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From: Arnd Bergmann <arnd@arndb.de>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: "y2038 Mailman List" <y2038@lists.linaro.org>,
	"Richard Henderson" <rth@twiddle.net>,
	"Ivan Kokshaysky" <ink@jurassic.park.msu.ru>,
	"Matt Turner" <mattst88@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Deepa Dinamani" <deepa.kernel@gmail.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Will Deacon" <will@kernel.org>,
	"Michal Koutný" <mkoutny@suse.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Dave Hansen" <dave.hansen@linux.intel.com>,
	alpha <linux-alpha@vger.kernel.org>
Subject: Re: [PATCH 11/23] y2038: rusage: use __kernel_old_timeval
Date: Wed, 13 Nov 2019 11:02:12 +0100	[thread overview]
Message-ID: <CAK8P3a03FRfTsXADH+xfLsWxCu54JXvXbb-OdyGXXf88RNP34w@mail.gmail.com> (raw)
In-Reply-To: <20191112210915.GD5130@uranus>

On Tue, Nov 12, 2019 at 10:09 PM Cyrill Gorcunov <gorcunov@gmail.com> wrote:
>
> On Fri, Nov 08, 2019 at 10:12:10PM +0100, Arnd Bergmann wrote:

> > ---
> > Question: should we also rename 'struct rusage' into 'struct __kernel_rusage'
> > here, to make them completely unambiguous?
>
> The patch looks ok to me. I must confess I looked into rusage long ago
> so __kernel_timespec type used in uapi made me nervious at first,
> but then i found that we've this type defined in time_types.h uapi
> so userspace should be safe. I also like the idea of __kernel_rusage
> but definitely on top of the series.

There are clearly too many time types at the moment, but I'm in the
process of throwing out the ones we no longer need now.

I do have a number patches implementing other variants for the syscall,
and I suppose that if we end up adding __kernel_rusage, that would
have to go with a set of syscalls using 64-bit seconds/nanoseconds
rather than the old 32/64 microseconds. I don't know what other
changes remain that anyone would want from sys_waitid() now that
it does support pidfd.

If there is still a need for a new waitid() replacement, that should take
that new __kernel_rusage I think, but until then I hope we are fine
with today's getrusage+waitid based on the current struct rusage.

BSD has wait6() to return separate rusage structures for 'self' and
'children', but I could not find any application (using the freebsd
sources and debian code search) that actually uses that information,
so there might not be any demand for that.

