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From: Taylor Blau <me@ttaylorr.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: git@vger.kernel.org, gitster@pobox.com, larsxschneider@gmail.com,
	peff@peff.net, tytso@mit.edu
Subject: Re: [PATCH 08/17] builtin/pack-objects.c: --cruft without expiration
Date: Mon, 28 Feb 2022 21:48:32 -0500	[thread overview]
Message-ID: <Yh2JgPzR4Tg3PmNL@nand.local> (raw)
In-Reply-To: <b3a30e27-7821-1fcb-bacc-07a6d2b3df76@gmail.com>

On Mon, Dec 06, 2021 at 04:44:31PM -0500, Derrick Stolee wrote:
> On 11/29/2021 5:25 PM, Taylor Blau wrote:
> > Generating a non-expiring cruft packs works as follows:
>
> I had trouble parsing the documentation changes below, so I came back
> to this commit message to see if that helps.
>
> >   - Callers provide a list of every pack they know about, and indicate
> >     which packs are about to be removed.
>
> This corresponds to the list over stdin.
>
> >   - All packs which are going to be removed (we'll call these the
> >     redundant ones) are marked as kept in-core, as well as any packs
> >     that `pack-objects` found but the caller did not specify.
>
> Ok, so as an implementation detail we mark these as keep packs.


> >     These packs are presumed to have entered the repository between
> >     the caller collecting packs and invoking `pack-objects`. Since we
> >     do not want to include objects in these packs (because we don't know
> >     which of their objects are or aren't reachable), these are also
> >     marked as kept in-core.
>
> Here, "are presumed" is doing a lot of work. Theoretically, there could
> be three categories:
>
> 1. This pack was just repacked and will be removed because all of its
>    objects were placed into new objects.
>
> 2. Either this pack was repacked and contains important reachable objects
>    OR we did a repack of reachable objects and this pack contained some
>    extra, unreachable objects.
>
> 3. This pack was added to the repository while creating those repacked
>    packs from category 2, so we don't know if things are reachable or
>    not.
>
> So, the packs that we discover on-disk but are not specified over stdin
> are in this third category, but these are grouped with category 1 as we
> will treat them the same.

Ah, I think I caused some unintentional confusion by attaching "are
presumed" to "these packs", when it wasn't clear that "these packs"
meant "ones that aren't listed over stdin".

Since the caller is supposed to provide a complete picture of the
repository as they see it, any packs known to the pack-objects process
that aren't mentioned over stdin are assumed to have entered the
repository after the caller was spun up.

I'll clarify this section of the commit message, since I agree it is
unnecessarily confusing.

> >   - Then, we enumerate all objects in the repository, and add them to
> >     our packing list if they do not appear in an in-core kept pack.
>
> Here, we are looking at all of the objects in category 2 as well as
> loose objects.

We're enumerating any objects that aren't in packs which are marked as
kept in-core (along with loose objects which don't appear in packs that
are marked as kept in-core).

The in-core kept packs are ones that the caller (and I find it's helpful
to read "the caller" as "git repack") has marked as "will delete". So
the non in-core pack(s) that we're looking at here contain all reachable
objects (e.g., like you would get with `git repack -A`).

> > +	Packs unreachable objects into a separate "cruft" pack, denoted
> > +	by the existence of a `.mtimes` file. Pack names provided over
> > +	stdin indicate which packs will remain after a `git repack`.
> > +	Pack names prefixed with a `-` indicate those which will be
> > +	removed. (...)
>
> This description is too tied to 'git repack'. Can we describe the
> input using terms independent of the 'git repack' operation? I need
> to keep reading.
>
> > (...) The contents of the cruft pack are all objects not
> > +	contained in the surviving packs specified by `--keep-pack`)
>
> Now you use --keep-pack, which is a way of specifying a pack as
> "in-core keep" which was not in your commit message. Here, we also
> don't link the packs over stdin to the concept of keep packs.

