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From: "Abhishek Kumar via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: "Derrick Stolee" <stolee@gmail.com>,
	"Jakub Narębski" <jnareb@gmail.com>,
	"Taylor Blau" <me@ttaylor.com>,
	"Abhishek Kumar" <abhishekkumar8222@gmail.com>,
	"Abhishek Kumar" <abhishekkumar8222@gmail.com>,
	"Abhishek Kumar" <abhishekkumar8222@gmail.com>
Subject: [PATCH v5 07/11] commit-graph: implement corrected commit date
Date: Mon, 28 Dec 2020 11:16:04 +0000	[thread overview]
Message-ID: <859c39eff52e32ad322969d024184971acec82e7.1609154168.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.676.v5.git.1609154168.gitgitgadget@gmail.com>

From: Abhishek Kumar <abhishekkumar8222@gmail.com>

With most of preparations done, let's implement corrected commit date.

The corrected commit date for a commit is defined as:

* A commit with no parents (a root commit) has corrected commit date
  equal to its committer date.
* A commit with at least one parent has corrected commit date equal to
  the maximum of its commit date and one more than the largest corrected
  commit date among its parents.

As a special case, a root commit with timestamp of zero (01.01.1970
00:00:00Z) has corrected commit date of one, to be able to distinguish
from GENERATION_NUMBER_ZERO (that is, an uncomputed corrected commit
date).

To minimize the space required to store corrected commit date, Git
stores corrected commit date offsets into the commit-graph file. The
corrected commit date offset for a commit is defined as the difference
between its corrected commit date and actual commit date.

Storing corrected commit date requires sizeof(timestamp_t) bytes, which
in most cases is 64 bits (uintmax_t). However, corrected commit date
offsets can be safely stored using only 32-bits. This halves the size
of GDAT chunk, which is a reduction of around 6% in the size of
commit-graph file.

However, using offsets be problematic if one of commits is malformed but
valid and has committerdate of 0 Unix time, as the offset would be the
same as corrected commit date and thus require 64-bits to be stored
properly.

While Git does not write out offsets at this stage, Git stores the
corrected commit dates in member generation of struct commit_graph_data.
It will begin writing commit date offsets with the introduction of
generation data chunk.

Signed-off-by: Abhishek Kumar <abhishekkumar8222@gmail.com>
---
 commit-graph.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/commit-graph.c b/commit-graph.c
index 1b2a015f92f..bfc3aae5f93 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1339,9 +1339,11 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 					ctx->commits.nr);
 	for (i = 0; i < ctx->commits.nr; i++) {
 		uint32_t level = *topo_level_slab_at(ctx->topo_levels, ctx->commits.list[i]);
+		timestamp_t corrected_commit_date = commit_graph_data_at(ctx->commits.list[i])->generation;
 
 		display_progress(ctx->progress, i + 1);
-		if (level != GENERATION_NUMBER_ZERO)
+		if (level != GENERATION_NUMBER_ZERO &&
+		    corrected_commit_date != GENERATION_NUMBER_ZERO)
 			continue;
 
 		commit_list_insert(ctx->commits.list[i], &list);
@@ -1350,16 +1352,23 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 			struct commit_list *parent;
 			int all_parents_computed = 1;
 			uint32_t max_level = 0;
+			timestamp_t max_corrected_commit_date = 0;
 
 			for (parent = current->parents; parent; parent = parent->next) {
 				level = *topo_level_slab_at(ctx->topo_levels, parent->item);
+				corrected_commit_date = commit_graph_data_at(parent->item)->generation;
 
-				if (level == GENERATION_NUMBER_ZERO) {
+				if (level == GENERATION_NUMBER_ZERO ||
+				    corrected_commit_date == GENERATION_NUMBER_ZERO) {
 					all_parents_computed = 0;
 					commit_list_insert(parent->item, &list);
 					break;
-				} else if (level > max_level) {
-					max_level = level;
+				} else {
+					if (level > max_level)
+						max_level = level;
+
+					if (corrected_commit_date > max_corrected_commit_date)
+						max_corrected_commit_date = corrected_commit_date;
 				}
 			}
 
@@ -1369,6 +1378,10 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 				if (max_level > GENERATION_NUMBER_V1_MAX - 1)
 					max_level = GENERATION_NUMBER_V1_MAX - 1;
 				*topo_level_slab_at(ctx->topo_levels, current) = max_level + 1;
+
+				if (current->date && current->date > max_corrected_commit_date)
+					max_corrected_commit_date = current->date - 1;
+				commit_graph_data_at(current)->generation = max_corrected_commit_date + 1;
 			}
 		}
 	}
-- 
gitgitgadget


  parent reply	other threads:[~2020-12-28 11:17 UTC|newest]

