profile-manual: Added oprofile usage section.
No re-writing at all. (From yocto-docs rev: f42230e3665903a7603212696949241244555f8b) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
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@ -2221,6 +2221,558 @@
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</section>
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</section>
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<section id='profile-manual-oprofile'>
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<title>oprofile</title>
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<para>
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oprofile itself is a command-line application that runs on the
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target system.
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</para>
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<section id='oprofile-setup'>
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<title>Setup</title>
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<para>
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For this section, we'll assume you've already performed the
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basic setup outlined in the
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"<link linkend='profile-manual-general-setup'>General Setup</link>"
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section.
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</para>
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<para>
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For the the section that deals with oprofile from the command-line,
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we assume you've ssh'ed to the host and will be running
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oprofile on the target.
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</para>
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<para>
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oprofileui (oprofile-viewer) is a GUI-based program that runs
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on the host and interacts remotely with the target.
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See the oprofileui section for the exact steps needed to
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install oprofileui on the host.
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</para>
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</section>
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<section id='oprofile-basic-usage'>
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<title>Basic Usage</title>
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<para>
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Oprofile as configured in Yocto is a system-wide profiler
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(i.e. the version in Yocto doesn't yet make use of the
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perf_events interface which would allow it to profile
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specific processes and workloads). It's relies on hardware
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counter support in the hardware (but can fall back to a
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timer-based mode), which means that it doesn't take
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advantage of tracepoints or other event sources for example.
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</para>
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<para>
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It consists of a kernel module that collects samples and a
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userspace daemon that writes the sample data to disk.
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</para>
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<para>
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The 'opcontrol' shell script is used for transparently
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managing these components and starting and stopping
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profiles, and the 'opreport' command is used to
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display the results.
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</para>
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<para>
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The oprofile daemon should already be running, but before
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you start profiling, you may need to change some settings
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and some of these settings may require the daemon not
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be running. One of these settings is the path the the
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vmlinux file, which you'll want to set using the --vmlinux
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option if you want the kernel profiled:
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --vmlinux=/boot/vmlinux-`uname -r`
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The profiling daemon is currently active, so changes to the configuration
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will be used the next time you restart oprofile after a --shutdown or --deinit.
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</literallayout>
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You can check if vmlinux file: is set using opcontrol --status:
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --status
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Daemon paused: pid 1334
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Separate options: library
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vmlinux file: none
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Image filter: none
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Call-graph depth: 6
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</literallayout>
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If it's not, you need to shutdown the daemon, add the setting
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and restart the daemon:
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --shutdown
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Killing daemon.
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root@crownbay:~# opcontrol --vmlinux=/boot/vmlinux-`uname -r`
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root@crownbay:~# opcontrol --start-daemon
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Using default event: CPU_CLK_UNHALTED:100000:0:1:1
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Using 2.6+ OProfile kernel interface.
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Reading module info.
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Using log file /var/lib/oprofile/samples/oprofiled.log
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Daemon started.
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</literallayout>
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If we get the status again we now see our updated settings:
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --status
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Daemon paused: pid 1649
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Separate options: library
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vmlinux file: /boot/vmlinux-3.4.11-yocto-standard
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Image filter: none
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Call-graph depth: 6
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</literallayout>
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We're now in a position to run a profile. For that we used
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'opcontrol --start':
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --start
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Profiler running.
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</literallayout>
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In another window, run our wget workload:
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<literallayout class='monospaced'>
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root@crownbay:~# rm linux-2.6.19.2.tar.bz2; wget <ulink url='http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2'>http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2</ulink>; sync
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Connecting to downloads.yoctoproject.org (140.211.169.59:80)
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linux-2.6.19.2.tar.b 100% |*******************************| 41727k 0:00:00 ETA
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</literallayout>
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To stop the profile we use 'opcontrol --shudown', which not
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only stops the profile but shuts down the daemon as well:
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<literallayout class='monospaced'>
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root@crownbay:~# opcontrol --start
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Stopping profiling.
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Killing daemon.
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</literallayout>
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Oprofile writes sample data to /var/lib/oprofile/samples,
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which you can look at if you're interested in seeing how the
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samples are structured. This is also interesting because
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it's related to how you dive down to get further details
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about specific executables in OProfile.
