From: Junio C Hamano <gitster@pobox.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: "Jeff King" <peff@peff.net>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
"Jonathan Nieder" <jrnieder@gmail.com>,
"Paul Smith" <paul@mad-scientist.net>,
git@vger.kernel.org, "Duy Nguyen" <pclouds@gmail.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [ANNOUNCE] Git v2.19.0-rc0
Date: Thu, 23 Aug 2018 06:16:39 -0700 [thread overview]
Message-ID: <xmqqefepkytk.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <f854aba0-6d28-7f2b-aad2-858983c4af36@gmail.com> (Derrick Stolee's message of "Thu, 23 Aug 2018 06:26:58 -0400")
Derrick Stolee <stolee@gmail.com> writes:
> I was thinking that having a mitigation for 2.19 is best, and then we
> can focus as part of the 2.20 cycle how we can properly avoid this
> cost, especially when 32 is a valid option.
> ...
> ... to
> take a 'hasheq' approach [2] like Peff suggested [3]. Since that
> requires auditing all callers of hashcmp to see if hasheq is
> appropriate, it is not a good solution for 2.19 but (in my opinion)
> should be evaluated as part of the 2.20 cycle.
Thanks for thoughtful comments. I think it makes sense to go with
the "tell compiler hashcmp() currently is only about 20-byte array"
for now, as it is trivial to see why it cannot break things.
During 2.20 cycle, we may find out that hasheq() abstraction
performs better than hashcmp() with multiple lengths, and end up
doing that "audit and replace to use hasheq()". But as you said,
it probably isnot a good idea to rush it in this cycle.
next prev parent reply other threads:[~2018-08-23 13:16 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 22:13 [ANNOUNCE] Git v2.19.0-rc0 Junio C Hamano
2018-08-20 22:41 ` Stefan Beller
2018-08-20 23:39 ` Jonathan Nieder
2018-08-21 0:27 ` Jonathan Nieder
2018-08-21 0:46 ` Stefan Beller
2018-08-21 20:41 ` Derrick Stolee
2018-08-21 21:29 ` Jeff King
2018-08-22 0:48 ` brian m. carlson
2018-08-22 3:03 ` Jeff King
2018-08-22 3:36 ` Jeff King
2018-08-22 11:11 ` Derrick Stolee
2018-08-22 5:36 ` brian m. carlson
2018-08-22 6:07 ` Jeff King
2018-08-22 7:39 ` Ævar Arnfjörð Bjarmason
2018-08-22 11:14 ` Derrick Stolee
2018-08-22 15:17 ` Jeff King
2018-08-22 16:08 ` Duy Nguyen
2018-08-22 16:14 ` Duy Nguyen
2018-08-22 16:26 ` Jeff King
2018-08-22 16:49 ` Derrick Stolee
2018-08-22 16:58 ` Duy Nguyen
2018-08-22 17:04 ` Derrick Stolee
2018-08-22 16:59 ` Jeff King
2018-08-22 17:02 ` Junio C Hamano
2018-08-22 15:14 ` Jeff King
2018-08-22 14:28 ` Derrick Stolee
2018-08-22 15:24 ` Jeff King
2018-08-22 12:42 ` Paul Smith
2018-08-22 15:23 ` Jeff King
2018-08-23 1:23 ` Jonathan Nieder
2018-08-23 2:16 ` Jeff King
2018-08-23 2:27 ` Jonathan Nieder
2018-08-23 5:02 ` Jeff King
2018-08-23 5:09 ` brian m. carlson
2018-08-23 5:10 ` Jonathan Nieder
2018-08-23 13:20 ` Junio C Hamano
2018-08-23 16:31 ` wide t/perf output, was " Jeff King
2018-08-23 3:47 ` brian m. carlson
2018-08-23 5:04 ` Jeff King
2018-08-23 10:26 ` Derrick Stolee
2018-08-23 13:16 ` Junio C Hamano [this message]
2018-08-23 16:14 ` Jeff King
2018-08-23 23:30 ` Jacob Keller
2018-08-23 23:40 ` Jeff King
2018-08-24 0:06 ` Jeff King
2018-08-24 0:16 ` Jeff King
2018-08-24 2:48 ` Jacob Keller
2018-08-24 2:59 ` Jeff King
2018-08-24 6:45 ` Jeff King
2018-08-24 11:04 ` Derrick Stolee
2018-08-27 19:36 ` Junio C Hamano
2018-08-23 18:53 ` Jeff King
2018-08-23 20:59 ` Derrick Stolee
2018-08-24 6:56 ` Jeff King
2018-08-24 7:57 ` Ævar Arnfjörð Bjarmason
2018-08-24 16:45 ` Derrick Stolee
2018-08-25 8:26 ` Jeff King
2018-09-02 18:53 ` Kaartic Sivaraam
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