From: Alexander Shishkin <virtuoso@slind.org>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Ken MacLeod <ken@bitsko.slc.ut.us>,
Shaun Reich <predator106@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@suse.de>,
Feng Tang <feng.tang@intel.com>, Michael Tokarev <mjt@tls.msk.ru>,
Marcelo Tosatti <mtosatti@redhat.com>,
John Stultz <johnstul@us.ibm.com>,
Chris Friesen <chris.friesen@genband.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Artem Bityutskiy <dedekind1@gmail.com>,
Davide Libenzi <davidel@xmailserver.org>,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org,
Michael Kerrisk <mtk.manpages@gmail.com>,
Alexander Shishkin <virtuoso@slind.org>
Subject: Re: [RFCv4] timerfd: add TFD_NOTIFY_CLOCK_SET to watch for clock changes
Date: Thu, 10 Mar 2011 10:19:21 +0200 [thread overview]
Message-ID: <20110310081921.GC11410@shisha.kicks-ass.net> (raw)
In-Reply-To: <AANLkTinZioShsr3O0Z=xaEQ-S=JBCgs_SS_LdsBnNhZ2@mail.gmail.com>
On Thu, Mar 10, 2011 at 01:36:18AM +0100, Kay Sievers wrote:
> On Thu, Mar 10, 2011 at 01:25, Andrew Morton <akpm@linux-foundation.org> wrote:
> > On Wed, 9 Mar 2011 16:36:51 +0200
> > Alexander Shishkin <virtuoso@slind.org> wrote:
> >
> >> Changes since v3:
> >> - changed timerfd_settime() semantics (see below)
> >> Changes since v2:
> >> - replaced sysfs interface with a syscall
> >> - added sysctl/procfs handle to set a limit to the number of users
> >> - fixed issues pointed out by Greg.
> >> Changes since v1:
> >> - updated against 2.6.36-rc1,
> >> - added notification/filtering options,
> >> - added Documentation/ABI/sysfs-kernel-time-notify interface description.
>
> > It would be helpful to know if the identified users of this feature
> > actually find it useful and adequate. I guess the most common
> > application is the 1,001 desktop clock widgets. Do you have any
> > feedback from any of the owners of those?
>
> We want it for systemd, to provide cron-like functionality but without
> the need to stupidly wake up every minute and check the system time
> for possible jumps.
>
> It also sounds useful for a generic resume (after system suspend)
> notification for applications, which isn't really possible today.
Yes, but with John's CLOCK_BOOTTIME patches (which are in the tip tree
currently) it will be.
Regards,
--
Alex
WARNING: multiple messages have this Message-ID (diff)
From: Alexander Shishkin <virtuoso@slind.org>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Ken MacLeod <ken@bitsko.slc.ut.us>,
Shaun Reich <predator106@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@suse.de>,
Feng Tang <feng.tang@intel.com>, Michael Tokarev <mjt@tls.msk.ru>,
Marcelo Tosatti <mtosatti@redhat.com>,
John Stultz <johnstul@us.ibm.com>,
Chris Friesen <chris.friesen@genband.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Artem Bityutskiy <dedekind1@gmail.com>,
Davide Libenzi <davidel@xmailserver.org>,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org,
Michael Kerrisk <mtk.manpages@gmail.com>,
Alexander Shishkin <virtuoso@slind.org>
Subject: Re: [RFCv4] timerfd: add TFD_NOTIFY_CLOCK_SET to watch for clock changes
Date: Thu, 10 Mar 2011 10:19:21 +0200 [thread overview]
Message-ID: <20110310081921.GC11410@shisha.kicks-ass.net> (raw)
In-Reply-To: <AANLkTinZioShsr3O0Z=xaEQ-S=JBCgs_SS_LdsBnNhZ2@mail.gmail.com>
On Thu, Mar 10, 2011 at 01:36:18AM +0100, Kay Sievers wrote:
> On Thu, Mar 10, 2011 at 01:25, Andrew Morton <akpm@linux-foundation.org> wrote:
> > On Wed, 9 Mar 2011 16:36:51 +0200
> > Alexander Shishkin <virtuoso@slind.org> wrote:
> >
> >> Changes since v3:
> >> - changed timerfd_settime() semantics (see below)
> >> Changes since v2:
> >> - replaced sysfs interface with a syscall
> >> - added sysctl/procfs handle to set a limit to the number of users
> >> - fixed issues pointed out by Greg.
