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From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>,
	Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [PATCH v3 4/6] log: refactor "rev.pending" code in cmd_show()
Date: Thu, 04 Aug 2022 08:59:20 -0700	[thread overview]
Message-ID: <xmqqy1w46luv.fsf@gitster.g> (raw)
In-Reply-To: <220804.865yj8e93t.gmgdl@evledraar.gmail.com> (=?utf-8?B?IsOG?= =?utf-8?B?dmFyIEFybmZqw7Zyw7A=?= Bjarmason"'s message of "Thu, 04 Aug 2022 09:51:41 +0200")

Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:

> Yeah, I saw that. I took it as we should consider changing this more
> generally (e.g. with coccicheck etc.).

To make things easier in the future, for the record, I in general do
not suggest such a bulk rewrite for the sake of rewrite, whether
driven with Coccinelle or something else, and I did not in this
case.

> This was mentioned in one of the original threads about the memcpy()
> idiom, but IIRC there was some reason to think that it wasn't as widely
> supported, ...

I somehow thought that we had that stage too long ago; I recall we
spotted struct assignment in a patch post release and left it there
without reverting.

> ... or in any case we'd want to re-rest that the compilers we
> care about similarly optimize it.

Perhaps.  Using struct assignment only when we feel an urge to use
memcpy() in a new code (or in the postimage of a newly rewritten
code), instead of doing a bulk update, would give us a chance to
start small and vet the result with compilers of such a small scale
rewrite carefully to build confidence, hopefully?

Thanks.

  reply	other threads:[~2022-08-04 15:59 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-13 13:10 [PATCH 0/6] revisions API: fix more memory leaks Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 3/6] log: make the intent of cmd_show()'s "rev.pending" juggling clearer Ævar Arnfjörð Bjarmason
2022-07-18 14:51   ` Jeff King
2022-07-13 13:10 ` [PATCH 4/6] log: fix common "rev.pending" memory leak in "git show" Ævar Arnfjörð Bjarmason
2022-07-18 14:57   ` Jeff King
2022-07-18 15:08     ` Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-07-18 15:05   ` Jeff King
2022-07-13 13:10 ` [PATCH 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-07-18 15:11   ` Jeff King
2022-07-18 15:13     ` Ævar Arnfjörð Bjarmason
2022-07-18 15:45       ` Jeff King
2022-07-29  7:07         ` Ævar Arnfjörð Bjarmason
2022-07-29 18:03           ` Jeff King
2022-07-29 18:37             ` Jeff King
2022-07-29 18:52               ` Junio C Hamano
2022-07-29 19:04                 ` Jeff King
2022-07-18 15:14 ` [PATCH 0/6] revisions API: fix more memory leaks Jeff King
2022-07-29  8:31 ` [PATCH v2 " Ævar Arnfjörð Bjarmason
2022-07-29  8:31   ` [PATCH v2 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-07-29  8:31   ` [PATCH v2 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-07-30  5:22     ` Eric Sunshine
2022-07-29  8:31   ` [PATCH v2 3/6] log: make the intent of cmd_show()'s "rev.pending" juggling clearer Ævar Arnfjörð Bjarmason
2022-07-29 18:44     ` Junio C Hamano
2022-07-29  8:31   ` [PATCH v2 4/6] log: fix common "rev.pending" memory leak in "git show" Ævar Arnfjörð Bjarmason
2022-07-29 18:55     ` Jeff King
2022-07-29 19:07       ` Jeff King
2022-07-29 18:59     ` Jeff King
2022-07-29  8:31   ` [PATCH v2 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-07-29  8:31   ` [PATCH v2 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-07-29 19:00     ` Jeff King
2022-07-29 19:02   ` [PATCH v2 0/6] revisions API: fix more memory leaks Jeff King
2022-08-02 15:33   ` [PATCH v3 " Ævar Arnfjörð Bjarmason
2022-08-02 15:33     ` [PATCH v3 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-08-03 17:13       ` Junio C Hamano
2022-08-02 15:33     ` [PATCH v3 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-08-02 15:33     ` [PATCH v3 3/6] log: fix a memory leak in "git show <revision>..." Ævar Arnfjörð Bjarmason
2022-08-03 17:27       ` Jeff King
2022-08-03 17:29         ` Jeff King
2022-08-03 17:54       ` Junio C Hamano
2022-08-02 15:33     ` [PATCH v3 4/6] log: refactor "rev.pending" code in cmd_show() Ævar Arnfjörð Bjarmason
2022-08-03 17:32       ` Jeff King
2022-08-03 17:59       ` Junio C Hamano
2022-08-04  7:51         ` Ævar Arnfjörð Bjarmason
2022-08-04 15:59           ` Junio C Hamano [this message]
2022-08-05  9:01             ` Ævar Arnfjörð Bjarmason
2022-08-02 15:33     ` [PATCH v3 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-08-02 15:33     ` [PATCH v3 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-08-03 18:30       ` Junio C Hamano
2022-08-03 17:33     ` [PATCH v3 0/6] revisions API: fix more memory leaks Jeff King

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