From patchwork Wed Dec 19 12:14:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Xin X-Patchwork-Id: 10737163 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28DA26C2 for ; Wed, 19 Dec 2018 12:15:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 17B4C29BD2 for ; Wed, 19 Dec 2018 12:15:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0BAEC29F17; Wed, 19 Dec 2018 12:15:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D66C729BD2 for ; Wed, 19 Dec 2018 12:15:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728760AbeLSMPF (ORCPT ); Wed, 19 Dec 2018 07:15:05 -0500 Received: from mail-ot1-f66.google.com ([209.85.210.66]:45798 "EHLO mail-ot1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726631AbeLSMPF (ORCPT ); Wed, 19 Dec 2018 07:15:05 -0500 Received: by mail-ot1-f66.google.com with SMTP id 32so18850064ota.12 for ; Wed, 19 Dec 2018 04:15:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GV6AoTMF1HqRtZ3u1CauuFkkwx8IdAOFc2CY6PD1Sjo=; b=YAFzh8xbY4Sa3DM7YWh+8yf/HkYuljnj4b8sVEdIbcOOWTN4hCOD1kKMJYDRTnA6hD ZJp4LSrERTCGGQY5TOIObVOQyjGqz+2u132ptnMw5f9O//x9IxECWbD3QqEgvv4mo+np FKYqEVXHiX5vFchtsneHBqxmvymiIaUOlgDosj0dnMFnNG/quKfTS0/Axwwe8ZmKF4aa d1HPshxWKZ0nzJyNT8hPKQ03GjlNbyLxzKAYiGba6T2wyRYGbECAut6Pl106ZrQ0GWqB QIA68Zn0Qb+FttheviT7Cslv3GTg1fm1NCYDeA5TWqbPSsgK9aKOqdqoFlaq3nzUpWDL pdrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=GV6AoTMF1HqRtZ3u1CauuFkkwx8IdAOFc2CY6PD1Sjo=; b=imwbB87Y1xQ9aCVsIrZEKswTN7khn+sKQdYxYBVlPNXg8vifEV6CUqHJcoQM1ABVPK GuCgrfT5RV4C23JIjtafy9lgJvq5RL6Dy7AjP9XtI4eK1LRlbRVS7zCyoLKfJG4aE9bl 2UCKyrAE5iz9lu/ncM9dqH7b9MyekI23ms3xbdnIlBFtHrFRTlcQoQiG5+s8HZ1nNhbm IUbRCCTS/yLQkqZDhVTHKbMIjsyaNlgFs4lhkQNWSgYDgxx5u1T8K7UvMCHiyt4JUhqi NdOjaYWWETQjTM9gV+VD/AZThpZ9ENFTf43o+JNMHNhXcO+RPzPt9QWO1KgL5kbDODci Oq5A== X-Gm-Message-State: AA+aEWacWtBj3+7RDzTJv2+MJJwEIYwjaeVM9JAeGMZ4h5+OFscVVKuC OS828EJUB406IrBqRCHNcKO5HC4gd4M= X-Google-Smtp-Source: AFSGD/W4ELFkjeySKsIObUszOgqVB4wtr2CQ+Xk7Qa2vo/n089Q+XMPsPHGiFgBxVG7SgTIF2zOv7w== X-Received: by 2002:a9d:6552:: with SMTP id q18mr15123584otl.128.1545221704150; Wed, 19 Dec 2018 04:15:04 -0800 (PST) Received: from localhost.localdomain ([205.204.117.9]) by smtp.gmail.com with ESMTPSA id e128sm8826357oia.5.2018.12.19.04.15.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Dec 2018 04:15:03 -0800 (PST) From: Jiang Xin To: Git List Cc: Jiang Xin , Sun Chao , Jiang Xin Subject: [PATCH v2 1/3] t5322: test cases for git-pack-redundant Date: Wed, 19 Dec 2018 20:14:49 +0800 Message-Id: <20181219121451.21697-2-worldhello.net@gmail.com> X-Mailer: git-send-email 2.20.0.3.gc45e608566 In-Reply-To: <20181218095829.20092-2-worldhello.net@gmail.com> References: <20181218095829.20092-2-worldhello.net@gmail.com> MIME-Version: 1.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jiang Xin Add test cases for git pack-redundant to validate new algorithm for git pack-redundant. Signed-off-by: Jiang Xin --- t/t5322-pack-redundant.sh | 69 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100755 t/t5322-pack-redundant.sh diff --git a/t/t5322-pack-redundant.sh b/t/t5322-pack-redundant.sh new file mode 100755 index 0000000000..4add9c2bb1 --- /dev/null +++ b/t/t5322-pack-redundant.sh @@ -0,0 +1,69 @@ +#!