Thread overview: 211+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28  9:13 [PATCH 0/6] [GSoC] Implement Corrected Commit Date Abhishek Kumar via GitGitGadget
2020-07-28  9:13 ` [PATCH 1/6] commit-graph: fix regression when computing bloom filter Abhishek Kumar via GitGitGadget
2020-07-28 15:28   ` Taylor Blau
2020-07-30  5:24     ` Abhishek Kumar
2020-08-04  0:46   ` Jakub Narębski
2020-08-04  0:56     ` Taylor Blau
2020-08-04 10:10       ` Jakub Narębski
2020-08-04  7:55     ` Jakub Narębski
2020-07-28  9:13 ` [PATCH 2/6] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2020-07-28 13:00   ` Derrick Stolee
2020-07-28 15:30     ` Taylor Blau
2020-08-05 23:16   ` Jakub Narębski
2020-07-28  9:13 ` [PATCH 3/6] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2020-07-28 13:14   ` Derrick Stolee
2020-07-28 15:19     ` René Scharfe
2020-07-28 15:58       ` Derrick Stolee
2020-07-28 16:01     ` Taylor Blau
2020-07-30  6:07     ` Abhishek Kumar
2020-07-28  9:13 ` [PATCH 4/6] commit-graph: consolidate compare_commits_by_gen Abhishek Kumar via GitGitGadget
2020-07-28 16:03   ` Taylor Blau
2020-07-28  9:13 ` [PATCH 5/6] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2020-07-28 16:12   ` Taylor Blau
2020-07-30  6:52     ` Abhishek Kumar
2020-07-28  9:13 ` [PATCH 6/6] commit-graph: implement corrected commit date offset Abhishek Kumar via GitGitGadget
2020-07-28 15:55   ` Derrick Stolee
2020-07-28 16:23     ` Taylor Blau
2020-07-30  7:27     ` Abhishek Kumar
2020-07-28 14:54 ` [PATCH 0/6] [GSoC] Implement Corrected Commit Date Taylor Blau
2020-07-30  7:47   ` Abhishek Kumar
2020-07-28 16:35 ` Derrick Stolee
2020-08-09  2:53 ` [PATCH v2 00/10] " Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 01/10] commit-graph: fix regression when computing bloom filter Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 02/10] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 03/10] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 04/10] commit-graph: consolidate compare_commits_by_gen Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 05/10] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2020-08-10 16:28     ` Derrick Stolee
2020-08-11 11:03       ` Abhishek Kumar
2020-08-11 12:27         ` Derrick Stolee
2020-08-11 18:58           ` Taylor Blau
2020-08-09  2:53   ` [PATCH v2 06/10] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 07/10] commit-graph: implement corrected commit date Abhishek Kumar via GitGitGadget
2020-08-10 14:23     ` Derrick Stolee
2020-08-14  4:59       ` Abhishek Kumar
2020-08-14 12:24         ` Derrick Stolee
2020-08-09  2:53   ` [PATCH v2 08/10] commit-graph: handle mixed generation commit chains Abhishek Kumar via GitGitGadget
2020-08-10 16:42     ` Derrick Stolee
2020-08-11 11:36       ` Abhishek Kumar
2020-08-11 12:43         ` Derrick Stolee
2020-08-09  2:53   ` [PATCH v2 09/10] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2020-08-09  2:53   ` [PATCH v2 10/10] doc: add corrected commit date info Abhishek Kumar via GitGitGadget
2020-08-10 16:47   ` [PATCH v2 00/10] [GSoC] Implement Corrected Commit Date Derrick Stolee
2020-08-15 16:39   ` [PATCH v3 00/11] " Abhishek Kumar via GitGitGadget
2020-08-15 16:39     ` [PATCH v3 01/11] commit-graph: fix regression when computing bloom filter Abhishek Kumar via GitGitGadget
2020-08-17 22:30       ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 02/11] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2020-08-18 14:18       ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 03/11] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2020-08-19 17:54       ` Jakub Narębski
2020-08-21  4:11         ` Abhishek Kumar
2020-08-25 11:11           ` Jakub Narębski
2020-09-01 11:35             ` Abhishek Kumar
2020-08-15 16:39     ` [PATCH v3 04/11] commit-graph: consolidate compare_commits_by_gen Abhishek Kumar via GitGitGadget
2020-08-17 13:22       ` Derrick Stolee
2020-08-21 11:05       ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 05/11] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2020-08-21 13:14       ` Jakub Narębski
2020-08-25  5:04         ` Abhishek Kumar
2020-08-25 12:18           ` Jakub Narębski
2020-09-01 12:06             ` Abhishek Kumar
2020-09-03 13:42               ` Jakub Narębski
2020-09-05 17:21                 ` Abhishek Kumar
2020-09-13 15:39                   ` Jakub Narębski
2020-09-28 21:48                     ` Jakub Narębski
2020-10-05  5:25                       ` Abhishek Kumar
2020-08-15 16:39     ` [PATCH v3 06/11] commit-graph: add a slab to store topological levels Abhishek Kumar via GitGitGadget
2020-08-21 18:43       ` Jakub Narębski
2020-08-25  6:14         ` Abhishek Kumar
2020-08-25  7:33           ` Jakub Narębski
