linux-kernel - Re: [PATCH RFC] kvm: enable irq injection from interrupt context

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Message-ID: <20100916095310.GG20864@redhat.com>
Date:	Thu, 16 Sep 2010 11:53:10 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] kvm: enable irq injection from interrupt context

On Thu, Sep 16, 2010 at 11:46:03AM +0200, Avi Kivity wrote:
>  On 09/16/2010 11:25 AM, Gleb Natapov wrote:
> >>
> >>  MSI only appeared in rhel6, older guests still use level interrupts.
> >So they are already slow for other reasons.
> >
> 
> Exactly, for example they need to exit to userspace to ack the
> interrupt.  That's far slower than the workqueue.

Well, this is not exactly comparable: you might get
same irq asserted multiple times and only deasserted once.


> -- 
> error compiling committee.c: too many arguments to function
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