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From: Taylor Blau <me@ttaylorr.com>
To: git@vger.kernel.org
Cc: dstolee@microsoft.com, gitster@pobox.com, peff@peff.net,
	szeder.dev@gmail.com
Subject: [PATCH v2 07/13] bloom: split 'get_bloom_filter()' in two
Date: Wed, 16 Sep 2020 14:07:32 -0400	[thread overview]
Message-ID: <ee8f527a0078161f0466a75e85eef611249a0a46.1600279373.git.me@ttaylorr.com> (raw)
In-Reply-To: <cover.1600279373.git.me@ttaylorr.com>

'get_bloom_filter' takes a flag to control whether it will compute a
Bloom filter if the requested one is missing. In the next patch, we'll
add yet another parameter to this method, which would force all but one
caller to specify an extra 'NULL' parameter at the end.

Instead of doing this, split 'get_bloom_filter' into two functions:
'get_bloom_filter' and 'get_or_compute_bloom_filter'. The former only
looks up a Bloom filter (and does not compute one if it's missing,
thus dropping the 'compute_if_not_present' flag). The latter does
compute missing Bloom filters, with an additional parameter to store
whether or not it needed to do so.

This simplifies many call-sites, since the majority of existing callers
to 'get_bloom_filter' do not want missing Bloom filters to be computed
(so they can drop the parameter entirely and use the simpler version of
the function).

While we're at it, instrument the new 'get_or_compute_bloom_filter()'
with counters in the 'write_commit_graph_context' struct which store
the number of filters that we did and didn't compute, as well as filters
that were truncated.

It would be nice to drop the 'compute_if_not_present' flag entirely,
since all remaining callers of 'get_or_compute_bloom_filter' pass it as
'1', but this will change in a future patch and hence cannot be removed.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 blame.c               |  2 +-
 bloom.c               | 16 +++++++++++++---
 bloom.h               | 16 +++++++++++++---
 commit-graph.c        | 34 +++++++++++++++++++++++++++++++---
 line-log.c            |  2 +-
 revision.c            |  2 +-
 t/helper/test-bloom.c |  3 ++-
 7 files changed, 62 insertions(+), 13 deletions(-)

diff --git a/blame.c b/blame.c
index 903e23af23..e5ba35dbd1 100644
--- a/blame.c
+++ b/blame.c
@@ -1276,7 +1276,7 @@ static int maybe_changed_path(struct repository *r,
 	if (commit_graph_generation(origin->commit) == GENERATION_NUMBER_INFINITY)
 		return 1;
 
-	filter = get_bloom_filter(r, origin->commit, 0);
+	filter = get_bloom_filter(r, origin->commit);
 
 	if (!filter)
 		return 1;
diff --git a/bloom.c b/bloom.c
index cd9380ac62..393c61b4bc 100644
--- a/bloom.c
+++ b/bloom.c
@@ -177,9 +177,10 @@ static int pathmap_cmp(const void *hashmap_cmp_fn_data,
 	return strcmp(e1->path, e2->path);
 }
 
-struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c,
-				      int compute_if_not_present)
+struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
+						 struct commit *c,
+						 int compute_if_not_present,
+						 enum bloom_filter_computed *computed)
 {
 	struct bloom_filter *filter;
 	struct bloom_filter_settings settings = DEFAULT_BLOOM_FILTER_SETTINGS;
@@ -187,6 +188,9 @@ struct bloom_filter *get_bloom_filter(struct repository *r,
 	struct diff_options diffopt;
 	int max_changes = 512;
 
+	if (computed)
+		*computed = BLOOM_NOT_COMPUTED;
+
 	if (!bloom_filters.slab_size)
 		return NULL;
 
@@ -271,8 +275,14 @@ struct bloom_filter *get_bloom_filter(struct repository *r,
 			diff_free_filepair(diff_queued_diff.queue[i]);
 		filter->data = NULL;
 		filter->len = 0;
+
+		if (computed)
+			*computed |= BLOOM_TRUNC_LARGE;
 	}
 
+	if (computed)
+		*computed |= BLOOM_COMPUTED;
+
 	free(diff_queued_diff.queue);
 	DIFF_QUEUE_CLEAR(&diff_queued_diff);
 
diff --git a/bloom.h b/bloom.h
index 0b9b59a6fe..e2e035ad14 100644
--- a/bloom.h
+++ b/bloom.h
@@ -89,9 +89,19 @@ void add_key_to_filter(const struct bloom_key *key,
 
 void init_bloom_filters(void);
 
-struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c,
-				      int compute_if_not_present);
+enum bloom_filter_computed {
+	BLOOM_NOT_COMPUTED = (1 << 0),
+	BLOOM_COMPUTED     = (1 << 1),
+	BLOOM_TRUNC_LARGE  = (1 << 2),
+};
+
+struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
+						 struct commit *c,
+						 int compute_if_not_present,
+						 enum bloom_filter_computed *computed);
+
+#define get_bloom_filter(r, c) get_or_compute_bloom_filter( \
+	(r), (c), 0, NULL)
 
 int bloom_filter_contains(const struct bloom_filter *filter,
 			  const struct bloom_key *key,
diff --git a/commit-graph.c b/commit-graph.c
index 55af498aa0..45fcd62596 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -971,6 +971,10 @@ struct write_commit_graph_context {
 	const struct split_commit_graph_opts *split_opts;
 	size_t total_bloom_filter_data_size;
 	const struct bloom_filter_settings *bloom_settings;
+
+	int count_bloom_filter_computed;
+	int count_bloom_filter_not_computed;
+	int count_bloom_filter_trunc_large;
 };
 
 static int write_graph_chunk_fanout(struct hashfile *f,
@@ -1182,7 +1186,7 @@ static int write_graph_chunk_bloom_indexes(struct hashfile *f,
 	uint32_t cur_pos = 0;
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
 		size_t len = filter ? filter->len : 0;
 		cur_pos += len;
 		display_progress(ctx->progress, ++ctx->progress_cnt);
@@ -1222,7 +1226,7 @@ static int write_graph_chunk_bloom_data(struct hashfile *f,
 	hashwrite_be32(f, ctx->bloom_settings->bits_per_entry);
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
 		size_t len = filter ? filter->len : 0;
 
 		display_progress(ctx->progress, ++ctx->progress_cnt);
@@ -1392,6 +1396,16 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 	stop_progress(&ctx->progress);
 }
 
+static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
+{
+	trace2_data_intmax("commit-graph", ctx->r, "filter-computed",
+			   ctx->count_bloom_filter_computed);
+	trace2_data_intmax("commit-graph", ctx->r, "filter-not-computed",
+			   ctx->count_bloom_filter_not_computed);
+	trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large",
+			   ctx->count_bloom_filter_trunc_large);
+}
+
 static void compute_bloom_filters(struct write_commit_graph_context *ctx)
 {
 	int i;
@@ -1414,12 +1428,26 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
 		QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
 
 	for (i = 0; i < ctx->commits.nr; i++) {
+		enum bloom_filter_computed computed = 0;
 		struct commit *c = sorted_commits[i];
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, c, 1);
+		struct bloom_filter *filter = get_or_compute_bloom_filter(
+			ctx->r,
+			c,
+			1,
+			&computed);
+		if (computed & BLOOM_COMPUTED) {
+			ctx->count_bloom_filter_computed++;
+			if (computed & BLOOM_TRUNC_LARGE)
+				ctx->count_bloom_filter_trunc_large++;
+		} else if (computed & BLOOM_NOT_COMPUTED)
+			ctx->count_bloom_filter_not_computed++;
 		ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
 		display_progress(progress, i + 1);
 	}
 
+	if (trace2_is_enabled())
+		trace2_bloom_filter_write_statistics(ctx);
+
 	free(sorted_commits);
 	stop_progress(&progress);
 }
diff --git a/line-log.c b/line-log.c
index bf73ea95ac..68eeb425f8 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1159,7 +1159,7 @@ static int bloom_filter_check(struct rev_info *rev,
 		return 1;
 
 	if (!rev->bloom_filter_settings ||
-	    !(filter = get_bloom_filter(rev->repo, commit, 0)))
+	    !(filter = get_bloom_filter(rev->repo, commit)))
 		return 1;
 
 	if (!range)
diff --git a/revision.c b/revision.c
index 6aeb764821..c53ab99e59 100644
--- a/revision.c
+++ b/revision.c
@@ -752,7 +752,7 @@ static int check_maybe_different_in_bloom_filter(struct rev_info *revs,
 	if (commit_graph_generation(commit) == GENERATION_NUMBER_INFINITY)
 		return -1;
 
-	filter = get_bloom_filter(revs->repo, commit, 0);
+	filter = get_bloom_filter(revs->repo, commit);
 
 	if (!filter) {
 		count_bloom_filter_not_present++;
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 5e77d56f59..9f7bb729fc 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -39,7 +39,8 @@ 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, 1);
+	filter = get_or_compute_bloom_filter(the_repository, c, 1,
+					     NULL);
 	print_bloom_filter(filter);
 }
 
