From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, me@ttaylorr.com, gitster@pobox.com,
abhishekkumar8222@gmail.com,
Derrick Stolee <derrickstolee@github.com>
Subject: Re: [PATCH v2 2/4] commit-graph: fix ordering bug in generation numbers
Date: Mon, 28 Feb 2022 16:25:06 +0100 [thread overview]
Message-ID: <220228.86h78j3t67.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <cbcbf10e6994d469abc5463d08165e6a2ba73153.1646056423.git.gitgitgadget@gmail.com>
On Mon, Feb 28 2022, Derrick Stolee via GitGitGadget wrote:
> From: Derrick Stolee <derrickstolee@github.com>
> [...]
> diff --git a/commit-graph.c b/commit-graph.c
> index 265c010122e..a19bd96c2ee 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -1556,12 +1556,16 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
> if (current->date && current->date > max_corrected_commit_date)
> max_corrected_commit_date = current->date - 1;
> commit_graph_data_at(current)->generation = max_corrected_commit_date + 1;
> -
> - if (commit_graph_data_at(current)->generation - current->date > GENERATION_NUMBER_V2_OFFSET_MAX)
> - ctx->num_generation_data_overflows++;
> }
> }
> }
> +
> + for (i = 0; i < ctx->commits.nr; i++) {
> + struct commit *c = ctx->commits.list[i];
> + timestamp_t offset = commit_graph_data_at(c)->generation - c->date;
> + if (offset > GENERATION_NUMBER_V2_OFFSET_MAX)
> + ctx->num_generation_data_overflows++;
> + }
> stop_progress(&ctx->progress);
> }
>
> diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
> index 2b05026cf6d..f9bffe38013 100755
> --- a/t/t5318-commit-graph.sh
> +++ b/t/t5318-commit-graph.sh
> @@ -467,10 +467,10 @@ test_expect_success 'warn on improper hash version' '
> )
> '
>
> -test_expect_success 'lower layers have overflow chunk' '
> +test_expect_success TIME_IS_64BIT,TIME_T_IS_64BIT 'lower layers have overflow chunk' '
> cd "$TRASH_DIRECTORY/full" &&
> UNIX_EPOCH_ZERO="@0 +0000" &&
> - FUTURE_DATE="@2147483646 +0000" &&
> + FUTURE_DATE="@4147483646 +0000" &&
> rm -f .git/objects/info/commit-graph &&
> test_commit --date "$FUTURE_DATE" future-1 &&
> test_commit --date "$UNIX_EPOCH_ZERO" old-1 &&
Isn't it worth splitting up this test instead, so that we can test cases
where 32 bit timestamps overflow without these new prereqs.
Unless I'm missing something that would just be a matter of splitting
this test into helper that takes that $FUTURE_DATE as an argument, then
running it for both timestamps, with TIME_IS_64BIT,TIME_T_IS_64BIT on
the 64 bit one.
Or maybe I don't get it, but it seems like we're throwing out some
carefully considered testing for 32 bit compatibility with the
proverbial bath water here....
Aside from that I wonder how this interacts with both:
#define CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW (1ULL << 31)
And this existing code, where offset is timestamp_t, but
num_generation_data_overflows is an "int":
offset = CORRECTED_COMMIT_DATE_OFFSET_OVERFLOW | num_generation_data_overflows;
That proooobably does the right thing if int is say 32 bit, but
timestamp_t is 64 bit (does such an OS exist?), but maybe worth looking
at with a second pair of eyes...
