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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060330131726.GV8485@elf.ucw.cz \
--to=pavel@suse.cz \
--cc=akpm@osdl.org \
--cc=ashok.raj@intel.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.