From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Airlie <airlied@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>,
Segher Boessenkool <segher@kernel.crashing.org>,
linux-kernel@vger.kernel.org, a.zummo@towertech.it,
jg@freedesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver
Date: Tue, 25 Jul 2006 13:24:58 -0700 [thread overview]
Message-ID: <44C67E1A.7050105@zytor.com> (raw)
In-Reply-To: <21d7e9970607251304n5681bf44gc751c21fd79be99d@mail.gmail.com>
Dave Airlie wrote:
>
> So far the requirements are pretty much not high resolution but is
> accurate and increasing. so like 10ms is fine, the current X timer is
> in the 20ms range.
>
> I think an mmap'ed page with whatever cgt(CLOCK_MONOTONIC) returns
> would be very good, but it might be nice to implement some sort of new
> generic /dev that X can mmap and each arch can do what they want in
> it,
>
> I'm wondering why x86 doesn't have gettimeofday vDSO (does x86 have
> proper vDSO support at all apart from sysenter?),
>
The i386 vdso right now has only two entry points, as far as I can tell:
system call and signal return.
There is no reason it couldn't have more than that. A low-resolution
and a high-resolution gettimeofday might be a good idea.
-hpa
next prev parent reply other threads:[~2006-07-25 20:26 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-25 17:41 [PATCH] RTC: Add mmap method to rtc character driver Neil Horman
2006-07-25 17:55 ` Arjan van de Ven
2006-07-25 18:01 ` Jim Gettys
2006-07-25 18:22 ` Neil Horman
2006-07-25 18:32 ` Arjan van de Ven
2006-07-25 18:43 ` Neil Horman
2006-07-25 18:53 ` Arjan van de Ven
2006-07-25 19:03 ` Neil Horman
2006-07-25 19:06 ` Arjan van de Ven
2006-07-25 19:07 ` John W. Linville
2006-07-25 19:16 ` Arjan van de Ven
2006-07-25 19:08 ` H. Peter Anvin
2006-07-25 17:57 ` Segher Boessenkool
2006-07-25 18:28 ` Neil Horman
2006-07-25 18:56 ` Segher Boessenkool
2006-07-25 19:07 ` Neil Horman
2006-07-25 19:10 ` H. Peter Anvin
2006-07-25 19:21 ` Neil Horman
2006-07-25 19:31 ` Segher Boessenkool
2006-07-25 19:47 ` Neil Horman
2006-07-25 20:04 ` Dave Airlie
2006-07-25 20:24 ` H. Peter Anvin [this message]
2006-07-25 20:47 ` Neil Horman
2006-07-25 20:50 ` H. Peter Anvin
2006-07-25 22:25 ` Neil Horman
2006-07-25 22:33 ` H. Peter Anvin
2006-07-25 23:10 ` Neil Horman
2006-07-25 23:22 ` H. Peter Anvin
2006-07-26 0:03 ` Neil Horman
2006-07-25 23:29 ` David Lang
2006-07-26 0:18 ` Neil Horman
2006-07-25 23:29 ` Segher Boessenkool
2006-07-25 23:56 ` Neil Horman
2006-07-26 0:02 ` H. Peter Anvin
2006-07-26 0:20 ` Neil Horman
2006-07-26 0:36 ` H. Peter Anvin
2006-07-26 14:45 ` A better interface, perhaps: a timed signal flag Theodore Tso
2006-07-28 13:33 ` Steven Rostedt
2006-07-28 14:52 ` Theodore Tso
2006-07-28 15:05 ` Steven Rostedt
2006-07-28 16:41 ` Alan Cox
2006-07-28 16:44 ` Steven Rostedt
2006-07-28 20:01 ` Alan Cox
2006-07-28 20:12 ` Steven Rostedt
2006-07-28 20:36 ` Alan Cox
2006-07-28 20:31 ` Steven Rostedt
2006-07-28 17:11 ` H. Peter Anvin
2006-07-25 20:58 ` [PATCH] RTC: Add mmap method to rtc character driver Jim Gettys
2006-07-25 21:04 ` H. Peter Anvin
2006-07-25 21:14 ` Jim Gettys
2006-07-25 21:18 ` H. Peter Anvin
2006-07-25 21:39 ` Jim Gettys
2006-07-29 4:28 ` Bill Huey
2006-07-29 12:54 ` Neil Horman
2006-07-29 20:41 ` Bill Huey
2006-07-29 21:43 ` Neil Horman
2006-07-29 22:45 ` Keith Packard
2006-07-29 23:18 ` Edgar Toernig
2006-07-29 21:49 ` Edgar Toernig
2006-07-29 22:51 ` itimer again (Re: [PATCH] RTC: Add mmap method to rtc character driver) Bill Huey
2006-07-29 23:35 ` Nicholas Miell
2006-07-30 1:00 ` Bill Huey
2006-07-30 1:22 ` Nicholas Miell
2006-07-30 1:39 ` Bill Huey
2006-07-30 2:02 ` Nicholas Miell
2006-07-30 14:33 ` Theodore Tso
2006-07-30 22:20 ` Bill Huey
2006-07-31 15:40 ` Theodore Tso
2006-07-30 0:16 ` Edgar Toernig
2006-07-30 0:24 ` Bill Huey
2006-07-29 14:02 ` [PATCH] RTC: Add mmap method to rtc character driver Thomas Gleixner
2006-07-26 13:17 ` Martin J. Bligh
2006-08-02 3:54 ` john stultz
2006-08-02 4:26 ` H. Peter Anvin
2006-08-02 4:34 ` john stultz
2006-07-25 23:26 ` Segher Boessenkool
2006-07-26 0:10 ` Neil Horman
2006-07-25 20:03 ` Paul Mackerras
2006-07-25 23:27 ` Segher Boessenkool
2006-07-26 0:06 ` Neil Horman
2006-07-25 18:00 ` Jim Gettys
2006-07-25 18:17 ` Neil Horman
2006-07-26 15:16 ` Andi Kleen
2006-07-26 17:25 ` Jim Gettys
2006-07-27 23:53 ` Paul Mackerras
2006-07-28 3:29 ` Jim Gettys
2006-07-28 11:59 ` Neil Horman
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