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The first line is a summary for the symbol/executable combination.
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The first column is the number of samples for the memory symbol. The second column is the percentage of samples for the memory address relative to the total number of samples for the symbol. The third column is the symbol name.
 
[option]`-d`:: This option lists sample data by symbols with more detail than the [option]`-l` option. For example, with the following command:
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[subs="attributes"]
 
~]#{nbsp}opreport -d -i __gconv_transform_utf8_internal /lib/tls/libc-version.so
 
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this output is returned:
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vma samples % symbol name 00a98640 12 100.000 __gconv_transform_utf8_internal 00a98640 1 8.3333 00a9868c 2 16.6667 00a9869a 1 8.3333 00a986c1 1 8.3333 00a98720 1 8.3333 00a98749 1 8.3333 00a98753 1 8.3333 00a98789 1 8.3333 00a98864 1 8.3333 00a98869 1 8.3333 00a98b08 1 8.3333
 
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The data is the same as the [option]`-l` option except that for each symbol, each virtual memory address used is shown. For each virtual memory address, the number of samples and percentage of samples relative to the number of samples for the symbol is displayed.
 
[option]`-e` _symbol-name_pass:attributes[{blank}]…:: With this option, you can exclude some symbols from the output. Replace _symbol-name_ with the comma-separated list of symbols you want to exclude.
 
[option]`session`:pass:attributes[{blank}]_name_:: Here, you can specify the full path to the session, a directory relative to the `/var/lib/oprofile/samples/` directory, or if you are using [command]#operf#, a directory relative to `./oprofile_data/samples/`.
 
[[s2-oprofile-module-output]]
 
Getting More Detailed Output on the Modules
 
indexterm:[OProfile,opreport]indexterm:[OProfile] OProfile collects data on a system-wide basis for kernel- and user-space code running on the machine. However, once a module is loaded into the kernel, the information about the origin of the kernel module is lost. The module could come from the `initrd` file on boot up, the directory with the various kernel modules, or a locally created kernel module. As a result, when OProfile records samples for a module, it just lists the samples for the modules for an executable in the root directory, but this is unlikely to be the place with the actual code for the module. You will need to take some steps to make sure that analysis tools get the proper executable.
 
To get a more detailed view of the actions of the module, you will need to either have the module "`unstripped`" (that is installed from a custom build) or have the [package]*debuginfo* package installed for the kernel.
 
Find out which kernel is running with the [command]#uname -a# command, obtain the appropriate [package]*debuginfo* package and install it on the machine.
 
Then proceed with clearing out the samples from previous runs with the following command:
 
~]# opcontrol --reset
 
To start the monitoring process, for example, on a machine with Westmere processor, run the following command:
 
~]# opcontrol --setup --vmlinux=/usr/lib/debug/lib/modules/`uname -r`/vmlinux \ --event=CPU_CLK_UNHALTED:500000
 
Then the detailed information, for instance, for the ext4 module can be obtained with:
 
~]# opreport /ext4 -l --image-path /lib/modules/`uname -r`/kernel
CPU: Intel Westmere microarchitecture, speed 2.667e+06 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 500000
warning: could not check that the binary file /lib/modules/2.6.32-191.el6.x86_64/kernel/fs/ext4/ext4.ko has not been modified since the profile was taken. Results may be inaccurate.
samples % symbol name
1622 9.8381 ext4_iget
1591 9.6500 ext4_find_entry
1231 7.4665 __ext4_get_inode_loc
783 4.7492 ext4_ext_get_blocks
752 4.5612 ext4_check_dir_entry
644 3.9061 ext4_mark_iloc_dirty
583 3.5361 ext4_get_blocks
583 3.5361 ext4_xattr_get
479 2.9053 ext4_htree_store_dirent
469 2.8447 ext4_get_group_desc
414 2.5111 ext4_dx_find_entry
 
[[s2-oprofile-reading-opannotate]]