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The general syntax for [command]#opannotate# is as follows:
 
~]# opannotate --search-dirs src-dir --source executable
 
These command-line options are mandatory. Replace _src-dir_ with a path to the directory containing the source code and specify the executable to be analyzed. See the `opannotate(1)` manual page for a list of additional command line options.
 
[[s1-oprofile-dev-oprofile]]
 
Understanding the /dev/oprofile/ directory
 
indexterm:[OProfile,/dev/oprofile/]indexterm:[/dev/oprofile/] When using OProfile in legacy mode, the `/dev/oprofile/` directory is used to store the file system for OProfile. On the other hand, [command]#operf# does not require `/dev/oprofile/`. Use the [command]#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
 
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.
 
* `extra` — Used on machines with Nehalem processors to further specify 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 [command]#cat# command. For example:
 
~]# cat /dev/oprofile/0/count
 
[[s1-oprofile-example-usage]]
 
Example Usage