From: Pavel Machek <pavel@suse.cz>
To: Ashok Raj <ashok.raj@intel.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [rfc] fix Kconfig, hotplug_cpu is needed for swsusp
Date: Thu, 30 Mar 2006 15:17:26 +0200 [thread overview]
Message-ID: <20060330131726.GV8485@elf.ucw.cz> (raw)
In-Reply-To: <20060330050005.A19403@unix-os.sc.intel.com>
Hi!
> here is an attempt to explain why...
>
> >
> > Something which remains to be beaten into my head: *why* does HOTPLUG_CPU
> > require flat pyhsical mode? What necessitated that change, and cannot we
> > make it work OK in logical mode as well as flat mode?
>
> Short answer
>
> 1. Will hotplug work today in logical flat mode without selecting bigsmp?
>
> Yes, since we avoid broadcast on i386 IPI's with no_broadcast option.
>
> 2. Why use bigsmp then?
> There is no reason to do the same thing in two different ways. i.e using
> logical flat with no_broadcast=1, or use the bigsmp by default when hotplug cpu is
> enabled. IOW we wanted the handling consistent with what we do for x86_64, hence the
> decision to use bigsmp automatically when hotplug is enabled or
> we notice >8 CPUS.
Why not make it even more consistent and just use bigsmp mode by
default, even for X86_PC? X86_BIGSMP would be reduntant, then...
Pavel
--
Picture of sleeping (Linux) penguin wanted...
next prev parent reply other threads:[~2006-03-30 13:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-29 22:08 [rfc] fix Kconfig, hotplug_cpu is needed for swsusp Pavel Machek
2006-03-29 22:47 ` Andrew Morton
2006-03-29 23:09 ` Ashok Raj
2006-03-29 23:36 ` Nigel Cunningham
2006-03-29 23:47 ` Ashok Raj
2006-03-29 23:53 ` Nigel Cunningham
2006-03-30 0:12 ` Ashok Raj
2006-03-30 0:32 ` Nigel Cunningham
2006-03-30 0:13 ` Andrew Morton
2006-03-30 0:18 ` Nigel Cunningham
2006-03-30 3:01 ` Nigel Cunningham
[not found] ` <20060330030657.GA10405@mars.ravnborg.org>
2006-03-30 10:11 ` Roman Zippel
2006-03-30 8:24 ` Jan Engelhardt
2006-04-04 5:15 ` menuconfig search (Re: [rfc] fix Kconfig, hotplug_cpu is needed for swsusp) Randy.Dunlap
2006-04-04 6:01 ` Alexey Dobriyan
2006-04-04 15:12 ` Randy.Dunlap
2006-04-08 8:42 ` Jan Engelhardt
2006-04-09 2:29 ` Randy.Dunlap
2006-04-11 11:18 ` Jan Engelhardt
2006-03-30 8:41 ` [rfc] fix Kconfig, hotplug_cpu is needed for swsusp Pavel Machek
2006-03-30 16:17 ` Rafael J. Wysocki
2006-03-29 0:30 ` Pavel Machek
2006-04-01 23:55 ` Ashok Raj
2006-03-30 3:24 ` Andrew Morton
2006-03-30 13:00 ` Ashok Raj
2006-03-30 13:17 ` Pavel Machek [this message]
2006-03-30 13:05 ` Eric W. Biederman
2006-03-30 8:30 ` Pavel Machek
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