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From: "René Scharfe" <l.s.r@web.de>
To: Derrick Stolee <stolee@gmail.com>,
	Junio C Hamano <gitster@pobox.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Michael Haggerty <mhagger@alum.mit.edu>,
	me@ttaylorr.com, peff@peff.net,
	Derrick Stolee <derrickstolee@github.com>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH 1/3] commit-reach: use one walk in remove_redundant()
Date: Sun, 31 Jan 2021 11:20:41 +0100	[thread overview]
Message-ID: <08de57da-1e6b-8efa-2b48-3a6657dde578@web.de> (raw)
In-Reply-To: <75225d59-877e-92ad-1370-632d40af71cf@gmail.com>

Am 31.01.21 um 04:52 schrieb Derrick Stolee:
> On 1/29/2021 12:11 PM, René Scharfe wrote:
>> Am 28.01.21 um 21:51 schrieb Junio C Hamano:
>>> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
>>>> +	/* clear marks */
>>>> +	for (i = 0; i < cnt; i++) {
>>>> +		struct commit_list *parents;
>>>> +		parents = array[i]->parents;
>>>> +
>>>> +		while (parents) {
>>>> +			clear_commit_marks(parents->item, STALE);
>>>> +			parents = parents->next;
>>>>  		}
>>
>> This loop clears STALE from the parents of both the non-stale and
>> stale entries.  OK.  Should it also clear it from the stale entries
>> themselves?
>
> clear_commit_marks() walks commits starting from the input commit
> (parents->item in this case) and clears the STALE bit as long as
> it is present. This way, the accumulated clear_commit_marks() will
> walk each commit only once _and_ will visit any of the commits from
> 'array' that received the STALE bit during the above walk.

OK, makes sense -- stale items are ancestors of non-stale items.  That
means you don't need to keep them around even for this cleanup loop and
clearing STALE from the parents of the first count_non_stale items
suffices, right?  In that case you don't need to duplicate the array.

René

  reply	other threads:[~2021-01-31 12:40 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-28 16:24 [PATCH 0/3] Speed up remove_redundant() Derrick Stolee via GitGitGadget
2021-01-28 16:24 ` [PATCH 1/3] commit-reach: use one walk in remove_redundant() Derrick Stolee via GitGitGadget
2021-01-28 20:51   ` Junio C Hamano
2021-01-29 17:11     ` René Scharfe
2021-01-31  3:52       ` Derrick Stolee
2021-01-31 10:20         ` René Scharfe [this message]
2021-01-31  3:59     ` Derrick Stolee
2021-01-31 20:13       ` Derrick Stolee
2021-01-31 20:25       ` Junio C Hamano
2021-02-01  3:55         ` Derrick Stolee
2021-01-29 17:10   ` René Scharfe
2021-01-28 16:24 ` [PATCH 2/3] commit-reach: move compare_commits_by_gen Derrick Stolee via GitGitGadget
2021-01-28 16:24 ` [PATCH 3/3] commit-reach: use heuristic in remove_redundant() Derrick Stolee via GitGitGadget
2021-01-28 20:20 ` [PATCH 0/3] Speed up remove_redundant() Junio C Hamano
2021-02-01 12:47 ` [PATCH v2 0/5] " Derrick Stolee via GitGitGadget
2021-02-01 12:47   ` [PATCH v2 1/5] commit-reach: reduce requirements for remove_redundant() Derrick Stolee via GitGitGadget
2021-02-01 19:51     ` Junio C Hamano
2021-02-01 12:47   ` [PATCH v2 2/5] commit-reach: use one walk in remove_redundant() Derrick Stolee via GitGitGadget
2021-02-01 16:12     ` René Scharfe.
2021-02-01 16:31       ` Derrick Stolee
2021-02-01 12:47   ` [PATCH v2 3/5] commit-reach: move compare_commits_by_gen Derrick Stolee via GitGitGadget
2021-02-01 12:47   ` [PATCH v2 4/5] commit-reach: use heuristic in remove_redundant() Derrick Stolee via GitGitGadget
2021-02-01 20:05     ` Junio C Hamano
2021-02-01 21:02       ` Derrick Stolee
2021-02-01 12:47   ` [PATCH v2 5/5] commit-reach: stale commits may prune generation further Derrick Stolee via GitGitGadget
2021-02-03 15:59     ` Taylor Blau
2021-02-01 15:48   ` [PATCH v2 0/5] Speed up remove_redundant() Derrick Stolee
2021-02-18 23:25     ` Junio C Hamano
2021-02-19 12:17       ` Derrick Stolee
2021-02-20  3:32         ` Junio C Hamano
2021-02-19 12:34   ` [PATCH v3 " Derrick Stolee via GitGitGadget
2021-02-19 12:34     ` [PATCH v3 1/5] commit-reach: reduce requirements for remove_redundant() Derrick Stolee via GitGitGadget
2021-02-19 12:34     ` [PATCH v3 2/5] commit-reach: use one walk in remove_redundant() Derrick Stolee via GitGitGadget
2021-02-19 12:34     ` [PATCH v3 3/5] commit-reach: move compare_commits_by_gen Derrick Stolee via GitGitGadget
2021-02-19 12:34     ` [PATCH v3 4/5] commit-reach: use heuristic in remove_redundant() Derrick Stolee via GitGitGadget
2021-02-19 12:34     ` [PATCH v3 5/5] commit-reach: stale commits may prune generation further Derrick Stolee via GitGitGadget

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