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| author | Nicolas Pitre <nico@cam.org> | 2007-03-18 01:13:57 (GMT) |
|---|---|---|
| committer | Junio C Hamano <junkio@cox.net> | 2007-03-18 22:36:59 (GMT) |
| commit | a0cba10847c85b0becc3c7045a423e3dc8a8f4ae (patch) | |
| tree | 701e3f5a75cb3c77c65485ef72133d913a265327 /sha1_file.c | |
| parent | e5e01619bcb753a3c45fb51d498371c9ff0677da (diff) | |
| download | git-a0cba10847c85b0becc3c7045a423e3dc8a8f4ae.zip git-a0cba10847c85b0becc3c7045a423e3dc8a8f4ae.tar.gz git-a0cba10847c85b0becc3c7045a423e3dc8a8f4ae.tar.bz2 | |
Reuse cached data out of delta base cache.
A malloc() + memcpy() will always be faster than mmap() +
malloc() + inflate(). If the data is already there it is
certainly better to copy it straight away.
With this patch below I can do 'git log drivers/scsi/ >
/dev/null' about 7% faster. I bet it might be even more on
those platforms with bad mmap() support.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'sha1_file.c')
| -rw-r--r-- | sha1_file.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sha1_file.c b/sha1_file.c index a7e3a2a..ee64865 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -1372,7 +1372,7 @@ static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) } static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, - unsigned long *base_size, enum object_type *type) + unsigned long *base_size, enum object_type *type, int keep_cache) { void *ret; unsigned long hash = pack_entry_hash(p, base_offset); @@ -1384,7 +1384,13 @@ static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, return unpack_entry(p, base_offset, type, base_size); found_cache_entry: - ent->data = NULL; + if (!keep_cache) + ent->data = NULL; + else { + ret = xmalloc(ent->size + 1); + memcpy(ret, ent->data, ent->size); + ((char *)ret)[ent->size] = 0; + } *type = ent->type; *base_size = ent->size; return ret; @@ -1418,7 +1424,7 @@ static void *unpack_delta_entry(struct packed_git *p, off_t base_offset; base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); - base = cache_or_unpack_entry(p, base_offset, &base_size, type); + base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); if (!base) die("failed to read delta base object" " at %"PRIuMAX" from %s", @@ -1615,7 +1621,7 @@ static void *read_packed_sha1(const unsigned char *sha1, if (!find_pack_entry(sha1, &e, NULL)) return NULL; else - return unpack_entry(e.p, e.offset, type, size); + return cache_or_unpack_entry(e.p, e.offset, size, type, 1); } /* |