From patchwork Mon Aug 21 21:44:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Taylor Blau X-Patchwork-Id: 13359856 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAA90EE4996 for ; Mon, 21 Aug 2023 21:44:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231163AbjHUVoy (ORCPT ); Mon, 21 Aug 2023 17:44:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231150AbjHUVox (ORCPT ); Mon, 21 Aug 2023 17:44:53 -0400 Received: from mail-yb1-xb30.google.com (mail-yb1-xb30.google.com [IPv6:2607:f8b0:4864:20::b30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D23A13E for ; Mon, 21 Aug 2023 14:44:44 -0700 (PDT) Received: by mail-yb1-xb30.google.com with SMTP id 3f1490d57ef6-d73ee75a796so3802548276.0 for ; Mon, 21 Aug 2023 14:44:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ttaylorr-com.20221208.gappssmtp.com; s=20221208; t=1692654283; x=1693259083; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=sGtERO8/JYDWyA7SFLHcgHl+MdA5CVEly2K83HRrf1g=; b=vccFGg1WPtuc33Ft5T4+OLdyZbgUfsoZklCDFVcmmlwzwtE5lMJ8yHhLEQ5YfKvIOM cyDDzeuXhfUQgU8Mj27UW8cNu1V0T3fd8J4LZDY9zi3tQBobdlA+F75Lf01jYc7iXI1A vWmKZbLl9d50r53hvRIpYxP+w3hJFAhQ9Gl7q1/TjHxyW0YCxqslb6jnJZXbjBz2vM5c 2FezCgUUx28i0emmWBQk3CZoATHoyzR/ZOpA/3Koo50si/ZxbRcn1WzReRMvNQyslony KNHsiuB7Y7uBHwbmPXmBS2/3NuuE6I71ZNEJIi91b2VGZLzBRQVO/pslBxChfzLVmQO5 7TzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692654283; x=1693259083; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=sGtERO8/JYDWyA7SFLHcgHl+MdA5CVEly2K83HRrf1g=; b=PoIFgCOY2afGNilJtSbKp6HrMaxbJ59TPkxvwY1Ak1MB0JcCSYk6My7cPsu+y9Zob4 oZlRgV7bguB9aEBy2vDe4tvcNfO4DKMWvvZT2ttZrJe37+S+haHXxY+3JG6MPFemSqTd 93WyKayzOvEbFdtAfZwrhHt7UObcSBBA1jiMTuEU3T4kxoJVqk53I8A/gA4dRRLV3ns3 10CE0Wu2TJ44HzAXy2IYt5Hh/PcgY2NbjYEtWkoFeJN1uvcnS0s+rSxVRDWr08td5/r6 514dntCIT8ukKu+2Wba1BCzj4Y6GKFiL071tyZWg/ktdphQAstL39IteeGtxTfMFfRTt 568g== X-Gm-Message-State: AOJu0Yz6oDNYfC2bEAoRDMQZpTwpsO5OXRYnlElNqt0tlvjhzOvXDoKN w6Ckms+kgT7E/Fq9GTVZ3PAV1HRiZ+9pNKj/q3DEAw== X-Google-Smtp-Source: AGHT+IFYskbYYNr8yoLrzhOgzgcg5YBQOoM/wwxW5Ygm8PvpeyRQOt0UPIPgtDD4K9q+wlrAkRN6mg== X-Received: by 2002:a25:ae1b:0:b0:d2c:32cb:c631 with SMTP id a27-20020a25ae1b000000b00d2c32cbc631mr7952144ybj.27.1692654283523; Mon, 21 Aug 2023 14:44:43 -0700 (PDT) Received: from localhost (104-178-186-189.lightspeed.milwwi.sbcglobal.net. [104.178.186.189]) by smtp.gmail.com with ESMTPSA id e142-20020a25d394000000b00d743e00bb03sm1947786ybf.39.2023.08.21.14.44.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Aug 2023 14:44:43 -0700 (PDT) Date: Mon, 21 Aug 2023 17:44:42 -0400 From: Taylor Blau To: git@vger.kernel.org Cc: Jonathan Tan , Junio C Hamano , Jeff King , Derrick Stolee Subject: [PATCH 14/15] commit-graph: reuse existing Bloom filters where possible Message-ID: <4f69a4c41d935ede83bd89871f2f84b334953d8f.1692654233.git.me@ttaylorr.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org In 9e4df4da07 (commit-graph: new filter ver. that fixes murmur3, 2023-08-01), a bug was described where it's possible for Git to produce non-murmur3 hashes when the platform's "char" type is signed, and there are paths with characters whose highest bit is set (i.e. all characters >= 0x80). That patch allows the caller to control which version of Bloom filters are read and written. However, even on platforms with a signed "char" type, it is possible to reuse existing Bloom filters if and only if there are no changed paths in any commit's first parent tree-diff whose characters have their highest bit set. When this is the case, we can reuse