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From: Derrick Stolee <dstolee@microsoft.com>
To: "git@vger.kernel.org" <git@vger.kernel.org>
Cc: "gitster@pobox.com" <gitster@pobox.com>,
	"stolee@gmail.com" <stolee@gmail.com>,
	"peff@peff.net" <peff@peff.net>,
	"jnareb@gmail.com" <jnareb@gmail.com>,
	"avarab@gmail.com" <avarab@gmail.com>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: [PATCH v5 08/11] commit: add short-circuit to paint_down_to_common()
Date: Tue, 1 May 2018 12:47:19 +0000	[thread overview]
Message-ID: <20180501124652.155781-9-dstolee@microsoft.com> (raw)
In-Reply-To: <20180501124652.155781-1-dstolee@microsoft.com>

When running 'git branch --contains', the in_merge_bases_many()
method calls paint_down_to_common() to discover if a specific
commit is reachable from a set of branches. Commits with lower
generation number are not needed to correctly answer the
containment query of in_merge_bases_many().

Add a new parameter, min_generation, to paint_down_to_common() that
prevents walking commits with generation number strictly less than
min_generation. If 0 is given, then there is no functional change.

For in_merge_bases_many(), we can pass commit->generation as the
cutoff, and this saves time during 'git branch --contains' queries
that would otherwise walk "around" the commit we are inspecting.

For a copy of the Linux repository, where HEAD is checked out at
v4.13~100, we get the following performance improvement for
'git branch --contains' over the previous commit:

Before: 0.21s
After:  0.13s
Rel %: -38%

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 commit.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/commit.c b/commit.c
index 3ecdc13356..9875feec01 100644
--- a/commit.c
+++ b/commit.c
@@ -808,11 +808,14 @@ static int queue_has_nonstale(struct prio_queue *queue)
 }
 
 /* all input commits in one and twos[] must have been parsed! */
-static struct commit_list *paint_down_to_common(struct commit *one, int n, struct commit **twos)
+static struct commit_list *paint_down_to_common(struct commit *one, int n,
+						struct commit **twos,
+						int min_generation)
 {
 	struct prio_queue queue = { compare_commits_by_gen_then_commit_date };
 	struct commit_list *result = NULL;
 	int i;
+	uint32_t last_gen = GENERATION_NUMBER_INFINITY;
 
 	one->object.flags |= PARENT1;
 	if (!n) {
@@ -831,6 +834,15 @@ static struct commit_list *paint_down_to_common(struct commit *one, int n, struc
 		struct commit_list *parents;
 		int flags;
 
+		if (commit->generation > last_gen)
+			BUG("bad generation skip %8x > %8x at %s",
+			    commit->generation, last_gen,
+			    oid_to_hex(&commit->object.oid));
+		last_gen = commit->generation;
+
+		if (commit->generation < min_generation)
+			break;
+
 		flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
 		if (flags == (PARENT1 | PARENT2)) {
 			if (!(commit->object.flags & RESULT)) {
@@ -879,7 +891,7 @@ static struct commit_list *merge_bases_many(struct commit *one, int n, struct co
 			return NULL;
 	}
 
-	list = paint_down_to_common(one, n, twos);
+	list = paint_down_to_common(one, n, twos, 0);
 
 	while (list) {
 		struct commit *commit = pop_commit(&list);
@@ -946,7 +958,7 @@ static int remove_redundant(struct commit **array, int cnt)
 			filled_index[filled] = j;
 			work[filled++] = array[j];
 		}
-		common = paint_down_to_common(array[i], filled, work);
+		common = paint_down_to_common(array[i], filled, work, 0);
 		if (array[i]->object.flags & PARENT2)
 			redundant[i] = 1;
 		for (j = 0; j < filled; j++)
@@ -1070,7 +1082,7 @@ int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit *
 	if (commit->generation > min_generation)
 		return ret;
 
