From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tanay Abhra Subject: [PATCH v3 3/6] rewrite git_config() to use the config-set API Date: Mon, 28 Jul 2014 03:33:52 -0700 Message-ID: <1406543635-19281-4-git-send-email-tanayabh@gmail.com> References: <1406543635-19281-1-git-send-email-tanayabh@gmail.com> Cc: Tanay Abhra , Ramkumar Ramachandra , Matthieu Moy To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Mon Jul 28 12:34:51 2014 Return-path: Envelope-to: gcvg-git-2@plane.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XBiGZ-0008L7-8d for gcvg-git-2@plane.gmane.org; Mon, 28 Jul 2014 12:34:51 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752199AbaG1Keq (ORCPT ); Mon, 28 Jul 2014 06:34:46 -0400 Received: from mail-pa0-f54.google.com ([209.85.220.54]:58656 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751478AbaG1Kep (ORCPT ); Mon, 28 Jul 2014 06:34:45 -0400 Received: by mail-pa0-f54.google.com with SMTP id fa1so10100735pad.41 for ; Mon, 28 Jul 2014 03:34:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Ru+FMNFoZpf1wFUWqW/KS7rpHvokq1GWVBIe2tSuXrA=; b=Tr0WZlvNBobaGEKjUUIDKotOF9jmQI+ZYp6uNWqsfsgGUgbmhXXdxmbPn25wdk0WCx Q1+ywtPpqrVfwsmVgnSxUuR8TYOZ6CrKP7ZWR5WxcUQimEG2kbxy64+TqikxyjsI9QJh +EjZbCNVG0dEABYljBFYoSWuy2ZATz2KF1sebKJW8OO7cVFV4ruY1ZtESq5raQFH8wKE NG98EvsJHMTCwGOAv10CgMvwsMurUsDcdvrEfniIQUOgCfA+eBgt9vSxfU630bgyFRz8 J3Kc8nxllNu4LeftPG6UN32rGbDMdp+SqbQ3ThrE4Zk/wdE7xV5d6cEC3ZyLGV/wy7f/ MKfg== X-Received: by 10.68.193.193 with SMTP id hq1mr37141286pbc.107.1406543681978; Mon, 28 Jul 2014 03:34:41 -0700 (PDT) Received: from localhost.localdomain ([106.211.56.253]) by mx.google.com with ESMTPSA id v8sm23639483pdr.45.2014.07.28.03.34.38 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 28 Jul 2014 03:34:41 -0700 (PDT) X-Mailer: git-send-email 1.9.0.GIT In-Reply-To: <1406543635-19281-1-git-send-email-tanayabh@gmail.com> Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: Of all the functions in `git_config*()` family, `git_config()` has the most invocations in the whole code base. Each `git_config()` invocation causes config file rereads which can be avoided using the config-set API. Use the config-set API to rewrite `git_config()` to use the config caching layer to avoid config file rereads on each invocation during a git process lifetime. First invocation constructs the cache, and after that for each successive invocation, `git_config()` feeds values from the config cache instead of rereading the configuration files. Signed-off-by: Tanay Abhra --- cache.h | 24 ++++++++++++++++++++++++ config.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++-------- 2 files changed, 73 insertions(+), 8 deletions(-) diff --git a/cache.h b/cache.h index 7292aef..93bdbab 100644 --- a/cache.h +++ b/cache.h @@ -8,6 +8,7 @@ #include "gettext.h" #include "convert.h" #include "trace.h" +#include "string-list.h" #include SHA1_HEADER #ifndef git_SHA_CTX @@ -1351,9 +1352,32 @@ extern int parse_config_key(const char *var, const char **subsection, int *subsection_len, const char **key); +struct config_set_element { + struct hashmap_entry ent; + char *key; + struct string_list value_list; +}; + +struct configset_list_item { + struct config_set_element *e; + int value_index; +}; + +/* + * the contents of the list are ordered according to their + * position in the config files and order of parsing the files. + * (i.e. key-value pair at the last position of .git/config will + * be at the last item of the list) + */ +struct configset_list { + struct configset_list_item *items; + unsigned int nr, alloc; +}; + struct config_set { struct hashmap config_hash; int hash_initialized; + struct configset_list list; }; extern void git_configset_init(struct config_set *cs); diff --git a/config.c b/config.c index 5499108..2ce3318 100644 --- a/config.c +++ b/config.c @@ -35,12 +35,6 @@ struct config_source { long (*do_ftell)(struct config_source *c); }; -struct config_set_element { - struct hashmap_entry ent; - char *key; - struct string_list value_list; -}; - static struct config_source *cf; static int zlib_compression_seen; @@ -1237,11 +1231,44 @@ struct key_value_info { int linenr; }; -int git_config(config_fn_t fn, void *data) +static int git_config_raw(config_fn_t fn, void *data) { return git_config_with_options(fn, data, NULL, 1); } +static int configset_iter(struct config_set *cs, config_fn_t fn, void *data) +{ + int i, value_index; + struct string_list *values; + struct config_set_element *entry; + struct configset_list *list = &cs->list; + struct key_value_info *kv_info; + + for (i = 0; i < list->nr; i++) { + entry = list->items[i].e; + value_index = list->items[i].value_index; + values = &entry->value_list; + if (fn(entry->key, values->items[value_index].string, data) < 0) { + kv_info = values->items[value_index].util; + if (!kv_info->linenr) + die("unable to parse command-line config"); + else + die("bad config file line %d in %s", + kv_info->linenr, + kv_info->filename); + } + } + return 0; +} + +static void git_config_check_init(void); + +int git_config(config_fn_t fn, void *data) +{ + git_config_check_init(); + return configset_iter(&the_config_set, fn, data); +} + static struct config_set_element *configset_find_element(struct config_set *cs, const char *key) { struct config_set_element k; @@ -1268,6 +1295,7 @@ static int configset_add_value(struct config_set *cs, const char *key, const cha { struct config_set_element *e; struct string_list_item *si; + struct configset_list_item *l_item; struct key_value_info *kv_info = xmalloc(sizeof(*kv_info)); e = configset_find_element(cs, key); @@ -1283,6 +1311,12 @@ static int configset_add_value(struct config_set *cs, const char *key, const cha hashmap_add(&cs->config_hash, e); } si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL); + + ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc); + l_item = &cs->list.items[cs->list.nr++]; + l_item->e = e; + l_item->value_index = e->value_list.nr - 1; + if (cf) { kv_info->filename = strintern(cf->name); kv_info->linenr = cf->linenr; @@ -1306,6 +1340,9 @@ void git_configset_init(struct config_set *cs) { hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0); cs->hash_initialized = 1; + cs->list.nr = 0; + cs->list.alloc = 0; + cs->list.items = NULL; } void git_configset_clear(struct config_set *cs) @@ -1322,6 +1359,10 @@ void git_configset_clear(struct config_set *cs) } hashmap_free(&cs->config_hash, 1); cs->hash_initialized = 0; + free(cs->list.items); + cs->list.nr = 0; + cs->list.alloc = 0; + cs->list.items = NULL; } static int config_set_callback(const char *key, const char *value, void *cb) @@ -1440,7 +1481,7 @@ static void git_config_check_init(void) if (the_config_set.hash_initialized) return; git_configset_init(&the_config_set); - git_config(config_set_callback, &the_config_set); + git_config_raw(config_set_callback, &the_config_set); } void git_config_clear(void) -- 1.9.0.GIT