#include "progress.h"
static const char pack_usage[] = "\
-git-pack-objects [{ -q | --progress | --all-progress }] [--max-pack-size=N] \n\
- [--local] [--incremental] [--window=N] [--depth=N] \n\
+git-pack-objects [{ -q | --progress | --all-progress }] \n\
+ [--max-pack-size=N] [--local] [--incremental] \n\
+ [--window=N] [--window-memory=N] [--depth=N] \n\
[--no-reuse-delta] [--no-reuse-object] [--delta-base-offset] \n\
[--non-empty] [--revs [--unpacked | --all]*] [--reflog] \n\
[--stdout | base-name] [<ref-list | <object-list]";
struct object_entry {
struct pack_idx_entry idx;
unsigned long size; /* uncompressed size */
-
- unsigned int hash; /* name hint hash */
- unsigned int depth; /* delta depth */
struct packed_git *in_pack; /* already in pack */
off_t in_pack_offset;
struct object_entry *delta; /* delta base object */
*/
void *delta_data; /* cached delta (uncompressed) */
unsigned long delta_size; /* delta data size (uncompressed) */
+ unsigned int hash; /* name hint hash */
enum object_type type;
enum object_type in_pack_type; /* could be delta */
unsigned char in_pack_header_size;
static unsigned long max_delta_cache_size = 0;
static unsigned long cache_max_small_delta_size = 1000;
+static unsigned long window_memory_usage = 0;
+static unsigned long window_memory_limit = 0;
+
/*
* The object names in objects array are hashed with this hashtable,
* to help looking up the entry by object name.
struct object_entry *entry;
void *data;
struct delta_index *index;
+ unsigned depth;
};
static int delta_cacheable(struct unpacked *trg, struct unpacked *src,
struct object_entry *trg_entry = trg->entry;
struct object_entry *src_entry = src->entry;
unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
+ unsigned ref_depth;
enum object_type type;
void *delta_buf;
return 0;
/* Let's not bust the allowed depth. */
- if (src_entry->depth >= max_depth)
+ if (src->depth >= max_depth)
return 0;
/* Now some size filtering heuristics. */
trg_size = trg_entry->size;
- max_size = trg_size/2 - 20;
- max_size = max_size * (max_depth - src_entry->depth) / max_depth;
+ if (!trg_entry->delta) {
+ max_size = trg_size/2 - 20;
+ ref_depth = 1;
+ } else {
+ max_size = trg_entry->delta_size;
+ ref_depth = trg->depth;
+ }
+ max_size = max_size * (max_depth - src->depth) /
+ (max_depth - ref_depth + 1);
if (max_size == 0)
return 0;
- if (trg_entry->delta && trg_entry->delta_size <= max_size)
- max_size = trg_entry->delta_size-1;
src_size = src_entry->size;
sizediff = src_size < trg_size ? trg_size - src_size : 0;
if (sizediff >= max_size)
return 0;
+ if (trg_size < src_size / 32)
+ return 0;
/* Load data if not already done */
if (!trg->data) {
if (sz != trg_size)
die("object %s inconsistent object length (%lu vs %lu)",
sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
+ window_memory_usage += sz;
}
if (!src->data) {
src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
if (sz != src_size)
die("object %s inconsistent object length (%lu vs %lu)",
sha1_to_hex(src_entry->idx.sha1), sz, src_size);
+ window_memory_usage += sz;
}
if (!src->index) {
src->index = create_delta_index(src->data, src_size);
warning("suboptimal pack - out of memory");
return 0;
}
+ window_memory_usage += sizeof_delta_index(src->index);
}
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
return 0;
if (trg_entry->delta_data) {
+ /* Prefer only shallower same-sized deltas. */
+ if (delta_size == trg_entry->delta_size &&
+ src->depth + 1 >= trg->depth) {
+ free(delta_buf);
+ return 0;
+ }
delta_cache_size -= trg_entry->delta_size;
free(trg_entry->delta_data);
+ trg_entry->delta_data = NULL;
}
- trg_entry->delta_data = 0;
trg_entry->delta = src_entry;
trg_entry->delta_size = delta_size;
- trg_entry->depth = src_entry->depth + 1;
+ trg->depth = src->depth + 1;
if (delta_cacheable(src, trg, src_size, trg_size, delta_size)) {
trg_entry->delta_data = xrealloc(delta_buf, delta_size);
return m;
}
+static void free_unpacked(struct unpacked *n)
+{
+ window_memory_usage -= sizeof_delta_index(n->index);
+ free_delta_index(n->index);
+ n->index = NULL;
+ if (n->data) {
+ free(n->data);
+ n->data = NULL;
+ window_memory_usage -= n->entry->size;
+ }
+ n->entry = NULL;
+ n->depth = 0;
+}
+
static void find_deltas(struct object_entry **list, int window, int depth)
{
- uint32_t i = nr_objects, idx = 0, processed = 0;
+ uint32_t i = nr_objects, idx = 0, count = 0, processed = 0;
unsigned int array_size = window * sizeof(struct unpacked);
struct unpacked *array;
int max_depth;
if (entry->no_try_delta)
continue;
- free_delta_index(n->index);
- n->index = NULL;
- free(n->data);
- n->data = NULL;
+ free_unpacked(n);
n->entry = entry;
+ while (window_memory_limit &&
+ window_memory_usage > window_memory_limit &&
+ count > 1) {
+ uint32_t tail = (idx + window - count) % window;
+ free_unpacked(array + tail);
+ count--;
+ }
+
/*
* If the current object is at pack edge, take the depth the
* objects that depend on the current object into account
* depth, leaving it in the window is pointless. we
* should evict it first.
*/
- if (entry->delta && depth <= entry->depth)
+ if (entry->delta && depth <= n->depth)
continue;
next:
idx++;
+ if (count + 1 < window)
+ count++;
if (idx >= window)
idx = 0;
} while (i > 0);
window = git_config_int(k, v);
return 0;
}
- if(!strcmp(k, "pack.depth")) {
+ if (!strcmp(k, "pack.windowmemory")) {
+ window_memory_limit = git_config_ulong(k, v);
+ return 0;
+ }
+ if (!strcmp(k, "pack.depth")) {
depth = git_config_int(k, v);
return 0;
}
usage(pack_usage);
continue;
}
+ if (!prefixcmp(arg, "--window-memory=")) {
+ if (!git_parse_ulong(arg+16, &window_memory_limit))
+ usage(pack_usage);
+ continue;
+ }
if (!prefixcmp(arg, "--depth=")) {
char *end;
depth = strtoul(arg+8, &end, 0);