From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wl@xen.org>,
Claudemir Todo Bom <claudemir@todobom.com>
Subject: Re: [PATCH v2 1/3] x86/time: change initiation of the calibration timer
Date: Fri, 5 Feb 2021 17:00:55 +0100 [thread overview]
Message-ID: <YB1rt1LNXuhpQNZC@Air-de-Roger> (raw)
In-Reply-To: <ca624e2e-5a2c-e2a6-6e26-54bc3ac7cc19@suse.com>
On Mon, Feb 01, 2021 at 01:42:35PM +0100, Jan Beulich wrote:
> Setting the timer a second (EPOCH) into the future at a random point
> during boot (prior to bringing up APs and prior to launching Dom0) does
> not yield predictable results: The timer may expire while we're still
> bringing up APs (too early) or when Dom0 already boots (too late).
> Instead invoke the timer handler function explicitly at a predictable
> point in time, once we've established the rendezvous function to use
> (and hence also once all APs are online). This will, through the raising
> and handling of TIMER_SOFTIRQ, then also have the effect of arming the
> timer.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Thanks, Roger.
next prev parent reply other threads:[~2021-02-05 16:01 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 12:41 [PATCH v2 0/3] x86/time: calibration rendezvous adjustments Jan Beulich
2021-02-01 12:42 ` [PATCH v2 1/3] x86/time: change initiation of the calibration timer Jan Beulich
2021-02-05 16:00 ` Roger Pau Monné [this message]
2021-02-01 12:43 ` [PATCH v2 2/3] x86/time: adjust time recording time_calibration_tsc_rendezvous() Jan Beulich
2021-02-05 16:15 ` Roger Pau Monné
2021-02-08 10:56 ` Jan Beulich
2021-02-08 11:05 ` Roger Pau Monné
2021-02-08 11:50 ` Jan Beulich
2021-02-08 16:39 ` Roger Pau Monné
2021-02-01 12:43 ` [PATCH v2 3/3] x86/time: don't move TSC backwards in time_calibration_tsc_rendezvous() Jan Beulich
2021-02-02 8:16 ` Jan Beulich
2021-02-08 9:38 ` Roger Pau Monné
2021-02-08 11:22 ` Jan Beulich
2021-02-08 13:19 ` Roger Pau Monné
2021-02-08 13:59 ` Jan Beulich
2021-02-08 16:33 ` Roger Pau Monné
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