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From: Junio C Hamano <gitster@pobox.com>
To: gitzilla@gmail.com
Cc: Jakub Narebski <jnareb@gmail.com>,
	Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
	Ted Ts'o <tytso@mit.edu>, Jonathan Nieder <jrnieder@gmail.com>,
	Ævar Arnfjörð Bjarmason <avarab@gmail.com>,
	Clemens Buchacher <drizzd@aon.at>,
	git@vger.kernel.org
Subject: Re: generation numbers
Date: Thu, 07 Jul 2011 17:29:16 -0700
Message-ID: <7vei21haxv.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: <4E161CA3.2050001@gmail.com>

A Large Angry SCM <gitzilla@gmail.com> writes:

> On 07/07/2011 04:31 PM, Jakub Narebski wrote:
>> On Thu, 7 Jul 2011, Junio C Hamano wrote:
>>> Jeff King<peff@peff.net>  writes:
>>>
>>>> You could "cheat" and instead of storing the sha1 of a blob object in
>>>> the notes tree, use the lower 32 bits to store an actual value. I don't
>>>> think that currently breaks any assumptions in the notes code, but it
>>>> definitely is against the intent of it.
>>>
>>> I highly suspect that it would break fsck rather badly.  You may not even
>>> be able to repack a repository with such a notes tree.
>>
>> Well, we could (ab)use file mode to mark that what would be sha1 actually
>> stores fixed-width content of a file, like we do with submodules.
>>
>> This technique is I think quite similar in idea to filesystems storing
>> contents of small files in file inode, isn't it?
>
> Are the benefits really worth all these hacks?

Not at all. Don't take everything everybody says about low level
implementation too seriously. Most people do not know what they are
talking about ;-).

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-11 19:04 [PATCH 0/4] Speed up git tag --contains Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 1/4] tag: speed up --contains calculation Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 2/4] limit "contains" traversals based on commit timestamp Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 3/4] default core.clockskew variable to one day Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 4/4] Why is "git tag --contains" so slow? Ævar Arnfjörð Bjarmason
2011-07-06  6:40 ` [PATCH 0/4] Speed up git tag --contains Jeff King
2011-07-06  6:54   ` Jeff King
2011-07-06 19:06     ` Clemens Buchacher
2011-07-06  6:56   ` Jonathan Nieder
2011-07-06  7:03     ` Jeff King
2011-07-06 14:26       ` generation numbers (was: [PATCH 0/4] Speed up git tag --contains) Jakub Narebski
2011-07-06 15:01         ` Ted Ts'o
2011-07-06 18:12           ` Jeff King
2011-07-06 18:46             ` Jakub Narebski
2011-07-07 18:59               ` Jeff King
2011-07-07 19:34                 ` generation numbers Junio C Hamano
2011-07-07 20:31                   ` Jakub Narebski
2011-07-07 20:52                     ` A Large Angry SCM
2011-07-08  0:29                       ` Junio C Hamano [this message]
2011-07-08 22:57                   ` Jeff King
2011-07-06 23:22             ` Junio C Hamano
2011-07-07 19:08               ` Jeff King
2011-07-07 20:10                 ` Jakub Narebski
2018-01-12 18:56   ` [PATCH 0/4] Speed up git tag --contains csilvers
2018-03-03  5:15     ` Jeff King
2018-03-08 23:05       ` csilvers
2018-03-12 13:45       ` Derrick Stolee
2018-03-12 23:59         ` Jeff King

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