The mention of `--keep-pack` is a mistake left over from a previous
version; thanks for spotting. Here's a version of the first paragraph
from this piece of documentation which is less tied to `git repack` and
hopefully a little clearer:

    --cruft::
            Packs unreachable objects into a separate "cruft" pack, denoted
            by the existence of a `.mtimes` file. Typically used by `git
            repack --cruft`. Callers provide a list of pack names and
            indicate which packs will remain in the repository, along with
            which packs will be deleted (indicated by the `-` prefix). The
            contents of the cruft pack are all objects not contained in the
            surviving packs which have not exceeded the grace period (see
            `--cruft-expiration` below), or which have exceeded the grace
            period, but are reachable from an other object which hasn't.

> > +	which have not exceeded the grace period (see
> > +	`--cruft-expiration` below), or which have exceeded the grace
> > +	period, but are reachable from an other object which hasn't.
>
> And now we think about the grace period! There is so much going on
> that I need to break it down to understand.
>
>   An object is _excluded_ from the new cruft pack if
>
>   1. It is reachable from at least one reference.
>   2. It is in a pack from stdin prefixed with "-"
>   3. It is in a pack specified by `--keep-pack`
>   4. It is in an existing cruft pack and the .mtimes file states
>      that its mtime is at least as recent as the time specified by
>      the --cruft-expiration option.
>
> Breaking it down into a list like this helps me, at least. I'm not
> sure what the best way would look like.

Given some expiration T, cruft packs contain all unreachable objects
which are newer than T, along with any cruft objects (i.e., those not
directly reachable from any ref) which are older than T, but reachable
from another cruft object newer than T.

Thanks,
Taylor

  reply	other threads:[~2022-03-01  2:48 UTC|newest]