> Reviewed-by: Cyrill Gorcunov <gorcunov@gmail.com>

Thanks,

      Arnd

  reply	other threads:[~2019-11-13 10:02 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 21:02 [PATCH 00/23] y2038 cleanups Arnd Bergmann
2019-11-08 21:07 ` [PATCH 01/23] y2038: remove CONFIG_64BIT_TIME Arnd Bergmann
2019-11-20 22:28   ` [Y2038] " Ben Hutchings
2019-11-20 22:58     ` Dmitry Safonov
2019-11-08 21:07 ` [PATCH 02/23] y2038: add __kernel_old_timespec and __kernel_old_time_t Arnd Bergmann
2019-11-09 19:02   ` Deepa Dinamani
2019-11-20 22:30   ` [Y2038] " Ben Hutchings
2019-11-21 14:17     ` Arnd Bergmann
2019-11-08 21:07 ` [PATCH 03/23] y2038: vdso: change timeval to __kernel_old_timeval Arnd Bergmann
2019-11-13 21:56   ` Thomas Gleixner
2019-11-08 21:07 ` [PATCH 04/23] y2038: vdso: change timespec to __kernel_old_timespec Arnd Bergmann
2019-11-08 21:07 ` [PATCH 05/23] y2038: vdso: change time_t to __kernel_old_time_t Arnd Bergmann
2019-11-13 21:57   ` Thomas Gleixner
2019-11-08 21:07 ` [PATCH 06/23] y2038: vdso: nds32: open-code timespec_add_ns() Arnd Bergmann
2019-11-08 21:07 ` [PATCH 07/23] y2038: vdso: powerpc: avoid timespec references Arnd Bergmann
2019-11-20 22:43   ` [Y2038] " Ben Hutchings
2019-11-21 14:23     ` Arnd Bergmann
2019-11-21 16:25       ` Christophe Leroy
2019-11-27 11:03         ` Arnd Bergmann
2019-12-02 12:55           ` Christophe Leroy
2019-12-02 14:03             ` Arnd Bergmann
2019-11-08 21:07 ` [PATCH 08/23] y2038: ipc: remove __kernel_time_t reference from headers Arnd Bergmann
2019-11-20 22:49   ` [Y2038] " Ben Hutchings
2019-11-21 14:28     ` Arnd Bergmann
2019-11-08 21:07 ` [PATCH 09/23] y2038: stat: avoid 'time_t' in 'struct stat' Arnd Bergmann
2019-11-08 21:12 ` [PATCH 10/23] y2038: uapi: change __kernel_time_t to __kernel_old_time_t Arnd Bergmann
2019-11-09 19:03   ` Deepa Dinamani
2019-11-11 12:38   ` Christian Brauner
2019-11-08 21:12 ` [PATCH 11/23] y2038: rusage: use __kernel_old_timeval Arnd Bergmann
2019-11-12 21:09   ` Cyrill Gorcunov
2019-11-13 10:02     ` Arnd Bergmann [this message]
2019-11-13 17:22       ` Cyrill Gorcunov
2019-11-14  0:38       ` Christian Brauner
2019-11-14 10:18         ` Arnd Bergmann
2019-11-14 10:23           ` Christian Brauner
2019-11-08 21:12 ` [PATCH 12/23] y2038: syscalls: change remaining timeval to __kernel_old_timeval Arnd Bergmann
2019-11-11 12:44   ` Christian Brauner
2019-11-13 22:39   ` Rafael J. Wysocki
2019-11-08 21:12 ` [PATCH 13/23] y2038: socket: remove timespec reference in timestamping Arnd Bergmann
2019-11-09 19:03   ` Deepa Dinamani
2019-11-11 20:24   ` Arnd Bergmann
2019-11-08 21:12 ` [PATCH 14/23] y2038: make ns_to_compat_timeval use __kernel_old_timeval Arnd Bergmann
2019-11-08 21:12 ` [PATCH 15/23] y2038: elfcore: Use __kernel_old_timeval for process times Arnd Bergmann
2019-11-08 21:12 ` [PATCH 16/23] y2038: timerfd: Use timespec64 internally Arnd Bergmann
2019-11-13 21:49   ` Thomas Gleixner
2019-11-08 21:12 ` [PATCH 17/23] y2038: time: avoid timespec usage in settimeofday() Arnd Bergmann
2019-11-13 21:53   ` Thomas Gleixner
2019-11-14 11:06     ` Arnd Bergmann
2019-11-14 14:04       ` Thomas Gleixner
2019-11-14 14:35         ` Arnd Bergmann
2019-11-14 23:01   ` Abel Vesa
2019-11-15  7:58     ` Arnd Bergmann
2019-11-15 10:27       ` Rasmus Villemoes
2019-11-15 13:50         ` Arnd Bergmann
2019-11-08 21:12 ` [PATCH 18/23] y2038: itimer: compat handling to itimer.c Arnd Bergmann
2019-11-13 21:54   ` Thomas Gleixner
2019-11-08 21:12 ` [PATCH 19/23] y2038: use compat_{get,set}_itimer on alpha Arnd Bergmann
2019-12-02 13:13   ` Guenter Roeck
2019-11-08 21:12 ` [PATCH 20/23] y2038: move itimer reset into itimer.c Arnd Bergmann
2019-11-09 13:43   ` Ondrej Mosnacek
2019-11-09 21:02     ` Arnd Bergmann
2019-11-09 23:07       ` Ondrej Mosnacek
2019-11-11 10:57         ` Arnd Bergmann
2019-11-14  8:51           ` Ondrej Mosnacek
2019-11-14 10:51             ` Thomas Gleixner
2019-11-13 22:03   ` Thomas Gleixner
2019-11-08 21:12 ` [PATCH 21/23] y2038: itimer: change implementation to timespec64 Arnd Bergmann
2019-11-13 22:28   ` Thomas Gleixner
2019-11-14  2:06     ` Steven Rostedt
2019-11-14 10:48       ` Thomas Gleixner
2019-11-14 10:52       ` Arnd Bergmann
2019-11-14 10:51     ` Arnd Bergmann
2019-11-14 10:57       ` Thomas Gleixner
2019-11-21 16:52   ` [Y2038] " Ben Hutchings
2019-11-25 20:26     ` Arnd Bergmann
2019-11-08 21:12 ` [PATCH 22/23] [RFC] y2038: itimer: use ktime_t internally Arnd Bergmann
2019-11-13 22:30   ` Thomas Gleixner
2019-11-08 21:12 ` [PATCH 23/23] y2038: allow disabling time32 system calls Arnd Bergmann
2019-11-11 12:31   ` Christian Brauner
2019-11-13 21:40 ` [PATCH 00/23] y2038 cleanups Arnd Bergmann

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