From: Cliff Wickman <cpw@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>, jeremy@goop.org
Cc: steiner@sgi.com, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: Comments on UV tlb flushing
Date: Tue, 29 Jul 2008 08:32:04 -0500 [thread overview]
Message-ID: <20080729133204.GA13138@sgi.com> (raw)
In-Reply-To: <200807291412.18495.nickpiggin@yahoo.com.au>
On Tue, Jul 29, 2008 at 02:12:18PM +1000, Nick Piggin wrote:
> On Tuesday 29 July 2008 10:28, Jeremy Fitzhardinge wrote:
> > I'm just reworking the x86 tlb code to use smp_call_function_mask, and I
> > see how the UV tlb flushing hooks in. A few things occur to me:
> >
> > 1. There should be a CONFIG_X86_UV to select this code. tlb_uv.o is
> > around 6k, which is not trivial overhead to subject every x86_64
> > kernel to.
>
> Definitely.
I'd like to talk about this issue separate from the virtualization one.
I think that the Linux distributions are not going to build a special
UV kernel, are they? So every distro would have to be prompted to
turn on CONFIG_X86_UV, or else their kernel is not going to boot on UV.
But you have a point about not linking the 6k UV object file where
size is an issue.
Thanks for catching that.
Perhaps the UV code should be excluded if CONFIG_EMBEDDED is set.
-Cliff
next prev parent reply other threads:[~2008-07-29 13:32 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-29 0:28 Comments on UV tlb flushing Jeremy Fitzhardinge
2008-07-29 4:12 ` Nick Piggin
2008-07-29 6:26 ` Jeremy Fitzhardinge
2008-07-29 13:32 ` Cliff Wickman [this message]
2008-07-29 14:43 ` Jeremy Fitzhardinge
2008-07-29 17:34 ` Cliff Wickman
2008-07-29 17:46 ` Jeremy Fitzhardinge
2008-07-29 20:04 ` Cliff Wickman
2008-07-29 18:13 ` Yinghai Lu
2008-07-29 18:25 ` Jeremy Fitzhardinge
2008-07-29 18:45 ` Mike Travis
2008-07-29 19:12 ` Jeremy Fitzhardinge
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