From: "hiro via 9fans" <9fans@9fans.net>
To: 9fans <9fans@9fans.net>
Subject: Re: mmaping on plan9? (was Re: [9fans] venti /plan9port mmapped
Date: Mon, 16 Feb 2026 13:33:20 +0100 [thread overview]
Message-ID: <CAFSF3XPk23jbgyzmHk_HeVqrOHb8PUub0bipCWHEwypxnVLesA@mail.gmail.com> (raw)
In-Reply-To: <17712086720.7271a7.5370@composer.9fans.topicbox.com>
On Mon, Feb 16, 2026 at 3:45 AM Alyssa M via 9fans <9fans@9fans.net> wrote:
>
> This is interesting because it's a large data structure that's very sparsely read or written. I'd read the entire file system image into the segment in one gulp, respond to some file protocol requests (e.g. over 9P) by treating the segment as a single data structure, and write the entire image out periodically to implement what we used to call 'sync'.
> With traditional I/O that would be ridiculous. With the above mechanism it should work about as well as mmap would. And without all that cache code and block fetching. Which is the point of this.
"I'd read the entire file system image into the segment in one gulp"
But you wouldn't, actually, as you already aluded to...
Are you aware how read() is commonly implemented?
Maybe you get confused between kernelspace and userspace?
Where is this fileserver running for you? In kernel or not?
------------------------------------------
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next prev parent reply other threads:[~2026-02-16 13:23 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-02 19:54 [9fans] venti /plan9port mmapped wb.kloke
2026-01-02 20:39 ` ori
2026-01-02 20:58 ` Bakul Shah via 9fans
2026-01-06 22:59 ` Ron Minnich
2026-01-07 4:27 ` Noam Preil
2026-01-07 6:15 ` Shawn Rutledge
2026-01-07 15:46 ` Persistent memory (was Re: [9fans] venti /plan9port mmapped) arnold
2026-01-07 16:11 ` Noam Preil
2026-01-07 17:26 ` Wes Kussmaul
2026-01-07 8:52 ` [9fans] venti /plan9port mmapped wb.kloke
2026-01-07 16:30 ` mmaping on plan9? (was " Bakul Shah via 9fans
2026-01-07 16:40 ` Noam Preil
2026-01-07 16:41 ` ori
2026-01-07 20:35 ` Bakul Shah via 9fans
2026-01-07 21:31 ` ron minnich
2026-01-08 7:56 ` arnold
2026-01-08 10:31 ` wb.kloke
2026-01-09 0:02 ` ron minnich
2026-01-09 3:57 ` Paul Lalonde
2026-01-09 5:10 ` ron minnich
2026-01-09 5:18 ` arnold
2026-01-09 6:06 ` David Leimbach via 9fans
2026-01-09 17:13 ` ron minnich
2026-01-09 17:39 ` tlaronde
2026-01-09 19:48 ` David Leimbach via 9fans
2026-02-05 21:30 ` Alyssa M via 9fans
2026-02-08 14:18 ` Ethan Azariah
2026-02-08 15:10 ` Alyssa M via 9fans
2026-02-08 20:43 ` Ethan Azariah
2026-02-09 1:35 ` ron minnich
2026-02-09 15:23 ` ron minnich
2026-02-09 17:13 ` Bakul Shah via 9fans
2026-02-09 21:38 ` ron minnich
2026-02-10 10:13 ` Alyssa M via 9fans
2026-02-11 1:43 ` Ron Minnich
2026-02-11 2:19 ` Bakul Shah via 9fans
2026-02-11 3:21 ` Ori Bernstein
2026-02-11 10:01 ` hiro
2026-02-12 1:36 ` Dan Cross
2026-02-12 5:39 ` Alyssa M via 9fans
2026-02-12 9:08 ` hiro via 9fans
2026-02-12 13:34 ` Alyssa M via 9fans
2026-02-13 13:48 ` hiro
2026-02-13 17:21 ` ron minnich
2026-02-15 16:12 ` Danny Wilkins via 9fans
2026-02-17 3:13 ` Alyssa M via 9fans
2026-02-17 13:02 ` Dan Cross
2026-02-17 16:00 ` ron minnich
2026-02-17 16:39 ` hiro
2026-02-17 16:56 ` Bakul Shah via 9fans
2026-02-17 17:54 ` hiro
2026-02-17 22:21 ` Alyssa M via 9fans
2026-02-16 2:24 ` Alyssa M via 9fans
2026-02-16 3:17 ` Ori Bernstein
2026-02-16 10:55 ` Frank D. Engel, Jr.
2026-02-16 13:49 ` Ori Bernstein
2026-02-16 19:40 ` Bakul Shah via 9fans
2026-02-16 19:43 ` Bakul Shah via 9fans
2026-02-16 9:50 ` tlaronde
2026-02-16 12:24 ` hiro via 9fans
2026-02-16 12:33 ` hiro via 9fans [this message]
2026-02-11 14:22 ` Dan Cross
2026-02-11 18:44 ` Ori Bernstein
2026-02-12 1:22 ` Dan Cross
2026-02-12 4:26 ` Ori Bernstein
2026-02-12 4:34 ` Dan Cross
2026-02-12 3:12 ` Alyssa M via 9fans
2026-02-12 4:52 ` Dan Cross
2026-02-12 8:37 ` Alyssa M via 9fans
2026-02-12 12:37 ` hiro via 9fans
2026-02-13 1:36 ` Dan Cross
2026-02-14 3:35 ` Alyssa M via 9fans
2026-02-14 14:26 ` Dan Cross
2026-02-15 4:34 ` Bakul Shah via 9fans
2026-02-15 10:19 ` hiro
2026-02-10 16:49 ` wb.kloke
2026-02-08 14:08 ` Ethan Azariah
2026-01-07 21:40 ` ori
2026-01-07 16:52 ` ori
2026-01-07 17:37 ` wb.kloke
2026-01-07 17:46 ` Noam Preil
2026-01-07 17:56 ` wb.kloke
2026-01-07 18:07 ` Noam Preil
2026-01-07 18:58 ` wb.kloke
2026-01-07 14:57 ` Thaddeus Woskowiak
2026-01-07 16:07 ` Wes Kussmaul
2026-01-07 16:22 ` Noam Preil
2026-01-07 17:31 ` Wes Kussmaul
2026-01-07 16:13 ` Noam Preil
2026-01-02 21:01 ` ori
2026-01-08 15:59 ` wb.kloke
2026-02-11 23:19 ` red
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