the existing filter without having to compute a new one. This is done by marking trees which are known to have (or not have) any such paths. When a commit's root tree is verified to not have any such paths, we mark it as such and declare that the commit's Bloom filter is reusable. Note that this heuristic only goes in one direction. If neither a commit nor its first parent have any paths in their trees with non-ASCII characters, then we know for certain that a path with non-ASCII characters will not appear in a tree-diff against that commit's first parent. The reverse isn't necessarily true: just because the tree-diff doesn't contain any such paths does not imply that no such paths exist in either tree. So we end up recomputing some Bloom filters that we don't strictly have to (i.e. their bits are the same no matter which version of murmur3 we use). But culling these out is impossible, since we'd have to perform the full tree-diff, which is the same effort as computing the Bloom filter from scratch. But because we can cache our results in each tree's flag bits, we can often avoid recomputing many filters, thereby reducing the time it takes to run $ git commit-graph write --changed-paths --reachable when upgrading from v1 to v2 Bloom filters. To benchmark this, let's generate a commit-graph in linux.git with v1 changed-paths in generation order[^1]: $ git clone git@github.com:torvalds/linux.git $ cd linux $ git commit-graph write --reachable --changed-paths $ graph=".git/objects/info/commit-graph" $ mv $graph{,.bak} Then let's time how long it takes to go from v1 to v2 filters (with and without the upgrade path enabled), resetting the state of the commit-graph each time: $ git config commitGraph.changedPathsVersion 2 $ hyperfine -p 'cp -f $graph.bak $graph' -L v 0,1 \ 'GIT_TEST_UPGRADE_BLOOM_FILTERS={v} git.compile commit-graph write --reachable --changed-paths' On linux.git (where there aren't any non-ASCII paths), the timings indicate that this patch represents a speed-up over recomputing all Bloom filters from scratch: Benchmark 1: GIT_TEST_UPGRADE_BLOOM_FILTERS=0 git.compile commit-graph write --reachable --changed-paths Time (mean ± σ): 124.873 s ± 0.316 s [User: 124.081 s, System: 0.643 s] Range (min … max): 124.621 s … 125.227 s 3 runs Benchmark 2: GIT_TEST_UPGRADE_BLOOM_FILTERS=1 git.compile commit-graph write --reachable --changed-paths Time (mean ± σ): 79.271 s ± 0.163 s [User: 74.611 s, System: 4.521 s] Range (min … max): 79.112 s … 79.437 s 3 runs Summary 'GIT_TEST_UPGRADE_BLOOM_FILTERS=1 git.compile commit-graph write --reachable --changed-paths' ran 1.58 ± 0.01 times faster than 'GIT_TEST_UPGRADE_BLOOM_FILTERS=0 git.compile commit-graph write --reachable --changed-paths' On git.git, we do have some non-ASCII paths, giving us a more modest improvement from 4.163 seconds to 3.348 seconds, for a 1.24x speed-up. On my machine, the stats for git.git are: - 8,285 Bloom filters computed from scratch - 10 Bloom filters generated as empty - 4 Bloom filters generated as truncated due to too many changed paths - 65,114 Bloom filters were reused when transitioning from v1 to v2. [^1]: Note that this is is important, since `--stdin-packs` or `--stdin-commits` orders commits in the commit-graph by their pack position (with `--stdin-packs`) or in the raw input (with `--stdin-commits`). Since we compute Bloom filters in the same order that commits appear in the graph, we must see a commit's (first) parent before we process the commit itself. This is only guaranteed to