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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"Garima Singh" <garima.singh@microsoft.com>,
	"Derrick Stolee" <stolee@gmail.com>,
	"Jakub Narebski" <jnareb@gmail.com>, "Jeff King" <peff@peff.net>,
	"Taylor Blau" <me@ttaylorr.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>
Subject: [PATCH 22/34] commit-graph: write the Modified Path Bloom Filters chunk
Date: Fri, 29 May 2020 10:50:26 +0200
Message-ID: <20200529085038.26008-23-szeder.dev@gmail.com> (raw)
In-Reply-To: <20200529085038.26008-1-szeder.dev@gmail.com>

Write the Modified Path Bloom Filters chunk first, keeping track of
the offsets where each (non-embedded) Bloom filter has been written,
and then write the Modified Path Bloom Filter Index chunk using those
recorded offsets.
---
 commit-graph.c | 78 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 69 insertions(+), 9 deletions(-)

diff --git a/commit-graph.c b/commit-graph.c
index fb24600bb3..3210ec2f93 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -26,6 +26,7 @@
 #define GRAPH_CHUNKID_EXTRAEDGES 0x45444745 /* "EDGE" */
 #define GRAPH_CHUNKID_BASE 0x42415345 /* "BASE" */
 #define GRAPH_CHUNKID_MODIFIED_PATH_BLOOM_FILTER_INDEX 0x4d504249 /* "MPBI" */
+#define GRAPH_CHUNKID_MODIFIED_PATH_BLOOM_FILTERS 0x4d504246 /* "MPBF" */
 #define GRAPH_CHUNKID_MODIFIED_PATH_BLOOM_FILTER_EXCLUDES 0x4d504258 /* "MPBX" */
 
 #define GRAPH_DATA_WIDTH (the_hash_algo->rawsz + 16)
@@ -56,6 +57,12 @@
 
 struct modified_path_bloom_filter_info {
 	struct bloom_filter filter;
+	/*
+	 * The offset relative to the start of the Modified Path Bloom
+	 * Filters chunk where this Bloom filter has been written,
+	 * -1 before that.
+	 */
+	uint64_t offset;
 };
 
 static void free_modified_path_bloom_filter_info_in_slab(
@@ -1019,6 +1026,9 @@ struct write_commit_graph_context {
 		 */
 		uint32_t *hashes;
 		int hashes_nr, hashes_alloc;
+
+		/* Excluding embedded modified path Bloom filters */
+		uint64_t total_filter_size;
 	} mpbfctx;
 };
 
@@ -1219,6 +1229,43 @@ static int write_graph_chunk_extra_edges(struct hashfile *f,
 	return 0;
 }
 
+static int write_graph_chunk_modified_path_bloom_filters(struct hashfile *f,
+		struct write_commit_graph_context *ctx)
+{
+	uint64_t offset = 0;
+	int i;
+
+	for (i = 0; i < ctx->commits.nr; i++) {
+		struct commit *commit = ctx->commits.list[i];
+		struct modified_path_bloom_filter_info *bfi;
+		unsigned int filter_size;
+
+		display_progress(ctx->progress, ++ctx->progress_cnt);
+
+		bfi = modified_path_bloom_filters_peek(
+				&modified_path_bloom_filters, commit);
+
+		if (!bfi || !bfi->filter.nr_bits)
+			continue;
+		if (bfi->filter.nr_bits == GRAPH_MODIFIED_PATH_BLOOM_FILTER_EMBEDDED_NR_BITS)
+			continue;
+
+		if (offset >> 62)
+			BUG("offset %lu is too large for the Modified Path Bloom Filter Index chunk",
+			    offset);
+
+		bfi->offset = offset;
+
+		filter_size = bloom_filter_bytes(&bfi->filter);
+
+		hashwrite_be32(f, bfi->filter.nr_bits);
+		hashwrite(f, bfi->filter.bits, filter_size);
+
+		offset += sizeof(uint32_t) + filter_size;
+	}
+	return 0;
+}
+
 static int write_graph_chunk_modified_path_bloom_index(struct hashfile *f,
 		struct write_commit_graph_context *ctx)
 {
@@ -1247,8 +1294,11 @@ static int write_graph_chunk_modified_path_bloom_index(struct hashfile *f,
 			 */
 			filterdata[0] |= 1 << 7;
 			hashwrite(f, filterdata, sizeof(filterdata));
+		} else if (bfi->offset != -1) {
+			uint64_t offset = htonll(bfi->offset);
+			hashwrite(f, &offset, sizeof(offset));
 		} else
-			BUG("writing non-embedded Bloom filters is not implemented yet");
+			BUG("modified path Bloom filter offset is still -1?!");
 	}
 	return 0;
 }
@@ -1424,17 +1474,20 @@ static void create_modified_path_bloom_filter(
 	diff_tree_oid(parent_oid, &commit->object.oid, "", &mpbfctx->diffopt);
 	path_component_count = mpbfctx->hashes_nr / mpbfctx->num_hashes;
 
