-import won't allocate new
memory for objects buffers.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pierre Habouzit 2007-09-17 14:00:38 +02:00 committed by Junio C Hamano
parent eec813cfc6
commit 0557656930
1 changed files with 20 additions and 32 deletions
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52
fast-import.c
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@ -182,11 +182,10 @@ struct mark_set
struct last_object
{
void *data;
unsigned long len;
struct strbuf data;
uint32_t offset;
unsigned int depth;
unsigned no_free:1;
unsigned no_swap : 1;
};
struct mem_pool
@ -310,7 +309,7 @@ static struct mark_set *marks;
static const char* mark_file;
/* Our last blob */
static struct last_object last_blob;
static struct last_object last_blob = { STRBUF_INIT, 0, 0, 0 };
/* Tree management */
static unsigned int tree_entry_alloc = 1000;
@ -950,9 +949,7 @@ static void end_packfile(void)
free(old_p);
/* We can't carry a delta across packfiles. */
free(last_blob.data);
last_blob.data = NULL;
last_blob.len = 0;
strbuf_release(&last_blob.data);
last_blob.offset = 0;
last_blob.depth = 0;
}
@ -1024,8 +1021,8 @@ static int store_object(
return 1;
}
if (last && last->data && last->depth < max_depth) {
delta = diff_delta(last->data, last->len,
if (last && last->data.buf && last->depth < max_depth) {
delta = diff_delta(last->data.buf, last->data.len,
dat->buf, dat->len,
&deltalen, 0);
if (delta && deltalen >= dat->len) {
@ -1111,11 +1108,14 @@ static int store_object(
free(out);
free(delta);
if (last) {
if (!last->no_free)
free(last->data);
if (last->no_swap) {
last->data = *dat;
} else {
struct strbuf tmp = *dat;
*dat = last->data;
last->data = tmp;
}
last->offset = e->offset;
last->data = dat->buf;
last->len = dat->len;
}
return 0;
}
@ -1242,7 +1242,7 @@ static void store_tree(struct tree_entry *root)
{
struct tree_content *t = root->tree;
unsigned int i, j, del;
struct last_object lo;
struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
struct object_entry *le;
if (!is_null_sha1(root->versions[1].sha1))
@ -1254,19 +1254,11 @@ static void store_tree(struct tree_entry *root)
}
le = find_object(root->versions[0].sha1);
if (!S_ISDIR(root->versions[0].mode)
|| !le
|| le->pack_id != pack_id) {
lo.data = NULL;
lo.depth = 0;
lo.no_free = 0;
} else {
if (S_ISDIR(root->versions[0].mode) && le && le->pack_id == pack_id) {
mktree(t, 0, &old_tree);
lo.len = old_tree.len;
lo.data = old_tree.buf;
lo.data = old_tree;
lo.offset = le->offset;
lo.depth = t->delta_depth;
lo.no_free = 1;
}
mktree(t, 1, &new_tree);
@ -1714,14 +1706,12 @@ static char *parse_ident(const char *buf)
static void cmd_new_blob(void)
{
struct strbuf buf;
static struct strbuf buf = STRBUF_INIT;
read_next_command();
cmd_mark();
strbuf_init(&buf, 0);
cmd_data(&buf);
if (store_object(OBJ_BLOB, &buf, &last_blob, NULL, next_mark))
strbuf_release(&buf);
store_object(OBJ_BLOB, &buf, &last_blob, NULL, next_mark);
}
static void unload_one_branch(void)
@ -1817,15 +1807,13 @@ static void file_change_m(struct branch *b)
}
if (inline_data) {
struct strbuf buf;
static struct strbuf buf = STRBUF_INIT;
if (!p_uq)
p = p_uq = xstrdup(p);
read_next_command();
strbuf_init(&buf, 0);
cmd_data(&buf);
if (store_object(OBJ_BLOB, &buf, &last_blob, sha1, 0))
strbuf_release(&buf);
store_object(OBJ_BLOB, &buf, &last_blob, sha1, 0);
} else if (oe) {
if (oe->type != OBJ_BLOB)
die("Not a blob (actually a %s): %s",