From: Jeff King <peff@peff.net>
To: "Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 00/12] Die commit->util, die!
Date: Sat, 12 May 2018 05:41:06 -0400 [thread overview]
Message-ID: <20180512094105.GH28279@sigill.intra.peff.net> (raw)
In-Reply-To: <20180512080028.29611-1-pclouds@gmail.com>
On Sat, May 12, 2018 at 10:00:16AM +0200, Nguyễn Thái Ngọc Duy wrote:
> There's not much to write here. It's basically a copy from 12/12:
>
> This 'util' pointer can be used for many different purposes,
> controlled in different ways. Some are not even contained in a command
> code, but buried deep in common code with no clue who will use it and
> how. For example, if revs.show_source is set, then it's used for
> storing path name, but if you happen to call get_merge_parent() then
> some 'util' may end up storing another thing.
>
> The move to using commit-slab gives us a much better picture of how
> some piece of data is associated with a commit and what for. Since
> nobody uses 'util' pointer anymore, we can retire it so that nobody will
> abuse it again. commit-slab will be the way forward for associating
> data to a commit.
>
> As a side benefit, this shrinks struct commit by 8 bytes (on 64-bit
> architecture) which should help reduce memory usage for reachability
> test a bit. This is also what commit-slab is invented for [1].
I left a few comments, but overall this looks pretty good. A few of the
conversions get tricky with the number of pointer dereferences, but most
of those were pretty tricky to begin with (that weight stuff in
bisect.c...yikes!).
I love the result. More maintainable code, less possibility of conflicts
in the util field, and a memory savings to boot.
-Peff
next prev parent reply other threads:[~2018-05-12 9:41 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-12 8:00 [PATCH 00/12] Die commit->util, die! Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 01/12] blame: use commit-slab for blame suspects instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-12 9:22 ` Jeff King
2018-05-12 12:13 ` Duy Nguyen
2018-05-12 8:00 ` [PATCH 02/12] describe: use commit-slab for commit names " Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 03/12] shallow.c: use commit-slab for commit depth " Nguyễn Thái Ngọc Duy
2018-05-12 9:07 ` Jeff King
2018-05-12 9:18 ` Jeff King
2018-05-12 12:09 ` Duy Nguyen
2018-05-12 19:12 ` Jeff King
2018-05-12 11:59 ` Duy Nguyen
2018-05-12 8:00 ` [PATCH 04/12] sequencer.c: use commit-slab to mark seen commits Nguyễn Thái Ngọc Duy
2018-05-12 9:25 ` Jeff King
2018-05-12 13:43 ` Junio C Hamano
2018-05-12 14:00 ` Duy Nguyen
2018-05-12 8:00 ` [PATCH 05/12] sequencer.c: use commit-slab to associate todo items to commits Nguyễn Thái Ngọc Duy
2018-05-12 9:28 ` Jeff King
2018-05-12 8:00 ` [PATCH 06/12] revision.c: use commit-slab for show_source Nguyễn Thái Ngọc Duy
2018-05-12 9:33 ` Jeff King
2018-05-12 13:58 ` Junio C Hamano
2018-05-12 14:13 ` Duy Nguyen
2018-05-12 19:06 ` Jeff King
2018-05-12 8:00 ` [PATCH 07/12] bisect.c: use commit-slab for commit weight instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-12 13:59 ` Junio C Hamano
2018-05-12 8:00 ` [PATCH 08/12] name-rev: use commit-slab for rev-name " Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 09/12] show-branch: use commit-slab for commit-name " Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 10/12] log: use commit-slab in prepare_bases() " Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 11/12] merge: use commit-slab in merge remote desc " Nguyễn Thái Ngọc Duy
2018-05-12 8:00 ` [PATCH 12/12] commit.h: delete 'util' field in struct commit Nguyễn Thái Ngọc Duy
2018-05-12 9:41 ` Jeff King [this message]
2018-05-12 18:50 ` [PATCH 00/12] Die commit->util, die! Jakub Narebski
2018-05-13 5:39 ` Duy Nguyen
2018-05-13 5:51 ` [PATCH v2 00/14] " Nguyễn Thái Ngọc Duy
