From: Derrick Stolee <derrickstolee@github.com>
To: Junio C Hamano <gitster@pobox.com>,
Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, stolee@gmail.com, avarab@gmail.com,
zhiyou.jx@alibaba-inc.com, jonathantanmy@google.com
Subject: Re: [PATCH 02/11] revision: put object filter into struct rev_info
Date: Mon, 7 Mar 2022 08:59:03 -0500 [thread overview]
Message-ID: <d00617ba-01e8-1a3a-3cf1-49324e604f01@github.com> (raw)
In-Reply-To: <xmqqk0d9z7nc.fsf@gitster.g>
On 3/4/2022 5:15 PM, Junio C Hamano wrote:
> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> static int try_bitmap_count(struct rev_info *revs,
>> - struct list_objects_filter_options *filter,
>> int filter_provided_objects)
>
> This makes quite a lot of sense as filter is now available as
> revs->filter.
>
>> {
>> uint32_t commit_count = 0,
>> @@ -436,7 +434,8 @@ static int try_bitmap_count(struct rev_info *revs,
>> */
>> max_count = revs->max_count;
>>
>> - bitmap_git = prepare_bitmap_walk(revs, filter, filter_provided_objects);
>> + bitmap_git = prepare_bitmap_walk(revs, revs->filter,
>> + filter_provided_objects);
>
> And we should be able to do the same to prepare_bitmap_walk(). It
> is OK if such a change comes later and not as part of this commit.
>
> Perhaps it is deliberate. Unlike the helpers this step touches,
> namely, try_bitmap_count(), try_bitmap_traversal(), and
> try_bitmap_disk_usage(), prepare_bitmap_walk() is not a file-scope
> static helper and updating it will need touching many more places.
I'm making a note that this cleanup can happen in a follow-up series.
>> @@ -597,13 +595,17 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
>> }
>>
>> if (skip_prefix(arg, ("--" CL_ARG__FILTER "="), &arg)) {
>
> #leftoverbit. We need to remember to clean this up, now "--filter"
> is well established (I am assuming this literal-string pasting is
> because we didn't know what the right and final word to be used as
> the option name back when this code was originally written), when
> the code around here is quiescent.
Good point.
>> - parse_list_objects_filter(&filter_options, arg);
>> - if (filter_options.choice && !revs.blob_objects)
>> + if (!revs.filter)
>> + CALLOC_ARRAY(revs.filter, 1);
>> + parse_list_objects_filter(revs.filter, arg);
>> + if (revs.filter->choice && !revs.blob_objects)
>> die(_("object filtering requires --objects"));
>> continue;
>
> OK. The original "filter_options" was a structure and not a pointer
> to a structure; now we have a pointer to a structure in revs as a
> member so we need an on-demand allocation. CALLOC_ARRAY() instead
> of xcalloc(), when we know we are creating one element and not an
> array of elements whose size happens to be one, is not wrong but it
> does look strange. Was there a reason why we avoid xcalloc()?
I think I've been using CALLOC_ARRAY(..., 1) over "... = xcalloc()"
for simplicity's sake for a while. I see quite a few across the
codebase, too, but I can swap the usage here if you feel that is
important.
> Makes me also wonder how big the filter_options structure is;
> because we will not use unbounded many revs structure, it may have
> been a simpler conversion to turn a static struct into an embedded
> struct member in a struct (instead of a member of a struct that is a
> pointer to a struct). That way, we did not have to ...
>>> }
>> if (!strcmp(arg, ("--no-" CL_ARG__FILTER))) {
>> - list_objects_filter_set_no_filter(&filter_options);
>> + if (!revs.filter)
>> + CALLOC_ARRAY(revs.filter, 1);
>
> ... repeat the on-demand allocation. If some code used to pass
> &filter_options in a parameter to helper functions, and such calling
> sites get rewritten to pass the value in the revs.filter pointer,
> and if revs hasn't gone through this codepath, these helper functions
> will start receiving NULL in their filter_options parameter, which
> they may or may not be prepared to take. This "we get rid of a
> global struct and replace it with an on-demand allocated structure,
> pointer to which is stored in the revs structure" rewrite somehow
> makes me nervous.
I think the main idea is that the filter being NULL indicates "no
filter is used. Do a full object walk." If we use a static struct,
then we need to instead use revs->filter.filter_spec.nr, but that
is already being used as a BUG() statement:
const char *list_objects_filter_spec(struct list_objects_filter_options *filter)
{
if (!filter->filter_spec.nr)
BUG("no filter_spec available for this filter");
so a non-NULL filter with no specs is considered invalid, while
a NULL filter _is_ currently considered valid.
