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From: "Garima Singh via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: stolee@gmail.com, szeder.dev@gmail.com, jonathantanmy@google.com,
	jeffhost@microsoft.com, me@ttaylorr.com, peff@peff.net,
	garimasigit@gmail.com, jnareb@gmail.com,
	christian.couder@gmail.com, emilyshaffer@gmail.com,
	gitster@pobox.com, Garima Singh <garima.singh@microsoft.com>,
	Garima Singh <garima.singh@microsoft.com>
Subject: [PATCH v2 08/11] commit-graph: reuse existing Bloom filters during write.
Date: Wed, 05 Feb 2020 22:56:27 +0000	[thread overview]
Message-ID: <b20c8d2b2096bf10fe1a5f37a5181c57873a9676.1580943390.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.497.v2.git.1580943390.gitgitgadget@gmail.com>

From: Garima Singh <garima.singh@microsoft.com>

Read previously computed Bloom filters from the commit-graph file if
possible to avoid recomputing during commit-graph write.

See Documentation/technical/commit-graph-format for the format in which
the Bloom filter information is written to the commit graph file.

To read Bloom filter for a given commit with lexicographic position
'i' we need to:
1. Read BIDX[i] which essentially gives us the starting index in BDAT for
   filter of commit i+1. It is essentially the index past the end
   of the filter of commit i. It is called end_index in the code.

2. For i>0, read BIDX[i-1] which will give us the starting index in BDAT
   for filter of commit i. It is called the start_index in the code.
   For the first commit, where i = 0, Bloom filter data starts at the
   beginning, just past the header in the BDAT chunk. Hence, start_index
   will be 0.

3. The length of the filter will be end_index - start_index, because
   BIDX[i] gives the cumulative 8-byte words including the ith
   commit's filter.

We toggle whether Bloom filters should be recomputed based on the
compute_if_null flag.

Helped-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Garima Singh <garima.singh@microsoft.com>
---
 bloom.c               | 49 ++++++++++++++++++++++++++++++++++++++++++-
 bloom.h               |  4 +++-
 commit-graph.c        |  7 ++++---
 t/helper/test-bloom.c |  2 +-
 4 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/bloom.c b/bloom.c
index 818382c03b..90d84dc713 100644
--- a/bloom.c
+++ b/bloom.c
@@ -1,5 +1,7 @@
 #include "git-compat-util.h"
 #include "bloom.h"
+#include "commit.h"
+#include "commit-slab.h"
 #include "commit-graph.h"
 #include "object-store.h"
 #include "diff.h"
@@ -127,8 +129,39 @@ void add_key_to_filter(struct bloom_key *key,
 	}
 }
 
+static int load_bloom_filter_from_graph(struct commit_graph *g,
+				   struct bloom_filter *filter,
+				   struct commit *c)
+{
+	uint32_t lex_pos, start_index, end_index;
+
+	while (c->graph_pos < g->num_commits_in_base)
+		g = g->base_graph;
+
+	/* The commit graph commit 'c' lives in doesn't carry bloom filters. */
+	if (!g->chunk_bloom_indexes)
+		return 0;
+
+	lex_pos = c->graph_pos - g->num_commits_in_base;
+
+	end_index = get_be32(g->chunk_bloom_indexes + 4 * lex_pos);
+
+	if (lex_pos)
+		start_index = get_be32(g->chunk_bloom_indexes + 4 * (lex_pos - 1));
+	else
+		start_index = 0;
+
+	filter->len = end_index - start_index;
+	filter->data = (uint64_t *)(g->chunk_bloom_data +
+					sizeof(uint64_t) * start_index +
+					BLOOMDATA_CHUNK_HEADER_SIZE);
+
+	return 1;
+}
+
 struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c)
+				      struct commit *c,
+				      int compute_if_not_present)
 {
 	struct bloom_filter *filter;
 	struct bloom_filter_settings settings = DEFAULT_BLOOM_FILTER_SETTINGS;
@@ -141,6 +174,20 @@ struct bloom_filter *get_bloom_filter(struct repository *r,
 
 	filter = bloom_filter_slab_at(&bloom_filters, c);
 
+	if (!filter->data) {
+		load_commit_graph_info(r, c);
+		if (c->graph_pos != COMMIT_NOT_FROM_GRAPH &&
+			r->objects->commit_graph->chunk_bloom_indexes) {
+			if (load_bloom_filter_from_graph(r->objects->commit_graph, filter, c))
+				return filter;
+			else
+				return NULL;
+		}
+	}
+
+	if (filter->data || !compute_if_not_present)
+		return filter;
+
 	repo_diff_setup(r, &diffopt);
 	diffopt.flags.recursive = 1;
 	diffopt.max_changes = max_changes;
diff --git a/bloom.h b/bloom.h
index 7f40c751f7..76f8a9ad0c 100644
--- a/bloom.h
+++ b/bloom.h
@@ -13,6 +13,7 @@ struct bloom_filter_settings {
 
