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| /freebsd-9.3-release/tools/sched/ | ||
| H A D | schedgraph.py | diff 166209 Wed Jan 24 19:19:56 MST 2007 jeff - Add a horrible bit of code to detect tsc differences between processors. This only works if there is no significant drift and all processors are running at the same frequency. Fortunately, schedgraph traces on MP machines tend to cover less than a second so drift shouldn't be an issue. - KTRFile::synchstamp() iterates once over the whole list to determine the lowest tsc value and syncs adjusts all other values to match. We assume that the first tick recorded on all cpus happened at the same instant to start with. - KTRFile::monostamp() iterates again over the whole file and checks for a cpu agnostic monotonically increasing clock. If the time ever goes backwards the cpu responsible is adjusted further to fit. This will make the possible incorrect delta between cpus as small as the shortest time between two events. This time can be fairly large due to sched_lock essentially protecting all events. - KTRFile::checkstamp() now returns an adjusted timestamp. - StateEvent::draw() detects states that occur out of order in time and draws them as 0 pixels after printing a warning. |
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