From: Thomas Gleixner <tglx@linutronix.de>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: Christoph Hellwig <hch@infradead.org>,
lkml <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Ulrich Drepper <drepper@redhat.com>,
Andrew Morton <akpm@osdl.org>, netdev <netdev@vger.kernel.org>,
Zach Brown <zach.brown@oracle.com>
Subject: Re: [take12 3/3] kevent: Timer notifications.
Date: Mon, 21 Aug 2006 16:25:49 +0200 [thread overview]
Message-ID: <1156170349.4725.29.camel@localhost.localdomain> (raw)
In-Reply-To: <20060821111848.GB8608@2ka.mipt.ru>
On Mon, 2006-08-21 at 15:18 +0400, Evgeniy Polyakov wrote:
> On Mon, Aug 21, 2006 at 12:12:39PM +0100, Christoph Hellwig (hch@infradead.org) wrote:
> > On Mon, Aug 21, 2006 at 02:19:49PM +0400, Evgeniy Polyakov wrote:
> > >
> > >
> > > Timer notifications.
> > >
> > > Timer notifications can be used for fine grained per-process time
> > > management, since interval timers are very inconvenient to use,
> > > and they are limited.
>
> > Shouldn't this at leat use a hrtimer?
>
> Not everymachine has them
Every machine has hrtimers - not necessarily with high resolution timer
support, but the core code is there in any case and it is designed to
provide fine grained timers.
In case of high resolution time support one would expect that the "fine
grained" timer event is actually fine grained.
> and getting into account possibility that
> userspace can be scheduled away, it will be overkill.
If you think out your argument then everything which is fine grained or
high responsive should be removed from userspace access for the very
same reason. Please look at the existing users of the hrtimer subsystem
- all of them are exposed to userspace.
tglx
next prev parent reply other threads:[~2006-08-22 17:02 UTC|newest]
Thread overview: 143+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <12345678912345.GA1898@2ka.mipt.ru>
2006-08-17 7:43 ` [take11 0/3] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-17 7:43 ` [take11 1/3] kevent: Core files Evgeniy Polyakov
2006-08-17 7:43 ` [take11 2/3] kevent: poll/select() notifications Evgeniy Polyakov
2006-08-17 7:43 ` [take11 3/3] kevent: Timer notifications Evgeniy Polyakov
2006-08-21 10:19 ` [take12 0/3] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-21 10:19 ` [take12 1/3] kevent: Core files Evgeniy Polyakov
2006-08-21 10:19 ` [take12 2/3] kevent: poll/select() notifications Evgeniy Polyakov
2006-08-21 10:19 ` [take12 3/3] kevent: Timer notifications Evgeniy Polyakov
2006-08-21 11:12 ` Christoph Hellwig
2006-08-21 11:18 ` Evgeniy Polyakov
2006-08-21 11:27 ` Arjan van de Ven
2006-08-21 11:59 ` Evgeniy Polyakov
2006-08-21 12:13 ` Arjan van de Ven
2006-08-21 12:25 ` Evgeniy Polyakov
2006-08-21 14:25 ` Thomas Gleixner [this message]
2006-08-22 18:25 ` Evgeniy Polyakov
2006-08-21 12:09 ` Evgeniy Polyakov
2006-08-22 4:36 ` Andrew Morton
2006-08-22 5:48 ` Evgeniy Polyakov
2006-08-21 12:37 ` [take12 4/3] kevent: Comment cleanup Evgeniy Polyakov
