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From: Jakub Narebski <jnareb@gmail.com>
To: "Garima Singh via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, "Derrick Stolee" <stolee@gmail.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>,
	"Jonathan Tan" <jonathantanmy@google.com>,
	"Jeff Hostetler" <jeffhost@microsoft.com>,
	"Taylor Blau" <me@ttaylorr.com>, "Jeff King" <peff@peff.net>,
	"Garima Singh" <garimasigit@gmail.com>,
	"Christian Couder" <christian.couder@gmail.com>,
	"Emily Shaffer" <emilyshaffer@gmail.com>,
	"Junio C Hamano" <gitster@pobox.com>,
	"Garima Singh" <garima.singh@microsoft.com>
Subject: Re: [PATCH v2 04/11] commit-graph: compute Bloom filters for changed paths
Date: Mon, 17 Feb 2020 22:56:12 +0100	[thread overview]
Message-ID: <86k14klvyb.fsf@gmail.com> (raw)
In-Reply-To: <c17bbcbc66ea77bb480391804d1f2db66ffa0926.1580943390.git.gitgitgadget@gmail.com>

"Garima Singh via GitGitGadget" <gitgitgadget@gmail.com> writes:

> From: Garima Singh <garima.singh@microsoft.com>
> Subject: [PATCH v2 04/11] commit-graph: compute Bloom filters for changed paths
>
> Compute Bloom filters for the paths that changed between a commit and its
> first parent using the implementation in bloom.c, when the
> COMMIT_GRAPH_WRITE_CHANGED_PATHS flag is set. This computation is done on a
> commit-by-commit basis. We will write these Bloom filters to the commit graph
> file in the next change.

I have no major complaints about the contents of this patch (except lack
of test, and type of total_bloom_filter_data_size), but the commit
message could have been worded better.

I would write something like this instead:

  Add new COMMIT_GRAPH_WRITE_CHANGED_PATHS flag that makes Git compute
  Bloom filters that store the information about changed paths (that
  changed between a commit and its first parent) for each commit in the
  commit-graph.  This computation is done on a commit-by-commit basis.

  We will write these Bloom filters to the commit-graph file, to store
  this data on disk, in the next change in this series.

In my opinion the fact that we compute Bloom filters for each and every
commit in the commit-graph file is more important than quite obvious
fact that we use implementation from bloom.c.

>
> Helped-by: Derrick Stolee <dstolee@microsoft.com>
> Signed-off-by: Garima Singh <garima.singh@microsoft.com>
> ---
>  commit-graph.c | 32 +++++++++++++++++++++++++++++++-
>  commit-graph.h |  3 ++-
>  2 files changed, 33 insertions(+), 2 deletions(-)

It would be good to have at least sanity check of this feature, perhaps
one that would check that the number of per-commit Bloom filters on slab
matches the number of commits in the commit-graph.

It could look something like this:

  test_expect_success 'create Bloom filters for all commit-graph commits' '
  	# create commit-graph with 2 commits
  	git rev-parse HEAD HEAD^ | git commit-graph write --stdin-commits &&
  	# generate Bloom filters for commit-graph commits
  	cat >commands <<\-EOF &&
  	add-graph-commits
  	filters-count
  	EOF
  	NUM_FILTERS=$(git test-tool bloom <commands) %%
  	test "$NUM_FILTERS" -eq 2
  '

>
> diff --git a/commit-graph.c b/commit-graph.c
> index 3c4d411326..724bfcffc4 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -16,6 +16,7 @@
>  #include "hashmap.h"
>  #include "replace-object.h"
>  #include "progress.h"
> +#include "bloom.h"
>  
>  #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
>  #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
> @@ -795,9 +796,11 @@ struct write_commit_graph_context {
>  	unsigned append:1,
>  		 report_progress:1,
>  		 split:1,
> -		 check_oids:1;
> +		 check_oids:1,
> +		 changed_paths:1;

All right, this flag will be used for handling future `--changed-paths`
option to the `git commit-graph write`.

