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Reuse cached data out of delta base cache.

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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>
This commit is contained in:
Nicolas Pitre 2007-03-17 21:13:57 -04:00 committed by Junio C Hamano
parent e5e01619bc
commit a0cba10847
1 changed files with 10 additions and 4 deletions
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14
sha1_file.c
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@ -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);
}
/*