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add note at top of readme

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1 parent 16ece30 commit 7b07334296db5cfdcd8f052db067cd9e08a23f3d @bblum committed Dec 10, 2011
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==== Ben Blum - 15-799A - Fall 2011 ====
+Before you get started on reading this, please make a note of the time. Section
+5.2 will ask you for how long it took you to get up to speed on using the tool,
+most of which should be reading this document.
==== 1. Introduction ====
+Read the note above if you haven't already.
The "atomic sleep" problem happens in kernels when a piece of code that executes
with interrupts/preemption disabled ("in atomic context") calls something that
causes the scheduler to be invoked. For example, in Linux...

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