/bin/sh +# +# Copyright (c) 2018 Jiang Xin +# + +test_description='git redundant test' + +. ./test-lib.sh + +create_commits() +{ + set -e + parent= + for name in A B C D E F G H I J K L M + do + test_tick + T=$(git write-tree) + if test -z "$parent" + then + sha1=$(echo $name | git commit-tree $T) + else + sha1=$(echo $name | git commit-tree -p $parent $T) + fi + eval $name=$sha1 + parent=$sha1 + done + git update-ref refs/heads/master $M +} + +create_redundant_packs() +{ + set -e + cd .git/objects/pack + P1=$(printf "$T\n$A\n" | git pack-objects pack 2>/dev/null) + P2=$(printf "$T\n$A\n$B\n$C\n$D\n$E\n" | git pack-objects pack 2>/dev/null) + P3=$(printf "$C\n$D\n$F\n$G\n$I\n$J\n" | git pack-objects pack 2>/dev/null) + P4=$(printf "$D\n$E\n$G\n$H\n$J\n$K\n" | git pack-objects pack 2>/dev/null) + P5=$(printf "$F\n$G\n$H\n" | git pack-objects pack 2>/dev/null) + P6=$(printf "$F\n$I\n$L\n" | git pack-objects pack 2>/dev/null) + P7=$(printf "$H\n$K\n$M\n" | git pack-objects pack 2>/dev/null) + P8=$(printf "$L\n$M\n" | git pack-objects pack 2>/dev/null) + cd - +} + +# Create commits and packs +create_commits +create_redundant_packs + +test_expect_success 'clear loose objects' ' + git prune-packed && + test $(find .git/objects -type f | grep -v pack | wc -l) -eq 0 +' + +printf "$P1\n$P4\n$P5\n$P6\n" | sort >expected + +test_expect_success 'git pack-redundant --all' ' + git pack-redundant --all | \ + sed -e "s#^.*/pack-\(.*\)\.\(idx\|pack\)#\1#g" | \ + sort -u >actual && + test_cmp expected actual +' + +test_expect_success 'remove redundant packs' ' + git pack-redundant --all | xargs rm && + git fsck && + test $(git pack-redundant --all | wc -l) -eq 0 +' + +test_done From patchwork Wed Dec 19 12:14:50 2018 Content-Type: text/plain; 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Wed, 19 Dec 2018 04:15:06 -0800 (PST) From: Jiang Xin To: Git List Cc: Sun Chao , Jiang Xin Subject: [PATCH v2 2/3] pack-redundant: new algorithm to find min packs Date: Wed, 19 Dec 2018 20:14:50 +0800 Message-Id: <20181219121451.21697-3-worldhello.net@gmail.com> X-Mailer: git-send-email 2.20.0.3.gc45e608566 In-Reply-To: <20181218095829.20092-2-worldhello.net@gmail.com> References: <20181218095829.20092-2-worldhello.net@gmail.com> MIME-Version: 1.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sun Chao When calling `git pack-redundant --all`, if there are too many local packs and too many redundant objects within them, the too deep iteration of `get_permutations` will exhaust all the resources, and the process of `git pack-redundant` will be killed. The following script could create a repository with too many redundant packs, and running `git pack-redundant --all` in the `test.git` repo will die soon. #!/bin/sh repo="$(pwd)/test.git" work="$(pwd)/test" i=1 max=199 if test -d "$repo" || test -d "$work"; then echo >&2 "ERROR: '$repo' or '$work' already exist" exit 1 fi git init -q --bare "$repo" git --git-dir="$repo" config gc.auto 0 git --git-dir="$repo" config transfer.unpackLimit 0 git clone -q "$repo" "$work" 2>/dev/null while :; do cd "$work" echo "loop $i: $(date +%s)" >$i git add $i git commit -q -sm "loop $i" git push -q origin HEAD:master printf "\rCreate pack %4d/%d\t" $i $max if test $i -ge $max; then break; fi cd "$repo" git repack -q if test $(($i % 2)) -eq 0; then git repack -aq pack=$(ls -t $repo/objects/pack/*.pack | head -1) touch "${pack%.pack}.keep" fi i=$((i+1)) done printf "\ndone\n" To get the `min` unique pack list, we can replace the iteration in `minimize` function with a new algorithm, and this could solve this issue: 1. Get the unique and non_uniqe packs, add the unique packs to the `min` list. 2. Remove the objects of unique packs from non_unique packs, then each object left in the non_unique packs will have at least two copies. 