Thread overview: 201+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-29 22:25 [PATCH 00/17] cruft packs Taylor Blau
2021-11-29 22:25 ` [PATCH 01/17] Documentation/technical: add cruft-packs.txt Taylor Blau
2021-12-02 14:33   ` Derrick Stolee
2021-12-03 21:53     ` Taylor Blau
2021-12-04 22:20   ` Elijah Newren
2021-12-04 23:32     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2021-12-02 15:06   ` Derrick Stolee
2021-12-02 22:32     ` brian m. carlson
2021-12-03 22:24     ` Taylor Blau
2022-01-07 19:41       ` Taylor Blau
2021-11-29 22:25 ` [PATCH 03/17] pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles' Taylor Blau
2021-11-29 22:25 ` [PATCH 04/17] chunk-format.h: extract oid_version() Taylor Blau
2021-12-02 15:22   ` Derrick Stolee
2021-12-03 22:40     ` Taylor Blau
2021-12-06 17:33       ` Derrick Stolee
2021-11-29 22:25 ` [PATCH 05/17] pack-mtimes: support writing pack .mtimes files Taylor Blau
2021-12-02 15:36   ` Derrick Stolee
2021-12-03 23:04     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 06/17] t/helper: add 'pack-mtimes' test-tool Taylor Blau
2021-12-06 21:16   ` Derrick Stolee
2022-02-23 22:24     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 07/17] builtin/pack-objects.c: return from create_object_entry() Taylor Blau
2021-11-29 22:25 ` [PATCH 08/17] builtin/pack-objects.c: --cruft without expiration Taylor Blau
2021-12-06 21:44   ` Derrick Stolee
2022-03-01  2:48     ` Taylor Blau [this message]
2021-12-07 15:17   ` Derrick Stolee
2022-02-23 23:34     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 09/17] reachable: add options to add_unseen_recent_objects_to_traversal Taylor Blau
2021-11-29 22:25 ` [PATCH 10/17] reachable: report precise timestamps from objects in cruft packs Taylor Blau
2021-11-29 22:25 ` [PATCH 11/17] builtin/pack-objects.c: --cruft with expiration Taylor Blau
2021-12-07 15:30   ` Derrick Stolee
2022-02-23 23:35     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 12/17] builtin/repack.c: support generating a cruft pack Taylor Blau
2021-12-05 20:46   ` Junio C Hamano
2022-03-01  2:00     ` Taylor Blau
2021-12-07 15:38   ` Derrick Stolee
2022-02-23 23:37     ` Taylor Blau
2021-11-29 22:25 ` [PATCH 13/17] builtin/repack.c: allow configuring cruft pack generation Taylor Blau
2021-11-29 22:25 ` [PATCH 14/17] builtin/repack.c: use named flags for existing_packs Taylor Blau
2021-11-29 22:25 ` [PATCH 15/17] builtin/repack.c: add cruft packs to MIDX during geometric repack Taylor Blau
2021-11-29 22:25 ` [PATCH 16/17] builtin/gc.c: conditionally avoid pruning objects via loose Taylor Blau
2021-11-29 22:25 ` [PATCH 17/17] sha1-file.c: don't freshen cruft packs Taylor Blau
2021-12-03 19:51 ` [PATCH 00/17] " Junio C Hamano
2021-12-03 20:08   ` Taylor Blau
2021-12-03 20:47     ` Taylor Blau
2022-03-02  0:57 ` [PATCH v2 " Taylor Blau
2022-03-02  0:58   ` [PATCH v2 01/17] Documentation/technical: add cruft-packs.txt Taylor Blau
2022-03-02  0:58   ` [PATCH v2 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2022-03-02 20:22     ` Derrick Stolee
2022-03-02 21:33       ` Taylor Blau
2022-03-02  0:58   ` [PATCH v2 03/17] pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles' Taylor Blau
2022-03-02  0:58   ` [PATCH v2 04/17] chunk-format.h: extract oid_version() Taylor Blau
2022-03-02  0:58   ` [PATCH v2 05/17] pack-mtimes: support writing pack .mtimes files Taylor Blau
2022-03-02  0:58   ` [PATCH v2 06/17] t/helper: add 'pack-mtimes' test-tool Taylor Blau
