From: Anton Blanchard <anton@samba.org>
To: Robert Love <rml@ximian.com>
Cc: Chris Friesen <cfriesen@nortelnetworks.com>,
Linux kernel <linux-kernel@vger.kernel.org>,
akpm@osdl.org
Subject: Re: status of PREEMPT and SMP together?
Date: Thu, 18 Mar 2004 10:36:57 +1100 [thread overview]
Message-ID: <20040317233657.GD28212@krispykreme> (raw)
In-Reply-To: <1079560828.1435.24.camel@localhost>
> Hrm, I thought I sent Anton a patch to fix that.
Sorry, I had planned to send it once Linus got over his deep freeze mode
but forgot. Here it is.
Now that the option is selectable I marked it BROKEN for the moment
since we havent got around to doing the low level exception bits yet...
Do you have a G5 yet? :)
> The comment is out of date. Technically speaking, the potential
> SMP+PREEMPT races exist on UP+PREEMPT, too.
>
> Running SMP+PREEMPT on a 4-way here :-)
--
From: Robert Love <rml@ximian.com>
arch/ppc64/Kconfig's entry for CONFIG_PREEMPT is missing the description
after the "bool" statement, so the entry does not show up.
Also, the help description mentions a restriction that is not [any
longer] true.
===== arch/ppc64/Kconfig 1.50 vs edited =====
--- 1.50/arch/ppc64/Kconfig Sun Mar 7 18:05:28 2004
+++ edited/arch/ppc64/Kconfig Thu Mar 18 10:33:17 2004
@@ -174,14 +179,12 @@
depends on DISCONTIGMEM
config PREEMPT
- bool
+ bool "Preemptible Kernel"
+ depends on BROKEN
help
This option reduces the latency of the kernel when reacting to
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.
- Unfortunately the kernel code has some race conditions if both
- CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
- currently disabled if you are building an SMP kernel.
Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.
next prev parent reply other threads:[~2004-03-17 23:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-17 21:30 Chris Friesen
2004-03-17 22:00 ` Robert Love
2004-03-17 23:36 ` Anton Blanchard [this message]
2004-03-18 0:24 ` Robert Love
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