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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Taylor Blau <me@ttaylorr.com>
Cc: git@vger.kernel.org, peff@peff.net, dstolee@microsoft.com,
	gitster@pobox.com
Subject: Re: [PATCH v3 14/14] builtin/commit-graph.c: introduce '--max-new-filters=<n>'
Date: Wed, 19 Aug 2020 00:23:29 +0200	[thread overview]
Message-ID: <20200818222329.GC29528@szeder.dev> (raw)
In-Reply-To: <09f6871f66bff838c067a3e0d23cd4622171f3bd.1597178915.git.me@ttaylorr.com>

On Tue, Aug 11, 2020 at 04:52:14PM -0400, Taylor Blau wrote:
> Introduce a command-line flag and configuration variable to fill in the
> 'max_new_filters' variable introduced by the previous patch.

'max_new_filters' is introduced in this patch.

> The command-line option '--max-new-filters' takes precedence over
> 'commitGraph.maxNewFilters', which is the default value.

What "filters"?  While misnamed, the '--changed-paths' options did a
good job at hiding the implementation detail that we use Bloom filters
to speed up pathspec-limited revision walks; as far as I remember this
was a conscious design decision.  Including "filter" in the name of
the option and corresponding config variable goes against this
decision.  Furthermore, by not being specific we might end up in abad
situation when adding some other filters to the commit-graph format.
Unfortunately, I can't offhand propose a better option name, all my
ideas were horrible.

> '--no-max-new-filters' can also be provided, which sets the value back
> to '-1', indicating that an unlimited number of new Bloom filters may be
> generated. (OPT_INTEGER only allows setting the '--no-' variant back to
> '0', hence a custom callback was used instead).
> 
> Signed-off-by: Taylor Blau <me@ttaylorr.com>
> ---
>  Documentation/config/commitgraph.txt |  4 +++
>  Documentation/git-commit-graph.txt   |  4 +++
>  bloom.c                              | 15 +++++++++++
>  builtin/commit-graph.c               | 39 +++++++++++++++++++++++++---
>  commit-graph.c                       | 27 ++++++++++++++++---
>  commit-graph.h                       |  1 +
>  t/t4216-log-bloom.sh                 | 19 ++++++++++++++
>  7 files changed, 102 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/config/commitgraph.txt b/Documentation/config/commitgraph.txt
> index cff0797b54..4582c39fc4 100644
> --- a/Documentation/config/commitgraph.txt
> +++ b/Documentation/config/commitgraph.txt
> @@ -1,3 +1,7 @@
> +commitGraph.maxNewFilters::
> +	Specifies the default value for the `--max-new-filters` option of `git
> +	commit-graph write` (c.f., linkgit:git-commit-graph[1]).
> +
>  commitGraph.readChangedPaths::
>  	If true, then git will use the changed-path Bloom filters in the
>  	commit-graph file (if it exists, and they are present). Defaults to
> diff --git a/Documentation/git-commit-graph.txt b/Documentation/git-commit-graph.txt
> index 17405c73a9..9c887d5d79 100644
> --- a/Documentation/git-commit-graph.txt
> +++ b/Documentation/git-commit-graph.txt
> @@ -67,6 +67,10 @@ this option is given, future commit-graph writes will automatically assume
>  that this option was intended. Use `--no-changed-paths` to stop storing this
>  data.
>  +
> +With the `--max-new-filters=<n>` option, generate at most `n` new Bloom
> +filters (if `--changed-paths` is specified). If `n` is `-1`, no limit is
> +enforced. Overrides the `commitGraph.maxNewFilters` configuration.

I think this description should also detail what happens with those
commits for which no modified path Bloom filters are calculated, and
which commands will calculate them (even implicitly).

