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From: Suresh Siddha <suresh.b.siddha@intel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Jesse Barnes <jbarnes@virtuousgeek.org>,
	Jay Fenlason <fenlason@redhat.com>
Subject: Re: [patch 2/2] x86: arch specific support for remapping HPET MSIs
Date: Mon, 10 Aug 2009 09:58:36 -0700	[thread overview]
Message-ID: <1249923516.27006.10839.camel@localhost.localdomain> (raw)
In-Reply-To: <20090808151254.GC28892@elte.hu>

On Sat, 2009-08-08 at 08:12 -0700, Ingo Molnar wrote:
> * Suresh Siddha <suresh.b.siddha@intel.com> wrote:
> 
> > x86 arch support for remapping HPET MSI's by associating the HPET 
> > timer block with the interrupt-remapping HW unit and setting up 
> > appropriate irq_chip
> 
> interesting. This means we'd materially utilize the irq-remapper not 
> just on relatively obscure, virtualization related setups, but also 
> in the native x86 bootup mode, on all (hpet+remap capable) Linux 
> systems?

Ingo, For native linux kernel, interrupt-remapping allows simple and
reliable irq migration from the process context (in addition to  its
need for supporting cpu's capable of x2apic). And as such solves the
issues we had in the past with cpu hotplug and irq migration.

> I like it - but i'll defer to Thomas to queue it up.

thanks,
suresh


  parent reply	other threads:[~2009-08-10 17:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-04 19:07 [patch 1/2] intr-remap: generic " Suresh Siddha
2009-08-04 19:07 ` [patch 2/2] x86: arch specific " Suresh Siddha
2009-08-08 15:12   ` Ingo Molnar
2009-08-10 16:58     ` Jesse Barnes
2009-08-10 16:58     ` Suresh Siddha [this message]
2009-08-10 18:51       ` Ingo Molnar
2009-08-27 21:37   ` [tip:timers/hpet] " tip-bot for Suresh Siddha
2009-08-27 21:37 ` [tip:timers/hpet] intr-remap: generic " tip-bot for Suresh Siddha

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