happen when sorting commits by their generation number. Signed-off-by: Taylor Blau --- bloom.c | 90 ++++++++++++++++++++++++++++++++++++++++++-- bloom.h | 1 + commit-graph.c | 5 +++ object.h | 1 + t/t4216-log-bloom.sh | 35 ++++++++++++++++- 5 files changed, 127 insertions(+), 5 deletions(-) diff --git a/bloom.c b/bloom.c index 739fa093ba..24dd874e46 100644 --- a/bloom.c +++ b/bloom.c @@ -7,6 +7,9 @@ #include "commit-graph.h" #include "commit.h" #include "commit-slab.h" +#include "tree.h" +#include "tree-walk.h" +#include "config.h" define_commit_slab(bloom_filter_slab, struct bloom_filter); @@ -250,6 +253,73 @@ static void init_truncated_large_filter(struct bloom_filter *filter, filter->version = version; } +#define VISITED (1u<<21) +#define HIGH_BITS (1u<<22) + +static int has_entries_with_high_bit(struct repository *r, struct tree *t) +{ + if (parse_tree(t)) + return 1; + + if (!(t->object.flags & VISITED)) { + struct tree_desc desc; + struct name_entry entry; + + init_tree_desc(&desc, t->buffer, t->size); + while (tree_entry(&desc, &entry)) { + size_t i; + for (i = 0; i < entry.pathlen; i++) { + if (entry.path[i] & 0x80) { + t->object.flags |= HIGH_BITS; + goto done; + } + } + + if (S_ISDIR(entry.mode)) { + struct tree *sub = lookup_tree(r, &entry.oid); + if (sub && has_entries_with_high_bit(r, sub)) { + t->object.flags |= HIGH_BITS; + goto done; + } + } + + } + +done: + t->object.flags |= VISITED; + } + + return !!(t->object.flags & HIGH_BITS); +} + +static int commit_tree_has_high_bit_paths(struct repository *r, + struct commit *c) +{ + struct tree *t; + if (repo_parse_commit(r, c)) + return 1; + t = repo_get_commit_tree(r, c); + if (!t) + return 1; + return has_entries_with_high_bit(r, t); +} + +static struct bloom_filter *upgrade_filter(struct repository *r, struct commit *c, + struct bloom_filter *filter, + int hash_version) +{ + struct commit_list *p = c->parents; + if (commit_tree_has_high_bit_paths(r, c)) + return NULL; + + if (p && commit_tree_has_high_bit_paths(r, p->item)) + return NULL; + + filter->version = hash_version; + + return filter; +} + struct bloom_filter *get_bloom_filter(struct repository *r, struct commit *c) { struct bloom_filter *filter; @@ -292,9 +362,23 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r, filter, graph_pos); } - if ((filter->data && filter->len) && - (!settings || settings->hash_version == filter->version)) - return filter; + if (filter->data && filter->len) { + struct bloom_filter *upgrade; + if (!settings || settings->hash_version == filter->version) + return filter; + + /* version mismatch, see if we can upgrade */ + if (compute_if_not_present && + git_env_bool("GIT_TEST_UPGRADE_BLOOM_FILTERS", 1)) { + upgrade = upgrade_filter(r, c, filter, + settings->hash_version); + if (upgrade) { + if (computed) + *computed |= BLOOM_UPGRADED; + return upgrade; + } + } + } if (!compute_if_not_present) return NULL; diff --git a/bloom.h b/bloom.h index bfe389e29c..e3a9b68905 100644 --- a/bloom.h +++ b/bloom.h @@ -102,6 +102,7 @@ enum bloom_filter_computed { BLOOM_COMPUTED = (1 << 1), BLOOM_TRUNC_LARGE = (1 << 2), BLOOM_TRUNC_EMPTY = (1 << 3), + BLOOM_UPGRADED = (1 << 4), }; struct bloom_filter *get_or_compute_bloom_filter(struct repository *r, diff --git a/commit-graph.c b/commit-graph.c index a8e33c0739..a3473df515 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -1045,6 +1045,7 @@ struct write_commit_graph_context { int count_bloom_filter_not_computed; int count_bloom_filter_trunc_empty; int count_bloom_filter_trunc_large; + int