-	bases = paint_down_to_common(commit, nr_reference, reference);
+	bases = paint_down_to_common(commit, nr_reference, reference, commit->generation);
 	if (commit->object.flags & PARENT2)
 		ret = 1;
 	clear_commit_marks(commit, all_flags);
-- 
2.17.0.39.g685157f7fb


  parent reply	other threads:[~2018-05-01 12:47 UTC|newest]

Thread overview: 162+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-03 16:51 [PATCH 0/6] Compute and consume generation numbers Derrick Stolee
2018-04-03 16:51 ` [PATCH 1/6] object.c: parse commit in graph first Derrick Stolee
2018-04-03 18:21   ` Jonathan Tan
2018-04-03 18:28     ` Jeff King
2018-04-03 18:32       ` Derrick Stolee
2018-04-03 16:51 ` [PATCH 2/6] commit: add generation number to struct commmit Derrick Stolee
2018-04-03 18:05   ` Brandon Williams
2018-04-03 18:28     ` Jeff King
2018-04-03 18:31       ` Derrick Stolee
2018-04-03 18:32       ` Brandon Williams
2018-04-03 18:44       ` Stefan Beller
2018-04-03 23:17       ` Ramsay Jones
2018-04-03 23:19         ` Jeff King
2018-04-03 18:24   ` Jonathan Tan
2018-04-03 16:51 ` [PATCH 3/6] commit-graph: compute generation numbers Derrick Stolee
2018-04-03 18:30   ` Jonathan Tan
2018-04-03 18:49     ` Stefan Beller
2018-04-03 16:51 ` [PATCH 4/6] commit: use generations in paint_down_to_common() Derrick Stolee
2018-04-03 18:31   ` Stefan Beller
2018-04-03 18:31   ` Jonathan Tan
2018-04-03 16:51 ` [PATCH 5/6] commit.c: use generation to halt paint walk Derrick Stolee
2018-04-03 19:01   ` Jonathan Tan
2018-04-03 16:51 ` [PATCH 6/6] commit-graph.txt: update future work Derrick Stolee
2018-04-03 19:04   ` Jonathan Tan
2018-04-03 16:56 ` [PATCH 0/6] Compute and consume generation numbers Derrick Stolee
2018-04-03 18:03 ` Brandon Williams
2018-04-03 18:29   ` Derrick Stolee
2018-04-03 18:47     ` Jeff King
2018-04-03 19:05       ` Jeff King
2018-04-04 15:45         ` [PATCH 7/6] ref-filter: use generation number for --contains Derrick Stolee
2018-04-04 15:45           ` [PATCH 8/6] commit: use generation numbers for in_merge_bases() Derrick Stolee
2018-04-04 15:48             ` Derrick Stolee
2018-04-04 17:01               ` Brandon Williams
2018-04-04 18:24               ` Jeff King
2018-04-04 18:53                 ` Derrick Stolee
2018-04-04 18:59                   ` Jeff King
2018-04-04 18:22           ` [PATCH 7/6] ref-filter: use generation number for --contains Jeff King
2018-04-04 19:06             ` Derrick Stolee
2018-04-04 19:16               ` Jeff King
2018-04-04 19:22                 ` Derrick Stolee
2018-04-04 19:42                   ` Jeff King
2018-04-04 19:45                     ` Derrick Stolee
2018-04-04 19:46                       ` Jeff King
2018-04-07 17:09     ` [PATCH 0/6] Compute and consume generation numbers Jakub Narebski
2018-04-07 16:55 ` Jakub Narebski
2018-04-08  1:06   ` Derrick Stolee
2018-04-11 19:32     ` Jakub Narebski
2018-04-11 19:58       ` Derrick Stolee
2018-04-14 16:52         ` Jakub Narebski
2018-04-21 20:44           ` Jakub Narebski
2018-04-23 13:54             ` Derrick Stolee
2018-04-09 16:41 ` [PATCH v2 00/10] " Derrick Stolee
2018-04-09 16:41   ` [PATCH v2 01/10] object.c: parse commit in graph first Derrick Stolee
2018-04-09 16:41   ` [PATCH v2 02/10] merge: check config before loading commits Derrick Stolee
2018-04-11  2:12     ` Junio C Hamano
2018-04-11 12:49       ` Derrick Stolee
2018-04-09 16:42   ` [PATCH v2 03/10] commit: add generation number to struct commmit Derrick Stolee