2018-05-13 5:51 ` [PATCH v2 01/14] commit-slab.h: code split Nguyễn Thái Ngọc Duy
2018-05-13 23:33 ` Junio C Hamano
2018-05-13 5:51 ` [PATCH v2 02/14] commit-slab: support shared commit-slab Nguyễn Thái Ngọc Duy
2018-05-13 23:36 ` Junio C Hamano
2018-05-13 5:51 ` [PATCH v2 03/14] blame: use commit-slab for blame suspects instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-13 23:42 ` Junio C Hamano
2018-05-13 5:51 ` [PATCH v2 04/14] describe: use commit-slab for commit names " Nguyễn Thái Ngọc Duy
2018-05-13 23:45 ` Junio C Hamano
2018-05-13 5:51 ` [PATCH v2 05/14] shallow.c: use commit-slab for commit depth " Nguyễn Thái Ngọc Duy
2018-05-13 5:52 ` [PATCH v2 06/14] sequencer.c: use commit-slab to mark seen commits Nguyễn Thái Ngọc Duy
2018-05-14 4:17 ` Junio C Hamano
2018-05-13 5:52 ` [PATCH v2 07/14] sequencer.c: use commit-slab to associate todo items to commits Nguyễn Thái Ngọc Duy
2018-05-13 5:52 ` [PATCH v2 08/14] revision.c: use commit-slab for show_source Nguyễn Thái Ngọc Duy
2018-05-14 5:10 ` Junio C Hamano
2018-05-14 5:37 ` Junio C Hamano
2018-05-13 5:52 ` [PATCH v2 09/14] bisect.c: use commit-slab for commit weight instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-14 6:16 ` Junio C Hamano
2018-05-13 5:52 ` [PATCH v2 10/14] name-rev: use commit-slab for rev-name " Nguyễn Thái Ngọc Duy
2018-05-13 5:52 ` [PATCH v2 11/14] show-branch: use commit-slab for commit-name " Nguyễn Thái Ngọc Duy
2018-05-14 6:45 ` Junio C Hamano
2018-05-19 4:51 ` Duy Nguyen
2018-05-13 5:52 ` [PATCH v2 12/14] log: use commit-slab in prepare_bases() " Nguyễn Thái Ngọc Duy
2018-05-13 5:52 ` [PATCH v2 13/14] merge: use commit-slab in merge remote desc " Nguyễn Thái Ngọc Duy
2018-05-18 2:16 ` Junio C Hamano
2018-05-18 17:54 ` Ramsay Jones
2018-05-13 5:52 ` [PATCH v2 14/14] commit.h: delete 'util' field in struct commit Nguyễn Thái Ngọc Duy
2018-05-14 7:52 ` Junio C Hamano
2018-05-14 16:07 ` Duy Nguyen
2018-05-14 17:30 ` Duy Nguyen
2018-05-14 18:14 ` Derrick Stolee
2018-05-19 5:41 ` Duy Nguyen
2018-05-19 5:28 ` [PATCH v3 00/15] Die commit->util, die! Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 01/15] commit-slab.h: code split Nguyễn Thái Ngọc Duy
2018-05-21 5:11 ` Junio C Hamano
2018-05-19 5:28 ` [PATCH v3 02/15] commit-slab: support shared commit-slab Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 03/15] blame: use commit-slab for blame suspects instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 04/15] describe: use commit-slab for commit names " Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 05/15] shallow.c: use commit-slab for commit depth " Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 06/15] sequencer.c: use commit-slab to mark seen commits Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 07/15] sequencer.c: use commit-slab to associate todo items to commits Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 08/15] revision.c: use commit-slab for show_source Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 09/15] bisect.c: use commit-slab for commit weight instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 10/15] name-rev: use commit-slab for rev-name " Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 11/15] show-branch: use commit-slab for commit-name " Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 12/15] show-branch: note about its object flags usage Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 13/15] log: use commit-slab in prepare_bases() instead of commit->util Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 14/15] merge: use commit-slab in merge remote desc " Nguyễn Thái Ngọc Duy
2018-05-19 5:28 ` [PATCH v3 15/15] commit.h: delete 'util' field in struct commit Nguyễn Thái Ngọc Duy
2018-05-22 22:40 ` [PATCH 00/12] Die commit->util, die! Stefan Beller
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