From: Derrick Stolee <stolee@gmail.com>
To: Jeff King <peff@peff.net>,
Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, avarab@gmail.com, gitster@pobox.com,
me@ttaylorr.com, Derrick Stolee <derrickstolee@github.com>,
Jeff Hostetler <git@jeffhostetler.com>
Subject: Re: [PATCH 0/2] Set GIT_TRACE2_EVENT_NESTING in test-lib.sh
Date: Tue, 30 Nov 2021 10:34:03 -0500 [thread overview]
Message-ID: <86555f24-e7c4-64cb-a55c-7e2580e895f2@gmail.com> (raw)
In-Reply-To: <YaUegEGxfAf72O9Z@coredump.intra.peff.net>
On 11/29/2021 1:40 PM, Jeff King wrote:
> On Mon, Nov 29, 2021 at 01:47:44PM +0000, Derrick Stolee via GitGitGadget wrote:
>
>> As reported by Ævar [1] and diagnosed by Peff in a reply, the default
>> GIT_TRACE2_EVENT_NESTING is set so low that tests that look for trace2
>> events can start failing due to an added trace2 region. This can even be
>> subtle, including the fact that the progress API adds trace2 regions when in
>> use (which can depend on the verbose output of a test script).
>
> I think this is a good change for fixing the immediate problem of the
> test suite failing.
>
> But I have to wonder if this is masking a problem that real users will
> see. Aren't we silently discarding trace2 output that could be useful to
> somebody debugging or trying to get performance metrics?
>
> I.e., should we be bumping the internal nesting max of 2 to something
> higher? If that would that cause problems with existing metrics, should
> we be designing new metrics to avoid nesting?
One thing this makes me think about is that we might want to
have items such as trace2_data_intmax() and trace2_data_string()
not be subject to the nesting limit. Only have the nesting apply
to the regions (which nest).
CC'ing Jeff Hostetler for his thoughts on that idea. We will have
a discussion offline to see if the progress regions have started
to cause inconsistencies in our existing telemetry stream of
internal users.
Thanks,
-Stolee
next prev parent reply other threads:[~2021-11-30 15:34 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 13:47 [PATCH 0/2] Set GIT_TRACE2_EVENT_NESTING in test-lib.sh Derrick Stolee via GitGitGadget
2021-11-29 13:47 ` [PATCH 1/2] test-lib.sh: set GIT_TRACE2_EVENT_NESTING Derrick Stolee via GitGitGadget
2021-11-29 14:12 ` Ævar Arnfjörð Bjarmason
2021-11-29 18:28 ` Junio C Hamano
2021-11-29 18:32 ` Junio C Hamano
2021-11-29 13:47 ` [PATCH 2/2] t/t*: remove custom GIT_TRACE2_EVENT_NESTING Derrick Stolee via GitGitGadget
2021-11-29 18:40 ` [PATCH 0/2] Set GIT_TRACE2_EVENT_NESTING in test-lib.sh Jeff King
2021-11-29 18:44 ` Jeff King
2021-11-30 0:04 ` Taylor Blau
2021-11-30 15:34 ` Derrick Stolee [this message]
2021-11-30 22:43 ` Jeff Hostetler
2021-12-01 19:46 ` Jeff King
2021-11-29 20:13 ` [PATCH] test-lib.sh: have all tests pass under "-x", remove BASH_XTRACEFD Ævar Arnfjörð Bjarmason
2021-11-29 23:23 ` Eric Sunshine
2021-11-30 21:08 ` Jeff King
2021-11-30 21:50 ` Ævar Arnfjörð Bjarmason
2021-11-30 22:44 ` SZEDER Gábor
2021-12-01 14:06 ` Ævar Arnfjörð Bjarmason
2021-12-01 19:38 ` Jeff King
2021-12-01 18:38 ` Junio C Hamano
2021-12-01 20:11 ` [PATCH v2 0/2] " Ævar Arnfjörð Bjarmason
2021-12-01 20:11 ` [PATCH v2 1/2] t1510: remove need for "test_untraceable", retain coverage Ævar Arnfjörð Bjarmason
2021-12-02 19:16 ` SZEDER Gábor
2021-12-02 19:28 ` SZEDER Gábor
2021-12-10 9:47 ` Jeff King
2021-12-10 10:08 ` Ævar Arnfjörð Bjarmason
2022-02-06 21:40 ` SZEDER Gábor
2021-12-01 20:11 ` [PATCH v2 2/2] test-lib.sh: remove the now-unused "test_untraceable" facility Ævar Arnfjörð Bjarmason
2021-12-10 10:07 ` [PATCH v3 0/2] test-lib.sh: have all tests pass under "-x", remove BASH_XTRACEFD Ævar Arnfjörð Bjarmason
2021-12-10 10:07 ` [PATCH v3 1/2] t1510: remove need for "test_untraceable", retain coverage Ævar Arnfjörð Bjarmason
2021-12-10 10:07 ` [PATCH v3 2/2] test-lib.sh: remove the now-unused "test_untraceable" facility Ævar Arnfjörð Bjarmason
2021-12-12 16:32 ` SZEDER Gábor
2021-12-12 17:06 ` Ævar Arnfjörð Bjarmason
2021-12-12 20:14 ` SZEDER Gábor
2021-12-13 18:51 ` Junio C Hamano
2021-12-14 16:43 ` Jeff King
2021-12-15 17:05 ` Junio C Hamano
2021-12-15 17:17 ` Jeff King
2021-12-15 17:32 ` Junio C Hamano
2021-12-16 13:04 ` Ævar Arnfjörð Bjarmason
2021-12-13 1:38 ` [PATCH v4 0/3] test-lib.sh: have all tests pass under "-x", remove BASH_XTRACEFD Ævar Arnfjörð Bjarmason
2021-12-13 1:38 ` [PATCH v4 1/3] t1510: remove need for "test_untraceable", retain coverage Ævar Arnfjörð Bjarmason
2021-12-13 1:38 ` [PATCH v4 2/3] test-lib.sh: remove the now-unused "test_untraceable" facility Ævar Arnfjörð Bjarmason
2021-12-13 1:38 ` [PATCH v4 3/3] test-lib.sh: remove "BASH_XTRACEFD" Ævar Arnfjörð Bjarmason
2022-02-21 23:11 ` SZEDER Gábor
2022-02-22 15:14 ` Ævar Arnfjörð Bjarmason
2021-12-13 5:43 ` [PATCH v4 0/3] test-lib.sh: have all tests pass under "-x", remove BASH_XTRACEFD SZEDER Gábor
2022-02-21 19:52 ` Ævar Arnfjörð Bjarmason
2022-02-21 21:03 ` SZEDER Gábor
2022-02-21 22:41 ` Ævar Arnfjörð Bjarmason
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