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</para>
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<para>
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To see the default display output for a profile, simply type
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'opreport', which will show the results using the data in
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/var/lib/oprofile/samples:
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<literallayout class='monospaced'>
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root@crownbay:~# opreport
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WARNING! The OProfile kernel driver reports sample buffer overflows.
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Such overflows can result in incorrect sample attribution, invalid sample
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files and other symptoms. See the oprofiled.log for details.
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You should adjust your sampling frequency to eliminate (or at least minimize)
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these overflows.
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CPU: Intel Architectural Perfmon, speed 1.3e+06 MHz (estimated)
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Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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464365 79.8156 vmlinux-3.4.11-yocto-standard
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65108 11.1908 oprofiled
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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64416 98.9372 oprofiled
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692 1.0628 libc-2.16.so
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36959 6.3526 no-vmlinux
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4378 0.7525 busybox
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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2844 64.9612 libc-2.16.so
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1337 30.5391 busybox
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193 4.4084 ld-2.16.so
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2 0.0457 libnss_compat-2.16.so
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1 0.0228 libnsl-2.16.so
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1 0.0228 libnss_files-2.16.so
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4344 0.7467 bash
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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2657 61.1648 bash
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1665 38.3287 libc-2.16.so
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18 0.4144 ld-2.16.so
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3 0.0691 libtinfo.so.5.9
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1 0.0230 libdl-2.16.so
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3118 0.5359 nf_conntrack
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686 0.1179 matchbox-terminal
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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214 31.1953 libglib-2.0.so.0.3200.4
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114 16.6181 libc-2.16.so
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79 11.5160 libcairo.so.2.11200.2
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78 11.3703 libgdk-x11-2.0.so.0.2400.8
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51 7.4344 libpthread-2.16.so
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45 6.5598 libgobject-2.0.so.0.3200.4
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29 4.2274 libvte.so.9.2800.2
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25 3.6443 libX11.so.6.3.0
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19 2.7697 libxcb.so.1.1.0
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17 2.4781 libgtk-x11-2.0.so.0.2400.8
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12 1.7493 librt-2.16.so
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3 0.4373 libXrender.so.1.3.0
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671 0.1153 emgd
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411 0.0706 nf_conntrack_ipv4
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391 0.0672 iptable_nat
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378 0.0650 nf_nat
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263 0.0452 Xorg
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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106 40.3042 Xorg
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53 20.1521 libc-2.16.so
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31 11.7871 libpixman-1.so.0.27.2
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26 9.8859 emgd_drv.so
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16 6.0837 libemgdsrv_um.so.1.5.15.3226
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11 4.1825 libEMGD2d.so.1.5.15.3226
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9 3.4221 libfb.so
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7 2.6616 libpthread-2.16.so
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1 0.3802 libudev.so.0.9.3
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1 0.3802 libdrm.so.2.4.0
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1 0.3802 libextmod.so
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1 0.3802 mouse_drv.so
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.
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.
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.
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9 0.0015 connmand
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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4 44.4444 libglib-2.0.so.0.3200.4
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2 22.2222 libpthread-2.16.so
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1 11.1111 connmand
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1 11.1111 libc-2.16.so
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1 11.1111 librt-2.16.so
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6 0.0010 oprofile-server
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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3 50.0000 libc-2.16.so
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1 16.6667 oprofile-server
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1 16.6667 libpthread-2.16.so
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1 16.6667 libglib-2.0.so.0.3200.4
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5 8.6e-04 gconfd-2
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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2 40.0000 libdbus-1.so.3.7.2
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2 40.0000 libglib-2.0.so.0.3200.4
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1 20.0000 libc-2.16.so
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</literallayout>
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The output above shows the breakdown or samples by both
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number of samples and percentage for each executable.
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Within an executable, the sample counts are broken down
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further into executable and shared libraries (DSOs) used
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by the executable.