2022-03-02  0:58   ` [PATCH v2 07/17] builtin/pack-objects.c: return from create_object_entry() Taylor Blau
2022-03-02  0:58   ` [PATCH v2 08/17] builtin/pack-objects.c: --cruft without expiration Taylor Blau
2022-03-02  0:58   ` [PATCH v2 09/17] reachable: add options to add_unseen_recent_objects_to_traversal Taylor Blau
2022-03-02 20:19     ` Derrick Stolee
2022-03-02 21:28       ` Taylor Blau
2022-03-02  0:58   ` [PATCH v2 10/17] reachable: report precise timestamps from objects in cruft packs Taylor Blau
2022-03-02  0:58   ` [PATCH v2 11/17] builtin/pack-objects.c: --cruft with expiration Taylor Blau
2022-03-02  7:42     ` Junio C Hamano
2022-03-02 15:54       ` Taylor Blau
2022-03-02 19:57         ` Derrick Stolee
2022-03-02  0:58   ` [PATCH v2 12/17] builtin/repack.c: support generating a cruft pack Taylor Blau
2022-03-02  0:58   ` [PATCH v2 13/17] builtin/repack.c: allow configuring cruft pack generation Taylor Blau
2022-03-02  0:58   ` [PATCH v2 14/17] builtin/repack.c: use named flags for existing_packs Taylor Blau
2022-03-02  0:58   ` [PATCH v2 15/17] builtin/repack.c: add cruft packs to MIDX during geometric repack Taylor Blau
2022-03-02  0:58   ` [PATCH v2 16/17] builtin/gc.c: conditionally avoid pruning objects via loose Taylor Blau
2022-03-02  0:58   ` [PATCH v2 17/17] sha1-file.c: don't freshen cruft packs Taylor Blau
2022-03-02 20:23   ` [PATCH v2 00/17] " Derrick Stolee
2022-03-02 21:36     ` Taylor Blau
2022-03-03  0:20 ` [PATCH v3 " Taylor Blau
2022-03-03  0:20   ` [PATCH v3 01/17] Documentation/technical: add cruft-packs.txt Taylor Blau
2022-03-07 18:03     ` Jonathan Nieder
2022-03-22  1:16       ` Taylor Blau
2022-03-22 21:45         ` Jonathan Nieder
2022-03-22 22:02           ` Taylor Blau
2022-03-22 23:04             ` Jonathan Nieder
2022-03-23  1:01               ` Taylor Blau
2022-03-28 18:46                 ` Taylor Blau
2022-03-28 20:55                   ` Junio C Hamano
2022-03-28 21:21                     ` Taylor Blau
2022-03-29 15:59                       ` Junio C Hamano
2022-03-30  2:23                         ` Taylor Blau
2022-03-30 13:37                           ` Junio C Hamano
2022-03-30 17:30                             ` Taylor Blau
2022-03-03  0:20   ` [PATCH v3 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2022-03-03  0:20   ` [PATCH v3 03/17] pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles' Taylor Blau
2022-03-03  0:20   ` [PATCH v3 04/17] chunk-format.h: extract oid_version() Taylor Blau
2022-03-03 16:30     ` Ævar Arnfjörð Bjarmason
2022-03-03 23:32       ` Taylor Blau
2022-03-04  0:16         ` Junio C Hamano
2022-03-03  0:20   ` [PATCH v3 05/17] pack-mtimes: support writing pack .mtimes files Taylor Blau
2022-03-03 16:45     ` Ævar Arnfjörð Bjarmason
2022-03-03 23:35       ` Taylor Blau
2022-03-04 10:40         ` Ævar Arnfjörð Bjarmason
2022-03-03  0:20   ` [PATCH v3 06/17] t/helper: add 'pack-mtimes' test-tool Taylor Blau
2022-03-03  0:21   ` [PATCH v3 07/17] builtin/pack-objects.c: return from create_object_entry() Taylor Blau
2022-03-03  0:21   ` [PATCH v3 08/17] builtin/pack-objects.c: --cruft without expiration Taylor Blau
2022-03-03  0:21   ` [PATCH v3 09/17] reachable: add options to add_unseen_recent_objects_to_traversal Taylor Blau
2022-03-03  0:21   ` [PATCH v3 10/17] reachable: report precise timestamps from objects in cruft packs Taylor Blau
2022-03-03  0:21   ` [PATCH v3 11/17] builtin/pack-objects.c: --cruft with expiration Taylor Blau
2022-03-03  0:21   ` [PATCH v3 12/17] builtin/repack.c: support generating a cruft pack Taylor Blau