3. Sort the non_unique packs by the objects' size, more objects first, and add the first non_unique pack to `min` list. 4. Drop the duplicated objects from other packs in the ordered non_unique pack list, and repeat step 3. Original PR and discussions: https://github.com/jiangxin/git/pull/25 Signed-off-by: Sun Chao Signed-off-by: Jiang Xin --- builtin/pack-redundant.c | 109 ++++++++++++++++++++++++--------------- 1 file changed, 68 insertions(+), 41 deletions(-) diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c index cf9a9aabd4..3655cc7dc6 100644 --- a/builtin/pack-redundant.c +++ b/builtin/pack-redundant.c @@ -421,14 +421,52 @@ static inline off_t pack_set_bytecount(struct pack_list *pl) return ret; } +static int cmp_pack_list_reverse(const void *a, const void *b) +{ + struct pack_list *pl_a = *((struct pack_list **)a); + struct pack_list *pl_b = *((struct pack_list **)b); + size_t sz_a = pl_a->all_objects->size; + size_t sz_b = pl_b->all_objects->size; + + if (sz_a == sz_b) + return 0; + else if (sz_a < sz_b) + return 1; + else + return -1; +} + +/* Sort pack_list, greater size of all_objects first */ +static void sort_pack_list(struct pack_list **pl) +{ + struct pack_list **ary, *p; + int i; + size_t n = pack_list_size(*pl); + + if (n < 2) + return; + + /* prepare an array of packed_list for easier sorting */ + ary = xcalloc(n, sizeof(struct pack_list *)); + for (n = 0, p = *pl; p; p = p->next) + ary[n++] = p; + + QSORT(ary, n, cmp_pack_list_reverse); + + /* link them back again */ + for (i = 0; i < n - 1; i++) + ary[i]->next = ary[i + 1]; + ary[n - 1]->next = NULL; + *pl = ary[0]; + + free(ary); +} + + static void minimize(struct pack_list **min) { - struct pack_list *pl, *unique = NULL, - *non_unique = NULL, *min_perm = NULL; - struct pll *perm, *perm_all, *perm_ok = NULL, *new_perm; - struct llist *missing; - off_t min_perm_size = 0, perm_size; - int n; + struct pack_list *pl, *unique = NULL, *non_unique = NULL; + struct llist *missing, *unique_pack_objects; pl = local_packs; while (pl) { @@ -446,49 +484,37 @@ static void minimize(struct pack_list **min) pl = pl->next; } + *min = unique; + /* return if there are no objects missing from the unique set */ if (missing->size == 0) { - *min = unique; free(missing); return; } - /* find the permutations which contain all missing objects */ - for (n = 1; n <= pack_list_size(non_unique) && !perm_ok; n++) { - perm_all = perm = get_permutations(non_unique, n); - while (perm) { - if (is_superset(perm->pl, missing)) { - new_perm = xmalloc(sizeof(struct pll)); - memcpy(new_perm, perm, sizeof(struct pll)); - new_perm->next = perm_ok; - perm_ok = new_perm; - } - perm = perm->next; - } - if (perm_ok) - break; - pll_free(perm_all); - } - if (perm_ok == NULL) - die("Internal error: No complete sets found!"); - - /* find the permutation with the smallest size */ - perm = perm_ok; - while (perm) { - perm_size = pack_set_bytecount(perm->pl); - if (!min_perm_size || min_perm_size > perm_size) { - min_perm_size = perm_size; - min_perm = perm->pl; - } - perm = perm->next; - } - *min = min_perm; - /* add the unique packs to the list */ - pl = unique; + unique_pack_objects = llist_copy(all_objects); + llist_sorted_difference_inplace(unique_pack_objects, missing); + + /* remove unique pack objects from the non_unique packs */ + pl = non_unique; while (pl) { - pack_list_insert(min, pl); + llist_sorted_difference_inplace(pl->all_objects, unique_pack_objects); pl = pl->next; } + + while (non_unique) { + /* sort the non_unique packs, greater size of all_objects first */ + sort_pack_list(&non_unique); + if (non_unique->all_objects->size == 0) + break; + + pack_list_insert(min, non_unique); + + for (pl = non_unique->next; pl && pl->all_objects->size > 0; pl = pl->next) + llist_sorted_difference_inplace(pl->all_objects, non_unique->all_objects); + + non_unique = non_unique->next; + } } static void load_all_objects(void) @@ -603,7 +629,7 @@ static void load_all(void) int cmd_pack_redundant(int argc, const char **argv, const char *prefix) { int i; - struct pack_list *min, *red, *pl; + struct pack_list *min = NULL, *red, *pl; struct llist *ignore; struct object_id *oid; char buf[GIT_MAX_HEXSZ + 2]; /* hex hash + \n + \0 */ @@ -664,6 +690,7 @@ int cmd_pack_redundant(int argc, const char **argv, const char *prefix) pl = local_packs; while (pl) { llist_sorted_difference_inplace(pl->unique_objects, ignore); + llist_sorted_difference_inplace(pl->all_objects, ignore); pl = pl->next; } From patchwork Wed Dec 19 12:14:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Xin X-Patchwork-Id: 10737167 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0C9376C2 for ; Wed, 19 Dec 2018 12:15:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F03DD29CAE for ; Wed, 19 Dec 2018 12:15:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E4E7629F17; Wed, 19 Dec 2018 12:15:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8DFC229CAE for ; 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Wed, 19 Dec 2018 04:15:08 -0800 (PST) From: Jiang Xin To: Git List Cc: Sun Chao , Jiang Xin Subject: [PATCH v2 3/3] pack-redundant: remove unused functions Date: Wed, 19 Dec 2018 20:14:51 +0800 Message-Id: <20181219121451.21697-4-worldhello.net@gmail.com> X-Mailer: git-send-email 2.20.0.3.gc45e608566 In-Reply-To: <20181218095829.20092-2-worldhello.net@gmail.com> References: <20181218095829.20092-2-worldhello.net@gmail.com> MIME-Version: 1.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sun Chao Remove unused functions to find `min` packs, such as `get_permutations`, `pll_free`, etc. Signed-off-by: Sun Chao Signed-off-by: Jiang Xin --- builtin/pack-redundant.c | 72 ---------------------------------------- 1 file changed, 72 deletions(-) diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c index 3655cc7dc6..9630117c90 100644 --- a/builtin/pack-redundant.c +++ b/builtin/pack-redundant.c @@ -285,78 +285,6 @@ static void cmp_two_packs(struct pack_list *p1, struct pack_list *p2) } } -static void pll_free(struct pll *l) -{ - struct pll *old; - struct pack_list *opl; - - while (l) { - old = l; - while (l->pl) { - opl = l->pl; - l->pl = opl->next; - free(opl); - } - l = l->next; - free(old); - } -} - -/* all the permutations have to be free()d at the same time, - * since they refer to each other - */ -static struct pll * get_permutations(struct pack_list *list, int n) -{ - struct pll *subset, *ret = NULL, *new_pll = NULL; - - if (list == NULL || pack_list_size(list) < n || n == 0) - return NULL; - - if (n == 1) { - while (list) { - new_pll = xmalloc(sizeof(*new_pll)); - new_pll->pl = NULL; - pack_list_insert(&new_pll->pl, list); - new_pll->next = ret; - ret = new_pll; - list = list->next; - } - return ret; - } - - while (list->next) { - subset = get_permutations(list->next, n - 1); - while (subset) { - new_pll = xmalloc(sizeof(*new_pll)); - new_pll->pl = subset->pl; - pack_list_insert(&new_pll->pl, list); - new_pll->next = ret; - ret = new_pll; - subset = subset->next; - } - list = list->next; - } - return ret; -} - -static int is_superset(struct pack_list *pl, struct llist *list) -{ - struct llist *diff; - - diff = llist_copy(list); - - while (pl) { - llist_sorted_difference_inplace(diff, pl->all_objects); - if (diff->size == 0) { /* we're done */ - llist_free(diff); - return 1; - } - pl = pl->next; - } - llist_free(diff); - return 0; -} - static size_t sizeof_union(struct packed_git *p1, struct packed_git *p2) { size_t ret = 0;