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Date: Wed, 11 Jun 2008 13:55:32 -0700 From: Arjan van de Ven <arjan@...radead.org> To: markh@...pro.net Cc: "linux-os (Dick Johnson)" <linux-os@...logic.com>, Jan Engelhardt <jengelh@...ozas.de>, "Kok, Auke" <auke-jan.h.kok@...el.com>, solsTiCe d'Hiver <solstice.dhiver@...il.com>, linux-kernel@...r.kernel.org Subject: Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6 On Wed, 11 Jun 2008 16:37:38 -0400 > > Mark > > > > Ok, what would one use besides the tsc to take a fast high-res time > stamp in a kernel module that could also be used in user land (same > time source) to for instance calculate the the time between an event > in the kernel to an event in user land? > > do_gettimeofday / gettimeofday are not really acceptable. why not? both of these (they're teh same) are the best the kernel can do. If there was a better way to do it, gettimeofday() would use it. It's not even a system call if we can get away with it (although system calls are pretty cheap) really, think about it. if there was a better way, gettimeofday() would use it. -- If you want to reach me at my work email, use arjan@...ux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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