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From: Jeff King <peff@peff.net>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Git ML <git@vger.kernel.org>,
	Derrick Stolee <dstolee@microsoft.com>,
	Taylor Blau <me@ttaylorr.com>,
	Jeff Hostetler <jeffhost@microsoft.com>
Subject: Re: t4216-log-bloom.sh fails with -v (but not --verbose-log)
Date: Thu, 25 Nov 2021 23:08:36 -0500	[thread overview]
Message-ID: <YaBdxL3QH1/GrWY1@coredump.intra.peff.net> (raw)
In-Reply-To: <211125.86pmqoifp8.gmgdl@evledraar.gmail.com>

On Thu, Nov 25, 2021 at 01:14:45PM +0100, Ævar Arnfjörð Bjarmason wrote:

> I haven't looked much into $subject, but there's an interesting
> regression in 2ca245f8be5 (csum-file.h: increase hashfile buffer size,
> 2021-05-18) where it fails with -v, but not --verbose-log. Discovered
> while running it manually.
> 
> This is a regression in v2.33.0 (not v2.34.0!), so nothing urgent, and
> this is pretty obscure anyway.
> 
> For the original change see:
> https://lore.kernel.org/git/64ffddd791160895b8e6730ebcddfac8458653f2.1621362768.git.gitgitgadget@gmail.com/

Interesting. This patch makes it go away (the "5" is cargo-culted from
earlier in the script):

diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
index 50f206db55..2f3a1cd210 100755
--- a/t/t4216-log-bloom.sh
+++ b/t/t4216-log-bloom.sh
@@ -231,6 +231,7 @@ test_expect_success 'correctly report changes over limit' '
 
 		# Commit has 7 file and 4 directory adds
 		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT_NESTING=5 \
 			GIT_TRACE2_EVENT="$(pwd)/trace" \
 			git commit-graph write --reachable --changed-paths &&
 		test_max_changed_paths 10 trace &&
@@ -263,6 +264,7 @@ test_expect_success 'correctly report changes over limit' '
 		# start from scratch and rebuild
 		rm -f .git/objects/info/commit-graph &&
 		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT_NESTING=5 \
 			GIT_TRACE2_EVENT="$(pwd)/trace-edit" \
 			git commit-graph write --reachable --changed-paths &&
 		test_max_changed_paths 10 trace-edit &&
@@ -280,6 +282,7 @@ test_expect_success 'correctly report changes over limit' '
 		# start from scratch and rebuild
 		rm -f .git/objects/info/commit-graph &&
 		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=11 \
+			GIT_TRACE2_EVENT_NESTING=5 \
 			GIT_TRACE2_EVENT="$(pwd)/trace-update" \
 			git commit-graph write --reachable --changed-paths &&
 		test_max_changed_paths 11 trace-update &&

The commit in question (2ca245f8be) puts the writing into a new trace2
region ("chunkfile"), so it makes sense that the nesting increases by
one. But what's interesting is that the nesting is different depending
on whether stderr is a terminal. I guess because the progress code
starts its own region.

The default nesting max for trace2 is 2. That seems kind of low given
this example, but I don't know enough about the tradeoffs to say what
bad things might happen if it's raised. But the above patch really seems
like a hack, and that this quiet omission would absolutely confuse real
users who are trying to use trace2 for debugging.

-Peff

  reply	other threads:[~2021-11-26  4:10 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 19:12 [PATCH 0/3] Convert index writes to use hashfile API Derrick Stolee via GitGitGadget
2021-03-26 19:12 ` [PATCH 1/3] csum-file: add nested_hashfile() Derrick Stolee via GitGitGadget
2021-03-26 19:12 ` [PATCH 2/3] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-03-29 15:04   ` Derrick Stolee
2021-03-29 19:10     ` Derrick Stolee
2021-03-26 19:12 ` [PATCH 3/3] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget
2021-03-26 20:16 ` [PATCH 0/3] Convert index writes to use hashfile API Derrick Stolee
2021-05-17 12:24 ` [PATCH v2 0/4] " Derrick Stolee via GitGitGadget
2021-05-17 12:24   ` [PATCH v2 1/4] hashfile: use write_in_full() Derrick Stolee via GitGitGadget
2021-05-17 12:24   ` [PATCH v2 2/4] csum-file.h: increase hashfile buffer size Derrick Stolee via GitGitGadget
2021-05-17 21:54     ` Junio C Hamano
2021-05-18  7:33       ` Jeff King
2021-05-18 14:44         ` Derrick Stolee
2021-05-18  7:31     ` Jeff King
2021-05-18  7:42       ` Jeff King
2021-05-17 12:24   ` [PATCH v2 3/4] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-05-17 22:13     ` Junio C Hamano
2021-05-18 14:16       ` Derrick Stolee
2021-05-17 12:24   ` [PATCH v2 4/4] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget
2021-05-18 18:32   ` [PATCH v3 0/4] Convert index writes to use hashfile API Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 1/4] hashfile: use write_in_full() Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 2/4] csum-file.h: increase hashfile buffer size Derrick Stolee via GitGitGadget
2021-11-25 12:14       ` t4216-log-bloom.sh fails with -v (but not --verbose-log) Ævar Arnfjörð Bjarmason
2021-11-26  4:08         ` Jeff King [this message]
2021-11-29 13:49           ` Derrick Stolee
2021-05-18 18:32     ` [PATCH v3 3/4] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 4/4] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget

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