From: Jan Kiszka <jan.kiszka@siemens.com>
To: R <19890121wr@gmail.com>
Cc: Arthur Chunqi Li <yzt356@gmail.com>, kvm <kvm@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: About preemption timer
Date: Wed, 18 Dec 2013 07:58:17 +0100 [thread overview]
Message-ID: <52B14789.1000201@siemens.com> (raw)
In-Reply-To: <CAF2sySOqdW0SimGpn-N2UH0H8ksce5D39VVcbdX9=FjOhwABQw@mail.gmail.com>
On 2013-12-18 04:27, R wrote:
> Hi,
>
> You must adjust the preemption timer according to the eclipsed time
> when the guest runs.
>
> And register a hrtimer triggered when a guest exit.
> The timer should be alarmed when the remaining time runs out,
In fact, as we need to register an hrtimer anyway when leaving the
guest, we can simply register it always and stop using the physical
preemption timer. This will also solve the breakage on older Intel CPU,
actually it will add preemption timer support unconditionally.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2013-12-18 6:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-17 9:32 About preemption timer Arthur Chunqi Li
2013-12-17 11:21 ` Jan Kiszka
2013-12-17 11:31 ` Arthur Chunqi Li
2013-12-17 12:43 ` Jan Kiszka
2013-12-17 12:59 ` Arthur Chunqi Li
2013-12-17 15:17 ` Jan Kiszka
2013-12-18 3:27 ` R
2013-12-18 6:58 ` Jan Kiszka [this message]
2013-12-17 11:22 ` Paolo Bonzini
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