From: Derrick Stolee <stolee@gmail.com>
To: "René Scharfe" <l.s.r@web.de>,
"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: Sat, 30 Jan 2021 22:52:59 -0500 [thread overview]
Message-ID: <75225d59-877e-92ad-1370-632d40af71cf@gmail.com> (raw)
In-Reply-To: <198f7766-190d-d361-d6f4-23adefedaf6c@web.de>
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:
>>> + /* rearrange array */
>>> + dup = xcalloc(cnt, sizeof(struct commit *));
>>> + COPY_ARRAY(dup, array, cnt);
>>> + for (i = 0; i < cnt; i++) {
>>> + if (dup[i]->object.flags & STALE) {
>>> + int insert = cnt - 1 - (i - count_non_stale);
>>> + array[insert] = dup[i];
>>> + } else {
>>> + array[count_non_stale] = dup[i];
>>> + count_non_stale++;
>>> + }
>>> + }
>>> + free(dup);
>>
>> The "fill stale ones from the end, non-stale ones from the
>> beginning" in the loop looks unnecessarily complex to me. I wonder
>> if we can do only the "fill non-stale ones from the beginning" half,
>> i.e.
>>
>> for (i = count_non_stale = 0; i < cnt; i++) {
>> if (dup[i] is not stale)
>> array[count_non_stale++] = dup[i];
>> }
>>
>> without the "keep the stale one at the end of array[]", and clear
>> marks using what is in dup[] as starting points before discarding
>> dup[]?
>>
>> Or do the callers still look at the entries beyond count_non_stale?
>
> Had the same reaction. Both callers ignore the stale entries.
Ok, I can update that logic accordingly. I wanted to keep consistent
with the comment at the start of the method:
/*
* Some commit in the array may be an ancestor of
* another commit. Move such commit to the end of
* the array, and return the number of commits that
* are independent from each other.
*/
but if no caller actually needs that, then I can remove this
behavior. Anyone mind if it is a follow-up patch to change this
part of the behavior?
>> Other than that, nicely done.
>>
>>> + /* 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.
Thanks,
-Stolee
next prev parent reply other threads:[~2021-01-31 3:53 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 [this message]
2021-01-31 10:20 ` René Scharfe
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=75225d59-877e-92ad-1370-632d40af71cf@gmail.com \
--to=stolee@gmail.com \
--cc=derrickstolee@github.com \
--cc=dstolee@microsoft.com \
--cc=git@vger.kernel.org \
--cc=gitgitgadget@gmail.com \
--cc=gitster@pobox.com \
--cc=l.s.r@web.de \
--cc=me@ttaylorr.com \
--cc=mhagger@alum.mit.edu \
--cc=peff@peff.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).