count_bloom_filter_upgraded; }; static int write_graph_chunk_fanout(struct hashfile *f, @@ -1651,6 +1652,8 @@ static void trace2_bloom_filter_write_statistics(struct write_commit_graph_conte ctx->count_bloom_filter_trunc_empty); trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large", ctx->count_bloom_filter_trunc_large); + trace2_data_intmax("commit-graph", ctx->r, "filter-upgraded", + ctx->count_bloom_filter_upgraded); } static void compute_bloom_filters(struct write_commit_graph_context *ctx) @@ -1692,6 +1695,8 @@ static void compute_bloom_filters(struct write_commit_graph_context *ctx) ctx->count_bloom_filter_trunc_empty++; if (computed & BLOOM_TRUNC_LARGE) ctx->count_bloom_filter_trunc_large++; + } else if (computed & BLOOM_UPGRADED) { + ctx->count_bloom_filter_upgraded++; } else if (computed & BLOOM_NOT_COMPUTED) ctx->count_bloom_filter_not_computed++; ctx->total_bloom_filter_data_size += filter diff --git a/object.h b/object.h index db25714b4e..2e5e08725f 100644 --- a/object.h +++ b/object.h @@ -75,6 +75,7 @@ void object_array_init(struct object_array *array); * commit-reach.c: 16-----19 * sha1-name.c: 20 * list-objects-filter.c: 21 + * bloom.c: 2122 * builtin/fsck.c: 0--3 * builtin/gc.c: 0 * builtin/index-pack.c: 2021 diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh index a77caca789..48f8109a66 100755 --- a/t/t4216-log-bloom.sh +++ b/t/t4216-log-bloom.sh @@ -217,6 +217,10 @@ test_filter_trunc_large () { grep "\"key\":\"filter-trunc-large\",\"value\":\"$1\"" $2 } +test_filter_upgraded () { + grep "\"key\":\"filter-upgraded\",\"value\":\"$1\"" $2 +} + test_expect_success 'correctly report changes over limit' ' git init limits && ( @@ -543,10 +547,19 @@ test_expect_success 'when writing another commit graph, preserve existing versio test_expect_success 'when writing commit graph, do not reuse changed-path of another version' ' git init doublewrite && test_commit -C doublewrite c "$CENT" && + git -C doublewrite config --add commitgraph.changedPathsVersion 1 && - git -C doublewrite commit-graph write --reachable --changed-paths && + GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \ + git -C doublewrite commit-graph write --reachable --changed-paths && + test_filter_computed 1 trace2.txt && + test_filter_upgraded 0 trace2.txt && + git -C doublewrite config --add commitgraph.changedPathsVersion 2 && - git -C doublewrite commit-graph write --reachable --changed-paths && + GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \ + git -C doublewrite commit-graph write --reachable --changed-paths && + test_filter_computed 1 trace2.txt && + test_filter_upgraded 0 trace2.txt && + ( cd doublewrite && echo "c01f" >expect && @@ -555,4 +568,22 @@ test_expect_success 'when writing commit graph, do not reuse changed-path of ano ) ' +test_expect_success 'when writing commit graph, reuse changed-path of another version where possible' ' + git init upgrade && + + test_commit -C upgrade base no-high-bits && + + git -C upgrade config --add commitgraph.changedPathsVersion 1 && + GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \ + git -C upgrade commit-graph write --reachable --changed-paths && + test_filter_computed 1 trace2.txt && + test_filter_upgraded 0 trace2.txt && + + git -C upgrade config --add commitgraph.changedPathsVersion 2 && + GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \ + git -C upgrade commit-graph write --reachable --changed-paths && + test_filter_computed 0 trace2.txt && + test_filter_upgraded 1 trace2.txt +' + test_done