Looks like `perf` doesn't understand a path /usr/lib/debug/.build-id/ See: https://gist.github.com/evverx/bd0a6748f3c6254d2021#perf-probe Environment: https://gist.github.com/evverx/bd0a6748f3c6254d2021#environment
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1039998 Title: perf top (linux-tools) cannot find debug info for some gstreamer plugins Status in linux package in Ubuntu: Confirmed Bug description: When tracking down performance problems in a GStreamer app, I noticed that the "perf top" command cannot resolve symbols in most GStreamer plugins, even though the debug packages are installed. Whereas gdb has no problem finding the symbols. % sudo apt-get install --no-install-recommends linux-tools gstreamer0.10-tools gstreamer0.10-plugins-good % sudo apt-get install --no-install-recommends libc6-dbg libglib2.0-0-dbg libgstreamer0.10-0-dbg gstreamer0.10-plugins-good-dbg Launch pipeline: % gst-launch-0.10 filesrc location=/dev/zero \! audio/x-raw-int, rate=8000, channels=1 \! alawenc \! fakesink And then monitor with perf in another terminal: % sudo perf top The status bar displays: no symbols found in /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstalaw.so, maybe install a debug package? However, gdb can successfully find the symbols for this library: % gdb /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstalaw.so [...] Reading symbols from /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstalaw.so...Reading symbols from /usr/lib/debug/.build-id/34/5c9aa83c5e63082d994b6cc1436a561abdeb32.debug...done. (gdb) break gst_alaw_enc_getcaps Breakpoint 1 at 0x1860: file alaw-encode.c, line 301. --- AlsaDevices: total 0 crw-rw---T 1 root audio 116, 1 Aug 22 12:45 seq crw-rw---T 1 root audio 116, 33 Aug 22 12:45 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.0.1-0ubuntu12 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 12.04 HibernationDevice: RESUME=UUID=8ee1fbdd-440b-4174-9215-0b1b4bfce230 InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1) IwConfig: lo no wireless extensions. eth0 no wireless extensions. Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: Bochs Bochs Package: linux (not installed) PciMultimedia: ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/usr/bin/zsh ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-virtual root=UUID=45dc8a54-713d-4d80-8ed8-8cc100335e08 ro quiet ProcVersionSignature: Ubuntu 3.2.0-29.46-virtual 3.2.24 RelatedPackageVersions: linux-restricted-modules-3.2.0-29-virtual N/A linux-backports-modules-3.2.0-29-virtual N/A linux-firmware 1.79 RfKill: Error: [Errno 2] No such file or directory Tags: precise Uname: Linux 3.2.0-29-virtual x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: dmi.bios.date: 01/01/2007 dmi.bios.vendor: Bochs dmi.bios.version: Bochs dmi.chassis.type: 1 dmi.chassis.vendor: Bochs dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr: dmi.product.name: Bochs dmi.sys.vendor: Bochs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1039998/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
