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>,
Julien Grall <julien@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>,
Anthony PERARD <anthony.perard@vates.tech>,
Michal Orzel <michal.orzel@amd.com>
Subject: Re: [PATCH v2 2/4] time: shorten year determination loop
Date: Tue, 28 Jul 2026 17:02:54 +0200 [thread overview]
Message-ID: <amjEnux2uyhYL-pu@macbook.local> (raw)
In-Reply-To: <7bed7164-9a53-4e53-9fc1-7af68108bdf8@suse.com>
On Thu, Jul 02, 2026 at 11:30:11AM +0200, Jan Beulich wrote:
> For dates very far into the future (the MC146818 RTC's century byte can go
> up to the 99th century), the present year-wise loop would become somewhat
> inefficient (taking perhaps several thousand iterations). Prefix that loop
> with a 400-year granular calculation (somewhat like the earlier loop does
> for dates in the past).
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger@xenproject.org>
Thanks, Roger.
next prev parent reply other threads:[~2026-07-28 15:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-02 9:25 [PATCH v2 0/4] x86/time: CMOS RTC century byte Jan Beulich
2026-07-02 9:29 ` [PATCH v2 1/4] x86/time: CMOS RTC may run in binary mode Jan Beulich
2026-07-28 14:25 ` Roger Pau Monné
2026-07-02 9:30 ` [PATCH v2 2/4] time: shorten year determination loop Jan Beulich
2026-07-28 15:02 ` Roger Pau Monné [this message]
2026-07-02 9:30 ` [PATCH v2 3/4] x86/vRTC: the use_timer field is a boolean one Jan Beulich
2026-07-29 7:47 ` Roger Pau Monné
2026-07-02 9:31 ` [PATCH v2 4/4] x86/vRTC: support century field Jan Beulich
2026-07-29 8:45 ` Roger Pau Monné
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