mirror of
https://github.com/git/git.git
synced 2024-05-07 09:16:13 +02:00
pack-objects: refactor the packing list
The hash table that stores the packing list for a given `pack-objects` run was tightly coupled to the pack-objects code. In this commit, we refactor the hash table and the underlying storage array into a `packing_data` struct. The functionality for accessing and adding entries to the packing list is hence accessible from other parts of Git besides the `pack-objects` builtin. This refactoring is a requirement for further patches in this series that will require accessing the commit packing list from outside of `pack-objects`. The hash table implementation has been minimally altered: we now use table sizes which are always a power of two, to ensure a uniform index distribution in the array. Signed-off-by: Vicent Marti <tanoku@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Vicent Marti
Junio C Hamano
parent
92e5c77c37
commit
2834bc27c1
2
Makefile
2
Makefile
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@ -694,6 +694,7 @@ LIB_H += notes-merge.h
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LIB_H += notes-utils.h
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LIB_H += notes.h
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LIB_H += object.h
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LIB_H += pack-objects.h
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LIB_H += pack-revindex.h
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LIB_H += pack.h
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LIB_H += parse-options.h
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@ -831,6 +832,7 @@ LIB_OBJS += notes-merge.o
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LIB_OBJS += notes-utils.o
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LIB_OBJS += object.o
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LIB_OBJS += pack-check.o
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LIB_OBJS += pack-objects.o
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LIB_OBJS += pack-revindex.o
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LIB_OBJS += pack-write.o
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LIB_OBJS += pager.o
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@ -14,6 +14,7 @@
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#include "diff.h"
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#include "revision.h"
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#include "list-objects.h"
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#include "pack-objects.h"
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#include "progress.h"
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#include "refs.h"
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#include "streaming.h"
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@ -25,42 +26,15 @@ static const char *pack_usage[] = {
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NULL
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};
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struct object_entry {
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struct pack_idx_entry idx;
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unsigned long size; /* uncompressed size */
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struct packed_git *in_pack; /* already in pack */
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off_t in_pack_offset;
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struct object_entry *delta; /* delta base object */
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struct object_entry *delta_child; /* deltified objects who bases me */
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struct object_entry *delta_sibling; /* other deltified objects who
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* uses the same base as me
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*/
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void *delta_data; /* cached delta (uncompressed) */
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unsigned long delta_size; /* delta data size (uncompressed) */
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unsigned long z_delta_size; /* delta data size (compressed) */
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enum object_type type;
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enum object_type in_pack_type; /* could be delta */
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uint32_t hash; /* name hint hash */
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unsigned char in_pack_header_size;
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unsigned preferred_base:1; /*
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* we do not pack this, but is available
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* to be used as the base object to delta
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* objects against.
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*/
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unsigned no_try_delta:1;
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unsigned tagged:1; /* near the very tip of refs */
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unsigned filled:1; /* assigned write-order */
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};
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/*
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* Objects we are going to pack are collected in objects array (dynamically
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* expanded). nr_objects & nr_alloc controls this array. They are stored
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* in the order we see -- typically rev-list --objects order that gives us
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* nice "minimum seek" order.
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* Objects we are going to pack are collected in the `to_pack` structure.
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* It contains an array (dynamically expanded) of the object data, and a map
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* that can resolve SHA1s to their position in the array.
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*/
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static struct object_entry *objects;
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static struct packing_data to_pack;
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static struct pack_idx_entry **written_list;
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static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
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static uint32_t nr_result, nr_written;
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static int non_empty;
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static int reuse_delta = 1, reuse_object = 1;
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@ -89,22 +63,12 @@ static unsigned long cache_max_small_delta_size = 1000;
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static unsigned long window_memory_limit = 0;
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/*
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* The object names in objects array are hashed with this hashtable,
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* to help looking up the entry by object name.
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* This hashtable is built after all the objects are seen.
