From: Junio C Hamano Date: Thu, 9 Aug 2007 20:42:50 +0000 (-0700) Subject: Optimize "diff --cached" performance. X-Git-Tag: v1.5.3-rc5~41 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=af3785dc5a76f4d5ddb8039e33c322e0e8b60e72;p=git.git Optimize "diff --cached" performance. The read_tree() function is called only from the call chain to run "git diff --cached" (this includes the internal call made by git-runstatus to run_diff_index()). The function vacates stage without any funky "merge" magic. The caller then goes and compares stage #1 entries from the tree with stage #0 entries from the original index. When adding the cache entries this way, it used the general purpose add_cache_entry(). This function looks for an existing entry to replace or if there is none to find where to insert the new entry, resolves D/F conflict and all the other things. For the purpose of reading entries into an empty stage, none of that processing is needed. We can instead append everything and then sort the result at the end. This commit changes read_tree() to first make sure that there is no existing cache entries at specified stage, and if that is the case, it runs add_cache_entry() with ADD_CACHE_JUST_APPEND flag (new), and then sort the resulting cache using qsort(). This new flag tells add_cache_entry() to omit all the checks such as "Does this path already exist? Does adding this path remove other existing entries because it turns a directory to a file?" and instead append the given cache entry straight at the end of the active cache. The caller of course is expected to sort the resulting cache at the end before using the result. Signed-off-by: Junio C Hamano --- diff --git a/cache.h b/cache.h index e97af18ee..e5276e6ad 100644 --- a/cache.h +++ b/cache.h @@ -258,6 +258,7 @@ extern int index_name_pos(struct index_state *, const char *name, int namelen); #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */ #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */ #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */ +#define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */ extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option); extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really); extern int remove_index_entry_at(struct index_state *, int pos); diff --git a/read-cache.c b/read-cache.c index e060392d1..865369df0 100644 --- a/read-cache.c +++ b/read-cache.c @@ -665,7 +665,7 @@ static int check_file_directory_conflict(struct index_state *istate, return retval + has_dir_name(istate, ce, pos, ok_to_replace); } -int add_index_entry(struct index_state *istate, struct cache_entry *ce, int option) +static int add_index_entry_with_check(struct index_state *istate, struct cache_entry *ce, int option) { int pos; int ok_to_add = option & ADD_CACHE_OK_TO_ADD; @@ -707,6 +707,22 @@ int add_index_entry(struct index_state *istate, struct cache_entry *ce, int opti pos = index_name_pos(istate, ce->name, ntohs(ce->ce_flags)); pos = -pos-1; } + return pos + 1; +} + +int add_index_entry(struct index_state *istate, struct cache_entry *ce, int option) +{ + int pos; + + if (option & ADD_CACHE_JUST_APPEND) + pos = istate->cache_nr; + else { + int ret; + ret = add_index_entry_with_check(istate, ce, option); + if (ret <= 0) + return ret; + pos = ret - 1; + } /* Make sure the array is big enough .. */ if (istate->cache_nr == istate->cache_alloc) { @@ -717,7 +733,7 @@ int add_index_entry(struct index_state *istate, struct cache_entry *ce, int opti /* Add it in.. */ istate->cache_nr++; - if (istate->cache_nr > pos) + if (istate->cache_nr > pos + 1) memmove(istate->cache + pos + 1, istate->cache + pos, (istate->cache_nr - pos - 1) * sizeof(ce)); diff --git a/tree.c b/tree.c index 04fe653a8..8c0819fa7 100644 --- a/tree.c +++ b/tree.c @@ -1,4 +1,5 @@ #include "cache.h" +#include "cache-tree.h" #include "tree.h" #include "blob.h" #include "commit.h" @@ -7,7 +8,7 @@ const char *tree_type = "tree"; -static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage) +static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt) { int len; unsigned int size; @@ -25,7 +26,23 @@ static int read_one_entry(const unsigned char *sha1, const char *base, int basel memcpy(ce->name, base, baselen); memcpy(ce->name + baselen, pathname, len+1); hashcpy(ce->sha1, sha1); - return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK); + return add_cache_entry(ce, opt); +} + +static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage) +{ + return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage, + ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK); +} + +/* + * This is used when the caller knows there is no existing entries at + * the stage that will conflict with the entry being added. + */ +static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage) +{ + return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage, + ADD_CACHE_JUST_APPEND); } static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths) @@ -119,9 +136,55 @@ int read_tree_recursive(struct tree *tree, return 0; } +static int cmp_cache_name_compare(const void *a_, const void *b_) +{ + const struct cache_entry *ce1, *ce2; + + ce1 = *((const struct cache_entry **)a_); + ce2 = *((const struct cache_entry **)b_); + return cache_name_compare(ce1->name, ntohs(ce1->ce_flags), + ce2->name, ntohs(ce2->ce_flags)); +} + int read_tree(struct tree *tree, int stage, const char **match) { - return read_tree_recursive(tree, "", 0, stage, match, read_one_entry); + read_tree_fn_t fn = NULL; + int i, err; + + /* + * Currently the only existing callers of this function all + * call it with stage=1 and after making sure there is nothing + * at that stage; we could always use read_one_entry_quick(). + * + * But when we decide to straighten out git-read-tree not to + * use unpack_trees() in some cases, this will probably start + * to matter. + */ + + /* + * See if we have cache entry at the stage. If so, + * do it the original slow way, otherwise, append and then + * sort at the end. + */ + for (i = 0; !fn && i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + if (ce_stage(ce) == stage) + fn = read_one_entry; + } + + if (!fn) + fn = read_one_entry_quick; + err = read_tree_recursive(tree, "", 0, stage, match, fn); + if (fn == read_one_entry || err) + return err; + + /* + * Sort the cache entry -- we need to nuke the cache tree, though. + */ + cache_tree_free(&active_cache_tree); + qsort(active_cache, active_nr, sizeof(active_cache[0]), + cmp_cache_name_compare); + return 0; } struct tree *lookup_tree(const unsigned char *sha1)