> >> Changes since v1:
> >> - updated against 2.6.36-rc1,
> >> - added notification/filtering options,
> >> - added Documentation/ABI/sysfs-kernel-time-notify interface description.
>
> > It would be helpful to know if the identified users of this feature
> > actually find it useful and adequate. I guess the most common
> > application is the 1,001 desktop clock widgets. Do you have any
> > feedback from any of the owners of those?
>
> We want it for systemd, to provide cron-like functionality but without
> the need to stupidly wake up every minute and check the system time
> for possible jumps.
>
> It also sounds useful for a generic resume (after system suspend)
> notification for applications, which isn't really possible today.
Yes, but with John's CLOCK_BOOTTIME patches (which are in the tip tree
currently) it will be.
Regards,
--
Alex
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next prev parent reply other threads:[~2011-03-10 8:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 14:36 [RFCv4] timerfd: add TFD_NOTIFY_CLOCK_SET to watch for clock changes Alexander Shishkin
2011-03-10 0:25 ` Andrew Morton
2011-03-10 0:25 ` Andrew Morton
2011-03-10 0:36 ` Kay Sievers
2011-03-10 0:36 ` Kay Sievers
2011-03-10 8:19 ` Alexander Shishkin [this message]
2011-03-10 8:19 ` Alexander Shishkin
2011-03-10 9:08 ` Thomas Gleixner
2011-03-10 11:16 ` Jamie Lokier
2011-03-10 11:16 ` Jamie Lokier
2011-03-10 11:41 ` Thomas Gleixner
2011-03-10 11:41 ` Thomas Gleixner
2011-03-10 2:01 ` Scott James Remnant
2011-03-10 2:01 ` Scott James Remnant
2011-03-10 8:25 ` Andrew Morton
2011-03-10 8:25 ` Andrew Morton
2011-03-11 19:51 ` Scott James Remnant
2011-03-11 19:51 ` Scott James Remnant
2011-03-11 19:56 ` Thomas Gleixner
2011-03-11 19:56 ` Thomas Gleixner
2011-03-15 1:53 ` Scott James Remnant
2011-03-15 1:53 ` Scott James Remnant
2011-03-10 8:10 ` Alexander Shishkin
2011-03-10 8:02 ` Kirill A. Shutemov
2011-03-10 8:15 ` Alexander Shishkin
2011-03-10 8:48 ` Arnd Bergmann
2011-03-10 14:19 ` Alexander Shishkin
2011-03-10 9:52 ` Thomas Gleixner
2011-03-10 14:12 ` Alexander Shishkin
2011-03-10 14:55 ` Thomas Gleixner
2011-03-10 15:43 ` Alexander Shishkin
2011-03-10 16:40 ` Thomas Gleixner
2011-03-10 21:57 ` Thomas Gleixner
2011-04-27 10:43 ` [RFC][PATCH 1/4] clock_rtoffset: new syscall Alexander Shishkin
2011-04-27 10:43 ` [RFC][PATCH 2/4] hrtimer: add cancellation when clock is set Alexander Shishkin
2011-04-27 10:43 ` [RFC][PATCH 3/4] hrtimer: add nanosleep cancellation Alexander Shishkin
2011-04-27 10:43 ` [RFC][PATCH 4/4] timerfd: add cancellation Alexander Shishkin
2011-04-27 14:02 ` [RFC][PATCH 1/4] clock_rtoffset: new syscall Thomas Gleixner
2011-04-27 19:11 ` john stultz
2011-04-27 22:19 ` Thomas Gleixner
2011-04-27 20:55 ` Kay Sievers
2011-04-29 17:32 ` Thomas Gleixner
2011-05-02 8:10 ` Alexander Shishkin
2011-04-28 7:15 ` Alexander Shishkin
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