From: Joao Martins <joao.m.martins@oracle.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH v3 3/6] x86/time: streamline platform time init on plt_update()
Date: Mon, 12 Sep 2016 11:35:00 +0100 [thread overview]
Message-ID: <57D684D4.4020206@oracle.com> (raw)
In-Reply-To: <57D674AD020000780010DDA9@prv-mh.provo.novell.com>
On 09/12/2016 08:26 AM, Jan Beulich wrote:
>>>> On 09.09.16 at 18:32, <joao.m.martins@oracle.com> wrote:
>> Would that sound reasonable - am I overlooking something? To some extent this
>> might also applicable to the general case, although platform timer is now only
>> used for initial seeding so probably a non-visible issue.
>
> Wouldn't it already help to simply make TSC a 62- or 63-bit counter,
> masking off the high bit(s) during reads?
Yeap - That indeed would be the simplest solution, as we currently mask out the
difference between stamps. Tested it and changed counter_bits to be 63 (amended
in patch 2).
Joao
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next prev parent reply other threads:[~2016-09-12 10:33 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-24 12:43 [PATCH v3 0/6] x86/time: PVCLOCK_TSC_STABLE_BIT support Joao Martins
2016-08-24 12:43 ` [PATCH v3 1/6] x86/time: refactor init_platform_time() Joao Martins
2016-08-25 10:03 ` Jan Beulich
2016-08-26 14:54 ` Joao Martins
2016-08-24 12:43 ` [PATCH v3 2/6] x86/time: implement tsc as clocksource Joao Martins
2016-08-25 10:06 ` Jan Beulich
2016-08-26 15:11 ` Joao Martins
2016-08-29 9:36 ` Jan Beulich
2016-08-30 12:08 ` Joao Martins
2016-08-30 12:30 ` Jan Beulich
2016-08-30 13:59 ` Joao Martins
2016-08-24 12:43 ` [PATCH v3 3/6] x86/time: streamline platform time init on plt_update() Joao Martins
2016-08-25 10:13 ` Jan Beulich
2016-08-26 15:12 ` Joao Martins
2016-08-29 9:41 ` Jan Beulich
2016-08-30 12:10 ` Joao Martins
2016-08-30 12:31 ` Jan Beulich
2016-09-09 16:32 ` Joao Martins
2016-09-12 7:26 ` Jan Beulich
2016-09-12 10:35 ` Joao Martins [this message]
2016-08-24 12:43 ` [PATCH v3 4/6] x86/time: refactor read_platform_stime() Joao Martins
2016-08-25 10:17 ` Jan Beulich
2016-08-26 15:13 ` Joao Martins
2016-08-29 9:42 ` Jan Beulich
2016-08-24 12:43 ` [PATCH v3 5/6] x86/time: implement PVCLOCK_TSC_STABLE_BIT Joao Martins
2016-08-25 10:37 ` Jan Beulich
2016-08-26 15:44 ` Joao Martins
2016-08-29 10:06 ` Jan Beulich
2016-08-30 12:26 ` Joao Martins
2016-08-30 12:45 ` Jan Beulich
2016-08-30 14:14 ` Joao Martins
2016-08-24 12:43 ` [PATCH v3 6/6] docs: update clocksource option Joao Martins
2016-08-25 10:38 ` Jan Beulich
2016-08-26 15:13 ` Joao Martins
2016-08-24 12:50 ` [PATCH v3 0/6] x86/time: PVCLOCK_TSC_STABLE_BIT support Joao Martins
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