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authorNicolas Pitre <nico@cam.org>2005-05-06 17:48:34 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-06 18:02:01 (GMT)
commitbd2c39f58f915af532b488c5bda753314f0db603 (patch)
tree8c1e85a4af5d77cff94fc2703c271bbfc512778e /commit.c
parentf4f21ce367a5119be1c4396d01271ece6e40ff70 (diff)
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[PATCH] don't load and decompress objects twice with parse_object()
It turns out that parse_object() is loading and decompressing given object to free it just before calling the specific object parsing function which does mmap and decompress the same object again. This patch introduces the ability to parse specific objects directly from a memory buffer. Without this patch, running git-fsck-cache on the kernel repositorytake: real 0m13.006s user 0m11.421s sys 0m1.218s With this patch applied: real 0m8.060s user 0m7.071s sys 0m0.710s The performance increase is significant, and this is kind of a prerequisite for sane delta object support with fsck. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'commit.c')
-rw-r--r--commit.c40
1 files changed, 26 insertions, 14 deletions
diff --git a/commit.c b/commit.c
index b45118a..706c7cb 100644
--- a/commit.c
+++ b/commit.c
@@ -41,24 +41,14 @@ static unsigned long parse_commit_date(const char *buf)
return date;
}
-int parse_commit(struct commit *item)
+int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
{
- char type[20];
- void * buffer, *bufptr;
- unsigned long size;
+ void *bufptr = buffer;
unsigned char parent[20];
+
if (item->object.parsed)
return 0;
item->object.parsed = 1;
- buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
- if (!buffer)
- return error("Could not read %s",
- sha1_to_hex(item->object.sha1));
- if (strcmp(type, commit_type)) {
- free(buffer);
- return error("Object %s not a commit",
- sha1_to_hex(item->object.sha1));
- }
get_sha1_hex(bufptr + 5, parent);
item->tree = lookup_tree(parent);
if (item->tree)
@@ -74,10 +64,32 @@ int parse_commit(struct commit *item)
bufptr += 48;
}
item->date = parse_commit_date(bufptr);
- free(buffer);
return 0;
}
+int parse_commit(struct commit *item)
+{
+ char type[20];
+ void *buffer;
+ unsigned long size;
+ int ret;
+
+ if (item->object.parsed)
+ return 0;
+ buffer = read_sha1_file(item->object.sha1, type, &size);
+ if (!buffer)
+ return error("Could not read %s",
+ sha1_to_hex(item->object.sha1));
+ if (strcmp(type, commit_type)) {
+ free(buffer);
+ return error("Object %s not a commit",
+ sha1_to_hex(item->object.sha1));
+ }
+ ret = parse_commit_buffer(item, buffer, size);
+ free(buffer);
+ return ret;
+}
+
void commit_list_insert(struct commit *item, struct commit_list **list_p)
{
struct commit_list *new_list = xmalloc(sizeof(struct commit_list));