pack-objects: move 'layer' into 'struct packing_data'

This reduces the size of 'struct object_entry' from 88 bytes
to 80 and therefore makes packing objects more efficient.

For example on a Linux repo with 12M objects,
`git pack-objects --all` needs extra 96MB memory even if the
layer feature is not used.

Helped-by: Jeff King <peff@peff.net>
Helped-by: Duy Nguyen <pclouds@gmail.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index fd3e514b31b456c23c8c157ba038f327cfcffd1f..d5d91eeed5c894ade986e489b9d7f41e6c718a0b 100644 (file)
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -611,7 +611,7 @@ static inline void add_to_write_order(struct object_entry **wo,
                               unsigned int *endp,
                               struct object_entry *e)
 {
-       if (e->filled || e->layer != write_layer)
+       if (e->filled || oe_layer(&to_pack, e) != write_layer)
                return;
        wo[(*endp)++] = e;
        e->filled = 1;
@@ -714,7 +714,7 @@ static void compute_layer_order(struct object_entry **wo, unsigned int *wo_end)
         * Finally all the rest in really tight order
         */
        for (i = last_untagged; i < to_pack.nr_objects; i++) {
-               if (!objects[i].filled && objects[i].layer == write_layer)
+               if (!objects[i].filled && oe_layer(&to_pack, &objects[i]) == write_layer)
                        add_family_to_write_order(wo, wo_end, &objects[i]);
        }
 }

diff --git a/delta-islands.c b/delta-islands.c
index b0b9157c857a34001cead6b33d36292e9473bba1..8e5018e40614f3af617440fb0a2ee2f4b9e1d32c 100644 (file)
--- a/delta-islands.c
+++ b/delta-islands.c
@@ -488,13 +488,13 @@ int compute_pack_layers(struct packing_data *to_pack)
                struct object_entry *entry = &to_pack->objects[i];
                khiter_t pos = kh_get_sha1(island_marks, entry->idx.oid.hash);
 
-               entry->layer = 1;
+               oe_set_layer(to_pack, entry, 1);
 
                if (pos < kh_end(island_marks)) {
                        struct island_bitmap *bitmap = kh_value(island_marks, pos);
 
                        if (island_bitmap_get(bitmap, island_counter_core))
-                               entry->layer = 0;
+                               oe_set_layer(to_pack, entry, 0);
                }
        }
 

diff --git a/pack-objects.c b/pack-objects.c
index 30314572e6f59693fbb9c6d8a6a5c7dbabc70ed7..98389460c2dc49c198313d1b961adffcece9120d 100644 (file)
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -163,6 +163,9 @@ struct object_entry *packlist_alloc(struct packing_data *pdata,
 
                if (pdata->tree_depth)
                        REALLOC_ARRAY(pdata->tree_depth, pdata->nr_alloc);
+
+               if (pdata->layer)
+                       REALLOC_ARRAY(pdata->layer, pdata->nr_alloc);
        }
 
        new_entry = pdata->objects + pdata->nr_objects++;
@@ -181,5 +184,8 @@ struct object_entry *packlist_alloc(struct packing_data *pdata,
        if (pdata->tree_depth)
                pdata->tree_depth[pdata->nr_objects - 1] = 0;
 
+       if (pdata->layer)
+               pdata->layer[pdata->nr_objects - 1] = 0;
+
        return new_entry;
 }

diff --git a/pack-objects.h b/pack-objects.h
index 3cb5527eeb2b146719284928fd29ea8c9b60360b..ad3c2087641e8f017c5bfd202ac29cd7f1c57518 100644 (file)
--- a/pack-objects.h
+++ b/pack-objects.h
@@ -101,8 +101,6 @@ struct object_entry {
        unsigned no_try_delta:1;
        unsigned in_pack_type:TYPE_BITS; /* could be delta */
 
-       unsigned char layer;
-
        unsigned preferred_base:1; /*
                                    * we do not pack this, but is available
                                    * to be used as the base object to delta
@@ -147,6 +145,7 @@ struct packing_data {
 
        /* delta islands */
        unsigned int *tree_depth;
+       unsigned char *layer;
 };
 
 void prepare_packing_data(struct packing_data *pdata);
@@ -369,4 +368,21 @@ static inline void oe_set_tree_depth(struct packing_data *pack,
        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)
+               ALLOC_ARRAY(pack->layer, pack->nr_objects);
+       pack->layer[e - pack->objects] = layer;
+}
+
 #endif