2022-03-03  0:21   ` [PATCH v3 13/17] builtin/repack.c: allow configuring cruft pack generation Taylor Blau
2022-03-03  0:21   ` [PATCH v3 14/17] builtin/repack.c: use named flags for existing_packs Taylor Blau
2022-03-03  0:21   ` [PATCH v3 15/17] builtin/repack.c: add cruft packs to MIDX during geometric repack Taylor Blau
2022-03-03  0:21   ` [PATCH v3 16/17] builtin/gc.c: conditionally avoid pruning objects via loose Taylor Blau
2022-03-03  0:21   ` [PATCH v3 17/17] sha1-file.c: don't freshen cruft packs Taylor Blau
2022-03-03  1:29   ` [PATCH v3 00/17] " Derrick Stolee
2022-05-18 23:10 ` [PATCH v4 " Taylor Blau
2022-05-18 23:10   ` [PATCH v4 01/17] Documentation/technical: add cruft-packs.txt Taylor Blau
2022-05-19 14:04     ` Junio C Hamano
2022-05-18 23:10   ` [PATCH v4 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2022-05-19 10:40     ` Ævar Arnfjörð Bjarmason
2022-05-19 15:21       ` Junio C Hamano
2022-05-20  7:32         ` Ævar Arnfjörð Bjarmason
2022-05-20 22:37           ` Taylor Blau
2022-05-18 23:10   ` [PATCH v4 03/17] pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles' Taylor Blau
2022-05-18 23:11   ` [PATCH v4 04/17] chunk-format.h: extract oid_version() Taylor Blau
2022-05-19 11:44     ` Ævar Arnfjörð Bjarmason
2022-05-18 23:11   ` [PATCH v4 05/17] pack-mtimes: support writing pack .mtimes files Taylor Blau
2022-05-18 23:11   ` [PATCH v4 06/17] t/helper: add 'pack-mtimes' test-tool Taylor Blau
2022-05-18 23:11   ` [PATCH v4 07/17] builtin/pack-objects.c: return from create_object_entry() Taylor Blau
2022-05-18 23:11   ` [PATCH v4 08/17] builtin/pack-objects.c: --cruft without expiration Taylor Blau
2022-05-19 10:04     ` Junio C Hamano
2022-05-19 15:16       ` Junio C Hamano
2022-05-20 22:52         ` Taylor Blau
2022-05-18 23:11   ` [PATCH v4 09/17] reachable: add options to add_unseen_recent_objects_to_traversal Taylor Blau
2022-05-18 23:11   ` [PATCH v4 10/17] reachable: report precise timestamps from objects in cruft packs Taylor Blau
2022-05-18 23:11   ` [PATCH v4 11/17] builtin/pack-objects.c: --cruft with expiration Taylor Blau
2022-05-18 23:11   ` [PATCH v4 12/17] builtin/repack.c: support generating a cruft pack Taylor Blau
2022-05-19 11:29     ` Ævar Arnfjörð Bjarmason
2022-05-20 22:39       ` Taylor Blau
2022-05-18 23:11   ` [PATCH v4 13/17] builtin/repack.c: allow configuring cruft pack generation Taylor Blau
2022-05-18 23:11   ` [PATCH v4 14/17] builtin/repack.c: use named flags for existing_packs Taylor Blau
2022-05-18 23:11   ` [PATCH v4 15/17] builtin/repack.c: add cruft packs to MIDX during geometric repack Taylor Blau
2022-05-19 11:32     ` Ævar Arnfjörð Bjarmason
2022-05-20 22:42       ` Taylor Blau
2022-05-18 23:11   ` [PATCH v4 16/17] builtin/gc.c: conditionally avoid pruning objects via loose Taylor Blau
2022-05-18 23:11   ` [PATCH v4 17/17] sha1-file.c: don't freshen cruft packs Taylor Blau
2022-05-18 23:48   ` [PATCH v4 00/17] " Derrick Stolee
2022-05-20 23:19     ` Junio C Hamano
2022-05-20 23:30       ` Taylor Blau
2022-05-19 11:42   ` [RFC PATCH 0/2] Utility functions for duplicated pack(write) code Ævar Arnfjörð Bjarmason
2022-05-19 11:42     ` [RFC PATCH 1/2] packfile API: add and use a pack_name_to_ext() utility function Ævar Arnfjörð Bjarmason
2022-05-19 15:40       ` Junio C Hamano
2022-05-19 11:42     ` [RFC PATCH 2/2] hash API: add and use a hash_short_id_by_algo() function Ævar Arnfjörð Bjarmason
2022-05-19 15:50       ` Junio C Hamano
2022-05-19 19:07         ` Ævar Arnfjörð Bjarmason