> ++
>  With the `--split[=<strategy>]` option, write the commit-graph as a
>  chain of multiple commit-graph files stored in
>  `<dir>/info/commit-graphs`. Commit-graph layers are merged based on the
> diff --git a/bloom.c b/bloom.c
> index ed54e96e57..8d07209c6b 100644
> --- a/bloom.c
> +++ b/bloom.c
> @@ -51,6 +51,21 @@ static int load_bloom_filter_from_graph(struct commit_graph *g,
>  	else
>  		start_index = 0;
>  
> +	if ((start_index == end_index) &&
> +	    (g->bloom_large && !bitmap_get(g->bloom_large, lex_pos))) {
> +		/*
> +		 * If the filter is zero-length, either (1) the filter has no
> +		 * changes, (2) the filter has too many changes, or (3) it
> +		 * wasn't computed (eg., due to '--max-new-filters').
> +		 *
> +		 * If either (1) or (2) is the case, the 'large' bit will be set
> +		 * for this Bloom filter. If it is unset, then it wasn't
> +		 * computed. In that case, return nothing, since we don't have
> +		 * that filter in the graph.
> +		 */
> +		return 0;
> +	}
> +
>  	filter->len = end_index - start_index;
>  	filter->data = (unsigned char *)(g->chunk_bloom_data +
>  					sizeof(unsigned char) * start_index +
> diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
> index 38f5f57d15..3500a6e1f1 100644
> --- a/builtin/commit-graph.c
> +++ b/builtin/commit-graph.c
> @@ -13,7 +13,8 @@ static char const * const builtin_commit_graph_usage[] = {
>  	N_("git commit-graph verify [--object-dir <objdir>] [--shallow] [--[no-]progress]"),
>  	N_("git commit-graph write [--object-dir <objdir>] [--append] "
>  	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
> -	   "[--changed-paths] [--[no-]progress] <split options>"),
> +	   "[--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress] "
> +	   "<split options>"),
>  	NULL
>  };
>  
> @@ -25,7 +26,8 @@ static const char * const builtin_commit_graph_verify_usage[] = {
>  static const char * const builtin_commit_graph_write_usage[] = {
>  	N_("git commit-graph write [--object-dir <objdir>] [--append] "
>  	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
> -	   "[--changed-paths] [--[no-]progress] <split options>"),
> +	   "[--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress] "
> +	   "<split options>"),
>  	NULL
>  };
>  
> @@ -162,6 +164,23 @@ static int read_one_commit(struct oidset *commits, struct progress *progress,
>  	return 0;
>  }
>  
> +static int write_option_max_new_filters(const struct option *opt,
> +					const char *arg,
> +					int unset)
> +{
> +	int *to = opt->value;
> +	if (unset)
> +		*to = -1;
> +	else {
> +		const char *s;
> +		*to = strtol(arg, (char **)&s, 10);
> +		if (*s)
> +			return error(_("%s expects a numerical value"),
> +				     optname(opt, opt->flags));
> +	}
> +	return 0;
> +}
> +
>  static int graph_write(int argc, const char **argv)
>  {
>  	struct string_list pack_indexes = STRING_LIST_INIT_NODUP;
> @@ -197,6 +216,9 @@ static int graph_write(int argc, const char **argv)
>  			N_("maximum ratio between two levels of a split commit-graph")),
>  		OPT_EXPIRY_DATE(0, "expire-time", &write_opts.expire_time,
>  			N_("only expire files older than a given date-time")),
> +		OPT_CALLBACK_F(0, "max-new-filters", &write_opts.max_new_filters,
> +			NULL, N_("maximum number of changed-path Bloom filters to compute"),
> +			0, write_option_max_new_filters),
>  		OPT_END(),
>  	};
>  
> @@ -205,6 +227,7 @@ static int graph_write(int argc, const char **argv)
>  	write_opts.size_multiple = 2;
>  	write_opts.max_commits = 0;
>  	write_opts.expire_time = 0;
> +	write_opts.max_new_filters = -1;
>  
>  	trace2_cmd_mode("write");
>  
> @@ -270,6 +293,16 @@ static int graph_write(int argc, const char **argv)
>  	return result;
>  }
>  
> +static int git_commit_graph_config(const char *var, const char *value, void *cb)
> +{
> +	if (!strcmp(var, "commitgraph.maxnewfilters")) {
> +		write_opts.max_new_filters = git_config_int(var, value);
> +		return 0;
> +	}
> +
> +	return git_default_config(var, value, cb);
> +}
> +
>  int cmd_commit_graph(int argc, const char **argv, const char *prefix)
>  {
>  	static struct option builtin_commit_graph_options[] = {
> @@ -283,7 +316,7 @@ int cmd_commit_graph(int argc, const char **argv, const char *prefix)
>  		usage_with_options(builtin_commit_graph_usage,
>  				   builtin_commit_graph_options);
>  
> -	git_config(git_default_config, NULL);
> +	git_config(git_commit_graph_config, &opts);
>  	argc = parse_options(argc, argv, prefix,
>  			     builtin_commit_graph_options,
>  			     builtin_commit_graph_usage,
> diff --git a/commit-graph.c b/commit-graph.c
> index 6886f319a5..4aae5471e3 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -954,7 +954,8 @@ struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit
>  }
>  
>  static int get_bloom_filter_large_in_graph(struct commit_graph *g,
> -					   const struct commit *c)
> +					   const struct commit *c,
> +					   uint32_t max_changed_paths)
>  {
>  	uint32_t graph_pos = commit_graph_position(c);
>  	if (graph_pos == COMMIT_NOT_FROM_GRAPH)
> @@ -965,6 +966,17 @@ static int get_bloom_filter_large_in_graph(struct commit_graph *g,
>  
>  	if (!(g && g->bloom_large))
>  		return 0;
> +	if (g->bloom_filter_settings->max_changed_paths != max_changed_paths) {
> +		/*
> +		 * Force all commits which are subject to a different
> +		 * 'max_changed_paths' limit to be recomputed from scratch.
> +		 *
> +		 * Note that this could likely be improved, but is ignored since
> +		 * all real-world graphs set the maximum number of changed paths
> +		 * at 512.

