mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

pack-objects: shrink z_delta_size field in struct object_entry

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

24
builtin/pack-objects.c
View File

@ -2099,12 +2099,19 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
* between writes at that moment.
*/
if (entry->delta_data && !pack_to_stdout) {
entry->z_delta_size = do_compress(&entry->delta_data,
entry->delta_size);
cache_lock();
delta_cache_size -= entry->delta_size;
delta_cache_size += entry->z_delta_size;
cache_unlock();
unsigned long size;
size = do_compress(&entry->delta_data, entry->delta_size);
if (size < (1U << OE_Z_DELTA_BITS)) {
entry->z_delta_size = size;
cache_lock();
delta_cache_size -= entry->delta_size;
delta_cache_size += entry->z_delta_size;
cache_unlock();
} else {
FREE_AND_NULL(entry->delta_data);
entry->z_delta_size = 0;
}
}
/* if we made n a delta, and if n is already at max
@ -3087,6 +3094,11 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
depth, (1 << OE_DEPTH_BITS) - 1);
depth = (1 << OE_DEPTH_BITS) - 1;
}
if (cache_max_small_delta_size >= (1U << OE_Z_DELTA_BITS)) {
warning(_("pack.deltaCacheLimit is too high, forcing %d"),
(1U << OE_Z_DELTA_BITS) - 1);
cache_max_small_delta_size = (1U << OE_Z_DELTA_BITS) - 1;
}
argv_array_push(&rp, "pack-objects");
if (thin) {