Date: Wed, 5 Nov 1997 13:45:57 -0700 (MST) From: Charles Mott <cmott@srv.net> To: hackers@hub.freebsd.org Subject: Re: gettimeofday() overhead Message-ID: <Pine.BSF.3.96.971105134512.15755A-100000@darkstar.home>
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On Wed, 5 Nov 1997, Tony Overfield wrote: > >On Tue, 4 Nov 1997, Mike Smith wrote: > > > >Unfortunately, this requires access to /dev/kmem, and thus your process > >must be running as root. IMHO this isn't really an acceptable tradeoff > >unless the application already requires it. > > What about a /dev/timeofday device that allowed you to read-only map > only the appropriate clock bits (or equiv.)? > This sounds like a good idea. Quite a few programs need event-based timestamps, and if gettimeofday() in the standard library could access /dev/timeofday without a user-kernel context switch, this would seem to be a performance enhancement to the system. Charles Mott
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