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From: Duy Nguyen <pclouds@gmail.com>
To: Thomas Gummerer <t.gummerer@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Thomas Rast <trast@inf.ethz.ch>,
	Michael Haggerty <mhagger@alum.mit.edu>,
	Junio C Hamano <gitster@pobox.com>,
	Robin Rosenberg <robin.rosenberg@dewire.com>
Subject: Re: [PATCH 5.5/22] Add documentation for the index api
Date: Thu, 11 Jul 2013 18:42:06 +0700	[thread overview]
Message-ID: <CACsJy8DNQ5Sr4a7PZMX4G-pf+fHqR398b3mncCZtQ-BBBpD+RQ@mail.gmail.com> (raw)
In-Reply-To: <87ppupcp19.fsf@gmail.com>

On Thu, Jul 11, 2013 at 6:30 PM, Thomas Gummerer <t.gummerer@gmail.com> wrote:
> Duy Nguyen <pclouds@gmail.com> writes:
>
>> On Wed, Jul 10, 2013 at 3:10 AM, Thomas Gummerer <t.gummerer@gmail.com> wrote:
>>>> If you happen to know that certain entries match the given pathspec,
>>>> you could help the caller avoid match_pathspec'ing again by set a bit
>>>> in ce_flags.
>>>
>>> I currently don't know which entries do match the pathspec from just
>>> reading the index file, additional calls would be needed.  I don't think
>>> that would be worth the overhead.
>>
>> Yeah I now see that you select what to load in v5 with the adjusted
>> pathspec, not the input pathspec. Originally I thought you match the
>> input pathspec against every file entry in the index :P Your adjusted
>> pathspec looks like what common_prefix is for. It's cheaper than
>> creating adjusted_pathspec from match_pathspec and reduces loading in
>> major cases, where glob is not used.
>>
>> Still, creating an adjusted pathspec this way looks iffy. You need to
>> understand pathspec in order to strip the filename part out to match
>> the directory match only. An alternative is use
>> tree_entry_interesting. It goes along well with tree traversal and can
>> be used to match directories with original pathspec. Once you see it
>> matches an entry in a directory, you could skip matching the rest of
>> the files and load the whole directory. read_index_filtered_v5 and
>> read_entries may need some tweaking though. I'll try it and post a
>> patch later if I succeed.
>
> Hrm, I played around a bit with this idea, but I couldn't figure out how
> to make it work.  For it to work we would still have to load some
> entries in a directory at least?  Or is there a way to match the
> directories, which I just haven't figured out yet?

Yes you have to load some entries first. Even if a directory does not
match, we only know until at least the first file in the directory. OK
there might be problems because tree_entry_interesting expects all
entries in a directory to be memcmp sorted, without trailing slash for
subdirectories. I need to check again if v5 sort order is compatible..
--
Duy

  reply	other threads:[~2013-07-11 11:42 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-07  8:11 [PATCH 00/22] Index v5 Thomas Gummerer
2013-07-07  8:11 ` [PATCH 01/22] t2104: Don't fail for index versions other than [23] Thomas Gummerer
2013-07-07  8:11 ` [PATCH 02/22] read-cache: split index file version specific functionality Thomas Gummerer
2013-07-07  8:11 ` [PATCH 03/22] read-cache: move index v2 specific functions to their own file Thomas Gummerer
2013-07-07  8:11 ` [PATCH 04/22] read-cache: Re-read index if index file changed Thomas Gummerer
2013-07-07  8:11 ` [PATCH 05/22] read-cache: add index reading api Thomas Gummerer
2013-07-08  2:01   ` Duy Nguyen
2013-07-08 11:40     ` Thomas Gummerer
2013-07-08  2:19   ` Duy Nguyen
2013-07-08 11:20     ` Thomas Gummerer
2013-07-08 12:45       ` Duy Nguyen
2013-07-08 13:37         ` Thomas Gummerer
2013-07-08 20:54         ` [PATCH 5.5/22] Add documentation for the index api Thomas Gummerer
2013-07-09 15:42           ` Duy Nguyen
2013-07-09 20:10             ` Thomas Gummerer
2013-07-10  5:28               ` Duy Nguyen
2013-07-11 11:30                 ` Thomas Gummerer
2013-07-11 11:42                   ` Duy Nguyen [this message]
2013-07-11 12:27                     ` Duy Nguyen
2013-07-08 16:36   ` [PATCH 05/22] read-cache: add index reading api Junio C Hamano
2013-07-08 20:10     ` Thomas Gummerer
2013-07-08 23:09       ` Junio C Hamano
2013-07-09 20:13         ` Thomas Gummerer
2013-07-07  8:11 ` [PATCH 06/22] make sure partially read index is not changed Thomas Gummerer
2013-07-08 16:31   ` Junio C Hamano
2013-07-08 18:33     ` Thomas Gummerer
2013-07-07  8:11 ` [PATCH 07/22] dir.c: use index api Thomas Gummerer
2013-07-07  8:11 ` [PATCH 08/22] tree.c: " Thomas Gummerer
2013-07-07  8:11 ` [PATCH 09/22] name-hash.c: " Thomas Gummerer
2013-07-07  8:11 ` [PATCH 10/22] grep.c: Use " Thomas Gummerer
2013-07-07  8:11 ` [PATCH 11/22] ls-files.c: use the " Thomas Gummerer
2013-07-07  8:11 ` [PATCH 12/22] read-cache: make read_blob_data_from_index use " Thomas Gummerer
2013-07-07  8:11 ` [PATCH 13/22] documentation: add documentation of the index-v5 file format Thomas Gummerer
2013-07-11 10:39   ` Duy Nguyen
2013-07-11 11:39     ` Thomas Gummerer
2013-07-11 11:47       ` Duy Nguyen
2013-07-11 12:26         ` Thomas Gummerer
2013-07-11 12:50           ` Duy Nguyen
2013-07-07  8:11 ` [PATCH 14/22] read-cache: make in-memory format aware of stat_crc Thomas Gummerer
2013-07-07  8:11 ` [PATCH 15/22] read-cache: read index-v5 Thomas Gummerer
2013-07-07 20:18   ` Eric Sunshine
2013-07-08 11:40     ` Thomas Gummerer
2013-07-07  8:11 ` [PATCH 16/22] read-cache: read resolve-undo data Thomas Gummerer
2013-07-07  8:11 ` [PATCH 17/22] read-cache: read cache-tree in index-v5 Thomas Gummerer
2013-07-07 20:41   ` Eric Sunshine
2013-07-07  8:11 ` [PATCH 18/22] read-cache: write index-v5 Thomas Gummerer
2013-07-07 20:43   ` Eric Sunshine
2013-07-07  8:11 ` [PATCH 19/22] read-cache: write index-v5 cache-tree data Thomas Gummerer
2013-07-07  8:11 ` [PATCH 20/22] read-cache: write resolve-undo data for index-v5 Thomas Gummerer
2013-07-07  8:11 ` [PATCH 21/22] update-index.c: rewrite index when index-version is given Thomas Gummerer
2013-07-07  8:12 ` [PATCH 22/22] p0003-index.sh: add perf test for the index formats Thomas Gummerer

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