+	bfi = modified_path_bloom_filters_at(&modified_path_bloom_filters,
+					     commit);
+	bfi->offset = -1;
 	if (path_component_count > mpbfctx->embedded_limit) {
-		/* Not implemented yet. */
-	} else {
-		bfi = modified_path_bloom_filters_at(
-				&modified_path_bloom_filters, commit);
-
+		bloom_filter_init(&bfi->filter, mpbfctx->num_hashes,
+				  path_component_count);
+		mpbfctx->total_filter_size += sizeof(uint32_t) +
+					      bloom_filter_bytes(&bfi->filter);
+	} else
 		bloom_filter_init_with_size(&bfi->filter,
 				GRAPH_MODIFIED_PATH_BLOOM_FILTER_EMBEDDED_NR_BITS);
-		bloom_filter_set_bits(&bfi->filter, mpbfctx->hashes,
-				      mpbfctx->hashes_nr);
-	}
+
+	bloom_filter_set_bits(&bfi->filter, mpbfctx->hashes,
+			      mpbfctx->hashes_nr);
 }
 
 static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
@@ -1845,6 +1898,13 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
 		chunks_nr++;
 	}
 	if (ctx->mpbfctx.use_modified_path_bloom_filters) {
+		if (ctx->mpbfctx.total_filter_size) {
+			ALLOC_GROW(chunks, chunks_nr + 1, chunks_alloc);
+			chunks[chunks_nr].id = GRAPH_CHUNKID_MODIFIED_PATH_BLOOM_FILTERS;
+			chunks[chunks_nr].size = ctx->mpbfctx.total_filter_size;
+			chunks[chunks_nr].write_fn = write_graph_chunk_modified_path_bloom_filters;
+			chunks_nr++;
+		}
 		ALLOC_GROW(chunks, chunks_nr + 1, chunks_alloc);
 		chunks[chunks_nr].id = GRAPH_CHUNKID_MODIFIED_PATH_BLOOM_FILTER_INDEX;
 		chunks[chunks_nr].size = sizeof(uint8_t) +
-- 
2.27.0.rc1.431.g5c813f95dc