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</para>
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<para>
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To get even more detailed breakdowns by function, we need to
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have the full paths to the DSOs, which we can get by
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using -f with opreport:
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<literallayout class='monospaced'>
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root@crownbay:~# opreport -f
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CPU: Intel Architectural Perfmon, speed 1.3e+06 MHz (estimated)
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Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
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CPU_CLK_UNHALT...|
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samples| %|
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464365 79.8156 /boot/vmlinux-3.4.11-yocto-standard
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65108 11.1908 /usr/bin/oprofiled
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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64416 98.9372 /usr/bin/oprofiled
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692 1.0628 /lib/libc-2.16.so
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36959 6.3526 /no-vmlinux
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4378 0.7525 /bin/busybox
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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2844 64.9612 /lib/libc-2.16.so
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1337 30.5391 /bin/busybox
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193 4.4084 /lib/ld-2.16.so
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2 0.0457 /lib/libnss_compat-2.16.so
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1 0.0228 /lib/libnsl-2.16.so
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1 0.0228 /lib/libnss_files-2.16.so
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4344 0.7467 /bin/bash
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CPU_CLK_UNHALT...|
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samples| %|
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------------------
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2657 61.1648 /bin/bash
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1665 38.3287 /lib/libc-2.16.so
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18 0.4144 /lib/ld-2.16.so
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3 0.0691 /lib/libtinfo.so.5.9
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1 0.0230 /lib/libdl-2.16.so
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.
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.
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.
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</literallayout>
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Using the paths shown in the above output and the -l option to
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opreport, we can see all the functions that have hits in the
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profile and their sample counts and percentages. Here's a
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portion of what we get for the kernel:
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<literallayout class='monospaced'>
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root@crownbay:~# opreport -l /boot/vmlinux-3.4.11-yocto-standard
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CPU: Intel Architectural Perfmon, speed 1.3e+06 MHz (estimated)
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Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
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samples % symbol name
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233981 50.3873 intel_idle
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15437 3.3243 rb_get_reader_page
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14503 3.1232 ring_buffer_consume
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14092 3.0347 mutex_spin_on_owner
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13024 2.8047 read_hpet
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8039 1.7312 sub_preempt_count
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7096 1.5281 ioread32
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6997 1.5068 add_preempt_count
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3985 0.8582 rb_advance_reader
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3488 0.7511 add_event_entry
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3303 0.7113 get_parent_ip
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3104 0.6684 rb_buffer_peek
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2960 0.6374 op_cpu_buffer_read_entry
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2614 0.5629 sync_buffer
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2545 0.5481 debug_smp_processor_id
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2456 0.5289 ohci_irq
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2397 0.5162 memset
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2349 0.5059 __copy_to_user_ll
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2185 0.4705 ring_buffer_event_length
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1918 0.4130 in_lock_functions
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1850 0.3984 __schedule
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1767 0.3805 __copy_from_user_ll_nozero
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1575 0.3392 rb_event_data_length
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1256 0.2705 memcpy
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1233 0.2655 system_call
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1213 0.2612 menu_select
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</literallayout>
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Notice that above we see an entry for the __copy_to_user_ll()
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function that we've looked at with other profilers as well.
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</para>
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<para>
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Here's what we get when we do the same thing for the
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busybox executable:
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<literallayout class='monospaced'>
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CPU: Intel Architectural Perfmon, speed 1.3e+06 MHz (estimated)
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Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
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samples % image name symbol name
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349 8.4198 busybox retrieve_file_data
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308 7.4306 libc-2.16.so _IO_file_xsgetn
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283 6.8275 libc-2.16.so __read_nocancel
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235 5.6695 libc-2.16.so syscall
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233 5.6212 libc-2.16.so clearerr
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215 5.1870 libc-2.16.so fread
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181 4.3667 libc-2.16.so __write_nocancel
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158 3.8118 libc-2.16.so __underflow
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151 3.6429 libc-2.16.so _dl_addr
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150 3.6188 busybox progress_meter
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150 3.6188 libc-2.16.so __poll_nocancel
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148 3.5706 libc-2.16.so _IO_file_underflow@@GLIBC_2.1
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137 3.3052 busybox safe_poll
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125 3.0157 busybox bb_progress_update
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122 2.9433 libc-2.16.so __x86.get_pc_thunk.bx
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95 2.2919 busybox full_write
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81 1.9542 busybox safe_write
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77 1.8577 busybox xwrite
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72 1.7370 libc-2.16.so _IO_file_read
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71 1.7129 libc-2.16.so _IO_sgetn
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67 1.6164 libc-2.16.so poll
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||||
52 1.2545 libc-2.16.so _IO_switch_to_get_mode
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||||
45 1.0856 libc-2.16.so read
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||||
34 0.8203 libc-2.16.so write
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||||
32 0.7720 busybox monotonic_sec
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||||
25 0.6031 libc-2.16.so vfprintf
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||||
22 0.5308 busybox get_mono
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||||
14 0.3378 ld-2.16.so strcmp
|
||||
14 0.3378 libc-2.16.so __x86.get_pc_thunk.cx
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||||
.
