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authorNicolas Pitre <nico@cam.org>2005-05-06 13:48:34 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-06 11:02:01 -0700
commitbd2c39f58f915af532b488c5bda753314f0db603 (patch)
tree8c1e85a4af5d77cff94fc2703c271bbfc512778e /blob.c
parentf4f21ce367a5119be1c4396d01271ece6e40ff70 (diff)
downloadgit-bd2c39f58f915af532b488c5bda753314f0db603.tar.gz
git-bd2c39f58f915af532b488c5bda753314f0db603.tar.xz
[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 'blob.c')
-rw-r--r--blob.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/blob.c b/blob.c
index 625db4397..280f52415 100644
--- a/blob.c
+++ b/blob.c
@@ -22,21 +22,29 @@ struct blob *lookup_blob(unsigned char *sha1)
return (struct blob *) obj;
}
+int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size)
+{
+ item->object.parsed = 1;
+ return 0;
+}
+
int parse_blob(struct blob *item)
{
char type[20];
void *buffer;
unsigned long size;
+ int ret;
+
if (item->object.parsed)
return 0;
- item->object.parsed = 1;
buffer = read_sha1_file(item->object.sha1, type, &size);
if (!buffer)
return error("Could not read %s",
sha1_to_hex(item->object.sha1));
- free(buffer);
if (strcmp(type, blob_type))
return error("Object %s not a blob",
sha1_to_hex(item->object.sha1));
- return 0;
+ ret = parse_blob_buffer(item, buffer, size);
+ free(buffer);
+ return ret;
}