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  8:50 [PoC PATCH 00/34] An alternative modified path Bloom filters implementation SZEDER Gábor
2020-05-28 22:09 ` Johannes Schindelin
2020-05-29  8:50 ` [PATCH 01/34] tree-walk.c: don't match submodule entries for 'submod/anything' SZEDER Gábor
2020-05-29  8:50 ` [PATCH 02/34] commit-graph: fix parsing the Chunk Lookup table SZEDER Gábor
2020-05-29  8:50 ` [PATCH 03/34] commit-graph-format.txt: all multi-byte numbers are in network byte order SZEDER Gábor
2020-05-29  8:50 ` [PATCH 04/34] commit-slab: add a function to deep free entries on the slab SZEDER Gábor
2020-06-04 16:43   ` Derrick Stolee
2020-06-27 15:56     ` SZEDER Gábor
2020-06-29 11:30       ` Derrick Stolee
2020-05-29  8:50 ` [PATCH 05/34] diff.h: drop diff_tree_oid() & friends' return value SZEDER Gábor
2020-05-29  8:50 ` [PATCH 06/34] commit-graph: clean up #includes SZEDER Gábor
2020-05-29  8:50 ` [PATCH 07/34] commit-graph: simplify parse_commit_graph() #1 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 08/34] commit-graph: simplify parse_commit_graph() #2 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 09/34] commit-graph: simplify write_commit_graph_file() #1 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 10/34] commit-graph: simplify write_commit_graph_file() #2 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 11/34] commit-graph: allocate the 'struct chunk_info' array dinamically SZEDER Gábor
2020-05-29  8:50 ` [PATCH 12/34] commit-graph: unify the signatures of all write_graph_chunk_*() functions SZEDER Gábor
2020-05-29  8:50 ` [PATCH 13/34] commit-graph: simplify write_commit_graph_file() #3 SZEDER Gábor
2020-05-29  8:50 ` [PATCH 14/34] commit-graph: check chunk sizes after writing SZEDER Gábor
2020-05-29  8:50 ` [PATCH 15/34] commit-graph-format.txt: document the modified path Bloom filter chunks SZEDER Gábor
2020-06-02 17:59   ` SZEDER Gábor
2020-05-29  8:50 ` [PATCH 16/34] Add a generic and minimal Bloom filter implementation SZEDER Gábor
2020-05-29  8:50 ` [PATCH 17/34] Import a streaming-capable Murmur3 hash function implementation SZEDER Gábor
2020-05-29  8:50 ` [PATCH 18/34] commit-graph: write "empty" Modified Path Bloom Filter Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 19/34] commit-graph: add commit slab for modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 20/34] commit-graph: fill the Modified Path Bloom Filter Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 21/34] commit-graph: load and use " SZEDER Gábor
2020-05-29  8:50 ` SZEDER Gábor [this message]
2020-05-29  8:50 ` [PATCH 23/34] commit-graph: load and use the Modified Path Bloom Filters chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 24/34] commit-graph: check all leading directories in modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 25/34] commit-graph: check embedded modified path Bloom filters with a mask SZEDER Gábor
2020-05-29  8:50 ` [PATCH 26/34] commit-graph: deduplicate modified path Bloom filters SZEDER Gábor
2020-05-29  8:50 ` [PATCH 27/34] commit-graph: load modified path Bloom filters for merge commits SZEDER Gábor
2020-05-29  8:50 ` [PATCH 28/34] commit-graph: write Modified Path Bloom Filter Merge Index chunk SZEDER Gábor
2020-05-29  8:50 ` [PATCH 29/34] commit-graph: extract init and free write_commit_graph_context SZEDER Gábor
2020-05-29  8:50 ` [PATCH 30/34] commit-graph: move write_commit_graph_reachable below write_commit_graph SZEDER Gábor
2020-05-29  8:50 ` [PATCH 31/34] t7007-show: make the first test compatible with the next patch SZEDER Gábor
2020-05-29  8:50 ` [PATCH 32/34] PoC commit-graph: use revision walk machinery for '--reachable' SZEDER Gábor
2020-05-29  8:50 ` [PATCH 33/34] commit-graph: write modified path Bloom filters in "history order" SZEDER Gábor
2020-05-29  8:50 ` [PATCH 34/34] commit-graph: use modified path Bloom filters with wildcards, if possible SZEDER Gábor
2020-05-29 13:59 ` [PoC PATCH 00/34] An alternative modified path Bloom filters implementation Derrick Stolee
2020-06-01 23:25 ` Taylor Blau
2020-06-02 17:08   ` Junio C Hamano

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