 #define DEFAULT_BLOOM_FILTER_SETTINGS { 1, 7, 10 }
 #define BITS_PER_WORD 64
+#define BLOOMDATA_CHUNK_HEADER_SIZE 3*sizeof(uint32_t)
 
 /*
  * A bloom_filter struct represents a data segment to
@@ -47,7 +48,8 @@ void add_key_to_filter(struct bloom_key *key,
 					   struct bloom_filter_settings *settings);
 
 struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c);
+				      struct commit *c,
+				      int compute_if_not_present);
 
 int bloom_filter_contains(struct bloom_filter *filter,
 			  struct bloom_key *key,
diff --git a/commit-graph.c b/commit-graph.c
index 4585b3b702..c0e9834bf2 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1094,7 +1094,7 @@ static void write_graph_chunk_bloom_indexes(struct hashfile *f,
 			ctx->commits.nr);
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
 		cur_pos += filter->len;
 		display_progress(progress, ++i);
 		hashwrite_be32(f, cur_pos);
@@ -1123,7 +1123,7 @@ static void write_graph_chunk_bloom_data(struct hashfile *f,
 	hashwrite_be32(f, settings->bits_per_entry);
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
 		display_progress(progress, ++i);
 		hashwrite(f, filter->data, filter->len * sizeof(uint64_t));
 		list++;
@@ -1304,7 +1304,7 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
 
 	for (i = 0; i < ctx->commits.nr; i++) {
 		struct commit *c = sorted_by_pos[i];
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, c);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, c, 1);
 		ctx->total_bloom_filter_data_size += sizeof(uint64_t) * filter->len;
 		display_progress(progress, i + 1);
 	}
@@ -2314,6 +2314,7 @@ void free_commit_graph(struct commit_graph *g)
 		g->data = NULL;
 		close(g->graph_fd);
 	}
+	free(g->bloom_filter_settings);
 	free(g->filename);
 	free(g);
 }
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 331957011b..9b4be97f75 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -47,7 +47,7 @@ static void get_bloom_filter_for_commit(const struct object_id *commit_oid)
 	struct bloom_filter *filter;
 	setup_git_directory();
 	c = lookup_commit(the_repository, commit_oid);
-	filter = get_bloom_filter(the_repository, c);
+	filter = get_bloom_filter(the_repository, c, 1);
 	print_bloom_filter(filter);
 }
 
-- 
gitgitgadget


  parent reply	other threads:[~2020-02-05 22:56 UTC|newest]