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*/
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static int *object_ix;
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static int object_ix_hashsz;
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static struct object_entry *locate_object_entry(const unsigned char *sha1);
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/*
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* stats
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*/
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static uint32_t written, written_delta;
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static uint32_t reused, reused_delta;
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static void *get_delta(struct object_entry *entry)
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{
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unsigned long size, base_size, delta_size;
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@ -553,12 +517,12 @@ static int mark_tagged(const char *path, const unsigned char *sha1, int flag,
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void *cb_data)
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{
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unsigned char peeled[20];
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struct object_entry *entry = locate_object_entry(sha1);
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struct object_entry *entry = packlist_find(&to_pack, sha1, NULL);
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if (entry)
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entry->tagged = 1;
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if (!peel_ref(path, peeled)) {
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entry = locate_object_entry(peeled);
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entry = packlist_find(&to_pack, peeled, NULL);
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if (entry)
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entry->tagged = 1;
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}
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@ -633,9 +597,10 @@ static struct object_entry **compute_write_order(void)
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{
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unsigned int i, wo_end, last_untagged;
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struct object_entry **wo = xmalloc(nr_objects * sizeof(*wo));
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struct object_entry **wo = xmalloc(to_pack.nr_objects * sizeof(*wo));
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struct object_entry *objects = to_pack.objects;
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for (i = 0; i < nr_objects; i++) {
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for (i = 0; i < to_pack.nr_objects; i++) {
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objects[i].tagged = 0;
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objects[i].filled = 0;
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objects[i].delta_child = NULL;
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@ -647,7 +612,7 @@ static struct object_entry **compute_write_order(void)
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* Make sure delta_sibling is sorted in the original
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* recency order.
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*/
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for (i = nr_objects; i > 0;) {
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for (i = to_pack.nr_objects; i > 0;) {
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struct object_entry *e = &objects[--i];
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if (!e->delta)
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continue;
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@ -665,7 +630,7 @@ static struct object_entry **compute_write_order(void)
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* Give the objects in the original recency order until
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* we see a tagged tip.
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*/
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for (i = wo_end = 0; i < nr_objects; i++) {
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for (i = wo_end = 0; i < to_pack.nr_objects; i++) {
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if (objects[i].tagged)
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break;
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add_to_write_order(wo, &wo_end, &objects[i]);
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@ -675,7 +640,7 @@ static struct object_entry **compute_write_order(void)
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/*
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* Then fill all the tagged tips.
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*/
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for (; i < nr_objects; i++) {
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for (; i < to_pack.nr_objects; i++) {
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if (objects[i].tagged)
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add_to_write_order(wo, &wo_end, &objects[i]);
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}
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@ -683,7 +648,7 @@ static struct object_entry **compute_write_order(void)
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/*
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* And then all remaining commits and tags.
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*/
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for (i = last_untagged; i < nr_objects; i++) {
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for (i = last_untagged; i < to_pack.nr_objects; i++) {
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if (objects[i].type != OBJ_COMMIT &&
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objects[i].type != OBJ_TAG)
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continue;
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@ -693,7 +658,7 @@ static struct object_entry **compute_write_order(void)
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/*
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* And then all the trees.
