Code

Shrink "struct object" a bit
authorLinus Torvalds <torvalds@osdl.org>
Wed, 14 Jun 2006 23:45:13 +0000 (16:45 -0700)
committerJunio C Hamano <junkio@cox.net>
Sun, 18 Jun 2006 01:49:18 +0000 (18:49 -0700)
commit885a86abe2e9f7b96a4e2012183c6751635840aa
treeb3fc0545d874cf62bee7e02ae1673722e434f8ad
parent210a0be504829bad5a2821488d3c25cc406fed4a
Shrink "struct object" a bit

This shrinks "struct object" by a small amount, by getting rid of the
"struct type *" pointer and replacing it with a 3-bit bitfield instead.

In addition, we merge the bitfields and the "flags" field, which
incidentally should also remove a useless 4-byte padding from the object
when in 64-bit mode.

Now, our "struct object" is still too damn large, but it's now less
obviously bloated, and of the remaining fields, only the "util" (which is
not used by most things) is clearly something that should be eventually
discarded.

This shrinks the "git-rev-list --all" memory use by about 2.5% on the
kernel archive (and, perhaps more importantly, on the larger mozilla
archive). That may not sound like much, but I suspect it's more on a
64-bit platform.

There are other remaining inefficiencies (the parent lists, for example,
probably have horrible malloc overhead), but this was pretty obvious.

Most of the patch is just changing the comparison of the "type" pointer
from one of the constant string pointers to the appropriate new TYPE_xxx
small integer constant.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
21 files changed:
blob.c
builtin-diff.c
builtin-grep.c
builtin-rev-list.c
builtin-show-branch.c
commit.c
describe.c
fetch-pack.c
fetch.c
fsck-objects.c
http-push.c
name-rev.c
object.c
object.h
revision.c
send-pack.c
server-info.c
sha1_name.c
tag.c
tree.c
upload-pack.c