Re: [announce] "kill the Big Kernel Lock (BKL)" tree

view
thread

!MAILaRCHIVE_VOTE_RePLACE

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

To: Andi Kleen <andi@...>

Cc: Ingo Molnar <mingo@...>, <linux-kernel@...>, Linus Torvalds <torvalds@...>, Andrew Morton <akpm@...>, Peter Zijlstra <a.p.zijlstra@...>, Thomas Gleixner <tglx@...>, Alexander Viro <viro@...>

Subject: Re: [announce] "kill the Big Kernel Lock (BKL)" tree

Date: Wednesday, May 14, 2008 - 5:19 pm

> Most?

Yes

quoted text> 
> >of the legacy users inflict that locking on other code - eg the ISN
> > use of the BKL directly impacts on the tty layer work.
> 
> So you just stick unlock_kernel()/lock_kernel() around the call
> to TTY (or similar to the entry points)

It isn't that simple - I've spent a good deal of time working on it.
There are lots of paths that rely on interactions between modules. Eg we
found stuff racing between the pid structs tty internals and procfs that
happened to be saved by the BKL.

That in itself is a problem Ingo's stuff won't help with: We have lots of
"magic" accidental, undocumented and pot luck BKL locking semantics
between subsystems that are not even visible.
--
unsubscribe noticeTo unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:

[announce] "kill the Big Kernel Lock (BKL)" tree, Ingo Molnar, (Wed May 14, 1:49 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Linus Torvalds, (Thu May 15, 1:41 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Arjan van de Ven, (Thu May 15, 4:27 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Peter Zijlstra, (Thu May 15, 4:45 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Arjan van de Ven, (Thu May 15, 5:22 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Linus Torvalds, (Wed May 14, 2:41 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Ingo Molnar, (Wed May 14, 3:41 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Frederik Deweerdt, (Wed May 14, 4:05 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 2:30 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Wed May 14, 5:00 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 5:13 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, H. Peter Anvin, (Wed May 14, 5:16 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Wed May 14, 5:17 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Wed May 14, 5:19 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Linus Torvalds, (Wed May 14, 5:45 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 6:03 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Thu May 15, 9:34 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Thu May 15, 10:27 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Thu May 15, 11:36 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Fri May 16, 6:21 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Ingo Molnar, (Thu May 15, 4:02 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree , Jonathan Corbet, (Wed May 14, 5:45 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree , Jan Engelhardt, (Thu May 15, 4:44 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Diego Calleja, (Thu May 15, 10:54 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree , Linus Torvalds, (Wed May 14, 5:56 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree , Jonathan Corbet, (Wed May 14, 6:07 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Thu May 22, 4:20 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree , Linus Torvalds, (Wed May 14, 6:14 pm)

[PATCH, RFC] char dev BKL pushdown , Jonathan Corbet, (Fri May 16, 11:44 am)

Re: [PATCH, RFC] char dev BKL pushdown , Linus Torvalds, (Sat May 17, 5:58 pm)

Re: [PATCH, RFC] char dev BKL pushdown , Jonathan Corbet, (Sun May 18, 4:07 pm)

Re: [PATCH, RFC] char dev BKL pushdown , Linus Torvalds, (Fri May 16, 12:30 pm)

Re: [PATCH, RFC] char dev BKL pushdown , Jonathan Corbet, (Fri May 16, 12:43 pm)

Re: [PATCH, RFC] char dev BKL pushdown, Arnd Bergmann, (Sat May 17, 5:15 pm)

Re: [PATCH, RFC] char dev BKL pushdown , Jonathan Corbet, (Sun May 18, 4:26 pm)

Re: [PATCH, RFC] char dev BKL pushdown, Arnd Bergmann, (Mon May 19, 7:07 pm)

Re: [PATCH, RFC] char dev BKL pushdown , Jonathan Corbet, (Tue May 20, 11:13 am)

Re: [PATCH, RFC] char dev BKL pushdown, Arnd Bergmann, (Tue May 20, 1:21 pm)

Re: [PATCH, RFC] char dev BKL pushdown, Alan Cox, (Tue May 20, 2:51 pm)

[PATCH 1/3, RFC] misc char dev BKL pushdown, Arnd Bergmann, (Mon May 19, 7:26 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown, Mike Frysinger, (Tue May 20, 7:01 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown , Jonathan Corbet, (Tue May 20, 7:25 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown, Mike Frysinger, (Wed May 21, 12:22 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown, Alan Cox, (Tue May 20, 4:46 am)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown, Mike Frysinger, (Mon May 19, 8:07 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown , Jonathan Corbet, (Mon May 19, 8:21 pm)

Re: [PATCH 1/3, RFC] misc char dev BKL pushdown, Mike Frysinger, (Mon May 19, 8:46 pm)

[PATCH 3/3, RFC] remove BKL from misc_open(), Arnd Bergmann, (Mon May 19, 7:34 pm)

Re: [PATCH, RFC] char dev BKL pushdown, Alan Cox, (Fri May 16, 12:22 pm)

Re: [PATCH, RFC] char dev BKL pushdown, Christoph Hellwig, (Fri May 16, 11:49 am)

[PATCH] kill empty chardev open/release methods, Christoph Hellwig, (Fri May 16, 12:03 pm)

Re: [PATCH] kill empty chardev open/release methods, Alan Cox, (Fri May 16, 4:55 pm)

Re: [PATCH] kill empty chardev open/release methods , Jonathan Corbet, (Sun May 18, 3:46 pm)

Re: [PATCH] kill empty chardev open/release methods, Alan Cox, (Sun May 18, 3:58 pm)

Re: [PATCH] kill empty chardev open/release methods, Alan Cox, (Fri May 16, 12:24 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 6:11 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Linus Torvalds, (Wed May 14, 6:16 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 6:21 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Thu May 15, 9:30 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, John Stoffel, (Thu May 15, 11:05 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Thu May 15, 11:10 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, John Stoffel, (Thu May 15, 11:18 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Thu May 15, 11:45 am)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Wed May 14, 5:39 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Kevin Winchester, (Fri May 16, 8:14 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Kevin Winchester, (Fri May 16, 8:37 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Alan Cox, (Wed May 14, 5:46 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Linus Torvalds, (Wed May 14, 6:11 pm)

Re: [announce] "kill the Big Kernel Lock (BKL)" tree, Andi Kleen, (Wed May 14, 6:15 pm)

Navigation

Popular discussions


linux-kernel:
Greg Kroah-Hartman	[PATCH 002/196] Chinese: rephrase English introduction in HOWTO
Mark Lord	2.6.25-rc8: FTP transfer errors
Marcin Slusarz	Re: 2.6.25-rc2-mm1: build failure (x86)
Balbir Singh	Re: [RFC][PATCH 2/7] RSS controller core
git:

linux-activists:
bcpa	Binkley/Rfmaill/Cnews scripts?..
Rogier Wolff	Re: MIPS R3000 board to run Linux, anyone?
Gary Kahn	compiled ghostscript, got 2 megabyte executable
Joshua Lobel	Does anyone know anything about LOCUS' DOS MERGE running on Linux
linux-netdev:
Jarek Poplawski	[PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().
Gerrit Renker	[PATCH 27/37] dccp: Integration of dynamic feature activation - part 2 (server side)
David Miller	[GIT]: Networking
Andrew Morton	Re: [BUG] New Kernel Bugs

Colocation donated by:

Online users

Syndicate