2022-05-19 15:31     ` [RFC PATCH 0/2] Utility functions for duplicated pack(write) code Junio C Hamano
2022-05-19 11:54   ` [PATCH v4 00/17] cruft packs Ævar Arnfjörð Bjarmason
2022-05-20 23:17 ` [PATCH v5 " Taylor Blau
2022-05-20 23:17   ` [PATCH v5 01/17] Documentation/technical: add cruft-packs.txt Taylor Blau
2022-05-20 23:17   ` [PATCH v5 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2022-05-24 19:32     ` Jonathan Nieder
2022-05-24 19:44       ` rsbecker
2022-05-24 22:25         ` Taylor Blau
2022-05-24 23:24           ` rsbecker
2022-05-25  0:07             ` Taylor Blau
2022-05-25  0:20               ` rsbecker
2022-05-25  9:11               ` adding new 32-bit on-disk (unsigned) timestamp formats (was: [PATCH v5 02/17] pack-mtimes: support reading .mtimes files) Ævar Arnfjörð Bjarmason
2022-05-25 13:30                 ` Derrick Stolee
2022-05-25 21:13                   ` Taylor Blau
2022-05-26  0:02                     ` Ævar Arnfjörð Bjarmason
2022-05-26  0:12                       ` Taylor Blau
2022-05-24 22:21       ` [PATCH v5 02/17] pack-mtimes: support reading .mtimes files Taylor Blau
2022-05-25  7:48         ` Jonathan Nieder
2022-05-25 21:36           ` Taylor Blau
2022-05-25 21:58             ` rsbecker
2022-05-25 22:59               ` Taylor Blau
2022-05-25 23:02     ` Taylor Blau
2022-05-26  0:30       ` Junio C Hamano
2023-06-01 13:01     ` Andreas Schwab
2022-05-20 23:17   ` [PATCH v5 03/17] pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles' Taylor Blau
2022-05-20 23:17   ` [PATCH v5 04/17] chunk-format.h: extract oid_version() Taylor Blau
2022-05-20 23:17   ` [PATCH v5 05/17] pack-mtimes: support writing pack .mtimes files Taylor Blau
2022-05-20 23:17   ` [PATCH v5 06/17] t/helper: add 'pack-mtimes' test-tool Taylor Blau
2022-05-20 23:17   ` [PATCH v5 07/17] builtin/pack-objects.c: return from create_object_entry() Taylor Blau
2022-05-20 23:17   ` [PATCH v5 08/17] builtin/pack-objects.c: --cruft without expiration Taylor Blau
2022-05-20 23:17   ` [PATCH v5 09/17] reachable: add options to add_unseen_recent_objects_to_traversal Taylor Blau
2022-05-20 23:17   ` [PATCH v5 10/17] reachable: report precise timestamps from objects in cruft packs Taylor Blau
2022-05-20 23:18   ` [PATCH v5 11/17] builtin/pack-objects.c: --cruft with expiration Taylor Blau
2022-05-20 23:18   ` [PATCH v5 12/17] builtin/repack.c: support generating a cruft pack Taylor Blau
2022-05-20 23:18   ` [PATCH v5 13/17] builtin/repack.c: allow configuring cruft pack generation Taylor Blau
2022-05-20 23:18   ` [PATCH v5 14/17] builtin/repack.c: use named flags for existing_packs Taylor Blau
2022-05-20 23:18   ` [PATCH v5 15/17] builtin/repack.c: add cruft packs to MIDX during geometric repack Taylor Blau
2022-05-20 23:18   ` [PATCH v5 16/17] builtin/gc.c: conditionally avoid pruning objects via loose Taylor Blau
2022-06-19  5:38     ` René Scharfe
2022-06-21 15:58       ` Junio C Hamano
2022-05-20 23:18   ` [PATCH v5 17/17] sha1-file.c: don't freshen cruft packs Taylor Blau
2022-05-21 11:17   ` [PATCH v5 00/17] " Ævar Arnfjörð Bjarmason
2022-05-24 19:39     ` Jonathan Nieder
2022-05-24 21:50       ` Taylor Blau
2022-05-24 21:55         ` Ævar Arnfjörð Bjarmason
2022-05-24 22:12           ` Taylor Blau
2022-05-25  7:53             ` Jonathan Nieder
2022-05-25 19:59               ` Derrick Stolee
2022-05-25 21:09                 ` Taylor Blau
2022-05-26  0:06                   ` Ævar Arnfjörð Bjarmason

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