All of lore.kernel.org
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Florian Weimer <fweimer@redhat.com>,
	Juergen Gross <jgross@suse.com>, Arnd Bergmann <arnd@arndb.de>,
	Stephen Boyd <sboyd@kernel.org>, X86 ML <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux Virtualization <virtualization@lists.linux-foundation.org>,
	John Stultz <john.stultz@linaro.org>,
	Andy Lutomirski <luto@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	devel@linuxdriverproject.org, Matt Rickard <matt@softrans.com.au>
Subject: Re: [patch 09/11] x86/vdso: Simplify the invalid vclock case
Date: Tue, 18 Sep 2018 17:52:54 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1809181731570.7302__40776.0506299839$1537285903$gmane$org@nanos.tec.linutronix.de> (raw)
In-Reply-To: <alpine.DEB.2.21.1809181515170.6950@nanos.tec.linutronix.de>

On Tue, 18 Sep 2018, Thomas Gleixner wrote:
> So if the TSC on CPU1 is slightly behind the TSC on CPU0 then now1 can be
> smaller than cycle_last. The TSC sync stuff does not catch the small delta
> for unknown raisins. I'll go and find that machine and test that again.

Of course it does not trigger anymore. We accumulated code between the
point in timekeeping_advance() where the TSC is read and the update of the
VDSO data.

I'll might have to get an 2.6ish kernel booted on that machine and try with
that again. /me shudders

Thanks,

	tglx

  parent reply	other threads:[~2018-09-18 15:52 UTC|newest]

