Home > The Specified > Oprofile Tutorial

Oprofile Tutorial

Contents

Join them; it only takes a minute: Sign up Error while starting Oprofile up vote 0 down vote favorite CPU usage high while running gstreamer, to analyze the issue using oprofile That's fair ;-) In my case, it was cool because I had indeed rebuilt my kernel with the oprofile callgraph patch, so I copied /usr/src/redhat/BUILD/kernel-2.6.9/linux-2.6.9/vmlinux over a local dir and passed So my understanding is that my new kernel (compressed) is /boot/vmlinuz-2.6.9-43.Elsmp and that I'd need to feed oprofile with the equivalent vmlinux file. I have an app that's consuming about half of the CPU but I can't seem to get a sorted list of *where* (including the calling stack trace) that time is being

vmlinux not vmlinuz) Indeed I don't know how to extract vmlinux from vmlinuz. The method is simple, just copy .config under /boot to kernel source directory to overwrite .config. That is critical for my application tuning that I understand where it spends time in the kernel so please hele me achieving this. No limits.

Oprofile Tutorial

Any clue? You should be able to just "cp" or "scp" the file to a place that is visible to the target machine. You should be using that file. How can we get our son to stop sleeping in our bed?

I am not sure how well the stack back tracing works on arm. vmlinux not vmlinuz) I've read online that one must use objcopy to produce the file. (Since this is a cross compile I'm using the cross-objcopy). Sure ! Operf Tutorial Best Regards Cyrille ------------------------------------------------------------------------ - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML.

Also you have to tell oprofile the exact name and the directory where you put it(eg. /boot/vmlinux.X.X.X-syms Hope this helps - Padma -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Maucci, Error: No Sample Files Found: Profile Specification Too Strict ? Do you know some smart way from which I could get the current kernel settings -- if I run make xconfig, the settings displayed is my current kernel settings? 2. asked 7 months ago viewed 112 times Related 9Why are there no debug symbols in my vmlinux when using gdb with /proc/kcore?1Ubuntu 2.6.35 vmlinux image for kernel profiling using oprofile10Extract vmlinux Any one has ideas?

why is Newton's method not widely used in machine learning? Oprofile Ubuntu TBH, back in the days when i was compiling my kernel, i never trusted make install, so i always ran make bzImage and copied the image myself Reply With Quote February So my understanding is that my new kernel (compressed) is /boot/vmlinuz-2.6.9-43.Elsmp and that I'd need to feed oprofile with the equivalent vmlinux file. There has been a lot of reworking of the arm oprofile support to use the perf infrastructure: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=arch/arm/oprofile;hb=HEAD The 2.6.35 kernel uses the perf infrastructure: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=arch/arm/oprofile/common.c;h=c074e66ad224e83d18d1f278afc78aa00e18b494;hb=0f43dd546d991ca260d8a72d07f617907c508de8 Is CONFIG_HW_PERF_EVENTS set in the

Error: No Sample Files Found: Profile Specification Too Strict ?

It is going to depend a lot on which kernel is being used and how the kernel build was configured. As it turns out the one I originally tried was fine once objdump worked. Oprofile Tutorial WEATHER-resistant GFCI's required in bathrooms? Install Oprofile OK, after a yak-shave of epic proportions, this ended up being a borked install of binutils on my target causing objdump to not be able to run.

http://sourceforge.net/powerbar/db2/ _______________________________________________ oprofile-list mailing list [email protected] But the vmlinux- file should exist, anyway. > But firstly I should get the vmlinux, otherwise the following error will pop up: > > The specified file /boot/vmlinux-uname does not seem Then, when running oprofile's autogen.sh, aclocal is called and it looks for a dirlist file in /share/aclocal. The filename itself doesn't matter, does it? No-vmlinux

I have an app that's consuming about half of the CPU but I can't seem to get a sorted list of *where* (including the calling stack trace) that time is being Occasionally, opreport displays messages like the following: warning: [vdso] (tgid:1664 range:0xf732a000-0xf732b000) could not be found If you get this error message, you can safely ignore it. Then, once I realized that specifying a --session-dir=... comment:2 Changed 6 years ago by nbd Resolution set to worksforme Status changed from new to closed You need to use build_dir/linux-ar71xx/linux-*/vmlinux When profiling modules, you should make sure that the

There's a day I won't get back... Opreport If you use this version you must use the OProfile userspace RPM from Red Hat 8.0, not any version from this site. " After having read that, I am wondering whether Do you think it is all right?

Is this a scam?

SUSE kernel, I get: "May 8 11:05:14 mynode kernel: Unable to handle kernel paging request at virtual address ffffe030" This occurs with older SUSE UP kernel when you compile your kernel Just data. This "problem" only occurs if you actively, and mistakenly, configure access to OProfile via sudo. Oprofile Operf How do I reset the profiling data ?

Can someone provide complete guidance on what/how to produce the needed vmlinux? You can check if your hardware is supported by looking at /dev/oprofile/cpu_type. linux-kernel oprofile share|improve this question edited May 7 at 18:07 tinlyx 6,931153573 asked May 5 at 16:24 asd88 34 Did you provide the location of System.map? –Ignacio Vazquez-Abrams May It is usually placed in the top level directory: name "vmlinux" where you did the make to build the linux kernel.

History Link existing bug Create bug report Link to a FAQ Create a new FAQ To post a message you must log in. When using operf for profiling, a new profiling session will cause the current profile data (stored in /oprofile_data/samples/current) to be renamed from current to previous, so there is usually no need For other possible causes for this error message, read What to do when you don't get any results. Then use "--vmlinux=".

How do I get started ? Alternatively, you can re-compile Red Hat's kernel with sys_call_table added. In my kernel build tree I can see /usr/src/redhat/BUILD/kernel-2.6.9/linux-2.6.9/vmlinux which is suspect to be the uncompressed version of the kernel that is now in /boot/vmlinuz-2.6.9-43.Elsmp but even when I pass /usr/src/redhat/BUILD/kernel-2.6.9/linux-2.6.9/vmlinux To get just the image search for the GZ signature - 1f 8b 08 00.

When using legacy opcontrol, the oprofiled daemon must be restarted in order to use newly-specified events and other new profiling parameters. After all, the config file should be identical to the one in /proc/config.gz. Generally this means your kernel supports your hardware, but user space tools are not up to date. Usually, the total of all per-symbols samples for a given binary image equals the summary count for the binary image (shown by running opreport with no options).

Several Linux distributions were released using kernels based on 2.6.31 or 2.6.32 which were heavily patched with perf_events fixes. No limits. My big issue is about how to pass vmlinux to 'opcontrol --vmlinux=3D$myVMlinux'. If you compile your own kernel from Linus's tarball, OProfile should work.

Otherwise, OProfile cannot acquire the RTC hardware for its own use, and you will get this error message.