#define PACK_OBJECTS_H
#include "object-store.h"
+#include "thread-utils.h"
+#include "pack.h"
+
+struct repository;
+
+#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
#define OE_DFS_STATE_BITS 2
#define OE_DEPTH_BITS 12
* above this limit. Don't lower it too much.
*/
#define OE_SIZE_BITS 31
-#define OE_DELTA_SIZE_BITS 20
+#define OE_DELTA_SIZE_BITS 23
/*
* State flags for depth-first search used for analyzing delta cycles.
};
/*
+ * The size of struct nearly determines pack-objects's memory
+ * consumption. This struct is packed tight for that reason. When you
+ * add or reorder something in this struct, think a bit about this.
+ *
* basic object info
* -----------------
* idx.oid is filled up before delta searching starts. idx.crc32 is
*/
struct object_entry {
struct pack_idx_entry idx;
+ void *delta_data; /* cached delta (uncompressed) */
+ off_t in_pack_offset;
+ uint32_t hash; /* name hint hash */
unsigned size_:OE_SIZE_BITS;
unsigned size_valid:1;
- unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
- off_t in_pack_offset;
uint32_t delta_idx; /* delta base object */
uint32_t delta_child_idx; /* deltified objects who bases me */
uint32_t delta_sibling_idx; /* other deltified objects who
* uses the same base as me
*/
- void *delta_data; /* cached delta (uncompressed) */
unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
unsigned delta_size_valid:1;
+ unsigned char in_pack_header_size;
+ unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
unsigned z_delta_size:OE_Z_DELTA_BITS;
+ unsigned type_valid:1;
+ unsigned no_try_delta:1;
unsigned type_:TYPE_BITS;
unsigned in_pack_type:TYPE_BITS; /* could be delta */
- unsigned type_valid:1;
- uint32_t hash; /* name hint hash */
- unsigned char in_pack_header_size;
+
unsigned preferred_base:1; /*
* we do not pack this, but is available
* to be used as the base object to delta
* objects against.
*/
- unsigned no_try_delta:1;
unsigned tagged:1; /* near the very tip of refs */
unsigned filled:1; /* assigned write-order */
unsigned dfs_state:OE_DFS_STATE_BITS;
unsigned depth:OE_DEPTH_BITS;
+ unsigned ext_base:1; /* delta_idx points outside packlist */
+
+ /*
+ * pahole results on 64-bit linux (gcc and clang)
+ *
+ * size: 80, bit_padding: 9 bits
+ *
+ * and on 32-bit (gcc)
+ *
+ * size: 76, bit_padding: 9 bits
+ */
};
struct packing_data {
+ struct repository *repo;
struct object_entry *objects;
uint32_t nr_objects, nr_alloc;
uint32_t index_size;
unsigned int *in_pack_pos;
+ unsigned long *delta_size;
/*
* Only one of these can be non-NULL and they have different
struct packed_git **in_pack_by_idx;
struct packed_git **in_pack;
+ pthread_mutex_t lock;
+
+ /*
+ * This list contains entries for bases which we know the other side
+ * has (e.g., via reachability bitmaps), but which aren't in our
+ * "objects" list.
+ */
+ struct object_entry *ext_bases;
+ uint32_t nr_ext, alloc_ext;
+
uintmax_t oe_size_limit;
+ uintmax_t oe_delta_size_limit;
+
+ /* delta islands */
+ unsigned int *tree_depth;
+ unsigned char *layer;
};
-void prepare_packing_data(struct packing_data *pdata);
+void prepare_packing_data(struct repository *r, struct packing_data *pdata);
+
+static inline void packing_data_lock(struct packing_data *pdata)
+{
+ pthread_mutex_lock(&pdata->lock);
+}
+static inline void packing_data_unlock(struct packing_data *pdata)
+{
+ pthread_mutex_unlock(&pdata->lock);
+}
+
struct object_entry *packlist_alloc(struct packing_data *pdata,
const unsigned char *sha1,
uint32_t index_pos);
const struct packing_data *pack,
const struct object_entry *e)
{
- if (e->delta_idx)
+ if (!e->delta_idx)
+ return NULL;
+ if (e->ext_base)
+ return &pack->ext_bases[e->delta_idx - 1];
+ else
return &pack->objects[e->delta_idx - 1];
- return NULL;
}
static inline void oe_set_delta(struct packing_data *pack,
e->delta_idx = 0;
}
+void oe_set_delta_ext(struct packing_data *pack,
+ struct object_entry *e,
+ const unsigned char *sha1);
+
static inline struct object_entry *oe_delta_child(
const struct packing_data *pack,
const struct object_entry *e)
{
if (e->delta_size_valid)
return e->delta_size_;
- return oe_size(pack, e);
+
+ /*
+ * pack->delta_size[] can't be NULL because oe_set_delta_size()
+ * must have been called when a new delta is saved with
+ * oe_set_delta().
+ * If oe_delta() returns NULL (i.e. default state, which means
+ * delta_size_valid is also false), then the caller must never
+ * call oe_delta_size().
+ */
+ return pack->delta_size[e - pack->objects];
}
static inline void oe_set_delta_size(struct packing_data *pack,
struct object_entry *e,
unsigned long size)
{
- e->delta_size_ = size;
- e->delta_size_valid = e->delta_size_ == size;
- if (!e->delta_size_valid && size != oe_size(pack, e))
- BUG("this can only happen in check_object() "
- "where delta size is the same as entry size");
+ if (size < pack->oe_delta_size_limit) {
+ e->delta_size_ = size;
+ e->delta_size_valid = 1;
+ } else {
+ packing_data_lock(pack);
+ if (!pack->delta_size)
+ ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
+ packing_data_unlock(pack);
+
+ pack->delta_size[e - pack->objects] = size;
+ e->delta_size_valid = 0;
+ }
+}
+
+static inline unsigned int oe_tree_depth(struct packing_data *pack,
+ struct object_entry *e)
+{
+ if (!pack->tree_depth)
+ return 0;
+ return pack->tree_depth[e - pack->objects];
+}
+
+static inline void oe_set_tree_depth(struct packing_data *pack,
+ struct object_entry *e,
+ unsigned int tree_depth)
+{
+ if (!pack->tree_depth)
+ CALLOC_ARRAY(pack->tree_depth, pack->nr_alloc);
+ pack->tree_depth[e - pack->objects] = tree_depth;
+}
+
+static inline unsigned char oe_layer(struct packing_data *pack,
+ struct object_entry *e)
+{
+ if (!pack->layer)
+ return 0;
+ return pack->layer[e - pack->objects];
+}
+
+static inline void oe_set_layer(struct packing_data *pack,
+ struct object_entry *e,
+ unsigned char layer)
+{
+ if (!pack->layer)
+ CALLOC_ARRAY(pack->layer, pack->nr_alloc);
+ pack->layer[e - pack->objects] = layer;
}
#endif