From: Dmitry Safonov <0x7f454c46@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>, Dmitry Safonov <dima@arista.com>
Cc: linux-kernel@vger.kernel.org, Andrei Vagin <avagin@gmail.com>,
Adrian Reber <adrian@lisas.de>, Andrei Vagin <avagin@openvz.org>,
Andy Lutomirski <luto@kernel.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>, Ingo Molnar <mingo@redhat.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>,
containers@lists.linux-foundation.org, criu@openvz.org,
linux-api@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCHv4 03/28] posix-clocks: add another call back to return clock time in ktime_t
Date: Fri, 14 Jun 2019 15:39:13 +0100 [thread overview]
Message-ID: <af700944-694c-822b-4633-7de945f9d228@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1906141511440.1722@nanos.tec.linutronix.de>
Hi Thomas,
Thanks much for the review,
On 6/14/19 2:32 PM, Thomas Gleixner wrote:
> Dmitry,
>
> On Wed, 12 Jun 2019, Dmitry Safonov wrote:
>
>> From: Andrei Vagin <avagin@gmail.com>
>>
>> The callsite in common_timer_get() has already a comment:
>> /*
>> * The timespec64 based conversion is suboptimal, but it's not
>> * worth to implement yet another callback.
>> */
>> kc->clock_get(timr->it_clock, &ts64);
>> now = timespec64_to_ktime(ts64);
>>
>> Now we are going to add time namespaces and we need to be able to get:
>
> Please avoid 'we' and try to describe the changes in a neutral technical
> form, e.g.:
>
> The upcoming support for time namespaces requires to have access to:
>
>> * clock value in a task time namespace to return it from the clock_gettime
>> syscall.
>
> - The time in a tasks time namespace for sys_clock_gettime()
>
>> * clock valuse in the root time namespace to use it in
>> common_timer_get().
>
> - The time in the root name space for common_timer_get()
>
>> It looks like another reason why we need a separate callback to return
>> clock value in ktime_t.
>
> That adds a valid reason to finally implement a separate callback which
> returns the time in ktime_t format.
>
> Hmm?
Agree, the patch has become bigger than wanted and the message could
have been better in technical sense. Will split, add kernel doc and fix
the commit message(s).
[..]
> TBH, this patch is way to big. It changes too many things at once. Can you
> please structure it this way:
>
> 1) Rename k_clock::clock_get to k_clock::clock_get_timespec and fix up all
> struct initializers
>
> 2) Rename the clock_get_timespec functions per instance
>
> 3) Add the new callback
>
> 4) Add the new functions per instance and add them to the corresponding
> struct initializers
>
> 5) Use the new callback
>
Thanks,
Dima
next prev parent reply other threads:[~2019-06-14 14:39 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 19:25 [PATCHv4 00/28] kernel: Introduce Time Namespace Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 01/28] ns: " Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 02/28] timens: Add timens_offsets Dmitry Safonov
2019-06-14 13:11 ` Thomas Gleixner
2019-06-14 14:32 ` Dmitry Safonov
2019-07-29 22:26 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 03/28] posix-clocks: add another call back to return clock time in ktime_t Dmitry Safonov
2019-06-14 13:32 ` Thomas Gleixner
2019-06-14 14:39 ` Dmitry Safonov [this message]
2019-06-12 19:26 ` [PATCHv4 04/28] timens: Introduce CLOCK_MONOTONIC offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 05/28] timens: Introduce CLOCK_BOOTTIME offset Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 06/28] timerfd/timens: Take into account ns clock offsets Dmitry Safonov
2019-06-14 13:37 ` Thomas Gleixner
2019-06-16 17:43 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 07/28] posix-timers/timens: Take into account " Dmitry Safonov
2019-06-14 13:42 ` Thomas Gleixner
2019-06-16 17:45 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 08/28] timens/kernel: Take into account timens clock offsets in clock_nanosleep Dmitry Safonov
2019-06-14 13:49 ` Thomas Gleixner
2019-06-12 19:26 ` [PATCHv4 09/28] timens: Shift /proc/uptime Dmitry Safonov
2019-06-14 13:50 ` Thomas Gleixner
2019-06-16 17:48 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 10/28] x86/vdso2c: Correct err messages on file opening Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 11/28] x86/vdso2c: Convert iterator to unsigned Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 12/28] x86/vdso/Makefile: Add vobjs32 Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 13/28] x86/vdso: Restrict splitting VVAR VMA Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 14/28] x86/vdso: Rename vdso_image {.data=>.text} Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 15/28] x86/vdso: Add offsets page in vvar Dmitry Safonov
2019-06-14 13:58 ` Thomas Gleixner
2019-06-16 17:49 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 16/28] x86/vdso: Allocate timens vdso Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 17/28] x86/vdso: Switch image on setns()/unshare()/clone() Dmitry Safonov
2019-06-14 14:05 ` Thomas Gleixner
2019-06-16 17:51 ` Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 18/28] vdso: introduce timens_static_branch Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 19/28] timens: Add align for timens_offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 20/28] timens/fs/proc: Introduce /proc/pid/timens_offsets Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 21/28] selftest/timens: Add Time Namespace test for supported clocks Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 22/28] selftest/timens: Add a test for timerfd Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 23/28] selftest/timens: Add a test for clock_nanosleep() Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 24/28] selftest/timens: Add procfs selftest Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 25/28] selftest/timens: Add timer offsets test Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 26/28] x86/vdso: Align VDSO functions by CPU L1 cache line Dmitry Safonov
2019-06-14 14:13 ` Thomas Gleixner
2019-06-23 5:26 ` Andrei Vagin
2019-06-12 19:26 ` [PATCHv4 27/28] selftests: Add a simple perf test for clock_gettime() Dmitry Safonov
2019-06-12 19:26 ` [PATCHv4 28/28] selftest/timens: Check that a right vdso is mapped after fork and exec Dmitry Safonov
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