2018-04-09 17:59     ` Stefan Beller
2018-04-11  2:31     ` Junio C Hamano
2018-04-11 12:57       ` Derrick Stolee
2018-04-11 23:28         ` Junio C Hamano
2018-04-09 16:42   ` [PATCH v2 04/10] commit-graph: compute generation numbers Derrick Stolee
2018-04-11  2:51     ` Junio C Hamano
2018-04-11 13:02       ` Derrick Stolee
2018-04-11 18:49         ` Stefan Beller
2018-04-11 19:26         ` Eric Sunshine
2018-04-09 16:42   ` [PATCH v2 05/10] commit: use generations in paint_down_to_common() Derrick Stolee
2018-04-09 16:42   ` [PATCH v2 06/10] commit.c: use generation to halt paint walk Derrick Stolee
2018-04-11  3:02     ` Junio C Hamano
2018-04-11 13:24       ` Derrick Stolee
2018-04-09 16:42   ` [PATCH v2 07/10] commit-graph.txt: update future work Derrick Stolee
2018-04-12  9:12     ` Junio C Hamano
2018-04-12 11:35       ` Derrick Stolee
2018-04-13  9:53         ` Jakub Narebski
2018-04-09 16:42   ` [PATCH v2 08/10] ref-filter: use generation number for --contains Derrick Stolee
2018-04-09 16:42   ` [PATCH v2 09/10] commit: use generation numbers for in_merge_bases() Derrick Stolee
2018-04-09 16:42   ` [PATCH v2 10/10] commit: add short-circuit to paint_down_to_common() Derrick Stolee
2018-04-17 17:00   ` [PATCH v3 0/9] Compute and consume generation numbers Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 1/9] commit: add generation number to struct commmit Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 2/9] commit-graph: compute generation numbers Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 3/9] commit: use generations in paint_down_to_common() Derrick Stolee
2018-04-18 14:31       ` Jakub Narebski
2018-04-18 14:46         ` Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 4/9] commit-graph.txt: update design document Derrick Stolee
2018-04-18 19:47       ` Jakub Narebski
2018-04-17 17:00     ` [PATCH v3 5/9] ref-filter: use generation number for --contains Derrick Stolee
2018-04-18 21:02       ` Jakub Narebski
2018-04-23 14:22         ` Derrick Stolee
2018-04-24 18:56           ` Jakub Narebski
2018-04-25 14:11             ` Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 6/9] commit: use generation numbers for in_merge_bases() Derrick Stolee
2018-04-18 22:15       ` Jakub Narebski
2018-04-23 14:31         ` Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 7/9] commit: add short-circuit to paint_down_to_common() Derrick Stolee
2018-04-18 23:19       ` Jakub Narebski
2018-04-23 14:40         ` Derrick Stolee
2018-04-23 21:38           ` Jakub Narebski
2018-04-24 12:31             ` Derrick Stolee
2018-04-19  8:32       ` Jakub Narebski
2018-04-17 17:00     ` [PATCH v3 8/9] commit-graph: always load commit-graph information Derrick Stolee
2018-04-17 17:50       ` Derrick Stolee
2018-04-19  0:02       ` Jakub Narebski
2018-04-23 14:49         ` Derrick Stolee
2018-04-17 17:00     ` [PATCH v3 9/9] merge: check config before loading commits Derrick Stolee
2018-04-19  0:04     ` [PATCH v3 0/9] Compute and consume generation numbers Jakub Narebski
2018-04-23 14:54       ` Derrick Stolee
2018-04-25 14:37     ` [PATCH v4 00/10] " Derrick Stolee
2018-04-25 14:37       ` [PATCH v4 01/10] ref-filter: fix outdated comment on in_commit_list Derrick Stolee
2018-04-28 17:54         ` Jakub Narebski
2018-04-25 14:37       ` [PATCH v4 02/10] commit: add generation number to struct commmit Derrick Stolee
2018-04-28 22:35         ` Jakub Narebski
2018-04-30 12:05           ` Derrick Stolee