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.
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.
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</literallayout>
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Since we recorded the profile with a callchain depth of 6, we
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should be able to see our __copy_to_user_ll() callchains in
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the output, and indeed we can if we search around a bit in
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the 'opreport --callgraph' output:
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<literallayout class='monospaced'>
|
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root@crownbay:~# opreport --callgraph /boot/vmlinux-3.4.11-yocto-standard
|
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|
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392 6.9639 vmlinux-3.4.11-yocto-standard sock_aio_read
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||||
736 13.0751 vmlinux-3.4.11-yocto-standard __generic_file_aio_write
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||||
3255 57.8255 vmlinux-3.4.11-yocto-standard inet_recvmsg
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||||
785 0.1690 vmlinux-3.4.11-yocto-standard tcp_recvmsg
|
||||
1790 31.7940 vmlinux-3.4.11-yocto-standard local_bh_enable
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||||
1238 21.9893 vmlinux-3.4.11-yocto-standard __kfree_skb
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||||
992 17.6199 vmlinux-3.4.11-yocto-standard lock_sock_nested
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||||
785 13.9432 vmlinux-3.4.11-yocto-standard tcp_recvmsg [self]
|
||||
525 9.3250 vmlinux-3.4.11-yocto-standard release_sock
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||||
112 1.9893 vmlinux-3.4.11-yocto-standard tcp_cleanup_rbuf
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||||
72 1.2789 vmlinux-3.4.11-yocto-standard skb_copy_datagram_iovec
|
||||
|
||||
170 0.0366 vmlinux-3.4.11-yocto-standard skb_copy_datagram_iovec
|
||||
1491 73.3038 vmlinux-3.4.11-yocto-standard memcpy_toiovec
|
||||
327 16.0767 vmlinux-3.4.11-yocto-standard skb_copy_datagram_iovec
|
||||
170 8.3579 vmlinux-3.4.11-yocto-standard skb_copy_datagram_iovec [self]
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||||
20 0.9833 vmlinux-3.4.11-yocto-standard copy_to_user
|
||||
|
||||
2588 98.2909 vmlinux-3.4.11-yocto-standard copy_to_user
|
||||
2349 0.5059 vmlinux-3.4.11-yocto-standard __copy_to_user_ll
|
||||
2349 89.2138 vmlinux-3.4.11-yocto-standard __copy_to_user_ll [self]
|
||||
166 6.3046 vmlinux-3.4.11-yocto-standard do_page_fault
|
||||
</literallayout>
|
||||
Remember that by default OProfile sessions are cumulative
|
||||
i.e. if you start and stop a profiling session, then start a
|
||||
new one, the new one will not erase the previous run(s) but
|
||||
will build on it. If you want to restart a profile from scratch,
|
||||
you need to reset:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# opcontrol --reset
|
||||
</literallayout>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id='oprofileui-a-gui-for-oprofile'>
|
||||
<title>OProfileUI - A GUI for OProfile</title>
|
||||
|
||||
<para>
|
||||
Yocto also supports a graphical UI for controlling and viewing
|
||||
OProfile traces, called OProfileUI. To use it, you first need
|
||||
to clone the oprofileui git repo, then configure, build, and
|
||||
install it:
|
||||
<literallayout class='monospaced'>
|
||||
[trz@empanada tmp]$ git clone git://git.yoctoproject.org/oprofileui
|
||||
[trz@empanada tmp]$ cd oprofileui
|
||||
[trz@empanada oprofileui]$ ./autogen.sh
|
||||
[trz@empanada oprofileui]$ sudo make install
|
||||
</literallayout>
|
||||
OprofileUI replaces the 'opreport' functionality with a GUI,
|
||||
and normally doesn't require the user to use 'opcontrol' either.
|
||||
If you want to profile the kernel, however, you need to either
|
||||
use the UI to specify a vmlinux or use 'opcontrol' to specify
|
||||
it on the target:
|
||||
</para>
|
||||
|
||||
<para>
|
||||
First, on the target, check if vmlinux file: is set:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# opcontrol --status
|
||||
</literallayout>
|
||||
If not:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# opcontrol --shutdown
|
||||
root@crownbay:~# opcontrol --vmlinux=/boot/vmlinux-`uname -r`
|
||||
root@crownbay:~# opcontrol --start-daemon
|
||||
</literallayout>
|
||||
Now, start the oprofile UI on the host system:
|
||||
<literallayout class='monospaced'>
|
||||
[trz@empanada oprofileui]$ oprofile-viewer
|
||||
</literallayout>
|
||||
To run a profile on the remote system, first connect to the
|
||||
remote system by pressing the 'Connect' button and supplying
|
||||
the IP address and port of the remote system (the default
|
||||
port is 4224).
