linux-kernel - Re: [patch, v2.6.22-rc6] sys

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Message-ID: <46805C4F.1050200@rtr.ca>
Date:	Mon, 25 Jun 2007 20:22:39 -0400
From:	Mark Lord <lkml@....ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch, v2.6.22-rc6] sys_time() speedup

Ingo Molnar wrote:
> Subject: [patch] sys_time() speedup
> From: Ingo Molnar <mingo@...e.hu>
> 
> improve performance of sys_time(). sys_time() returns time in seconds, 
> but it does so by calling do_gettimeofday() and then returning the 
> tv_sec portion of the GTOD time. But the data structure "xtime", which 
> is updated by every timer/scheduler tick, already offers HZ granularity 
> time.

How well synchronized is xtime with real-time ?

Programs invoking sys_time() do expect it to be as accurate
as gettimeofday(), even if only at 1-second boundaries.

Cheers
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