I don't understand what the second part of this comment is trying to
say; and real-world graphs might very well contain Bloom filters with
more than 512 modified paths, because the applying that limit was
buggy.

> +		 */
> +		return 0;
> +	}
>  	return bitmap_get(g->bloom_large, graph_pos - g->num_commits_in_base);
>  }
>  
> @@ -1470,6 +1482,7 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
>  	int i;
>  	struct progress *progress = NULL;
>  	int *sorted_commits;
> +	int max_new_filters;
>  
>  	init_bloom_filters();
>  	ctx->bloom_large = bitmap_word_alloc(ctx->commits.nr / BITS_IN_EWORD + 1);
> @@ -1486,10 +1499,15 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
>  		ctx->order_by_pack ? commit_pos_cmp : commit_gen_cmp,
>  		&ctx->commits);
>  
> +	max_new_filters = ctx->opts->max_new_filters >= 0 ?
> +		ctx->opts->max_new_filters : ctx->commits.nr;
> +
>  	for (i = 0; i < ctx->commits.nr; i++) {
>  		int pos = sorted_commits[i];
>  		struct commit *c = ctx->commits.list[pos];
> -		if (get_bloom_filter_large_in_graph(ctx->r->objects->commit_graph, c)) {
> +		if (get_bloom_filter_large_in_graph(ctx->r->objects->commit_graph,
> +						    c,
> +						    ctx->bloom_settings->max_changed_paths)) {
>  			bitmap_set(ctx->bloom_large, pos);
>  			ctx->count_bloom_filter_known_large++;
>  		} else {
> @@ -1497,7 +1515,7 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
>  			struct bloom_filter *filter = get_or_compute_bloom_filter(
>  				ctx->r,
>  				c,
> -				1,
> +				ctx->count_bloom_filter_computed < max_new_filters,
>  				ctx->bloom_settings,
>  				&computed);
>  			if (computed) {
> @@ -1507,7 +1525,8 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx)
>  					ctx->count_bloom_filter_found_large++;
>  				}
>  			}
> -			ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
> +			if (filter)
> +				ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
>  		}
>  		display_progress(progress, i + 1);
>  	}
> diff --git a/commit-graph.h b/commit-graph.h
> index af08c4505d..75ef83708b 100644
> --- a/commit-graph.h
> +++ b/commit-graph.h
> @@ -114,6 +114,7 @@ struct commit_graph_opts {
>  	int max_commits;
>  	timestamp_t expire_time;
>  	enum commit_graph_split_flags flags;
> +	int max_new_filters;
>  };
>  
>  /*
> diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
> index 6859d85369..3aab8ffbe3 100755
> --- a/t/t4216-log-bloom.sh
> +++ b/t/t4216-log-bloom.sh
> @@ -286,4 +286,23 @@ test_expect_success 'Bloom generation does not recompute too-large filters' '
>  	)
>  '
>  
> +test_expect_success 'Bloom generation is limited by --max-new-filters' '
> +	(
> +		cd limits &&
> +		test_commit c2 filter &&
> +		test_commit c3 filter &&
> +		test_commit c4 no-filter &&
> +		test_bloom_filters_computed "--reachable --changed-paths --split=replace --max-new-filters=2" \
> +			2 0 2
> +	)
> +'
> +
> +test_expect_success 'Bloom generation backfills previously-skipped filters' '
> +	(
> +		cd limits &&
> +		test_bloom_filters_computed "--reachable --changed-paths --split=replace --max-new-filters=1" \
> +			2 0 1
> +	)
> +'
> +
>  test_done
> -- 
> 2.28.0.rc1.13.ge78abce653

  parent reply	other threads:[~2020-08-18 22:23 UTC|newest]

