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From: Dmitry Safonov <0x7f454c46@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@redhat.com>
Cc: Dmitry Safonov <dima@arista.com>, Andrei Vagin <avagin@gmail.com>,
	open list <linux-kernel@vger.kernel.org>,
	Adrian Reber <adrian@lisas.de>, Andrei Vagin <avagin@openvz.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Cyrill Gorcunov <gorcunov@openvz.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Jann Horn <jannh@google.com>,
	Jeff Dike <jdike@addtoit.com>, Oleg Nesterov <oleg@redhat.com>,
	Pavel Emelyanov <xemul@virtuozzo.com>,
	Shuah Khan <shuah@kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Linux Containers <containers@lists.linux-foundation.org>,
	crml <criu@openvz.org>, Linux API <linux-api@vger.kernel.org>,
	X86 ML <x86@kernel.org>
Subject: Re: [PATCHv8 00/34] kernel: Introduce Time Namespace
Date: Wed, 11 Dec 2019 20:38:30 +0000	[thread overview]
Message-ID: <CAJwJo6ahGVHHgwFsPyjbY1PgmHs+D+A2Cma03ogvQGr+mPqYAw@mail.gmail.com> (raw)
In-Reply-To: <20191121180555.GA440967@gmail.com>

Gentle ping, in case you have time to look at this.

On Thu, 21 Nov 2019 at 18:05, Andrei Vagin <avagin@gmail.com> wrote:
>
> Hi Thomas,
>
> What is your plan on this series? We know you are probably busy with
> the next merge window. We just want to check that this is still in your
> TODO list.
>
> On Tue, Nov 12, 2019 at 01:26:49AM +0000, Dmitry Safonov wrote:
> >
> > v7..v8 Changes:
> > * Fix compile-time errors:
> >   - on architectures without the support of time namespaces.
> >   - when CONFIG_POSIX_TIMERS isn't set.
> > * Added checks in selftests for CONFIG_POSIX_TIMERS.
> > * Inline do_hres and do_coarse.
> >   (And added Tested-by Vincenzo - thanks!)
> > * Make TIME_NS depends on GENERIC_VDSO_TIME_NS and set it per-arch.
> >
> > [v1..v7 Changelogs is at the very bottom here]
> >
> > Our performance measurements show that the price of VDSO's clock_gettime()
> > in a child time namespace is about 8% with a hot CPU cache and about 90%
>
> Here is a typo. The price of VDSO's clock_gettime() in a child time
> namespace is about 12% with a cold CPU cache. The table with
> measurements for a cold CPU cache contains correct data.
>
> > with a cold CPU cache. There is no performance regression for host
> > processes outside time namespace on those tests.
> >
>
> ....
>
> >
> > Cold CPU cache (lesser tsc per cycle - the better):
> >
> >            | before    | CONFIG_TIME_NS=n | host      | inside timens
> > --------------------------------------------------------------
> > tsc        | 476       | 480              | 487       | 531
> > stdev(tsc) | 0.6       | 1.3              | 4.3       | 5.7
> > diff (%)   | 100       | 100.9            | 102       | 112
> >

