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From: Derrick Stolee <stolee@gmail.com>
To: git@vger.kernel.org
Cc: git@jeffhostetler.com, stolee@gmail.com, gitster@pobox.com,
	Derrick Stolee <dstolee@microsoft.com>
Subject: [RFC PATCH 0/6] Use trace2 in commit-reach
Date: Thu,  6 Sep 2018 15:13:03 +0000	[thread overview]
Message-ID: <20180906151309.66712-1-dstolee@microsoft.com> (raw)
In-Reply-To: <2ba9d81a-5578-a81c-a7d9-179864cb4277@gmail.com>

As promised, here is the direction I took when applying the trace2
feature to the walking code in commit-reach.c. Hence, this depends
on Jeff's trace2 patches and ds/reachable.

There are multiple benefits to the approach I take here:

1. If a user has performance problems, we can rerun the command
   with tracing on and get the region enter/leave notifications
   and the extra data like "num_walked".

2. While I was testing this series against real-world examples,
   I found a number I didn't expect. The numbers for
   can_all_from_reach_with_flags were much higher than I expected.
   Turns out the heuristic I wrote was not working correctly. With
   the trace2 library, I was able to add a "run_and_check_trace2"
   function in test-lib.sh so I could make the number of walked
   commits be a condition we check in the test. Then, the benefit
   we expect is demonstrated by the test suite when I fix the
   bug.

Thanks,
-Stolee

P.S. I'm sending this RFC from gmail because I'm having SMTP issues
with my work email.

Derrick Stolee (6):
  commit-reach: add trace2 telemetry and walk count
  comit-reach: use trace2 for commit_contains_tag_algo
  commit-reach: use trace2 in can_all_from_reach
  test-tool: start trace2 environment
  test-lib: add run_and_check_trace2
  commit-reach: fix first-parent heuristic

 commit-reach.c        | 32 ++++++++++++++++++++++++++++++--
 t/helper/test-tool.c  |  3 +++
 t/t6600-test-reach.sh |  6 ++++++
 t/test-lib.sh         | 14 ++++++++++++++
 4 files changed, 53 insertions(+), 2 deletions(-)

-- 
2.19.0-rc2


  reply	other threads:[~2018-09-06 15:13 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-31 16:49 [PATCH 0/8] WIP: trace2: a new trace facility Jeff Hostetler via GitGitGadget
2018-08-31 16:49 ` [PATCH 1/8] trace2: create new combined " Jeff Hostetler via GitGitGadget
2018-08-31 17:19   ` Derrick Stolee
2018-09-04 22:12   ` Stefan Beller
2018-09-04 22:30     ` Junio C Hamano
2018-09-05 15:51       ` Jeff Hostetler
2018-09-05 15:01     ` Jeff Hostetler
2018-08-31 16:49 ` [PATCH 2/8] trace2: add trace2 to main Jeff Hostetler via GitGitGadget
2018-08-31 16:49 ` [PATCH 3/8] trace2: demonstrate trace2 regions in wt-status Jeff Hostetler via GitGitGadget
2018-08-31 16:49 ` [PATCH 4/8] trace2: demonstrate trace2 child process classification Jeff Hostetler via GitGitGadget
2018-08-31 16:50 ` [PATCH 5/8] trace2: demonstrate instrumenting do_read_index Jeff Hostetler via GitGitGadget
2018-08-31 16:50 ` [PATCH 6/8] trace2: demonstrate instrumenting threaded preload_index Jeff Hostetler via GitGitGadget
2018-08-31 16:50 ` [PATCH 7/8] trace2: demonstrate setting sub-command parameter in checkout Jeff Hostetler via GitGitGadget
2018-08-31 16:50 ` [PATCH 8/8] trace2: demonstrate use of regions in read_directory_recursive Jeff Hostetler via GitGitGadget
2018-08-31 17:19 ` [PATCH 0/8] WIP: trace2: a new trace facility Derrick Stolee
2018-09-06 15:13   ` Derrick Stolee [this message]
2018-09-06 15:13     ` [RFC PATCH 1/6] commit-reach: add trace2 telemetry and walk count Derrick Stolee
2018-09-06 15:13     ` [RFC PATCH 2/6] comit-reach: use trace2 for commit_contains_tag_algo Derrick Stolee
2018-09-06 15:13     ` [RFC PATCH 3/6] commit-reach: use trace2 in can_all_from_reach Derrick Stolee
2018-09-06 15:13     ` [RFC PATCH 4/6] test-tool: start trace2 environment Derrick Stolee
2018-09-06 15:13     ` [RFC PATCH 5/6] test-lib: add run_and_check_trace2 Derrick Stolee
2018-09-06 15:13     ` [RFC PATCH 6/6] commit-reach: fix first-parent heuristic Derrick Stolee
2018-10-11  1:50       ` Jonathan Nieder
2018-10-11 11:00         ` Derrick Stolee
2019-01-15  1:05 ` [PATCH 0/8] WIP: trace2: a new trace facility Jonathan Nieder
2019-01-15 17:03   ` Jeff Hostetler

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