Date: Tue, 4 Nov 1997 23:42:43 -0700 (MST) From: Charles Mott <cmott@srv.net> To: Alex <garbanzo@hooked.net> Cc: Mike Smith <mike@smith.net.au>, hackers@hub.freebsd.org Subject: Re: gettimeofday() overhead Message-ID: <Pine.BSF.3.96.971104233602.942A-100000@darkstar.home> In-Reply-To: <Pine.BSF.3.96.971104174022.3158D-100000@zippy.dyn.ml.org>
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On Tue, 4 Nov 1997, Alex 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. > > Naw, just setgid kmem. > > > OTOH, if +/- 1 second is good enough, a once-a-second timer and a local > > call to gettimeofday() would be a simple and straightforward technique, > > as was also suggested. > > Probably right, but more accuracy within reason can't hurt. > At this point, accessing the kernel time variable from user space is mainly a point of interest (this is the hackers group, right?). I can read up on how to access /dev/kmem, but how is the kernel symbol table accessed? -- Charles Mott
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