2006-08-23 8:51 ` [take12 1/3] kevent: Core files Eric Dumazet
2006-08-23 9:18 ` Evgeniy Polyakov
2006-08-23 9:23 ` Eric Dumazet
2006-08-23 9:29 ` Evgeniy Polyakov
2006-08-22 7:00 ` [take12 0/3] kevent: Generic event handling mechanism Nicholas Miell
2006-08-22 7:24 ` Evgeniy Polyakov
2006-08-22 8:17 ` Nicholas Miell
2006-08-22 8:23 ` David Miller
2006-08-22 8:59 ` Nicholas Miell
2006-08-22 14:59 ` James Morris
2006-08-22 20:00 ` Nicholas Miell
2006-08-22 20:36 ` David Miller
2006-08-22 21:13 ` Nicholas Miell
2006-08-22 21:25 ` David Miller
2006-08-22 22:58 ` Nicholas Miell
2006-08-22 23:46 ` Ulrich Drepper
2006-08-23 1:51 ` Nicholas Miell
2006-08-23 6:54 ` Evgeniy Polyakov
2006-08-22 8:37 ` Evgeniy Polyakov
2006-08-22 9:29 ` Nicholas Miell
2006-08-22 10:03 ` Evgeniy Polyakov
2006-08-22 19:57 ` Nicholas Miell
2006-08-22 20:16 ` Evgeniy Polyakov
2006-08-22 21:13 ` Nicholas Miell
2006-08-22 21:37 ` Randy.Dunlap
2006-08-22 22:01 ` Andrew Morton
2006-08-22 22:17 ` David Miller
2006-08-22 23:35 ` Andrew Morton
2006-08-22 22:58 ` Nicholas Miell
2006-08-22 23:06 ` David Miller
2006-08-23 1:36 ` The Proposed Linux kevent API (was: Re: [take12 0/3] kevent: Generic event handling mechanism.) Nicholas Miell
2006-08-23 2:01 ` The Proposed Linux kevent API Howard Chu
2006-08-23 3:31 ` David Miller
2006-08-23 3:47 ` Nicholas Miell
2006-08-23 4:23 ` Nicholas Miell
2006-08-23 6:22 ` The Proposed Linux kevent API (was: Re: [take12 0/3] kevent: Generic event handling mechanism.) Evgeniy Polyakov
2006-08-23 8:01 ` Nicholas Miell
2006-08-23 18:24 ` The Proposed Linux kevent API Stephen Hemminger
2006-08-22 23:22 ` [take12 0/3] kevent: Generic event handling mechanism Randy.Dunlap
[not found] ` <b3f268590608220957g43a16d6bmde8a542f8ad8710b@mail.gmail.com>
2006-08-22 17:09 ` Jari Sundell
2006-08-22 18:01 ` Evgeniy Polyakov
2006-08-22 19:14 ` Jari Sundell
2006-08-22 19:47 ` Evgeniy Polyakov
2006-08-22 22:51 ` Jari Sundell
2006-08-22 23:11 ` Alexey Kuznetsov
2006-08-23 0:28 ` Jari Sundell
2006-08-23 0:32 ` David Miller
2006-08-23 0:43 ` Jari Sundell
2006-08-23 6:56 ` Evgeniy Polyakov
2006-08-23 7:07 ` Andrew Morton
2006-08-23 7:10 ` Evgeniy Polyakov
2006-08-23 9:58 ` Andi Kleen
2006-08-23 10:03 ` Evgeniy Polyakov
2006-08-23 7:35 ` David Miller
2006-08-23 8:18 ` Nicholas Miell
2006-08-23 7:43 ` Ian McDonald
2006-08-23 7:50 ` Evgeniy Polyakov
2006-08-23 16:09 ` Andrew Morton
2006-08-23 16:22 ` Evgeniy Polyakov
2006-08-23 8:22 ` Jari Sundell
2006-08-23 8:39 ` Evgeniy Polyakov
2006-08-23 9:49 ` Jari Sundell
2006-08-23 10:20 ` Evgeniy Polyakov
2006-08-23 10:34 ` Jari Sundell
2006-08-23 10:51 ` Evgeniy Polyakov
2006-08-23 12:55 ` Jari Sundell
2006-08-23 13:11 ` Evgeniy Polyakov
2006-08-22 11:54 ` [PATCH] kevent_user: remove non-chardev interface Christoph Hellwig
2006-08-22 12:17 ` Evgeniy Polyakov
2006-08-22 12:27 ` Christoph Hellwig
2006-08-22 12:39 ` Evgeniy Polyakov
2006-08-22 11:55 ` [PATCH] kevent_user: use struct kevent_mring for the page ring Christoph Hellwig
