[PATCH][2.4.20-pre5] non syscall gettimeofday

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The following patch implements a shared memory interface to allow
implementing gettimeofday (and other clock measurement) using the TSC
counter on i386. On a 1.6G Xeon this reduces gettimeofday from 1.2 us
per call to .17 us per call.

The interface is through a /proc/tscinfo that is mmap'd by the library.
If the kernel doesn't have working TSC and/or has NUMA TSC problems then
the /proc file will not exist and the library should fall back to a
syscall.

Attachments:
        patch for 2.4.20-pre5
        sample library routine

• text/x-patch attachment: ugettimeofday-2.4.20-pre5.patch__charset_ISO-8859-1

• text/x-csrc attachment: ugettimeofday.c__charset_ISO-8859-1

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