2020-08-25  7:56             ` Jakub Narębski
2020-09-01 10:26               ` Abhishek Kumar
2020-09-03  9:25                 ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 07/11] commit-graph: implement corrected commit date Abhishek Kumar via GitGitGadget
2020-08-22  0:05       ` Jakub Narębski
2020-08-25  6:49         ` Abhishek Kumar
2020-08-25 10:07           ` Jakub Narębski
2020-09-01 11:01             ` Abhishek Kumar
2020-08-15 16:39     ` [PATCH v3 08/11] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2020-08-22 13:09       ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 09/11] commit-graph: use generation v2 only if entire chain does Abhishek Kumar via GitGitGadget
2020-08-22 17:14       ` Jakub Narębski
2020-08-26  7:15         ` Abhishek Kumar
2020-08-26 10:38           ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 10/11] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2020-08-22 19:09       ` Jakub Narębski
2020-09-01 10:08         ` Abhishek Kumar
2020-09-03 19:11           ` Jakub Narębski
2020-08-15 16:39     ` [PATCH v3 11/11] doc: add corrected commit date info Abhishek Kumar via GitGitGadget
2020-08-22 22:20       ` Jakub Narębski
2020-08-27  6:39         ` Abhishek Kumar
2020-08-27 12:43           ` Jakub Narębski
2020-08-27 13:15           ` Derrick Stolee
2020-09-01 13:01             ` Abhishek Kumar
2020-08-17  0:13     ` [PATCH v3 00/11] [GSoC] Implement Corrected Commit Date Jakub Narębski
     [not found]       ` <CANQwDwdKp7oKy9BeKdvKhwPUiq0R5MS8TCw-eWGCYCoMGv=G-g@mail.gmail.com>
2020-08-17  1:32         ` Fwd: " Taylor Blau
2020-08-17  7:56           ` Jakub Narębski
2020-08-18  6:12       ` Abhishek Kumar
2020-08-23 15:27       ` Jakub Narębski
2020-08-24  2:49         ` Abhishek Kumar
2020-10-07 14:09     ` [PATCH v4 00/10] " Abhishek Kumar via GitGitGadget
2020-10-07 14:09       ` [PATCH v4 01/10] commit-graph: fix regression when computing Bloom filters Abhishek Kumar via GitGitGadget
2020-10-24 23:16         ` Jakub Narębski
2020-10-25 20:58           ` Taylor Blau
2020-11-03  5:36             ` Abhishek Kumar
2020-10-07 14:09       ` [PATCH v4 02/10] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2020-10-24 23:41         ` Jakub Narębski
2020-10-07 14:09       ` [PATCH v4 03/10] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2020-10-25 10:52         ` Jakub Narębski
2020-10-27  6:33           ` Abhishek Kumar
2020-10-07 14:09       ` [PATCH v4 04/10] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2020-10-25 13:48         ` Jakub Narębski
2020-11-03  6:40           ` Abhishek Kumar
2020-10-07 14:09       ` [PATCH v4 05/10] commit-graph: add a slab to store topological levels Abhishek Kumar via GitGitGadget
2020-10-25 22:17         ` Jakub Narębski
2020-10-07 14:09       ` [PATCH v4 06/10] commit-graph: implement corrected commit date Abhishek Kumar via GitGitGadget
2020-10-27 18:53         ` Jakub Narębski
2020-11-03 11:44           ` Abhishek Kumar
2020-11-04 16:45             ` Jakub Narębski
2020-11-05 14:05               ` Philip Oakley
2020-11-05 18:22                 ` Junio C Hamano
2020-11-06 18:26                   ` Extending and updating gitglossary (was: Re: [PATCH v4 06/10] commit-graph: implement corrected commit date) Jakub Narębski
2020-11-06 19:33                     ` Extending and updating gitglossary Junio C Hamano
2020-11-08 17:23                     ` Extending and updating gitglossary (was: Re: [PATCH v4 06/10] commit-graph: implement corrected commit date) Philip Oakley
2020-11-10  1:35                       ` Extending and updating gitglossary Jakub Narębski
2020-11-10 14:04                         ` Philip Oakley
2020-11-10 23:52                           ` Jakub Narębski
2020-10-07 14:09       ` [PATCH v4 07/10] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2020-10-30 12:45         ` Jakub Narębski
2020-11-06 11:25           ` Abhishek Kumar
2020-11-06 17:56             ` Jakub Narębski
2020-10-07 14:09       ` [PATCH v4 08/10] commit-graph: use generation v2 only if entire chain does Abhishek Kumar via GitGitGadget
2020-11-01  0:55         ` Jakub Narębski
2020-11-12 10:01           ` Abhishek Kumar
2020-11-13  9:59             ` Jakub Narębski
2020-10-07 14:09       ` [PATCH v4 09/10] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2020-11-03 17:59         ` Jakub Narębski
2020-11-03 18:19           ` Junio C Hamano
2020-11-20 10:33           ` Abhishek Kumar
2020-10-07 14:09       ` [PATCH v4 10/10] doc: add corrected commit date info Abhishek Kumar via GitGitGadget
2020-11-04  1:37         ` Jakub Narębski
2020-11-21  6:30           ` Abhishek Kumar
2020-11-04 23:37       ` [PATCH v4 00/10] [GSoC] Implement Corrected Commit Date Jakub Narębski
2020-11-22  5:31         ` Abhishek Kumar
