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Message-Id: <200807251255.35675.david-b@pacbell.net> Date: Fri, 25 Jul 2008 12:55:35 -0700 From: David Brownell <david-b@...bell.net> To: Clemens Ladisch <clemens@...isch.de> 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 On Thursday 24 July 2008, Clemens Ladisch wrote: > David Brownell wrote: > > > 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.) On x86_64 the vsyscall stuff should kick in for gettimeofday() when HPET is in use, eliminating the need for /dev/hpet mmapping. I don't really know vsyscalls ... but if that could be done on i386 systems, the last argument for /dev/hpet would seem gone... -- 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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