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(threads, CPU load counters, etc.). Each source is tagged with a group and an order similar to the SYSINIT SI_SUB_* and SI_ORDER_*. After the file is parsed, all the sources are then sorted. Currently, the only affects of this are that the CPU loads are now sorted by CPU ID (so CPU 0 is always first). However, this makes it easier to add new types of event sources in the future and have them all clustered together instead of intertwined with threads. - Python lists perform insertions at the tail much faster than insertions at the head. For a trace that had a lot of events for a single event source, the constant insertions of new events to the head of the per-source event list caused a noticable slow down. To compensate, append new events to the end of the list during parsing and then reverse the list prior to drawing. - Somewhere in the tkinter internals the coordinates of a canvas are stored in a signed 32-bit integer. As a result, if an the box for an event spans 2^31, it would actually end up having a negative X offset at one end. The result was a single box that covered the entire event source. Kris worked around this for some traces by bumping up the initial ticks/pixel ratio from 1 to 10. However, a divisor of 10 can still be too small for large tracefiles (e.g. with 4 million entries). Instead of hardcoding the initial scaling ratio, calculate it from the time span of the trace file. - Add support for using the mouse wheel to scroll the graph window up and down.
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