next prev parent reply other threads:[~2022-02-28 15:30 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-24 20:38 [PATCH 0/7] Commit-graph: Generation Number v2 Fixes, v3 implementation Derrick Stolee via GitGitGadget
2022-02-24 20:38 ` [PATCH 1/7] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-02-24 20:38 ` [PATCH 2/7] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-02-24 22:15 ` Junio C Hamano
2022-02-25 13:51 ` Derrick Stolee
2022-02-25 17:35 ` Junio C Hamano
2022-02-24 20:38 ` [PATCH 3/7] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-02-28 15:18 ` Patrick Steinhardt
2022-02-28 16:23 ` Derrick Stolee
2022-02-28 16:59 ` Patrick Steinhardt
2022-02-28 18:44 ` Derrick Stolee
2022-03-01 9:46 ` Patrick Steinhardt
2022-03-01 10:35 ` Patrick Steinhardt
2022-03-01 14:06 ` Derrick Stolee
2022-03-01 14:53 ` Patrick Steinhardt
2022-03-01 15:25 ` Derrick Stolee
2022-03-02 13:57 ` Patrick Steinhardt
2022-03-02 14:57 ` Derrick Stolee
2022-03-02 18:15 ` Junio C Hamano
2022-03-02 18:46 ` Derrick Stolee
2022-03-02 22:42 ` Junio C Hamano
2022-03-03 11:19 ` Patrick Steinhardt
2022-03-03 16:00 ` Derrick Stolee
2022-03-04 14:03 ` Derrick Stolee
2022-03-07 10:34 ` Patrick Steinhardt
2022-03-07 13:45 ` Derrick Stolee
2022-03-07 17:22 ` Junio C Hamano
2022-03-10 13:58 ` Patrick Steinhardt
2022-03-10 17:18 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 4/7] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
2022-02-24 22:35 ` Junio C Hamano
2022-02-25 13:53 ` Derrick Stolee
2022-02-25 17:38 ` Junio C Hamano
2022-02-24 20:38 ` [PATCH 5/7] commit-graph: document file format v2 Derrick Stolee via GitGitGadget
2022-02-24 22:55 ` Junio C Hamano
2022-02-25 22:31 ` Ævar Arnfjörð Bjarmason
2022-02-28 13:44 ` Derrick Stolee
2022-02-28 14:27 ` Ævar Arnfjörð Bjarmason
2022-02-28 16:39 ` Derrick Stolee
2022-02-28 21:14 ` Ævar Arnfjörð Bjarmason
2022-03-01 14:19 ` Derrick Stolee
2022-03-01 14:29 ` Ævar Arnfjörð Bjarmason
2022-03-01 15:59 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 6/7] commit-graph: parse " Derrick Stolee via GitGitGadget
2022-02-24 23:01 ` Junio C Hamano
2022-02-25 13:54 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 7/7] commit-graph: write " Derrick Stolee via GitGitGadget
2022-02-24 21:42 ` [PATCH 0/7] Commit-graph: Generation Number v2 Fixes, v3 implementation Junio C Hamano
2022-02-24 23:06 ` Junio C Hamano
2022-02-25 13:55 ` Derrick Stolee
2022-02-28 13:53 ` [PATCH v2 0/4] Commit-graph: Generation Number v2 Fixes Derrick Stolee via GitGitGadget
2022-02-28 13:53 ` [PATCH v2 1/4] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-02-28 15:22 ` Ævar Arnfjörð Bjarmason
2022-02-28 13:53 ` [PATCH v2 2/4] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-02-28 15:25 ` Ævar Arnfjörð Bjarmason [this message]
2022-02-28 13:53 ` [PATCH v2 3/4] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-02-28 15:30 ` Ævar Arnfjörð Bjarmason
2022-02-28 16:43 ` Derrick Stolee
2022-02-28 13:53 ` [PATCH v2 4/4] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
2022-02-28 15:40 ` Ævar Arnfjörð Bjarmason
2022-03-01 17:23 ` [PATCH v2 0/4] Commit-graph: Generation Number v2 Fixes Ævar Arnfjörð Bjarmason
2022-03-01 19:48 ` [PATCH v3 0/5] " Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 1/5] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 2/5] t5318: extract helpers to lib-commit-graph.sh Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 3/5] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-03-01 20:13 ` Junio C Hamano
2022-03-01 20:30 ` Junio C Hamano
2022-03-02 14:13 ` Derrick Stolee
2022-03-01 19:48 ` [PATCH v3 4/5] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 5/5] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
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