Thread overview: 157+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-14 12:50 [patch 00/11] x86/vdso: Cleanups, simmplifications and CLOCK_TAI support Thomas Gleixner
2018-09-14 12:50 ` [patch 01/11] clocksource: Provide clocksource_arch_init() Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 02/11] x86/time: Implement clocksource_arch_init() Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 15:45   ` Vitaly Kuznetsov
2018-09-14 15:45   ` Vitaly Kuznetsov
2018-09-15  6:05     ` Thomas Gleixner
2018-09-15  6:05     ` Thomas Gleixner
2018-09-14 12:50 ` [patch 03/11] x86/vdso: Enforce 64bit clocksource Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 04/11] x86/vdso: Use unsigned int consistently for vsyscall_gtod_data::seq Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 05/11] x86/vdso: Introduce and use vgtod_ts Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 06/11] x86/vdso: Collapse high resolution functions Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 07/11] x86/vdso: Collapse coarse functions Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 08/11] x86/vdso: Replace the clockid switch case Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 09/11] x86/vdso: Simplify the invalid vclock case Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-17 19:25   ` Andy Lutomirski
2018-09-17 19:25     ` Andy Lutomirski
2018-09-17 20:12     ` John Stultz
2018-09-18  7:52       ` Thomas Gleixner
2018-09-18  8:30         ` Peter Zijlstra
2018-09-18  8:30           ` Peter Zijlstra
2018-09-18  8:52           ` Thomas Gleixner
2018-09-18  8:52           ` Thomas Gleixner
2018-09-18 10:06             ` Thomas Gleixner
2018-09-18 10:41               ` Thomas Gleixner
2018-09-18 10:41               ` Thomas Gleixner
2018-09-18 12:48                 ` Peter Zijlstra
2018-09-18 12:48                   ` Peter Zijlstra
2018-09-18 13:23                   ` Thomas Gleixner
2018-09-18 13:23                   ` Thomas Gleixner
2018-09-18 13:38                     ` Peter Zijlstra
2018-09-18 13:38                       ` Peter Zijlstra
2018-09-18 15:52                     ` Thomas Gleixner
2018-09-27 14:41                       ` Thomas Gleixner
2018-09-27 14:41                       ` Thomas Gleixner
2018-09-18 15:52                     ` Thomas Gleixner [this message]
2018-09-18 10:06             ` Thomas Gleixner
2018-09-18 14:01         ` Andy Lutomirski
2018-09-18 14:01         ` Andy Lutomirski
2018-09-18 22:46           ` Thomas Gleixner
2018-09-18 23:03             ` Andy Lutomirski
2018-09-18 23:03             ` Andy Lutomirski
2018-09-18 23:16               ` Thomas Gleixner
2018-09-18 23:16               ` Thomas Gleixner
2018-09-27 14:36                 ` Thomas Gleixner
2018-09-27 14:39                   ` Andy Lutomirski
2018-09-27 14:39                   ` Andy Lutomirski
2018-09-27 14:36                 ` Thomas Gleixner
2018-09-19  9:08             ` Rasmus Villemoes
2018-09-19 13:29               ` Thomas Gleixner
2018-09-19 13:29               ` Thomas Gleixner
2018-09-18 22:46           ` Thomas Gleixner
2018-09-18  7:52       ` Thomas Gleixner
2018-09-14 12:50 ` [patch 10/11] x86/vdso: Move cycle_last handling into the caller Thomas Gleixner
2018-09-14 15:26   ` Vitaly Kuznetsov
2018-09-14 15:26   ` Vitaly Kuznetsov
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 12:50 ` [patch 11/11] x66/vdso: Add CLOCK_TAI support Thomas Gleixner
2018-09-14 12:50 ` Thomas Gleixner
2018-09-14 14:04   ` Andy Lutomirski
2018-09-14 14:04   ` Andy Lutomirski
2018-09-14 14:27     ` Thomas Gleixner
2018-09-14 14:27     ` Thomas Gleixner
2018-09-14 14:59       ` Andy Lutomirski
2018-09-14 14:59       ` Andy Lutomirski
2018-09-16  9:39         ` Thomas Gleixner
2018-09-16  9:39         ` Thomas Gleixner
2018-09-14 12:56 ` [patch 00/11] x86/vdso: Cleanups, simmplifications and " Florian Weimer
2018-09-14 13:05   ` Thomas Gleixner
2018-09-14 13:06     ` Florian Weimer
2018-09-14 13:19       ` Thomas Gleixner
2018-09-14 13:19       ` Thomas Gleixner
2018-09-14 13:05   ` Thomas Gleixner
2018-09-14 13:09   ` Peter Zijlstra
2018-09-14 13:09   ` Peter Zijlstra
2018-09-14 14:22 ` Arnd Bergmann
2018-09-17 13:00   ` Thomas Gleixner
2018-09-17 13:00   ` Thomas Gleixner
2018-09-24 21:08     ` Arnd Bergmann
2018-09-24 21:08     ` Arnd Bergmann
2018-09-14 14:22 ` Arnd Bergmann
2018-10-03  5:15 ` Andy Lutomirski
2018-10-03  5:15   ` Andy Lutomirski
2018-10-03  9:22   ` Vitaly Kuznetsov
2018-10-03  9:22   ` Vitaly Kuznetsov
2018-10-03 10:20     ` Andy Lutomirski
2018-10-03 10:20       ` Andy Lutomirski
2018-10-03 12:01       ` Vitaly Kuznetsov
2018-10-03 12:01       ` Vitaly Kuznetsov
2018-10-03 14:20         ` Andy Lutomirski
2018-10-03 14:20         ` Andy Lutomirski
2018-10-03 15:10           ` Thomas Gleixner
2018-10-03 15:10           ` Thomas Gleixner
2018-10-03 16:18             ` Andy Lutomirski
2018-10-03 16:18             ` Andy Lutomirski
2018-10-03 19:06     ` Marcelo Tosatti
2018-10-04  7:54       ` Vitaly Kuznetsov
2018-10-04  8:11         ` Peter Zijlstra
2018-10-04 14:00           ` Andy Lutomirski
2018-10-04 14:00           ` Andy Lutomirski
2018-10-04 19:31             ` Peter Zijlstra
2018-10-04 19:31             ` Peter Zijlstra
2018-10-04 20:05               ` Andy Lutomirski
2018-10-04 20:05               ` Andy Lutomirski
2018-10-04 22:15                 ` Andy Lutomirski
2018-10-04 22:15                   ` Andy Lutomirski
2018-10-06 20:27                   ` Marcelo Tosatti
2018-10-06 20:27                     ` Marcelo Tosatti
2018-10-06 22:28                     ` Andy Lutomirski
2018-10-06 22:28                     ` Andy Lutomirski
2018-10-08 15:26                       ` Marcelo Tosatti
2018-10-08 15:26                       ` Marcelo Tosatti
2018-10-08 17:38                         ` Andy Lutomirski
2018-10-08 17:38                         ` Andy Lutomirski
2018-10-08 19:36                           ` Marcelo Tosatti
2018-10-08 19:36                           ` Marcelo Tosatti
2018-10-09 20:09                             ` Andy Lutomirski
2018-10-09 20:09                             ` Andy Lutomirski
2018-10-11 22:27                               ` Marcelo Tosatti
2018-10-11 22:27                                 ` Marcelo Tosatti
2018-10-11 23:00                                 ` Andy Lutomirski
2018-10-11 23:00                                   ` Andy Lutomirski
2018-10-15 13:39                                   ` Marcelo Tosatti
2018-10-15 13:39                                   ` Marcelo Tosatti
2018-10-06 20:49                   ` Marcelo Tosatti
2018-10-06 20:49                   ` Marcelo Tosatti
2018-10-04  8:11         ` Peter Zijlstra
2018-10-04 12:00         ` Paolo Bonzini
2018-10-04 14:04           ` Andy Lutomirski
2018-10-04 14:04             ` Andy Lutomirski
2018-10-04 12:00         ` Paolo Bonzini
2018-10-05 21:18         ` Marcelo Tosatti
2018-10-05 21:18         ` Marcelo Tosatti
2018-10-04  7:54       ` Vitaly Kuznetsov
2018-10-03 19:06     ` Marcelo Tosatti
2018-10-03 19:00   ` Marcelo Tosatti
2018-10-03 19:00   ` Marcelo Tosatti
2018-10-03 19:05     ` [patch 00/11] x86/vdso: Cleanups, simmplifications and CLOCK_TAI support\ Marcelo Tosatti
2018-10-03 19:05       ` Marcelo Tosatti
2018-10-03 22:32     ` [patch 00/11] x86/vdso: Cleanups, simmplifications and CLOCK_TAI support Andy Lutomirski
2018-10-03 22:32       ` Andy Lutomirski
2018-10-04 16:37       ` Marcelo Tosatti
2018-10-04 16:37       ` Marcelo Tosatti
2018-10-04 17:08         ` Andy Lutomirski
2018-10-04 17:28           ` Vitaly Kuznetsov
2018-10-04 17:28             ` Vitaly Kuznetsov
2018-10-04 17:08         ` Andy Lutomirski
2018-10-04 20:32 ` Andy Lutomirski
2018-10-04 20:32   ` Andy Lutomirski

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='alpine.DEB.2.21.1809181731570.7302__40776.0506299839$1537285903$gmane$org@nanos.tec.linutronix.de' \
    --to=tglx@linutronix.de \
    --cc=arnd@arndb.de \
    --cc=devel@linuxdriverproject.org \
    --cc=fweimer@redhat.com \
    --cc=jgross@suse.com \
    --cc=john.stultz@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=matt@softrans.com.au \
    --cc=pbonzini@redhat.com \
    --cc=peterz@infradead.org \
    --cc=sboyd@kernel.org \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.