2006-08-22 12:20 ` Evgeniy Polyakov
2006-08-23 11:24 ` [take13 0/3] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-23 11:24 ` [take13 1/3] kevent: Core files Evgeniy Polyakov
2006-08-23 11:24 ` [take13 2/3] kevent: poll/select() notifications Evgeniy Polyakov
2006-08-23 11:24 ` [take13 3/3] kevent: Timer notifications Evgeniy Polyakov
2006-08-23 12:51 ` [take13 1/3] kevent: Core files Eric Dumazet
[not found] ` <20060823132753.GB29056@2ka.mipt.ru>
2006-08-23 13:44 ` Evgeniy Polyakov
2006-08-24 20:03 ` Christoph Hellwig
2006-08-25 5:48 ` Evgeniy Polyakov
2006-08-25 6:20 ` Andrew Morton
2006-08-25 6:32 ` Evgeniy Polyakov
2006-08-25 6:58 ` Andrew Morton
2006-08-25 7:20 ` Evgeniy Polyakov
2006-08-25 7:01 ` David Miller
2006-08-25 7:13 ` Andrew Morton
[not found] ` <Pine.LNX.4.63.0608231313370.8007@alpha.polcom.net>
[not found] ` <20060823122509.GA5744@2ka.mipt.ru>
[not found] ` <Pine.LNX.4.63.0608231437170.8007@alpha.polcom.net>
[not found] ` <20060823134227.GC29056@2ka.mipt.ru>
2006-08-23 18:56 ` [take13 0/3] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-23 19:42 ` Evgeniy Polyakov
2006-08-25 9:54 ` [take14 " Evgeniy Polyakov
2006-08-25 9:54 ` [take14 1/3] kevent: Core files Evgeniy Polyakov
2006-08-25 9:54 ` [take14 2/3] kevent: poll/select() notifications Evgeniy Polyakov
2006-08-25 9:54 ` [take14 3/3] kevent: Timer notifications Evgeniy Polyakov
2006-08-27 21:03 ` [take14 0/3] kevent: Generic event handling mechanism Ulrich Drepper
2006-08-28 1:57 ` David Miller
2006-08-28 2:11 ` Ulrich Drepper
2006-08-28 2:40 ` Nicholas Miell
2006-08-28 2:59 ` Nicholas Miell
2006-08-28 11:47 ` Jari Sundell
2006-08-31 7:58 ` Evgeniy Polyakov
2006-09-09 16:10 ` Ulrich Drepper
2006-09-11 5:42 ` Evgeniy Polyakov
2006-09-04 10:14 ` [take15 0/4] " Evgeniy Polyakov
2006-09-04 9:58 ` Evgeniy Polyakov
2006-09-04 10:14 ` [take15 1/4] kevent: Core files Evgeniy Polyakov
2006-09-04 10:14 ` [take15 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-09-04 10:14 ` [take15 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-09-04 10:14 ` [take15 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-09-05 13:39 ` Arnd Bergmann
2006-09-06 6:42 ` Evgeniy Polyakov
2006-09-05 13:28 ` [take15 1/4] kevent: Core files Arnd Bergmann
2006-09-06 6:51 ` Evgeniy Polyakov
2006-09-04 10:24 ` [take15 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-09-06 11:55 ` [take16 " Evgeniy Polyakov
2006-09-06 11:55 ` [take16 1/4] kevent: Core files Evgeniy Polyakov
2006-09-06 11:55 ` [take16 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-09-06 11:55 ` [take16 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-09-06 11:55 ` [take16 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-09-06 13:40 ` [take16 1/4] kevent: Core files Chase Venters
2006-09-06 13:54 ` Chase Venters
2006-09-06 14:03 ` Evgeniy Polyakov
2006-09-06 14:23 ` Chase Venters
2006-09-07 7:10 ` Evgeniy Polyakov
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