linux-kernel - Re: Re: [PATCH] RTC: Add mmap method to rtc character driver

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Message-Id: <1154490859.17171.12.camel@cog.beaverton.ibm.com>
Date:	Tue, 01 Aug 2006 20:54:19 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	a.zummo@...ertech.it, jg@...edesktop.org
Subject: Re: Re: [PATCH] RTC: Add mmap method to rtc character driver

On Wed, 2006-07-26 at 06:04 +1000, Dave Airlie wrote:
> I'm wondering why x86 doesn't have gettimeofday vDSO (does x86 have
> proper vDSO support at all apart from sysenter?),

I know, I'm late to the party here. :)

Anyway, i386 doesn't have vDSO gettimeofday because its always been too
messy to do. Now that the clocksource bits are in, we can start to
really work on it.

I just uploaded my C4 release of the timekeeping code here:
http://sr71.net/~jstultz/tod/broken-out/

If you grab the following patches:
  linux-2.6.18-rc3_timeofday-vsyscall-support_C4.patch 
  linux-2.6.18-rc3_timeofday-i386-vsyscall_C4.patch

They should apply to the current -git tree and then you can use the
following test to see an LD_PRELOAD demo (as real support needs glibc
changes).

http://sr71.net/~jstultz/tod/vsyscall-gtod_test_C4.tar.bz2

Only lightly tested, so beware, and I've only added support so far for
the TSC (so don't be surprised if you don't see a performance
improvement if you using a different clocksource).

thanks
-john

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