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*/
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for (i = last_untagged; i < nr_objects; i++) {
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for (i = last_untagged; i < to_pack.nr_objects; i++) {
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if (objects[i].type != OBJ_TREE)
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continue;
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add_to_write_order(wo, &wo_end, &objects[i]);
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@ -702,13 +667,13 @@ static struct object_entry **compute_write_order(void)
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/*
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* Finally all the rest in really tight order
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*/
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for (i = last_untagged; i < nr_objects; i++) {
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for (i = last_untagged; i < to_pack.nr_objects; i++) {
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if (!objects[i].filled)
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add_family_to_write_order(wo, &wo_end, &objects[i]);
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}
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if (wo_end != nr_objects)
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die("ordered %u objects, expected %"PRIu32, wo_end, nr_objects);
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if (wo_end != to_pack.nr_objects)
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die("ordered %u objects, expected %"PRIu32, wo_end, to_pack.nr_objects);
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return wo;
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}
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@ -724,7 +689,7 @@ static void write_pack_file(void)
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if (progress > pack_to_stdout)
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progress_state = start_progress("Writing objects", nr_result);
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written_list = xmalloc(nr_objects * sizeof(*written_list));
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written_list = xmalloc(to_pack.nr_objects * sizeof(*written_list));
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write_order = compute_write_order();
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do {
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@ -740,7 +705,7 @@ static void write_pack_file(void)
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if (!offset)
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die_errno("unable to write pack header");
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nr_written = 0;
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for (; i < nr_objects; i++) {
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for (; i < to_pack.nr_objects; i++) {
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struct object_entry *e = write_order[i];
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if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
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break;
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@ -803,7 +768,7 @@ static void write_pack_file(void)
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written_list[j]->offset = (off_t)-1;
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}
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nr_remaining -= nr_written;
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} while (nr_remaining && i < nr_objects);
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} while (nr_remaining && i < to_pack.nr_objects);
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free(written_list);
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free(write_order);
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@ -813,53 +778,6 @@ static void write_pack_file(void)
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written, nr_result);
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}
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static int locate_object_entry_hash(const unsigned char *sha1)
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{
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int i;
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unsigned int ui;
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memcpy(&ui, sha1, sizeof(unsigned int));
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i = ui % object_ix_hashsz;
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while (0 < object_ix[i]) {
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if (!hashcmp(sha1, objects[object_ix[i] - 1].idx.sha1))
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return i;
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if (++i == object_ix_hashsz)
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i = 0;
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}
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return -1 - i;
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}
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static struct object_entry *locate_object_entry(const unsigned char *sha1)
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{
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int i;
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if (!object_ix_hashsz)
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return NULL;
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i = locate_object_entry_hash(sha1);
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if (0 <= i)
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return &objects[object_ix[i]-1];
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return NULL;
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}
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static void rehash_objects(void)
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{
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uint32_t i;
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struct object_entry *oe;
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object_ix_hashsz = nr_objects * 3;
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if (object_ix_hashsz < 1024)
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object_ix_hashsz = 1024;
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object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
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memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
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for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
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int ix = locate_object_entry_hash(oe->idx.sha1);
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if (0 <= ix)
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continue;
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ix = -1 - ix;
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object_ix[ix] = i + 1;
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}
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}
