From: Frank Mehnert <Frank.Mehnert@Sun.COM>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Avi Kivity <avi@redhat.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: PFs on pages pinned with get_user_pages()
Date: Thu, 29 Jan 2009 17:03:35 +0100 [thread overview]
Message-ID: <200901291703.35463.frank.mehnert@sun.com> (raw)
In-Reply-To: <1233240757.4495.94.camel@laptop>
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On Thursday 29 January 2009, Peter Zijlstra wrote:
> > > That aside, is there any reason you have to avoid scheduling? Otherwise
> > > I would just allow so and be done with it.
> >
> > The reason is that our code expects that to ensure syncing of the CPU
> > state with the saved state. I fear it is quite difficult to change
> > that...
>
> Ah, is that what KVM uses the preempt notifiers for? Could you too?
Right, that could be an option.
We will try to change our code which is a big effort as we try
to keep the code as unique as possible between the different
hosts we support (Linux, Solaris, Windows, Mac OS X).
Just to be sure: There is no other option than disabling interrupts
or calling disable_preemption() to prevent scheduling?
Kind regards,
Frank
--
Dr.-Ing. Frank Mehnert Sun Microsystems http://www.sun.com/
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next prev parent reply other threads:[~2009-01-29 16:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-29 8:05 Frank Mehnert
2009-01-29 12:28 ` Peter Zijlstra
2009-01-29 13:08 ` Frank Mehnert
2009-01-29 13:43 ` Peter Zijlstra
2009-01-29 14:02 ` Frank Mehnert
2009-01-29 14:20 ` Peter Zijlstra
2009-01-29 14:41 ` Frank Mehnert
2009-01-29 14:52 ` Peter Zijlstra
2009-01-29 16:03 ` Frank Mehnert [this message]
2009-01-29 16:11 ` Peter Zijlstra
2009-01-30 10:34 ` Frank Mehnert
2009-01-30 10:45 ` Peter Zijlstra
2009-01-29 14:56 ` [PATCH] x86: add might_sleep() to do_page_fault() Peter Zijlstra
2009-01-29 14:59 ` Ingo Molnar
2009-01-29 15:02 ` [PATCH v2] " Peter Zijlstra
2009-01-29 15:03 ` Ingo Molnar
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