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pack-objects: shrink z_delta_size field in struct object_entry

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We only cache deltas when it's smaller than a certain limit. This limit
defaults to 1000 but save its compressed length in a 64-bit field.
Shrink that field down to 20 bits, so you can only cache 1MB deltas.
Larger deltas must be recomputed at when the pack is written down.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2018-04-14 17:35:07 +02:00
committed by Junio C Hamano
parent 898eba5e63
commit 0cb3c1427a
3 changed files with 22 additions and 8 deletions
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3
pack-objects.h
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@@ -6,6 +6,7 @@
#define OE_DFS_STATE_BITS 2
#define OE_DEPTH_BITS 12
#define OE_IN_PACK_BITS 10
#define OE_Z_DELTA_BITS 20
/*
* State flags for depth-first search used for analyzing delta cycles.
@@ -77,7 +78,7 @@ struct object_entry {
*/
void *delta_data; /* cached delta (uncompressed) */
unsigned long delta_size; /* delta data size (uncompressed) */
unsigned long z_delta_size; /* delta data size (compressed) */
unsigned z_delta_size:OE_Z_DELTA_BITS;
unsigned type_:TYPE_BITS;
unsigned in_pack_type:TYPE_BITS; /* could be delta */
unsigned type_valid:1;