Thread overview: 159+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-20 22:05 [PATCH 0/9] [RFC] Changed Paths Bloom Filters Garima Singh via GitGitGadget
2019-12-20 22:05 ` [PATCH 1/9] commit-graph: add --changed-paths option to write Garima Singh via GitGitGadget
2020-01-01 20:20   ` Jakub Narebski
2019-12-20 22:05 ` [PATCH 2/9] commit-graph: write changed paths bloom filters Garima Singh via GitGitGadget
2019-12-21 16:48   ` Philip Oakley
2020-01-06 18:44   ` Jakub Narebski
2020-01-13 19:48     ` Garima Singh
2019-12-20 22:05 ` [PATCH 3/9] commit-graph: use MAX_NUM_CHUNKS Garima Singh via GitGitGadget
2020-01-07 12:19   ` Jakub Narebski
2019-12-20 22:05 ` [PATCH 4/9] commit-graph: document bloom filter format Garima Singh via GitGitGadget
2020-01-07 14:46   ` Jakub Narebski
2019-12-20 22:05 ` [PATCH 5/9] commit-graph: write changed path bloom filters to commit-graph file Garima Singh via GitGitGadget
2020-01-07 16:01   ` Jakub Narebski
2020-01-14 15:14     ` Garima Singh
2019-12-20 22:05 ` [PATCH 6/9] commit-graph: test commit-graph write --changed-paths Garima Singh via GitGitGadget
2020-01-08  0:32   ` Jakub Narebski
2019-12-20 22:05 ` [PATCH 7/9] commit-graph: reuse existing bloom filters during write Garima Singh via GitGitGadget
2020-01-09 19:12   ` Jakub Narebski
2019-12-20 22:05 ` [PATCH 8/9] revision.c: use bloom filters to speed up path based revision walks Garima Singh via GitGitGadget
2020-01-11  0:27   ` Jakub Narebski
2020-01-15  0:08     ` Garima Singh
2019-12-20 22:05 ` [PATCH 9/9] commit-graph: add GIT_TEST_COMMIT_GRAPH_BLOOM_FILTERS test flag Garima Singh via GitGitGadget
2020-01-11 19:56   ` Jakub Narebski
2020-01-15  0:55     ` Garima Singh
2019-12-20 22:14 ` [PATCH 0/9] [RFC] Changed Paths Bloom Filters Junio C Hamano
2019-12-22  9:26 ` Christian Couder
2019-12-22  9:38   ` Jeff King
2020-01-01 12:04     ` Jakub Narebski
2019-12-22  9:30 ` Jeff King
2019-12-22  9:32   ` [PATCH 1/3] commit-graph: examine changed-path objects in pack order Jeff King
2019-12-27 14:51     ` Derrick Stolee
2019-12-29  6:12       ` Jeff King
2019-12-29  6:28         ` Jeff King
2019-12-30 14:37         ` Derrick Stolee
2019-12-30 14:51           ` Derrick Stolee
2019-12-22  9:32   ` [PATCH 2/3] commit-graph: free large diffs, too Jeff King
2019-12-27 14:52     ` Derrick Stolee
2019-12-22  9:32   ` [PATCH 3/3] commit-graph: stop using full rev_info for diffs Jeff King
2019-12-27 14:53     ` Derrick Stolee
2019-12-26 14:21   ` [PATCH 0/9] [RFC] Changed Paths Bloom Filters Derrick Stolee
2019-12-29  6:03     ` Jeff King
2019-12-27 16:11   ` Derrick Stolee
2019-12-29  6:24     ` Jeff King
2019-12-30 16:04       ` Derrick Stolee
2019-12-30 17:02       ` Junio C Hamano
2019-12-31 16:45 ` Jakub Narebski
2020-01-13 16:54   ` Garima Singh
2020-01-20 13:48     ` Jakub Narebski
2020-01-21 16:14       ` Garima Singh
2020-02-02 18:43         ` Jakub Narebski
2020-01-21 23:40 ` Emily Shaffer
2020-01-27 18:24   ` Garima Singh
2020-02-01 23:32   ` Jakub Narebski
2020-02-05 22:56 ` [PATCH v2 00/11] " Garima Singh via GitGitGadget
2020-02-05 22:56   ` [PATCH v2 01/11] commit-graph: use MAX_NUM_CHUNKS Garima Singh via GitGitGadget
2020-02-09 12:39     ` Jakub Narebski
2020-02-05 22:56   ` [PATCH v2 02/11] bloom: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget
2020-02-15 17:17     ` Jakub Narebski
2020-02-16 16:49     ` Jakub Narebski
2020-02-22  0:32       ` Garima Singh
2020-02-23 13:38         ` Jakub Narebski
2020-02-24 17:34           ` Garima Singh
2020-02-24 18:20             ` Jakub Narebski
2020-02-05 22:56   ` [PATCH v2 03/11] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget
2020-02-17  0:00     ` Jakub Narebski
2020-02-22  0:37       ` Garima Singh
2020-02-05 22:56   ` [PATCH v2 04/11] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget
2020-02-17 21:56     ` Jakub Narebski
2020-02-22  0:55       ` Garima Singh
2020-02-23 17:34         ` Jakub Narebski
2020-02-05 22:56   ` [PATCH v2 05/11] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget
2020-02-18 17:59     ` Jakub Narebski
2020-02-24 18:29       ` Garima Singh
2020-02-05 22:56   ` [PATCH v2 06/11] commit-graph: examine commits by generation number Derrick Stolee via GitGitGadget
2020-02-19  0:32     ` Jakub Narebski
2020-02-24 20:45       ` Garima Singh
2020-02-05 22:56   ` [PATCH v2 07/11] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget
2020-02-19 15:13     ` Jakub Narebski
2020-02-24 21:14       ` Garima Singh
2020-02-25 11:40         ` Jakub Narebski
2020-02-25 15:58           ` Garima Singh
2020-02-05 22:56   ` Garima Singh via GitGitGadget [this message]
2020-02-20 18:48     ` [PATCH v2 08/11] commit-graph: reuse existing Bloom filters during write Jakub Narebski
2020-02-24 21:45       ` Garima Singh
2020-02-05 22:56   ` [PATCH v2 09/11] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget
2020-02-20 20:28     ` Jakub Narebski
2020-02-24 21:51       ` Garima Singh
2020-02-25 12:10         ` Jakub Narebski
2020-02-20 22:10     ` Bryan Turner
2020-02-22  1:44       ` Garima Singh