2020-12-28 11:15       ` [PATCH v5 00/11] " Abhishek Kumar via GitGitGadget
2020-12-28 11:15         ` [PATCH v5 01/11] commit-graph: fix regression when computing Bloom filters Abhishek Kumar via GitGitGadget
2020-12-30  1:35           ` Derrick Stolee
2021-01-08  5:45             ` Abhishek Kumar
2021-01-05  9:45           ` SZEDER Gábor
2021-01-05  9:47             ` SZEDER Gábor
2021-01-08  5:51             ` Abhishek Kumar
2020-12-28 11:15         ` [PATCH v5 02/11] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 03/11] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 04/11] t6600-test-reach: generalize *_three_modes Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 05/11] commit-graph: add a slab to store topological levels Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 06/11] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` Abhishek Kumar via GitGitGadget [this message]
2020-12-30  1:53           ` [PATCH v5 07/11] commit-graph: implement corrected commit date Derrick Stolee
2021-01-10 12:21             ` Abhishek Kumar
2020-12-28 11:16         ` [PATCH v5 08/11] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 09/11] commit-graph: use generation v2 only if entire chain does Abhishek Kumar via GitGitGadget
2020-12-30  3:23           ` Derrick Stolee
2021-01-10 13:13             ` Abhishek Kumar
2021-01-11 12:43               ` Derrick Stolee
2020-12-28 11:16         ` [PATCH v5 10/11] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2020-12-28 11:16         ` [PATCH v5 11/11] doc: add corrected commit date info Abhishek Kumar via GitGitGadget
2020-12-30  4:35         ` [PATCH v5 00/11] [GSoC] Implement Corrected Commit Date Derrick Stolee
2021-01-10 14:06           ` Abhishek Kumar
2021-01-16 18:11         ` [PATCH v6 " Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 01/11] commit-graph: fix regression when computing Bloom filters Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 02/11] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 03/11] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 04/11] t6600-test-reach: generalize *_three_modes Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 05/11] commit-graph: add a slab to store topological levels Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 06/11] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 07/11] commit-graph: implement corrected commit date Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 08/11] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 09/11] commit-graph: use generation v2 only if entire chain does Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 10/11] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2021-01-16 18:11           ` [PATCH v6 11/11] doc: add corrected commit date info Abhishek Kumar via GitGitGadget
2021-01-27  0:04             ` SZEDER Gábor
2021-01-30  5:29               ` Abhishek Kumar
2021-01-31  1:45                 ` Taylor Blau
2021-01-18 21:04           ` [PATCH v6 00/11] [GSoC] Implement Corrected Commit Date Derrick Stolee
2021-01-18 22:00             ` Taylor Blau
2021-01-23 12:11               ` Abhishek Kumar
2021-01-19  0:02             ` Junio C Hamano
2021-01-23 12:07             ` Abhishek Kumar
2021-02-01  6:58           ` [PATCH v7 " Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 01/11] commit-graph: fix regression when computing Bloom filters Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 02/11] revision: parse parent in indegree_walk_step() Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 03/11] commit-graph: consolidate fill_commit_graph_info Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 04/11] t6600-test-reach: generalize *_three_modes Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 05/11] commit-graph: add a slab to store topological levels Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 06/11] commit-graph: return 64-bit generation number Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 07/11] commit-graph: document generation number v2 Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 08/11] commit-graph: implement corrected commit date Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 09/11] commit-graph: implement generation data chunk Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 10/11] commit-graph: use generation v2 only if entire chain does Abhishek Kumar via GitGitGadget
2021-02-01  6:58             ` [PATCH v7 11/11] commit-reach: use corrected commit dates in paint_down_to_common() Abhishek Kumar via GitGitGadget
2021-02-01 13:14             ` [PATCH v7 00/11] [GSoC] Implement Corrected Commit Date Derrick Stolee
2021-02-01 18:26               ` Junio C Hamano

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