The /dev/oprofile/ directory contains
the file system for OProfile. Use the cat
command to display the values of the virtual files in this file
system. For example, the following command displays the type of
processor OProfile detected:
cat /dev/oprofile/cpu_type
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A directory exists in /dev/oprofile/
for each counter. For example, if there are 2 counters, the
directories /dev/oprofile/0/ and
dev/oprofile/1/ exist.
Each directory for a counter contains the following files:
-
count — The interval between
samples.
-
enabled — If 0, the counter is
off and no samples are collected for it; if 1, the counter is on
and samples are being collected for it.
-
event — The event to
monitor.
-
kernel — If 0, samples are not
collected for this counter event when the processor is in
kernel-space; if 1, samples are collected even if the processor is
in kernel-space.
-
unit_mask — Defines which unit
masks are enabled for the counter.
-
user — If 0, samples are not
collected for the counter event when the processor is in
user-space; if 1, samples are collected even if the processor is in
user-space.
The values of these files can be retrieved with the cat command. For example:
cat /dev/oprofile/0/count
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