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Re: [PATCH v2 2/2] xen/x86: ioapic: Bail out from timer_irq_works() as soon as possible
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Dec 2023 11:19:15 +0100
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- Cc: Julien Grall <jgrall@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 14 Dec 2023 10:19:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.12.2023 13:23, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> Currently timer_irq_works() will wait the full 100ms before checking
> that pit0_ticks has been incremented at least 4 times.
>
> However, the bulk of the BIOS/platform should not have a buggy timer.
> So waiting for the full 100ms is a bit harsh.
>
> Rework the logic to only wait until 100ms passed or we saw more than
> 4 ticks. So now, in the good case, this will reduce the wait time
> to ~50ms.
Isn't this more like 40ms (4 ticks 10ms apart)? And really somewhere
between 30 and 40, because the first tick has already partly elapsed?
> Take the opportunity to change the prototype of timer_irq_works() to
> return a bool rather than int (which was already acting as a bool because
> only 0/1 could be returned).
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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