While we _could_ make that switch to using a static struct and
change our checks to allow empty specs, that would be a more
involved change. Maybe we can leave it for a follow up?
Thanks,
-Stolee
next prev parent reply other threads:[~2022-03-07 13:59 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 17:55 [PATCH 00/11] Partial bundles Derrick Stolee via GitGitGadget
2022-02-23 17:55 ` [PATCH 01/11] index-pack: document and test the --promisor option Derrick Stolee via GitGitGadget
2022-02-23 17:55 ` [PATCH 02/11] revision: put object filter into struct rev_info Derrick Stolee via GitGitGadget
2022-03-04 22:15 ` Junio C Hamano
2022-03-07 13:59 ` Derrick Stolee [this message]
2022-03-07 16:46 ` Junio C Hamano
2022-02-23 17:55 ` [PATCH 03/11] pack-objects: use rev.filter when possible Derrick Stolee via GitGitGadget
2022-03-04 22:25 ` Junio C Hamano
2022-02-23 17:55 ` [PATCH 04/11] pack-bitmap: drop filter in prepare_bitmap_walk() Derrick Stolee via GitGitGadget
2022-03-04 22:26 ` Junio C Hamano
2022-02-23 17:55 ` [PATCH 05/11] list-objects: consolidate traverse_commit_list[_filtered] Derrick Stolee via GitGitGadget
2022-03-04 22:30 ` Junio C Hamano
2022-02-23 17:55 ` [PATCH 06/11] MyFirstObjectWalk: update recommended usage Derrick Stolee via GitGitGadget
2022-03-04 22:33 ` Junio C Hamano
2022-03-07 14:05 ` Derrick Stolee
2022-03-07 16:47 ` Junio C Hamano
2022-02-23 17:55 ` [PATCH 07/11] bundle: safely handle --objects option Derrick Stolee via GitGitGadget
2022-02-28 16:00 ` Jeff Hostetler
2022-03-04 22:58 ` Junio C Hamano
2022-03-07 14:09 ` Derrick Stolee
2022-03-04 22:57 ` Junio C Hamano
2022-03-07 15:35 ` Ævar Arnfjörð Bjarmason
2022-02-23 17:55 ` [PATCH 08/11] bundle: parse filter capability Derrick Stolee via GitGitGadget
2022-03-07 15:38 ` Ævar Arnfjörð Bjarmason
2022-03-07 16:14 ` Derrick Stolee
2022-03-07 16:22 ` Ævar Arnfjörð Bjarmason
2022-03-07 16:29 ` Derrick Stolee
2022-03-07 15:55 ` Ævar Arnfjörð Bjarmason
2022-02-23 17:55 ` [PATCH 09/11] rev-list: move --filter parsing into revision.c Derrick Stolee via GitGitGadget
2022-02-23 17:55 ` [PATCH 10/11] bundle: create filtered bundles Derrick Stolee via GitGitGadget
2022-03-04 23:35 ` Junio C Hamano
2022-03-07 14:14 ` Derrick Stolee
2022-03-07 16:49 ` Junio C Hamano
2022-03-07 15:44 ` Ævar Arnfjörð Bjarmason
2022-02-23 17:55 ` [PATCH 11/11] bundle: unbundle promisor packs Derrick Stolee via GitGitGadget
2022-03-04 23:43 ` Junio C Hamano
2022-03-07 14:48 ` Derrick Stolee
2022-03-07 16:56 ` Junio C Hamano
2022-03-07 18:57 ` Derrick Stolee
2022-03-07 19:40 ` Junio C Hamano
2022-03-07 19:49 ` Derrick Stolee
2022-03-07 19:54 ` Junio C Hamano
2022-03-07 20:20 ` Derrick Stolee
2022-03-07 21:35 ` Junio C Hamano
2022-03-07 15:47 ` Ævar Arnfjörð Bjarmason
2022-03-07 16:10 ` Derrick Stolee
2022-02-28 17:00 ` [PATCH 00/11] Partial bundles Jeff Hostetler
2022-02-28 17:54 ` Derrick Stolee
2022-03-01 18:03 ` Jeff Hostetler
2022-03-04 19:19 ` Derrick Stolee
2022-03-07 14:55 ` Ævar Arnfjörð Bjarmason
2022-03-07 14:59 ` Derrick Stolee
2022-03-07 21:50 ` [PATCH v2 00/12] " Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 01/12] index-pack: document and test the --promisor option Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 02/12] revision: put object filter into struct rev_info Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 03/12] pack-objects: use rev.filter when possible Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 04/12] pack-bitmap: drop filter in prepare_bitmap_walk() Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 05/12] list-objects: consolidate traverse_commit_list[_filtered] Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 06/12] MyFirstObjectWalk: update recommended usage Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 07/12] bundle: safely handle --objects option Derrick Stolee via GitGitGadget
2022-03-08 9:37 ` Ævar Arnfjörð Bjarmason
2022-03-08 13:45 ` Derrick Stolee
2022-03-08 13:53 ` Ævar Arnfjörð Bjarmason
2022-03-07 21:50 ` [PATCH v2 08/12] bundle: parse filter capability Derrick Stolee via GitGitGadget