>  
>  	const struct split_commit_graph_opts *split_opts;
> +	uint32_t total_bloom_filter_data_size;

This is total size of Bloom filters data, in bytes, that will later be
used for BDAT chunk size.  However the commit-graph format uses 8 bytes
for byte-offset, not 4 bytes.  Why it is uint32_t and not uint64_t then?

>  };
>  
>  static void write_graph_chunk_fanout(struct hashfile *f,
> @@ -1140,6 +1143,28 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
>  	stop_progress(&ctx->progress);
>  }
>  
> +static void compute_bloom_filters(struct write_commit_graph_context *ctx)
> +{
> +	int i;
> +	struct progress *progress = NULL;
> +
> +	load_bloom_filters();
> +
> +	if (ctx->report_progress)
> +		progress = start_progress(
> +			_("Computing commit diff Bloom filters"),
> +			ctx->commits.nr);
> +

Shouldn't we initialize ctx->total_bloom_filter_data_size to 0 here?  We
cannot use compute_bloom_filters() to _update_ Bloom filters data, I
think -- we don't distinguish here between new and existing data (where
existing data size is already included in total Bloom filters size).  At
least I don't think so.


> +	for (i = 0; i < ctx->commits.nr; i++) {
> +		struct commit *c = ctx->commits.list[i];

Here we process commit in whatever order commits are in the
commits.list, which probably means lexicographical order, in practice
random order.

> +		struct bloom_filter *filter = get_bloom_filter(ctx->r, c);
> +		ctx->total_bloom_filter_data_size += sizeof(uint64_t) * filter->len;
> +		display_progress(progress, i + 1);
> +	}
> +
> +	stop_progress(&progress);
> +}
> +
>  static int add_ref_to_list(const char *refname,
>  			   const struct object_id *oid,
>  			   int flags, void *cb_data)

> @@ -1794,6 +1819,8 @@ int write_commit_graph(const char *obj_dir,
>  	ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
>  	ctx->check_oids = flags & COMMIT_GRAPH_WRITE_CHECK_OIDS ? 1 : 0;
>  	ctx->split_opts = split_opts;
> +	ctx->changed_paths = flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS ? 1 : 0;
> +	ctx->total_bloom_filter_data_size = 0;
>  
>  	if (ctx->split) {
>  		struct commit_graph *g;
> @@ -1888,6 +1915,9 @@ int write_commit_graph(const char *obj_dir,
>  
>  	compute_generation_numbers(ctx);
>  
> +	if (ctx->changed_paths)
> +		compute_bloom_filters(ctx);
> +

All right.

>  	res = write_commit_graph_file(ctx);
>  
>  	if (ctx->split)
> diff --git a/commit-graph.h b/commit-graph.h
> index 7f5c933fa2..952a4b83be 100644
> --- a/commit-graph.h
> +++ b/commit-graph.h
> @@ -76,7 +76,8 @@ enum commit_graph_write_flags {
>  	COMMIT_GRAPH_WRITE_PROGRESS   = (1 << 1),
>  	COMMIT_GRAPH_WRITE_SPLIT      = (1 << 2),
>  	/* Make sure that each OID in the input is a valid commit OID. */
> -	COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3)
> +	COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3),
> +	COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 4)

All right.


Side note: perhaps we could add trailing comma after new enum entry,
that is

  +	COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 4),

following new CodingGuidelines recommendation

 - We try to support a wide range of C compilers to compile Git with,
   including old ones.  You should not use features from newer C
   standard, even if your compiler groks them.

   There are a few exceptions to this guideline:

   . since early 2012 with e1327023ea, we have been using an enum
     definition whose last element is followed by a comma.  This, like
     an array initializer that ends with a trailing comma, can be used
     to reduce the patch noise when adding a new identifier at the end.

https://github.com/git/git/blob/master/Documentation/CodingGuidelines#L197

>  };
>  
>  struct split_commit_graph_opts {

  reply	other threads:[~2020-02-17 21:56 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 [this message]
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   ` [PATCH v2 08/11] commit-graph: reuse existing Bloom filters during write Garima Singh via GitGitGadget
2020-02-20 18:48     ` 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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