From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Christoph Lameter <clameter@sgi.com>, Ingo Molnar <mingo@elte.hu>,
LKML <linux-kernel@vger.kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Yasunori Goto <y-goto@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3 of 4] sparsemem: reduce i386 PAE section size
Date: Fri, 28 Mar 2008 11:05:11 -0700 [thread overview]
Message-ID: <47ED3357.7010608@goop.org> (raw)
In-Reply-To: <1206722599.7883.119.camel@nimitz.home.sr71.net>
Dave Hansen wrote:
>
> Developers should probably learn the tradeoffs before they go start
> poking around in code and sending patches. ;)
>
I don't know any better way of learning the tradeoffs than by poking
around and sending patches ;)
> BTW, the current 1G sections were picked because all the hardware we
> knew of at the time had 512MB dimms that had to be added in pairs. So,
> we didn't ever have physical hotplug of less than that.
>
I guessed it was something like that. Even for my case 1G isn't too
bad. It was bad when I was trying to hotplug early and it was having
allocation failures in the bootmem allocator, but I think it should be
OK now. On the other hand, when you're hotplugging new memory is
precisely when you don't want to be allocating lots of new memory...
J
next prev parent reply other threads:[~2008-03-28 18:05 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-28 0:28 [PATCH 0 of 4] [RFC] hotplug memory: minor updates Jeremy Fitzhardinge
2008-03-28 0:28 ` [PATCH 1 of 4] hotplug-memory: add add_memory_resource Jeremy Fitzhardinge
2008-03-28 0:28 ` [PATCH 2 of 4] hotplug-memory: adding non-section-aligned memory is bad Jeremy Fitzhardinge
2008-03-28 1:27 ` KAMEZAWA Hiroyuki
2008-03-28 1:34 ` Yasunori Goto
2008-03-28 1:54 ` KAMEZAWA Hiroyuki
2008-03-28 2:13 ` Jeremy Fitzhardinge
2008-03-28 2:33 ` KAMEZAWA Hiroyuki
2008-03-28 2:51 ` Jeremy Fitzhardinge
2008-03-28 3:17 ` KAMEZAWA Hiroyuki
2008-03-28 4:20 ` Jeremy Fitzhardinge
2008-03-28 4:39 ` KAMEZAWA Hiroyuki
2008-03-28 18:19 ` Jeremy Fitzhardinge
2008-03-28 18:27 ` Dave Hansen
2008-03-28 3:21 ` Yasunori Goto
2008-03-28 4:07 ` Jeremy Fitzhardinge
2008-03-28 21:30 ` Jeremy Fitzhardinge
2008-03-28 0:28 ` [PATCH 3 of 4] sparsemem: reduce i386 PAE section size Jeremy Fitzhardinge
2008-03-28 0:35 ` Christoph Lameter
2008-03-28 2:26 ` Jeremy Fitzhardinge
2008-03-28 2:27 ` Christoph Lameter
2008-03-28 6:18 ` Jeremy Fitzhardinge
2008-03-28 16:43 ` Dave Hansen
2008-03-28 18:05 ` Jeremy Fitzhardinge [this message]
2008-03-28 16:45 ` Dave Hansen
2008-03-28 0:28 ` [PATCH 4 of 4] paravirt_ops: don't steal memory resources in paravirt_disable_iospace Jeremy Fitzhardinge
2008-03-28 2:41 ` Rusty Russell
2008-03-28 9:12 ` [PATCH 0 of 4] [RFC] hotplug memory: minor updates Ingo Molnar
2008-03-28 16:07 ` Jeremy Fitzhardinge
2008-03-28 22:04 ` Ingo Molnar
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