Thread overview: 117+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 18:57 [PATCH 00/10] more miscellaneous Bloom filter improvements Taylor Blau
2020-08-03 18:57 ` [PATCH 01/10] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-08-04  7:24   ` Jeff King
2020-08-04 20:08     ` Taylor Blau
2020-08-03 18:57 ` [PATCH 02/10] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-08-03 18:57 ` [PATCH 03/10] t4216: use an '&&'-chain Taylor Blau
2020-08-03 18:57 ` [PATCH 04/10] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-08-03 18:57 ` [PATCH 05/10] commit-graph: respect 'commitgraph.readChangedPaths' Taylor Blau
2020-08-03 18:57 ` [PATCH 06/10] commit-graph.c: sort index into commits list Taylor Blau
2020-08-04 12:31   ` Derrick Stolee
2020-08-04 20:10     ` Taylor Blau
2020-08-03 18:57 ` [PATCH 07/10] commit-graph: add large-filters bitmap chunk Taylor Blau
2020-08-03 18:59   ` Taylor Blau
2020-08-04 12:57   ` Derrick Stolee
2020-08-03 18:57 ` [PATCH 08/10] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-08-04 13:00   ` Derrick Stolee
2020-08-04 20:12     ` Taylor Blau
2020-08-03 18:57 ` [PATCH 09/10] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-08-03 18:57 ` [PATCH 10/10] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-08-04 13:03   ` Derrick Stolee
2020-08-04 20:14     ` Taylor Blau
2020-08-05 17:01 ` [PATCH v2 00/14] more miscellaneous Bloom filter improvements Taylor Blau
2020-08-05 17:01   ` [PATCH v2 01/14] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-08-05 17:02   ` [PATCH v2 02/14] t4216: use an '&&'-chain Taylor Blau
2020-08-05 17:02   ` [PATCH v2 03/14] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-08-05 17:02   ` [PATCH v2 04/14] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-08-05 17:02   ` [PATCH v2 05/14] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-08-05 17:02   ` [PATCH v2 06/14] commit-graph.c: store maximum changed paths Taylor Blau
2020-08-05 17:02   ` [PATCH v2 07/14] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-08-05 17:02   ` [PATCH v2 08/14] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-08-05 17:02   ` [PATCH v2 09/14] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-08-05 17:02   ` [PATCH v2 10/14] commit-graph.c: sort index into commits list Taylor Blau
2020-08-05 17:02   ` [PATCH v2 11/14] csum-file.h: introduce 'hashwrite_be64()' Taylor Blau
2020-08-05 17:02   ` [PATCH v2 12/14] commit-graph: add large-filters bitmap chunk Taylor Blau
2020-08-05 21:01     ` Junio C Hamano
2020-08-05 21:17       ` Taylor Blau
2020-08-05 22:21         ` Junio C Hamano
2020-08-05 22:25           ` Taylor Blau
2020-08-11 13:48             ` Taylor Blau
2020-08-11 18:59               ` Junio C Hamano
2020-08-05 17:03   ` [PATCH v2 13/14] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-08-05 17:03   ` [PATCH v2 14/14] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-08-11 20:51 ` [PATCH v3 00/14] more miscellaneous Bloom filter improvements Taylor Blau
2020-08-11 20:51   ` [PATCH v3 01/14] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-08-11 21:18     ` SZEDER Gábor
2020-08-11 21:21       ` Taylor Blau
2020-08-11 21:27         ` SZEDER Gábor
2020-08-11 21:34           ` Taylor Blau
2020-08-11 23:55             ` SZEDER Gábor
2020-08-12 11:48               ` Derrick Stolee
2020-08-14 20:17                 ` Taylor Blau
2020-08-11 20:51   ` [PATCH v3 02/14] t4216: use an '&&'-chain Taylor Blau
2020-08-11 20:51   ` [PATCH v3 03/14] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-08-11 20:51   ` [PATCH v3 04/14] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-08-11 20:51   ` [PATCH v3 05/14] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-08-11 20:51   ` [PATCH v3 06/14] commit-graph.c: store maximum changed paths Taylor Blau
