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From: Junio C Hamano <gitster@pobox.com>
To: Jakub Narebski <jnareb@gmail.com>
Cc: "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Jeff King <peff@peff.net>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v4 4/7] revision.c: begin refactoring --topo-order logic
Date: Mon, 22 Oct 2018 10:12:10 +0900	[thread overview]
Message-ID: <xmqqa7n6zswl.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <86h8hfguqc.fsf@gmail.com> (Jakub Narebski's message of "Sun, 21 Oct 2018 17:55:23 +0200")

Jakub Narebski <jnareb@gmail.com> writes:

> So if revs->limited is set (but not because revs->topo_order is set),
> which means A..B queries, we will be still using the old algorithm.
> All right, though I wonder if it could be improved in the future
> (perhaps with the help of other graph labelling / indices than
> generation numbers, maybe a positive-cut index).
>
> Do you have an idea why there is no improvement with the new code in
> this case?

I didn't get the impression that it would not be possible to improve
the "--topo A..B" case by using generation numbers from this series.
Isn't it just because the necessary code has not been written yet?
In addition to what is needed for "--topo P1 P2 P3..." (all
positive), limited walk needs to notice the bottom boundary and stop
traversal.  Having generation numbers would make it slightly easier
than without, as you know that a positive commit you have will not
be marked UNINTERESTING due to a negative commit whose ancestors
have not been explored, as long as that negative commit has a higher
generation number.  But you still need to adjust the traversal logic
to properly terminate upon hitting UNINTERESTING one, and also
propagate the bit down the history, which is not needed at all if
you only want to support the "positive only" case.