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The oprofile server should automatically be started already.
|
||||
If not, the connection will fail and you either typed in the
|
||||
wrong IP address and port (see below), or you need to start
|
||||
the server yourself:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# oprofile-server
|
||||
</literallayout>
|
||||
Or, to specify a specific port:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# oprofile-server --port 8888
|
||||
</literallayout>
|
||||
Once connected, press the 'Start' button and then run the
|
||||
wget workload on the remote system:
|
||||
<literallayout class='monospaced'>
|
||||
root@crownbay:~# rm linux-2.6.19.2.tar.bz2; wget <ulink url='http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2'>http://downloads.yoctoproject.org/mirror/sources/linux-2.6.19.2.tar.bz2</ulink>; sync
|
||||
Connecting to downloads.yoctoproject.org (140.211.169.59:80)
|
||||
linux-2.6.19.2.tar.b 100% |*******************************| 41727k 0:00:00 ETA
|
||||
</literallayout>
|
||||
Once the workload completes, press the 'Stop' button. At that
|
||||
point the OProfile viewer will download the profile files it's
|
||||
collected (this may take some time, especially if the kernel
|
||||
was profiled). While it downloads the files, you should see
|
||||
something like the following:
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<imagedata fileref="figures/oprofileui-downloading.png" width="6in" depth="7in" align="center" scalefit="1" />
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Once the profile files have been retrieved, you should see a
|
||||
list of the processes that were profiled:
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<imagedata fileref="figures/oprofileui-processes.png" width="6in" depth="7in" align="center" scalefit="1" />
|
||||
</para>
|
||||
|
||||
<para>
|
||||
If you select one of them, you should see all the symbols that
|
||||
were hit during the profile. Selecting one of them will show a
|
||||
list of callers and callees of the chosen function in two
|
||||
panes below the top pane. For example, here's what we see
|
||||
when we select __copy_to_user_ll():
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<imagedata fileref="figures/oprofileui-copy-to-user.png" width="6in" depth="7in" align="center" scalefit="1" />
|
||||
</para>
|
||||
|
||||
<para>
|
||||
As another example, we can look at the busybox process and see
|
||||
that the progress meter made a system call:
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<imagedata fileref="figures/oprofileui-busybox.png" width="6in" depth="7in" align="center" scalefit="1" />
|
||||
</para>
|
||||
|
||||
<note>
|
||||
Tying It Together: oprofile does have build options to enable
|
||||
use of the perf_event subsystem and benefit from the perf_event
|
||||
infrastructure by adding support for something other than
|
||||
system-wide profiling i.e. per-process or workload profiling,
|
||||
but the version in danny doesn't yet take advantage of
|
||||
those capabilities.
|
||||
</note>
|
||||
</section>
|
||||
|
||||
<section id='oprofile-documentation'>
|
||||
<title>Documentation</title>
|
||||
|
||||
<para>
|
||||
Yocto already has some information on setting up and using
|
||||
OProfile and oprofileui. As this document doesn't cover
|
||||
everything in detail, it may be worth taking a look at the
|
||||
"<ulink url='&YOCTO_DOCS_DEV_URL;#platdev-oprofile'>Profiling with OProfile</ulink>"
|
||||
section in the Yocto Project Development Manual
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The OProfile manual can be found here:
|
||||
<ulink url='http://oprofile.sourceforge.net/doc/index.html'>OProfile manual</ulink>
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The OProfile website contains links to the above manual and
|
||||
bunch of other items including an extensive set of examples:
|
||||
<ulink url='http://oprofile.sourceforge.net/about/'>About OProfile</ulink>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</section>
|
||||
</chapter>
|
||||
<!--
|
||||
vim: expandtab tw=80 ts=4
|
||||
|
|
Loading…
Reference in New Issue