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Message-ID: <4888691D.5090307@ladisch.de> Date: Thu, 24 Jul 2008 13:35:57 +0200 From: Clemens Ladisch <clemens@...isch.de> To: David Brownell <david-b@...bell.net> CC: lkml <linux-kernel@...r.kernel.org>, bob.picco@...com, venkatesh.pallipadi@...el.com, Vojtech Pavlik <vojtech@...e.cz>, the arch/x86 maintainers <x86@...nel.org> Subject: Re: [patch 2.6.26] /dev/hpet - fixes and cleanup David Brownell wrote: > I didn't find any software using /dev/hpet, except for > the example in Documentation/hpet.txt ... presumably I > was looking in the wrong place. I'd surely have retched > at anything mmapping hardware registers though. ;) http://subversion.jackaudio.org/jack/trunk/jack/config/os/gnu-linux/time.c > > This seems to be the only part of the userspace interface that is > > used in practice. Because of the availability of POSIX timers, it might > > make sense to deprecate the HPET ioctl interface. > > I'll leave that part up to someone else. If POSIX timers > are a sufficient userspace interface, great ... then that > mmap son't really be needed either! The idea is to be able to get a high-precision timer value without doing a syscall. (Whether the syscall overhead actually matters in a specific application is another question.) Regards, Clemens -- 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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