2020-08-11 20:51   ` [PATCH v3 07/14] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-08-11 20:51   ` [PATCH v3 11/14] csum-file.h: introduce 'hashwrite_be64()' Taylor Blau
2020-08-11 20:51   ` [PATCH v3 08/14] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-08-11 20:51   ` [PATCH v3 09/14] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-08-11 20:52   ` [PATCH v3 10/14] commit-graph.c: sort index into commits list Taylor Blau
2020-08-11 20:52   ` [PATCH v3 12/14] commit-graph: add large-filters bitmap chunk Taylor Blau
2020-08-11 21:11     ` Derrick Stolee
2020-08-11 21:18       ` Taylor Blau
2020-08-11 22:05         ` Taylor Blau
2020-08-19 13:35     ` SZEDER Gábor
2020-09-02 20:23       ` Taylor Blau
2020-09-01 14:35     ` SZEDER Gábor
2020-09-02 20:40       ` Taylor Blau
2020-08-11 20:52   ` [PATCH v3 13/14] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-08-19  9:56     ` SZEDER Gábor
2020-09-02 21:02       ` Taylor Blau
2020-08-11 20:52   ` [PATCH v3 14/14] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-08-12 11:49     ` SZEDER Gábor
2020-08-14 20:20       ` Taylor Blau
2020-08-17 22:50         ` SZEDER Gábor
2020-09-02 21:03           ` Taylor Blau
2020-08-12 12:29     ` Derrick Stolee
2020-08-14 20:10       ` Taylor Blau
2020-08-18 22:23     ` SZEDER Gábor [this message]
2020-09-03 16:35       ` Taylor Blau
2020-08-19  8:20     ` SZEDER Gábor
2020-09-03 16:42       ` Taylor Blau
2020-09-04  8:50         ` SZEDER Gábor
2020-09-01 14:36     ` SZEDER Gábor
2020-09-03 18:49       ` Taylor Blau
2020-09-03 21:45   ` [PATCH v3 00/14] more miscellaneous Bloom filter improvements Junio C Hamano
2020-09-03 22:33     ` Taylor Blau
2020-09-03 22:45 ` [PATCH v4 " Taylor Blau
2020-09-03 22:46   ` [PATCH v4 01/14] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-03 22:46   ` [PATCH v4 02/14] t4216: use an '&&'-chain Taylor Blau
2020-09-03 22:46   ` [PATCH v4 03/14] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-03 22:46   ` [PATCH v4 04/14] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-03 22:46   ` [PATCH v4 05/14] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-03 22:46   ` [PATCH v4 06/14] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-03 22:46   ` [PATCH v4 07/14] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-05 17:22     ` Jakub Narębski
2020-09-05 17:38       ` Taylor Blau
2020-09-05 17:50         ` Jakub Narębski
2020-09-05 18:01           ` Taylor Blau
2020-09-05 18:18             ` Jakub Narębski
2020-09-05 18:38               ` Taylor Blau
2020-09-05 18:55                 ` Taylor Blau
2020-09-05 19:04                   ` SZEDER Gábor
2020-09-05 19:49                     ` Taylor Blau
2020-09-06 21:52                       ` Junio C Hamano
2020-09-03 22:46   ` [PATCH v4 08/14] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-03 22:46   ` [PATCH v4 09/14] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-03 22:46   ` [PATCH v4 10/14] commit-graph.c: sort index into commits list Taylor Blau
2020-09-03 22:46   ` [PATCH v4 11/14] csum-file.h: introduce 'hashwrite_be64()' Taylor Blau
2020-09-04 20:18     ` René Scharfe
2020-09-04 20:22       ` Taylor Blau
2020-09-03 22:46   ` [PATCH v4 12/14] commit-graph: add large-filters bitmap chunk Taylor Blau
2020-09-03 22:46   ` [PATCH v4 13/14] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-04 15:20     ` Taylor Blau
2020-09-03 22:47   ` [PATCH v4 14/14] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-04 14:39   ` [PATCH v4 00/14] more miscellaneous Bloom filter improvements Derrick Stolee

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