2022-03-08 9:25 ` Ævar Arnfjörð Bjarmason
2022-03-08 13:43 ` Derrick Stolee
2022-03-07 21:50 ` [PATCH v2 09/12] rev-list: move --filter parsing into revision.c Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 10/12] bundle: create filtered bundles Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 11/12] bundle: unbundle promisor packs Derrick Stolee via GitGitGadget
2022-03-07 21:50 ` [PATCH v2 12/12] clone: fail gracefully when cloning filtered bundle Derrick Stolee via GitGitGadget
2022-03-07 22:11 ` [PATCH v2 00/12] Partial bundles Junio C Hamano
2022-03-08 14:39 ` [PATCH v3 " Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 01/12] index-pack: document and test the --promisor option Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 02/12] revision: put object filter into struct rev_info Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 03/12] pack-objects: use rev.filter when possible Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 04/12] pack-bitmap: drop filter in prepare_bitmap_walk() Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 05/12] list-objects: consolidate traverse_commit_list[_filtered] Derrick Stolee via GitGitGadget
2022-03-09 13:24 ` Ævar Arnfjörð Bjarmason
2022-03-08 14:39 ` [PATCH v3 06/12] MyFirstObjectWalk: update recommended usage Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 07/12] list-objects: handle NULL function pointers Ævar Arnfjörð Bjarmason via GitGitGadget
2022-03-08 17:26 ` Junio C Hamano
2022-03-09 13:40 ` Ævar Arnfjörð Bjarmason
2022-03-09 14:16 ` Derrick Stolee
2022-03-09 18:32 ` Junio C Hamano
2022-03-08 14:39 ` [PATCH v3 08/12] bundle: parse filter capability Derrick Stolee via GitGitGadget
2022-03-08 17:29 ` Junio C Hamano
2022-03-09 14:35 ` Derrick Stolee
2022-03-09 13:30 ` Ævar Arnfjörð Bjarmason
2022-03-08 14:39 ` [PATCH v3 09/12] rev-list: move --filter parsing into revision.c Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 10/12] bundle: create filtered bundles Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 11/12] bundle: unbundle promisor packs Derrick Stolee via GitGitGadget
2022-03-08 14:39 ` [PATCH v3 12/12] clone: fail gracefully when cloning filtered bundle Derrick Stolee via GitGitGadget
2022-03-08 16:10 ` Derrick Stolee
2022-03-08 17:19 ` Junio C Hamano
2022-03-09 16:01 ` [PATCH v4 00/13] Partial bundles Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 01/13] index-pack: document and test the --promisor option Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 02/13] list-objects-filter-options: create copy helper Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 03/13] revision: put object filter into struct rev_info Derrick Stolee via GitGitGadget
2022-03-09 18:48 ` Junio C Hamano
2022-03-09 16:01 ` [PATCH v4 04/13] pack-objects: use rev.filter when possible Derrick Stolee via GitGitGadget
2022-03-10 13:11 ` Ævar Arnfjörð Bjarmason
2022-03-10 13:33 ` Derrick Stolee
2022-03-10 14:24 ` Ævar Arnfjörð Bjarmason
2022-03-09 16:01 ` [PATCH v4 05/13] pack-bitmap: drop filter in prepare_bitmap_walk() Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 06/13] list-objects: consolidate traverse_commit_list[_filtered] Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 07/13] MyFirstObjectWalk: update recommended usage Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 08/13] list-objects: handle NULL function pointers Ævar Arnfjörð Bjarmason via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 09/13] bundle: parse filter capability Derrick Stolee via GitGitGadget
2022-03-09 18:41 ` Junio C Hamano
2022-03-09 18:55 ` Derrick Stolee
2022-03-09 16:01 ` [PATCH v4 10/13] rev-list: move --filter parsing into revision.c Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 11/13] bundle: create filtered bundles Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 12/13] bundle: unbundle promisor packs Derrick Stolee via GitGitGadget
2022-03-09 16:01 ` [PATCH v4 13/13] clone: fail gracefully when cloning filtered bundle Derrick Stolee via GitGitGadget
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