From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>,
steven.sistare@oracle.com, daniel.m.jordan@oracle.com,
linux@armlinux.org.uk, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, john.stultz@linaro.org,
sboyd@codeaurora.org, x86@kernel.org,
linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com,
douly.fnst@cn.fujitsu.com, prarit@redhat.com,
feng.tang@intel.com, pmladek@suse.com,
gnomes@lxorguk.ukuu.org.uk
Subject: Re: [PATCH v10 1/7] x86/tsc: remove tsc_disabled flag
Date: Tue, 19 Jun 2018 22:01:15 +0200 [thread overview]
Message-ID: <20180619200115.GH2494@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.21.1806192110230.10546@nanos.tec.linutronix.de>
On Tue, Jun 19, 2018 at 09:12:45PM +0200, Thomas Gleixner wrote:
> On Tue, 19 Jun 2018, Peter Zijlstra wrote:
> > It does not; there is TSC usage even if you boot with notsc on. See how
> > it does not clear X86_FEATURE_TSC for instance.
>
> Well, kinda. There is some stuff in the apic calibration which uses TSC
> independent of tsc_disabled, but that's about it.
Still, that precludes booting on hardware without TSC, so what's the
point of having notsc? I'm all for killing the thing.
next prev parent reply other threads:[~2018-06-19 20:01 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-15 17:41 [PATCH v10 0/7] Early boot time stamps for x86 Pavel Tatashin
2018-06-15 17:41 ` [PATCH v10 1/7] x86/tsc: remove tsc_disabled flag Pavel Tatashin
2018-06-19 17:32 ` Thomas Gleixner
2018-06-19 17:50 ` Pavel Tatashin
2018-06-19 18:46 ` Peter Zijlstra
2018-06-19 19:12 ` Thomas Gleixner
2018-06-19 20:01 ` Peter Zijlstra [this message]
2018-06-19 20:57 ` Thomas Gleixner
2018-06-19 21:00 ` Peter Zijlstra
2018-06-15 17:41 ` [PATCH v10 2/7] time: sync read_boot_clock64() with persistent clock Pavel Tatashin
2018-06-19 21:14 ` Thomas Gleixner
2018-06-19 21:25 ` Pavel Tatashin
2018-06-15 17:42 ` [PATCH v10 3/7] x86/time: read_boot_clock64() implementation Pavel Tatashin
2018-06-18 8:42 ` Andy Shevchenko
2018-06-18 8:44 ` Andy Shevchenko
2018-06-19 14:23 ` Pavel Tatashin
2018-06-19 20:39 ` Andy Shevchenko
2018-06-15 17:42 ` [PATCH v10 4/7] sched: early boot clock Pavel Tatashin
2018-06-15 17:42 ` [PATCH v10 5/7] kvm/x86: remove kvm memblock dependency Pavel Tatashin
2018-06-15 17:42 ` [PATCH v10 6/7] x86/paravirt: add active_sched_clock to pv_time_ops Pavel Tatashin
2018-06-19 23:13 ` Thomas Gleixner
2018-06-15 17:42 ` [PATCH v10 7/7] x86/tsc: use tsc early Pavel Tatashin
2018-06-19 22:51 ` Thomas Gleixner
2018-06-19 23:20 ` Thomas Gleixner
2018-06-19 23:52 ` Thomas Gleixner
2018-06-20 0:00 ` Pavel Tatashin
2018-06-20 9:15 ` Peter Zijlstra
2018-06-20 10:42 ` Thomas Gleixner
2018-06-20 12:32 ` Peter Zijlstra
2018-06-20 13:29 ` Thomas Gleixner
2018-06-20 21:30 ` Pavel Tatashin
2018-06-20 10:12 ` Feng Tang
2018-06-20 10:16 ` Thomas Gleixner
2018-06-20 10:29 ` Feng Tang
2018-06-20 10:30 ` Thomas Gleixner
2018-06-20 10:39 ` Feng Tang
-- strict thread matches above, loose matches on Subject: below --
2018-02-09 21:11 [PATCH v10 0/7] Early boot time stamps for x86 Pavel Tatashin
2018-02-09 21:11 ` [PATCH v10 1/7] x86/tsc: remove tsc_disabled flag Pavel Tatashin
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