Home » Mailing list archives » linux-kernel » 2008 » April » 13

Re: [PATCH] Replace completions with semaphores

!MAILaRCHIVE_VOTE_RePLACE
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
[view in full thread]
From: Bart Van Assche <bart.vanassche@...>
To: Ingo Molnar <mingo@...>
Cc: Matthew Wilcox <matthew@...>, Roland Dreier <rdreier@...>, Peter Zijlstra <peterz@...>, Ingo Oeser <ioe-lkml@...>, Daniel Walker <dwalker@...>, <linux-kernel@...>, Linus Torvalds <torvalds@...>
Subject: Re: [PATCH] Replace completions with semaphores
Date: Sunday, April 13, 2008 - 10:55 am

On Sun, Apr 13, 2008 at 9:08 AM, Ingo Molnar <mingo@elte.hu> wrote:

I know the semaphore-to-mutex rewrites were essential a.o. to make
further merging of the real-time tree into the mainstream Linux kernel
possible. But the semaphore concept is more powerful than the mutex
concept: semaphores can be used to let one thread wait for a state
change reported by another thread. Should all state-change-waiting be
implemented via wait_event*() functions ?

One of the strengths of the Linux kernel is that the barrier for new
developers is low: in theory anyone familiar with the C programming
language can start writing kernel drivers. Most people still learn
kernel development via the third edition of the "Linux Device Drivers"
book, and with some luck or some help, they come across an overview of
the 2.6 kernel API changes (http://lwn.net/Articles/2.6-kernel-api/).
The LWN book is getting outdated after all the 2.6 kernel API changes,
and the page with 2.6 kernel API changes was last updated six months
ago. Where can a kernel developer find up to date information about
kernel programming ?

Bart.
--
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
Messages in current thread:
[PATCH] Replace completions with semaphores, Matthew Wilcox, (Fri Apr 11, 5:00 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 8:24 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 3:05 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 8:52 am)
Re: [PATCH] Replace completions with semaphores, Jens Axboe, (Mon Apr 14, 12:54 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 11:41 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 1:46 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 1:26 pm)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Sat Apr 12, 3:53 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 9:55 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 10:22 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 4:47 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 3:08 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 10:55 am)
Re: API documentation (was [PATCH] Replace completions with ..., Jonathan Corbet, (Mon Apr 14, 1:12 pm)
Re: API documentation (was [PATCH] Replace completions with ..., Peter Zijlstra, (Mon Apr 14, 1:33 pm)
Re: API documentation (was [PATCH] Replace completions with ..., Bart Van Assche, (Mon Apr 14, 2:38 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 8:57 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 11:39 am)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Mon Apr 14, 11:58 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 12:32 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 1:46 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 1:54 pm)
Re: [PATCH] Replace completions with semaphores, Alan Cox, (Mon Apr 14, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 2:18 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Tue Apr 15, 2:46 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 3:17 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Tue Apr 15, 4:44 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 12:09 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 12:27 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 12:57 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 1:15 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 1:26 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 1:41 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 2:14 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Wed Apr 16, 12:07 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:16 pm)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 12:31 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 12:50 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:58 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 1:08 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 2:10 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 1:12 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:34 pm)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 12:42 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:44 pm)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Wed Apr 16, 12:47 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Tue Apr 15, 1:05 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 2:50 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Wed Apr 16, 8:37 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Wed Apr 16, 8:50 am)
Killable stat/readdir, Matthew Wilcox, (Wed Apr 16, 8:59 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 9:15 am)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Mon Apr 14, 2:09 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Mon Apr 14, 12:56 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 1:50 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 2:05 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 3:04 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Sat Apr 12, 2:01 pm)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Sat Apr 12, 2:43 am)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Sat Apr 12, 6:31 am)