From: Paolo Bonzini <pbonzini@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>,
Marcelo Tosatti <mtosatti@redhat.com>
Cc: Owen Hofmann <osh@google.com>, KVM General <kvm@vger.kernel.org>,
Peter Hornyack <peterhornyack@google.com>,
Joao Martins <joao.m.martins@oracle.com>
Subject: Re: What time is it kvm-clock?
Date: Wed, 24 Feb 2016 20:44:43 +0100 [thread overview]
Message-ID: <56CE082B.3020102@redhat.com> (raw)
In-Reply-To: <CALCETrUzcANkDt2w_4pQDjyaSxUVBY6nyHEFSXgF2M7_hybrxQ@mail.gmail.com>
On 24/02/2016 20:38, Andy Lutomirski wrote:
> If the master clock accurately exposed CLOCK_MONOTONIC_RAW or
> CLOCK_MONOTONIC (I much prefer the latter), then it would be fine
> across suspend/resume.
Here we already have a conflict... Owen says he prefers the master clock
to expose the (stable) TSC, you say you prefer CLOCK_MONOTONIC.
I for one _thought_ CLOCK_MONOTONIC would have been my choice, but I'm
not so sure about it and I'm also not sure it's possible to do it
efficiently. The mult/shift/offset tuple potentially can change every
tick, and it would be bad to do such an update #vms times per tick (or
worse, #vcpus times per tick).
Paolo
next prev parent reply other threads:[~2016-02-24 19:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-24 2:31 What time is it kvm-clock? Owen Hofmann
2016-02-24 3:57 ` Marcelo Tosatti
2016-02-24 17:35 ` Peter Hornyack
2016-02-24 20:17 ` Radim Krčmář
2016-02-24 20:24 ` Andy Lutomirski
2016-02-24 20:53 ` Radim Krčmář
2016-02-25 11:13 ` Radim Krčmář
2016-02-25 11:22 ` Marcelo Tosatti
2016-02-24 23:35 ` Marcelo Tosatti
2016-02-24 23:36 ` Marcelo Tosatti
2016-02-25 1:19 ` Andy Lutomirski
2016-02-25 3:50 ` Owen Hofmann
2016-02-25 12:20 ` Radim Krčmář
2016-02-26 17:02 ` Andy Lutomirski
2016-02-26 19:30 ` Marcelo Tosatti
2016-02-27 0:00 ` Andy Lutomirski
2016-02-25 11:36 ` Radim Krčmář
2016-02-25 12:12 ` Marcelo Tosatti
2016-02-24 3:59 ` Marcelo Tosatti
2016-02-24 14:14 ` Paolo Bonzini
2016-02-24 16:44 ` Andy Lutomirski
2016-02-24 17:38 ` Marcelo Tosatti
2016-02-24 19:38 ` Andy Lutomirski
2016-02-24 19:44 ` Paolo Bonzini [this message]
2016-02-24 19:52 ` Andy Lutomirski
2016-02-24 19:55 ` Owen Hofmann
2016-02-25 12:22 ` Joao Martins
2016-02-25 12:22 ` Joao Martins
2016-02-26 15:04 ` Marcelo Tosatti
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