From: Kay Sievers <kay.sievers@vrfy.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: Alexander Shishkin <virtuoso@slind.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> Subject: Re: [RFCv4] timerfd: add TFD_NOTIFY_CLOCK_SET to watch for clock changes Date: Thu, 10 Mar 2011 01:36:18 +0100 [thread overview] Message-ID: <AANLkTinZioShsr3O0Z=xaEQ-S=JBCgs_SS_LdsBnNhZ2@mail.gmail.com> (raw) In-Reply-To: <20110309162513.5058c824.akpm@linux-foundation.org> 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. Kay
WARNING: multiple messages have this Message-ID (diff)
From: Kay Sievers <kay.sievers-tD+1rO4QERM@public.gmane.org> To: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> Cc: Alexander Shishkin <virtuoso-0lOfPCoBze7YtjvyW6yDsg@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ken MacLeod <ken-VbOJbV3qneKf+c8Povm/Gg@public.gmane.org>, Shaun Reich <predator106-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, Alexander Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>, Greg Kroah-Hartman <gregkh-l3A5Bk7waGM@public.gmane.org>, Feng Tang <feng.tang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Michael Tokarev <mjt-XAri/EZa3C4vJsYlp49lxw@public.gmane.org>, Marcelo Tosatti <mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, John Stultz <johnstul-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>, Chris Friesen <chris.friesen-b7o/lNNmKxtBDgjK7y7TUQ@public.gmane.org>, "Kirill A. Shutemov" <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>, Artem Bityutskiy <dedekind1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Davide Libenzi <davidel-AhlLAIvw+VEjIGhXcJzhZg@public.gmane.org>, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Subject: Re: [RFCv4] timerfd: add TFD_NOTIFY_CLOCK_SET to watch for clock changes Date: Thu, 10 Mar 2011 01:36:18 +0100 [thread overview] Message-ID: <AANLkTinZioShsr3O0Z=xaEQ-S=JBCgs_SS_LdsBnNhZ2@mail.gmail.com> (raw) In-Reply-To: <20110309162513.5058c824.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> On Thu, Mar 10, 2011 at 01:25, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> wrote: > On Wed, 9 Mar 2011 16:36:51 +0200 > Alexander Shishkin <virtuoso-0lOfPCoBze7YtjvyW6yDsg@public.gmane.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. Kay
next prev parent reply other threads:[~2011-03-10 0:36 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 [this message] 2011-03-10 0:36 ` Kay Sievers 2011-03-10 8:19 ` Alexander Shishkin 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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