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static uint32_t name_hash(const char *name)
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{
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uint32_t c, hash = 0;
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@ -908,13 +826,12 @@ static int add_object_entry(const unsigned char *sha1, enum object_type type,
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struct object_entry *entry;
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struct packed_git *p, *found_pack = NULL;
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off_t found_offset = 0;
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int ix;
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uint32_t hash = name_hash(name);
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uint32_t index_pos;
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ix = nr_objects ? locate_object_entry_hash(sha1) : -1;
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if (ix >= 0) {
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entry = packlist_find(&to_pack, sha1, &index_pos);
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if (entry) {
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if (exclude) {
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entry = objects + object_ix[ix] - 1;
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if (!entry->preferred_base)
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nr_result--;
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entry->preferred_base = 1;
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@ -947,14 +864,7 @@ static int add_object_entry(const unsigned char *sha1, enum object_type type,
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}
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}
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if (nr_objects >= nr_alloc) {
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nr_alloc = (nr_alloc + 1024) * 3 / 2;
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objects = xrealloc(objects, nr_alloc * sizeof(*entry));
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}
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entry = objects + nr_objects++;
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memset(entry, 0, sizeof(*entry));
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hashcpy(entry->idx.sha1, sha1);
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entry = packlist_alloc(&to_pack, sha1, index_pos);
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entry->hash = hash;
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if (type)
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entry->type = type;
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@ -967,12 +877,7 @@ static int add_object_entry(const unsigned char *sha1, enum object_type type,
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entry->in_pack_offset = found_offset;
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}
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if (object_ix_hashsz * 3 <= nr_objects * 4)
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rehash_objects();
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else
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object_ix[-1 - ix] = nr_objects;
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display_progress(progress_state, nr_objects);
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display_progress(progress_state, to_pack.nr_objects);
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if (name && no_try_delta(name))
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entry->no_try_delta = 1;
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@ -1329,7 +1234,7 @@ static void check_object(struct object_entry *entry)
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break;
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}
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if (base_ref && (base_entry = locate_object_entry(base_ref))) {
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if (base_ref && (base_entry = packlist_find(&to_pack, base_ref, NULL))) {
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/*
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* If base_ref was set above that means we wish to
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* reuse delta data, and we even found that base
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@ -1403,12 +1308,12 @@ static void get_object_details(void)
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uint32_t i;
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struct object_entry **sorted_by_offset;
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sorted_by_offset = xcalloc(nr_objects, sizeof(struct object_entry *));
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for (i = 0; i < nr_objects; i++)
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sorted_by_offset[i] = objects + i;
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qsort(sorted_by_offset, nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
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sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
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for (i = 0; i < to_pack.nr_objects; i++)
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sorted_by_offset[i] = to_pack.objects + i;
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qsort(sorted_by_offset, to_pack.nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
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for (i = 0; i < nr_objects; i++) {
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for (i = 0; i < to_pack.nr_objects; i++) {
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struct object_entry *entry = sorted_by_offset[i];
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check_object(entry);
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if (big_file_threshold < entry->size)
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@ -2034,7 +1939,7 @@ static int add_ref_tag(const char *path, const unsigned char *sha1, int flag, vo
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if (!prefixcmp(path, "refs/tags/") && /* is a tag? */
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!peel_ref(path, peeled) && /* peelable? */
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locate_object_entry(peeled)) /* object packed? */
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packlist_find(&to_pack, peeled, NULL)) /* object packed? */
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add_object_entry(sha1, OBJ_TAG, NULL, 0);
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return 0;
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}
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@ -2057,14 +1962,14 @@ static void prepare_pack(int window, int depth)
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if (!pack_to_stdout)
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do_check_packed_object_crc = 1;
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if (!nr_objects || !window || !depth)
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if (!to_pack.nr_objects || !window || !depth)