2020-02-05 22:56   ` [PATCH v2 10/11] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget
2020-02-21 17:31     ` Jakub Narebski
2020-02-21 22:45     ` Jakub Narebski
2020-02-05 22:56   ` [PATCH v2 11/11] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget
2020-02-22  0:11     ` Jakub Narebski
2020-02-07 13:52   ` [PATCH v2 00/11] Changed Paths Bloom Filters SZEDER Gábor
2020-02-07 15:09     ` Garima Singh
2020-02-07 15:36       ` Derrick Stolee
2020-02-07 16:15         ` SZEDER Gábor
2020-02-07 16:33           ` Derrick Stolee
2020-02-11 19:08       ` Garima Singh
2020-02-08 23:04   ` Jakub Narebski
2020-02-21 17:41     ` Garima Singh
2020-03-29 18:36       ` Junio C Hamano
2020-03-30  0:31   ` [PATCH v3 00/16] " Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 01/16] commit-graph: define and use MAX_NUM_CHUNKS Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 02/16] bloom.c: add the murmur3 hash implementation Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 03/16] bloom.c: introduce core Bloom filter constructs Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 04/16] bloom.c: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 05/16] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 06/16] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 07/16] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 08/16] commit-graph: examine commits by generation number Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 09/16] diff: skip batch object download when possible Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 10/16] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 11/16] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 12/16] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 13/16] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 14/16] revision.c: add trace2 stats around Bloom filter usage Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 15/16] t4216: add end to end tests for git log with Bloom filters Garima Singh via GitGitGadget
2020-03-30  0:31     ` [PATCH v3 16/16] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget
2020-04-06 16:59     ` [PATCH v4 00/15] Changed Paths Bloom Filters Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 01/15] commit-graph: define and use MAX_NUM_CHUNKS Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 02/15] bloom.c: add the murmur3 hash implementation Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 03/15] bloom.c: introduce core Bloom filter constructs Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 04/15] bloom.c: core Bloom filter implementation for changed paths Garima Singh via GitGitGadget
2020-06-27 15:53         ` SZEDER Gábor
2020-04-06 16:59       ` [PATCH v4 05/15] diff: halt tree-diff early after max_changes Derrick Stolee via GitGitGadget
2020-08-04 14:47         ` SZEDER Gábor
2020-08-04 16:25           ` Derrick Stolee
2020-08-04 17:00             ` SZEDER Gábor
2020-08-04 17:31               ` Derrick Stolee
2020-08-05 17:08                 ` Derrick Stolee
2020-04-06 16:59       ` [PATCH v4 06/15] commit-graph: compute Bloom filters for changed paths Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 07/15] commit-graph: examine changed-path objects in pack order Jeff King via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 08/15] commit-graph: examine commits by generation number Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 09/15] commit-graph: write Bloom filters to commit graph file Garima Singh via GitGitGadget
2020-05-29  8:57         ` SZEDER Gábor
2020-05-29 13:35           ` Derrick Stolee
2020-05-31 17:23             ` SZEDER Gábor
2020-07-09 17:00         ` [PATCH] commit-graph: fix "Writing out commit graph" progress counter SZEDER Gábor
2020-07-09 18:01           ` Derrick Stolee
2020-07-09 18:20             ` Derrick Stolee
2020-04-06 16:59       ` [PATCH v4 10/15] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget
2020-06-19 14:02         ` SZEDER Gábor
2020-06-19 19:28           ` Junio C Hamano
2020-07-27 21:33         ` SZEDER Gábor
2020-04-06 16:59       ` [PATCH v4 11/15] commit-graph: add --changed-paths option to write subcommand Garima Singh via GitGitGadget
2020-06-07 22:21         ` SZEDER Gábor
2020-04-06 16:59       ` [PATCH v4 12/15] revision.c: use Bloom filters to speed up path based revision walks Garima Singh via GitGitGadget
2020-06-26  6:34         ` SZEDER Gábor
2020-04-06 16:59       ` [PATCH v4 13/15] revision.c: add trace2 stats around Bloom filter usage Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 14/15] t4216: add end to end tests for git log with Bloom filters Garima Singh via GitGitGadget
2020-04-06 16:59       ` [PATCH v4 15/15] commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag Garima Singh via GitGitGadget
2020-04-08 15:51       ` [PATCH v4 00/15] Changed Paths Bloom Filters Derrick Stolee
2020-04-08 19:21         ` Junio C Hamano
2020-04-08 20:05         ` Jakub Narębski
2020-04-12 20:34         ` Taylor Blau
2020-03-05 19:49 ` [PATCH 0/9] [RFC] " Garima Singh

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