Thanks,
             Dmitry

  reply	other threads:[~2019-12-11 20:38 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-12  1:26 [PATCHv8 00/34] kernel: Introduce Time Namespace Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 01/34] lib/vdso: Add unlikely() hint into vdso_read_begin() Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 02/34] lib/vdso: make do_hres and do_coarse as __always_inline Dmitry Safonov
     [not found]   ` <20191112012724.250792-3-dima-nzgTgzXrdUbQT0dZR+AlfA@public.gmane.org>
2020-01-10  9:45     ` Vincenzo Frascino
2020-01-10 11:42       ` Thomas Gleixner
     [not found]         ` <878smfa66i.fsf-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2020-01-10 11:47           ` Vincenzo Frascino
2020-01-10 12:02             ` Thomas Gleixner
     [not found]               ` <875zhja59q.fsf-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2020-01-10 12:18                 ` Vincenzo Frascino
2020-01-13  5:27               ` Andrei Vagin
2019-11-12  1:26 ` [PATCHv8 03/34] ns: Introduce Time Namespace Dmitry Safonov
     [not found]   ` <20191112012724.250792-4-dima-nzgTgzXrdUbQT0dZR+AlfA@public.gmane.org>
2020-01-27 14:12     ` Dmitry Vyukov
     [not found]       ` <CACT4Y+b70bRRS2XD3yxhBoy4E-LFy_K3wMrjeuPmiEvaPe_c2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-01-27 14:19         ` Dmitry Safonov
2020-02-17 14:20   ` Time Namespaces: CLONE_NEWTIME and clone3()? Michael Kerrisk
2020-02-17 14:59     ` Christian Brauner
2020-02-17 21:47       ` Michael Kerrisk (man-pages)
2020-02-17 23:03         ` Christian Brauner
2020-02-17 23:29           ` Thomas Gleixner
2020-02-18  2:37             ` Eric W. Biederman
2020-02-18 17:11           ` Adrian Reber
2020-02-18 17:26             ` Christian Brauner
2019-11-12  1:26 ` [PATCHv8 04/34] time: Add timens_offsets to be used for tasks in timens Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 05/34] posix-clocks: Rename the clock_get() callback to clock_get_timespec() Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 06/34] posix-clocks: Rename .clock_get_timespec() callbacks accordingly Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 07/34] alarmtimer: Rename gettime() callback to get_ktime() Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 08/34] alarmtimer: Provide get_timespec() callback Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 09/34] posix-clocks: Introduce clock_get_ktime() callback Dmitry Safonov
2019-11-12  1:26 ` [PATCHv8 10/34] posix-timers: Use clock_get_ktime() in common_timer_get() Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 11/34] posix-clocks: Wire up clock_gettime() with timens offsets Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 12/34] kernel: Add do_timens_ktime_to_host() helper Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 13/34] timerfd: Make timerfd_settime() time namespace aware Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 14/34] posix-timers: Make timer_settime() " Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 15/34] alarmtimer: Make nanosleep " Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 16/34] hrtimers: Prepare hrtimer_nanosleep() for time namespaces Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 17/34] posix-timers: Make clock_nanosleep() time namespace aware Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 18/34] fs/proc: Respect boottime inside time namespace for /proc/uptime Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 19/34] x86/vdso: Restrict splitting VVAR VMA Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 20/34] lib/vdso: Prepare for time namespace support Dmitry Safonov
     [not found]   ` <20191112012724.250792-21-dima-nzgTgzXrdUbQT0dZR+AlfA@public.gmane.org>
2020-01-12 10:32     ` Thomas Gleixner
2019-11-12  1:27 ` [PATCHv8 21/34] x86/vdso: Provide vdso_data offset on vvar_page Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 22/34] x86/vdso: Add timens page Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 23/34] time: Allocate per-timens vvar page Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 24/34] x86/vdso: Handle faults on timens page Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 25/34] x86/vdso: On timens page fault prefault also VVAR page Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 26/34] x86/vdso: Zap vvar pages on switch a time namspace Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 27/34] fs/proc: Introduce /proc/pid/timens_offsets Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 28/34] selftests/timens: Add Time Namespace test for supported clocks Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 29/34] selftests/timens: Add a test for timerfd Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 30/34] selftests/timens: Add a test for clock_nanosleep() Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 31/34] selftests/timens: Add procfs selftest Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 32/34] selftests/timens: Add timer offsets test Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 33/34] selftests/timens: Add a simple perf test for clock_gettime() Dmitry Safonov
2019-11-12  1:27 ` [PATCHv8 34/34] selftests/timens: Check for right timens offsets after fork and exec Dmitry Safonov
2019-11-21 18:05 ` [PATCHv8 00/34] kernel: Introduce Time Namespace Andrei Vagin
2019-12-11 20:38   ` Dmitry Safonov [this message]
2020-01-09 21:09     ` Thomas Gleixner
2020-01-10  9:52       ` Vincenzo Frascino

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