2018-04-25 14:37       ` [PATCH v4 03/10] commit-graph: compute generation numbers Derrick Stolee
2018-04-26  2:35         ` Junio C Hamano
2018-04-26 12:58           ` Derrick Stolee
2018-04-26 13:49             ` Derrick Stolee
2018-04-29  9:08         ` Jakub Narebski
2018-05-01 12:10           ` Derrick Stolee
2018-05-02 16:15             ` Jakub Narebski
2018-04-25 14:37       ` [PATCH v4 04/10] commit: use generations in paint_down_to_common() Derrick Stolee
2018-04-26  3:22         ` Junio C Hamano
2018-04-26  9:02           ` Jakub Narebski
2018-04-28 14:38             ` Jakub Narebski
2018-04-29 15:40         ` Jakub Narebski
2018-04-25 14:37       ` [PATCH v4 06/10] ref-filter: use generation number for --contains Derrick Stolee
2018-04-30 16:34         ` Jakub Narebski
2018-04-25 14:37       ` [PATCH v4 05/10] commit-graph: always load commit-graph information Derrick Stolee
2018-04-29 22:14         ` Jakub Narebski
2018-05-01 12:19           ` Derrick Stolee
2018-04-29 22:18         ` Jakub Narebski
2018-04-25 14:37       ` [PATCH v4 07/10] commit: use generation numbers for in_merge_bases() Derrick Stolee
2018-04-30 17:05         ` Jakub Narebski
2018-04-25 14:38       ` [PATCH v4 08/10] commit: add short-circuit to paint_down_to_common() Derrick Stolee
2018-04-30 22:19         ` Jakub Narebski
2018-05-01 11:47           ` Derrick Stolee
2018-05-02 13:05             ` Jakub Narebski
2018-05-02 13:42               ` Derrick Stolee
2018-04-25 14:38       ` [PATCH v4 09/10] merge: check config before loading commits Derrick Stolee
2018-04-30 22:54         ` Jakub Narebski
2018-05-01 11:52           ` Derrick Stolee
2018-05-02 11:41             ` Jakub Narebski
2018-04-25 14:38       ` [PATCH v4 10/10] commit-graph.txt: update design document Derrick Stolee
2018-04-30 23:32         ` Jakub Narebski
2018-05-01 12:00           ` Derrick Stolee
2018-05-02  7:57             ` Jakub Narebski
2018-04-25 14:40       ` [PATCH v4 00/10] Compute and consume generation numbers Derrick Stolee
2018-04-28 17:28         ` Jakub Narebski
2018-05-01 12:47       ` [PATCH v5 00/11] " Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 01/11] ref-filter: fix outdated comment on in_commit_list Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 02/11] commit: add generation number to struct commmit Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 03/11] commit-graph: compute generation numbers Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 04/11] commit: use generations in paint_down_to_common() Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 05/11] commit-graph: always load commit-graph information Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 06/11] ref-filter: use generation number for --contains Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 07/11] commit: use generation numbers for in_merge_bases() Derrick Stolee
2018-05-01 12:47         ` Derrick Stolee [this message]
2018-05-01 12:47         ` [PATCH v5 09/11] commit: use generation number in remove_redundant() Derrick Stolee
2018-05-01 15:37           ` Derrick Stolee
2018-05-03 18:45           ` Jakub Narebski
2018-05-01 12:47         ` [PATCH v5 10/11] merge: check config before loading commits Derrick Stolee
2018-05-01 12:47         ` [PATCH v5 11/11] commit-graph.txt: update design document Derrick Stolee
2018-05-03 11:18         ` [PATCH v5 00/11] Compute and consume generation numbers Jakub Narebski

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