-- 
2.28.0.510.g86fdc5f89a


  parent reply	other threads:[~2020-09-16 18:09 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 15:22 [PATCH 00/12] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-09 15:22 ` [PATCH 01/12] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-09 15:22 ` [PATCH 02/12] t4216: use an '&&'-chain Taylor Blau
2020-09-09 15:22 ` [PATCH 03/12] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-09 15:23 ` [PATCH 04/12] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-09 15:23 ` [PATCH 05/12] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-09 15:23 ` [PATCH 06/12] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-09 15:23 ` [PATCH 07/12] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-09 15:23 ` [PATCH 08/12] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-09 15:23 ` [PATCH 09/12] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-09 15:23 ` [PATCH 10/12] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-10  3:35   ` Taylor Blau
2020-09-10 15:45     ` Taylor Blau
2020-09-11 18:15       ` Derrick Stolee
2020-09-09 15:23 ` [PATCH 11/12] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-09 15:24 ` [PATCH 12/12] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-11 17:52   ` Jeff King
2020-09-11 18:59     ` Taylor Blau
2020-09-11 19:25       ` Taylor Blau
2020-09-14 20:12         ` Taylor Blau
2020-09-14 20:31           ` Derrick Stolee
2020-09-14 20:36             ` Taylor Blau
2020-09-15  0:59               ` Derrick Stolee
2020-09-15  4:31                 ` Taylor Blau
2020-09-15 21:49               ` Junio C Hamano
2020-09-15 21:53                 ` Taylor Blau
2020-09-11 19:47       ` Jeff King
2020-09-11 19:31     ` Junio C Hamano
2020-09-16 18:06 ` [PATCH v2 00/13] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-16 18:06   ` [PATCH v2 01/13] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-16 18:07   ` [PATCH v2 02/13] t4216: use an '&&'-chain Taylor Blau
2020-09-16 18:07   ` [PATCH v2 03/13] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-16 18:07   ` [PATCH v2 04/13] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-16 18:07   ` [PATCH v2 05/13] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-16 18:07   ` [PATCH v2 06/13] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-16 18:07   ` Taylor Blau [this message]
2020-09-16 18:07   ` [PATCH v2 08/13] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-16 18:07   ` [PATCH v2 09/13] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-16 18:07   ` [PATCH v2 10/13] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-17 22:13     ` SZEDER Gábor
2020-09-17 23:13       ` Taylor Blau
2020-09-18  0:52         ` Junio C Hamano
2020-09-18  1:15           ` Taylor Blau
2020-09-16 18:08   ` [PATCH v2 11/13] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-16 18:08   ` [PATCH v2 12/13] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-18  9:23     ` SZEDER Gábor
2020-09-18 13:27       ` Taylor Blau
2020-09-16 18:08   ` [PATCH v2 13/13] commit-graph: introduce 'commitGraph.maxNewFilters' Taylor Blau
2020-09-16 22:51   ` [PATCH v2 00/13] more miscellaneous Bloom filter improvements, redux Derrick Stolee
2020-09-16 23:07     ` Junio C Hamano
2020-09-17  0:45       ` Taylor Blau
2020-09-17  0:59         ` Junio C Hamano
2020-09-17  1:10           ` Taylor Blau
2020-09-17 13:34             ` Taylor Blau
2020-09-17 13:38               ` Derrick Stolee
2020-09-18  2:58 ` [PATCH v3 " Taylor Blau
2020-09-18  2:58   ` [PATCH v3 01/13] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-18  2:58   ` [PATCH v3 02/13] t4216: use an '&&'-chain Taylor Blau
2020-09-18  2:59   ` [PATCH v3 03/13] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-18  2:59   ` [PATCH v3 04/13] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-18  2:59   ` [PATCH v3 05/13] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 06/13] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-18  2:59   ` [PATCH v3 07/13] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-18  2:59   ` [PATCH v3 08/13] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-18 16:27     ` SZEDER Gábor
2020-09-18 16:32       ` Taylor Blau
2020-09-18  2:59   ` [PATCH v3 09/13] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-18  2:59   ` [PATCH v3 10/13] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-18  2:59   ` [PATCH v3 11/13] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 12/13] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 13/13] commit-graph: introduce 'commitGraph.maxNewFilters' Taylor Blau
2020-09-18 13:29     ` Taylor Blau
2020-09-18 17:43       ` Junio C Hamano
2020-09-18 13:31   ` [PATCH v3 00/13] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-18 13:34     ` Taylor Blau

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