From: Paolo Bonzini <bonzini@gnu.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: Jonathan Nieder <jrnieder@gmail.com>,
git@vger.kernel.org, Zygo Blaxell <zblaxell@gibbs.hungrycats.org>
Subject: Re: mmap with MAP_PRIVATE is useless
Date: Sun, 14 Feb 2010 03:11:30 +0100 [thread overview]
Message-ID: <4B775BD2.3040007@gnu.org> (raw)
In-Reply-To: <7vy6iw4m6r.fsf@alter.siamese.dyndns.org>
On 02/14/2010 02:53 AM, Junio C Hamano wrote:
> Back when most of these mmap calls were written by Linus and myself,
> we weren't interested in using MAP_PRIVATE, or any other trick for
> that matter, to deal with the case where the user tells git to go
> index a file, and then mucks with the file before git finishes and
> gives back control.
Eh, this one in particular (in index_fd) is quite ancient...
commit e83c5163316f89bfbde7d9ab23ca2e25604af290
Author: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Thu Apr 7 15:13:13 2005 -0700
Initial revision of "git", the information manager from hell
:-)
There were three mmap calls -- in read_sha1_file, read_cache and
index_fd -- and all three were of the same mmap (NULL, st.st_size,
PROT_READ, MAP_PRIVATE, fd, 0) shape.
Paolo
prev parent reply other threads:[~2010-02-14 2:11 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100211234753.22574.48799.reportbug@gibbs.hungrycats.org>
2010-02-12 0:27 ` Bug#569505: git-core: 'git add' corrupts repository if the working directory is modified as it runs Jonathan Nieder
2010-02-12 1:23 ` Zygo Blaxell
2010-02-13 12:12 ` Jonathan Nieder
2010-02-13 13:39 ` Ilari Liusvaara
2010-02-13 14:39 ` Thomas Rast
2010-02-13 16:29 ` Ilari Liusvaara
2010-02-13 22:09 ` Dmitry Potapov
2010-02-13 22:37 ` Zygo Blaxell
2010-02-14 1:18 ` [PATCH] don't use mmap() to hash files Dmitry Potapov
2010-02-14 1:37 ` Junio C Hamano
2010-02-14 2:18 ` Dmitry Potapov
2010-02-14 3:14 ` Junio C Hamano
2010-02-14 11:14 ` Thomas Rast
2010-02-14 11:46 ` Junio C Hamano
2010-02-14 1:53 ` Johannes Schindelin
2010-02-14 2:00 ` Junio C Hamano
2010-02-14 2:42 ` Dmitry Potapov
2010-02-14 11:07 ` Jakub Narebski
2010-02-14 11:55 ` Paolo Bonzini
2010-02-14 18:10 ` Johannes Schindelin
2010-02-14 19:06 ` Dmitry Potapov
2010-02-14 19:22 ` Johannes Schindelin
2010-02-14 19:28 ` Johannes Schindelin
2010-02-14 19:56 ` Dmitry Potapov
2010-02-14 23:52 ` Zygo Blaxell
2010-02-15 5:05 ` Nicolas Pitre
2010-02-15 12:23 ` Dmitry Potapov
2010-02-15 7:48 ` Paolo Bonzini
2010-02-15 12:25 ` Dmitry Potapov
2010-02-14 19:55 ` Dmitry Potapov
2010-02-14 23:13 ` Avery Pennarun
2010-02-15 4:16 ` Nicolas Pitre
2010-02-15 5:01 ` Avery Pennarun
2010-02-15 5:48 ` Nicolas Pitre
2010-02-15 19:19 ` Avery Pennarun
2010-02-15 19:29 ` Nicolas Pitre
2010-02-14 3:05 ` [PATCH v2] " Dmitry Potapov
2010-02-18 1:16 ` [PATCH] Teach "git add" and friends to be paranoid Junio C Hamano
2010-02-18 1:20 ` Junio C Hamano
2010-02-18 15:32 ` Zygo Blaxell
2010-02-19 17:51 ` Junio C Hamano
2010-02-18 1:38 ` Jeff King
2010-02-18 4:55 ` Nicolas Pitre
2010-02-18 5:36 ` Junio C Hamano
2010-02-18 7:27 ` Wincent Colaiuta
2010-02-18 16:18 ` Zygo Blaxell
2010-02-18 18:12 ` Jonathan Nieder
2010-02-18 18:35 ` Junio C Hamano
2010-02-22 12:59 ` Paolo Bonzini
2010-02-22 13:33 ` Dmitry Potapov
2010-02-18 10:14 ` Thomas Rast
2010-02-18 18:16 ` Junio C Hamano
2010-02-18 19:58 ` Nicolas Pitre
2010-02-18 20:11 ` 16 gig, 350,000 file repository Bill Lear
2010-02-18 20:58 ` Nicolas Pitre
2010-02-19 9:27 ` Erik Faye-Lund
2010-02-22 22:20 ` Bill Lear
2010-02-22 22:31 ` Nicolas Pitre
2010-02-18 20:14 ` [PATCH] Teach "git add" and friends to be paranoid Peter Harris
2010-02-18 20:17 ` Junio C Hamano
2010-02-18 21:30 ` Nicolas Pitre
2010-02-19 1:04 ` Jonathan Nieder
2010-02-19 15:26 ` Zygo Blaxell
2010-02-19 17:52 ` Junio C Hamano
2010-02-19 19:08 ` Zygo Blaxell
2010-02-19 8:28 ` Dmitry Potapov
2010-02-19 17:52 ` Junio C Hamano
2010-02-20 19:23 ` Junio C Hamano
2010-02-21 7:21 ` Dmitry Potapov
2010-02-21 19:32 ` Junio C Hamano
2010-02-22 3:35 ` Dmitry Potapov
2010-02-22 6:59 ` Junio C Hamano
2010-02-22 12:25 ` Dmitry Potapov
2010-02-22 15:40 ` Nicolas Pitre
2010-02-22 16:01 ` Dmitry Potapov
2010-02-22 17:31 ` Zygo Blaxell
2010-02-22 18:01 ` Nicolas Pitre
2010-02-22 19:56 ` Junio C Hamano
2010-02-22 20:52 ` Nicolas Pitre
2010-02-22 18:05 ` Dmitry Potapov
2010-02-22 18:14 ` Nicolas Pitre
2010-02-14 1:36 ` mmap with MAP_PRIVATE is useless (was Re: Bug#569505: git-core: 'git add' corrupts repository if the working directory is modified as it runs) Paolo Bonzini
2010-02-14 1:53 ` mmap with MAP_PRIVATE is useless Junio C Hamano
2010-02-14 2:11 ` Paolo Bonzini [this message]
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