Plan 9 from Bell Labs’s /n/sources/patch/applied/venti2/readme

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
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Be less aggressive about maintaining timing information.
In particular, don't time code paths that would not otherwise
perform any system calls.

This cuts the system calls under load from about 70k/second to 3k/second.

Also a few fixes to fixarenas.c.


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