  reply	other threads:[~2018-10-22  1:12 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-27 20:41 [PATCH 0/6] Use generation numbers for --topo-order Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 1/6] prio-queue: add 'peek' operation Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 2/6] test-reach: add run_three_modes method Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 3/6] test-reach: add rev-list tests Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 4/6] revision.c: begin refactoring --topo-order logic Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 5/6] commit/revisions: bookkeeping before refactoring Derrick Stolee via GitGitGadget
2018-08-27 20:41 ` [PATCH 6/6] revision.c: refactor basic topo-order logic Derrick Stolee via GitGitGadget
2018-08-27 21:23 ` [PATCH 0/6] Use generation numbers for --topo-order Junio C Hamano
2018-09-18  4:08 ` [PATCH v2 " Derrick Stolee via GitGitGadget
2018-09-18  4:08   ` [PATCH v2 1/6] prio-queue: add 'peek' operation Derrick Stolee via GitGitGadget
2018-09-18  4:08   ` [PATCH v2 2/6] test-reach: add run_three_modes method Derrick Stolee via GitGitGadget
2018-09-18 18:02     ` SZEDER Gábor
2018-09-19 19:31       ` Junio C Hamano
2018-09-19 19:38         ` Junio C Hamano
2018-09-20 21:18           ` Junio C Hamano
2018-09-18  4:08   ` [PATCH v2 3/6] test-reach: add rev-list tests Derrick Stolee via GitGitGadget
2018-09-18  4:08   ` [PATCH v2 4/6] revision.c: begin refactoring --topo-order logic Derrick Stolee via GitGitGadget
2018-09-18  4:08   ` [PATCH v2 5/6] commit/revisions: bookkeeping before refactoring Derrick Stolee via GitGitGadget
2018-09-18  4:08   ` [PATCH v2 6/6] revision.c: refactor basic topo-order logic Derrick Stolee via GitGitGadget
2018-09-18  5:51     ` Ævar Arnfjörð Bjarmason
2018-09-18  6:05   ` [PATCH v2 0/6] Use generation numbers for --topo-order Ævar Arnfjörð Bjarmason
2018-09-21 15:47     ` Derrick Stolee
2018-09-21 17:39   ` [PATCH v3 0/7] " Derrick Stolee via GitGitGadget
2018-09-21 17:39     ` [PATCH v3 1/7] prio-queue: add 'peek' operation Derrick Stolee via GitGitGadget
2018-09-26 19:15       ` Derrick Stolee
2018-10-11 13:54       ` Jeff King
2018-09-21 17:39     ` [PATCH v3 2/7] test-reach: add run_three_modes method Derrick Stolee via GitGitGadget
2018-10-11 13:57       ` Jeff King
2018-09-21 17:39     ` [PATCH v3 3/7] test-reach: add rev-list tests Derrick Stolee via GitGitGadget
2018-10-11 13:58       ` Jeff King
2018-10-12  4:34         ` Junio C Hamano
2018-09-21 17:39     ` [PATCH v3 4/7] revision.c: begin refactoring --topo-order logic Derrick Stolee via GitGitGadget
2018-10-11 14:06       ` Jeff King
2018-10-12  6:33       ` Junio C Hamano
2018-10-12 12:32         ` Derrick Stolee
2018-10-12 16:15         ` Johannes Sixt
2018-10-13  8:05           ` Junio C Hamano
2018-09-21 17:39     ` [PATCH v3 5/7] commit/revisions: bookkeeping before refactoring Derrick Stolee via GitGitGadget
2018-10-11 14:21       ` Jeff King
2018-09-21 17:39     ` [PATCH v3 6/7] revision.h: add whitespace in flag definitions Derrick Stolee via GitGitGadget
2018-09-21 17:39     ` [PATCH v3 7/7] revision.c: refactor basic topo-order logic Derrick Stolee via GitGitGadget
2018-09-27 17:57       ` Derrick Stolee
2018-10-06 16:56         ` Jakub Narebski
2018-10-11 15:35       ` Jeff King
2018-10-11 16:21         ` Derrick Stolee
2018-10-25  9:43           ` Jeff King
2018-10-25 13:00             ` Derrick Stolee
2018-10-11 22:32       ` Stefan Beller
2018-09-21 21:22     ` [PATCH v3 0/7] Use generation numbers for --topo-order Junio C Hamano
2018-10-16 22:36     ` [PATCH v4 " Derrick Stolee via GitGitGadget
2018-10-16 22:36       ` [PATCH v4 1/7] prio-queue: add 'peek' operation Derrick Stolee via GitGitGadget
2018-10-16 22:36       ` [PATCH v4 2/7] test-reach: add run_three_modes method Derrick Stolee via GitGitGadget
2018-10-16 22:36       ` [PATCH v4 3/7] test-reach: add rev-list tests Derrick Stolee via GitGitGadget
2018-10-21 10:21         ` Jakub Narebski
2018-10-21 15:28           ` Derrick Stolee
2018-10-16 22:36       ` [PATCH v4 4/7] revision.c: begin refactoring --topo-order logic Derrick Stolee via GitGitGadget
2018-10-21 15:55         ` Jakub Narebski
2018-10-22  1:12           ` Junio C Hamano [this message]
2018-10-22  1:51             ` Derrick Stolee
2018-10-22  1:55               ` [RFC PATCH] revision.c: use new algorithm in A..B case Derrick Stolee
2018-10-25  8:28               ` [PATCH v4 4/7] revision.c: begin refactoring --topo-order logic Junio C Hamano
2018-10-26 20:56                 ` Jakub Narebski
2018-10-16 22:36       ` [PATCH v4 5/7] commit/revisions: bookkeeping before refactoring Derrick Stolee via GitGitGadget
2018-10-21 21:17         ` Jakub Narebski
2018-10-16 22:36       ` [PATCH v4 6/7] revision.c: generation-based topo-order algorithm Derrick Stolee via GitGitGadget
2018-10-22 13:37         ` Jakub Narebski
2018-10-23 13:54           ` Derrick Stolee
2018-10-26 16:55             ` Jakub Narebski
2018-10-16 22:36       ` [PATCH v4 7/7] t6012: make rev-list tests more interesting Derrick Stolee via GitGitGadget
2018-10-23 15:48         ` Jakub Narebski
2018-10-21 12:57       ` [PATCH v4 0/7] Use generation numbers for --topo-order Jakub Narebski
2018-11-01  5:21       ` Junio C Hamano
2018-11-01 13:49         ` Derrick Stolee
2018-11-01 23:54           ` Junio C Hamano
2018-11-01 13:46       ` [PATCH v5 " Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 1/7] prio-queue: add 'peek' operation Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 2/7] test-reach: add run_three_modes method Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 3/7] test-reach: add rev-list tests Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 4/7] revision.c: begin refactoring --topo-order logic Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 5/7] commit/revisions: bookkeeping before refactoring Derrick Stolee
2018-11-01 13:46         ` [PATCH v5 6/7] revision.c: generation-based topo-order algorithm Derrick Stolee
2018-11-01 15:48           ` SZEDER Gábor
2018-11-01 16:12             ` Derrick Stolee
2019-11-08  2:50           ` Mike Hommey
2019-11-11  1:07             ` Derrick Stolee
2019-11-18 23:04               ` SZEDER Gábor
2018-11-01 13:46         ` [PATCH v5 7/7] t6012: make rev-list tests more interesting Derrick Stolee

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