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return;
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delta_list = xmalloc(nr_objects * sizeof(*delta_list));
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delta_list = xmalloc(to_pack.nr_objects * sizeof(*delta_list));
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nr_deltas = n = 0;
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for (i = 0; i < nr_objects; i++) {
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struct object_entry *entry = objects + i;
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for (i = 0; i < to_pack.nr_objects; i++) {
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struct object_entry *entry = to_pack.objects + i;
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if (entry->delta)
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/* This happens if we decided to reuse existing
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@ -2342,7 +2247,7 @@ static void loosen_unused_packed_objects(struct rev_info *revs)
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for (i = 0; i < p->num_objects; i++) {
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sha1 = nth_packed_object_sha1(p, i);
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if (!locate_object_entry(sha1) &&
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if (!packlist_find(&to_pack, sha1, NULL) &&
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!has_sha1_pack_kept_or_nonlocal(sha1))
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if (force_object_loose(sha1, p->mtime))
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die("unable to force loose object");
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@ -0,0 +1,111 @@
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#include "cache.h"
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#include "object.h"
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#include "pack.h"
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#include "pack-objects.h"
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static uint32_t locate_object_entry_hash(struct packing_data *pdata,
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const unsigned char *sha1,
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int *found)
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{
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uint32_t i, hash, mask = (pdata->index_size - 1);
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memcpy(&hash, sha1, sizeof(uint32_t));
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i = hash & mask;
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while (pdata->index[i] > 0) {
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uint32_t pos = pdata->index[i] - 1;
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if (!hashcmp(sha1, pdata->objects[pos].idx.sha1)) {
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*found = 1;
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return i;
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}
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i = (i + 1) & mask;
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}
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*found = 0;
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return i;
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}
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static inline uint32_t closest_pow2(uint32_t v)
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{
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v = v - 1;
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v |= v >> 1;
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||||
v |= v >> 2;
|
||||
v |= v >> 4;
|
||||
v |= v >> 8;
|
||||
v |= v >> 16;
|
||||
return v + 1;
|
||||
}
|
||||
|
||||
static void rehash_objects(struct packing_data *pdata)
|
||||
{
|
||||
uint32_t i;
|
||||
struct object_entry *entry;
|
||||
|
||||
pdata->index_size = closest_pow2(pdata->nr_objects * 3);
|
||||
if (pdata->index_size < 1024)
|
||||
pdata->index_size = 1024;
|
||||
|
||||
pdata->index = xrealloc(pdata->index, sizeof(uint32_t) * pdata->index_size);
|
||||
memset(pdata->index, 0, sizeof(int) * pdata->index_size);
|
||||
|
||||
entry = pdata->objects;
|
||||
|
||||
for (i = 0; i < pdata->nr_objects; i++) {
|
||||
int found;
|
||||
uint32_t ix = locate_object_entry_hash(pdata, entry->idx.sha1, &found);
|
||||
|
||||
if (found)
|
||||
die("BUG: Duplicate object in hash");
|
||||
|
||||
pdata->index[ix] = i + 1;
|
||||
entry++;
|
||||
}
|
||||
}
|
||||
|
||||
struct object_entry *packlist_find(struct packing_data *pdata,
|
||||
const unsigned char *sha1,
|
||||
uint32_t *index_pos)
|
||||
{
|
||||
uint32_t i;
|
||||
int found;
|
||||
|
||||
if (!pdata->index_size)
|
||||
return NULL;
|
||||
|
||||
i = locate_object_entry_hash(pdata, sha1, &found);
|
||||
|
||||
if (index_pos)
|
||||
*index_pos = i;
|
||||
|
||||
if (!found)
|
||||
return NULL;
|
||||
|
||||
return &pdata->objects[pdata->index[i] - 1];
|
||||
}
|
||||
|
||||
struct object_entry *packlist_alloc(struct packing_data *pdata,
|
||||
const unsigned char *sha1,
|
||||
uint32_t index_pos)
|
||||
{
|
||||
struct object_entry *new_entry;
|
||||
|
||||
if (pdata->nr_objects >= pdata->nr_alloc) {
|
||||
pdata->nr_alloc = (pdata->nr_alloc + 1024) * 3 / 2;
|
||||
pdata->objects = xrealloc(pdata->objects,
|
||||
pdata->nr_alloc * sizeof(*new_entry));
|
||||
}
|
||||
|
||||
new_entry = pdata->objects + pdata->nr_objects++;
|
||||
|
||||
memset(new_entry, 0, sizeof(*new_entry));
|
||||
hashcpy(new_entry->idx.sha1, sha1);
|
||||
|
||||
if (pdata->index_size * 3 <= pdata->nr_objects * 4)
|
||||
rehash_objects(pdata);
|
||||
else
|
||||
pdata->index[index_pos] = pdata->nr_objects;
|
||||
|
||||
return new_entry;
|
||||
}
|
||||
|
|
@ -0,0 +1,47 @@
|
|||
#ifndef PACK_OBJECTS_H
|
||||
#define PACK_OBJECTS_H
|
||||
|
||||
struct object_entry {
|
||||
struct pack_idx_entry idx;
|
||||
unsigned long size; /* uncompressed size */
|
||||
struct packed_git *in_pack; /* already in pack */
|
||||
off_t in_pack_offset;
|
||||
struct object_entry *delta; /* delta base object */
|
||||
struct object_entry *delta_child; /* deltified objects who bases me */
|
||||
struct object_entry *delta_sibling; /* other deltified objects who
|
||||
* uses the same base as me
|
||||
*/
|
||||
void *delta_data; /* cached delta (uncompressed) */
|
||||
unsigned long delta_size; /* delta data size (uncompressed) */
|
||||
unsigned long z_delta_size; /* delta data size (compressed) */
|
||||
enum object_type type;
|
||||
enum object_type in_pack_type; /* could be delta */
|
||||
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 */
|
||||
};
|
||||
|
||||
struct packing_data {
|
||||
struct object_entry *objects;
|
||||
uint32_t nr_objects, nr_alloc;
|
||||
|
||||
int32_t *index;
|
||||
uint32_t index_size;
|
||||
};
|
||||
|
||||
struct object_entry *packlist_alloc(struct packing_data *pdata,
|
||||
const unsigned char *sha1,
|
||||
uint32_t index_pos);
|
||||
|
||||
struct object_entry *packlist_find(struct packing_data *pdata,
|
||||
const unsigned char *sha1,
|
||||
uint32_t *index_pos);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue