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When in Instrumented Kernel mode, nothing is visibly different. The performance won't noticeably change either. Thus, it can be tough to tell whether you've successfully changed into Instrumented Kernel mode. And forgetting to start the Instrumented Kernel is something we all do once in a while.
To check for Instrumented Kernel mode, type:
ls /proc/boot
If one of the files listed is procnto-*instr, you're successfully running the Instrumented Kernel. But if the file is procnto, you're running the noninstrumented kernel
To start the Instrumented Kernel, see the
Tutorial chapter.
The data-capture utilities require root privileges to allocate
buffer memory or to use functions such as
InterruptHookTrace()
(see the Neutrino Library Reference).
Data-capture utilities won't work properly without these privileges.
Because the tracelogger may write data at rates well in excess
of 20 MB/min, running it for prolonged periods or running it repeatedly
can use up a surprisingly large amount of space.
If disk space is low, wipe old log files regularly.
(In its default mode, tracelogger overwrites its previous
default file.)
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