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From: Elijah Newren <newren@gmail.com>
To: Git Mailing List <git@vger.kernel.org>
Cc: "brian m. carlson" <sandals@crustytoothpaste.net>,
	Edward Thomson <ethomson@edwardthomson.com>,
	Jeff King <peff@peff.net>
Subject: Re: [PATCH 00/20] fundamentals of merge-ort implementation
Date: Thu, 29 Oct 2020 20:58:01 -0700	[thread overview]
Message-ID: <CABPp-BHKGkx04neULtYUyfiU+z-X7_rxQqriSEjxZjU1oXokOA@mail.gmail.com> (raw)
In-Reply-To: <20201030034131.1479968-1-newren@gmail.com>

On Thu, Oct 29, 2020 at 8:41 PM Elijah Newren <newren@gmail.com> wrote:
>
> ...
> The goal of this series is to show the new design and structure behind
> merge-ort, particularly the bits that are completely different to how
> merge-recursive operates....
>
> At a high level, merge-ort avoids unpack_trees() and the index, instead
> using traverse_trees() and its own data structure.  After it is done
> processing each path, it writes a tree.  Only after it has created a new
> tree will it touch the working copy or the index.  It does so by using a
> simple checkout-like step to switch from head to the newly created tree.
> If there are unmerged entries, it touches up the index after the
> checkout-like step to record those higher order stages.

While I didn't think anyone needed to be cc'ed on the whole series,
but I made some promises at Git Merge 2020 to give some heads up:

* Brian: Patches 13-15 create tree objects, joining other places in
the code such as fast-import, mktree, cache-tree, and notes that write
tree objects.  You mentioned something about consolidating these for
sha256 handling.
* Edward: You wanted a heads up when I started submitting the ort
merge backend.  Here it is.  It doesn't change any on-disk data
structures now or later, though, so I'm not sure libgit2 really is
affected.
* Peff: This isn't a Git Merge 2020 thing, but here's a series that
starts depending on strmap.  I'm happy to update and rebase if needed,
but opinions on strmap to prevent us from any API poisoning and such
would be great.  :-)

Elijah

> In the series:
>   * Patch 1 adds some basic data structures.
>   * Patch 2 documents the high-level steps.
>   * Patches 3-5 are some simple setup.
>   * Patches 6-10 collect data from the traverse_trees() operation.
>   * Patches 11-15 process the individual paths and create a tree.
>   * Patches 16-19 handle checkout-and-then-write-higher-order-stages.
>   * Patch 20 frees data from the merge_options_internal data structure
>
> Elijah Newren (20):
>   merge-ort: setup basic internal data structures
>   merge-ort: add some high-level algorithm structure
>   merge-ort: port merge_start() from merge-recursive
>   merge-ort: use histogram diff
>   merge-ort: add an err() function similar to one from merge-recursive
>   merge-ort: implement a very basic collect_merge_info()
>   merge-ort: avoid repeating fill_tree_descriptor() on the same tree
>   merge-ort: compute a few more useful fields for collect_merge_info
>   merge-ort: record stage and auxiliary info for every path
>   merge-ort: avoid recursing into identical trees
>   merge-ort: add a preliminary simple process_entries() implementation
>   merge-ort: have process_entries operate in a defined order
>   merge-ort: step 1 of tree writing -- record basenames, modes, and oids
>   merge-ort: step 2 of tree writing -- function to create tree object
>   merge-ort: step 3 of tree writing -- handling subdirectories as we go
>   merge-ort: basic outline for merge_switch_to_result()
>   merge-ort: add implementation of checkout()
>   tree: enable cmp_cache_name_compare() to be used elsewhere
>   merge-ort: add implementation of record_unmerged_index_entries()
>   merge-ort: free data structures in merge_finalize()
>
>  merge-ort.c | 922 +++++++++++++++++++++++++++++++++++++++++++++++++++-
>  tree.c      |   2 +-
>  tree.h      |   2 +
>  3 files changed, 922 insertions(+), 4 deletions(-)
>
> --
> 2.29.1.56.ga287c268e6.dirty

  parent reply	other threads:[~2020-10-30  3:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-30  3:41 Elijah Newren
2020-10-30  3:41 ` [PATCH 01/20] merge-ort: setup basic internal data structures Elijah Newren
2020-10-30  3:41 ` [PATCH 02/20] merge-ort: add some high-level algorithm structure Elijah Newren
2020-10-30  3:41 ` [PATCH 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren
2020-10-30  3:41 ` [PATCH 04/20] merge-ort: use histogram diff Elijah Newren
2020-10-30  3:41 ` [PATCH 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren
2020-10-30  3:41 ` [PATCH 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren
2020-10-30  3:41 ` [PATCH 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren
2020-10-30  3:41 ` [PATCH 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren
2020-10-30  3:41 ` [PATCH 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren
2020-10-30  3:41 ` [PATCH 10/20] merge-ort: avoid recursing into identical trees Elijah Newren
2020-10-30  3:41 ` [PATCH 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren
2020-10-30  3:41 ` [PATCH 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren
2020-10-30  3:41 ` [PATCH 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren
2020-10-30  3:41 ` [PATCH 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren
2020-10-30  3:41 ` [PATCH 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren
2020-10-30  3:41 ` [PATCH 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren
2020-10-30  3:41 ` [PATCH 17/20] merge-ort: add implementation of checkout() Elijah Newren
2020-10-30  3:41 ` [PATCH 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren
2020-10-30  3:41 ` [PATCH 19/20] merge-ort: add implementation of record_unmerged_index_entries() Elijah Newren
2020-10-30  3:41 ` [PATCH 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren
2020-10-30  3:58 ` Elijah Newren [this message]
2020-11-29  7:43 [PATCH 00/20] fundamentals of merge-ort implementation Elijah Newren via GitGitGadget
2020-11-29  7:47 ` Elijah Newren

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