** Also affects: linux (Ubuntu Wily)
Importance: Medium
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Also affects: linux (Ubuntu Vivid)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Vivid)
Status: New => In Progress
** Changed in: linux (Ubuntu Vivid)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux (Ubuntu Wily)
Status: New => In Progress
** Changed in: linux (Ubuntu Wily)
Assignee: Taco Screen team (taco-screen-team) => Tim Gardner (timg-tpi)
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https://bugs.launchpad.net/bugs/1485528
Title:
perf probe: ppc64le/ABIv2 support
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Vivid:
In Progress
Status in linux source package in Wily:
In Progress
Bug description:
Problem Description
========================
perf probe does not work properly on ppc64le
---uname output---
Linux ubuntu1504 3.19.0-22-generic #22-Ubuntu SMP Tue Jun 16 17:15:17 UTC
2015 ppc64le ppc64le ppc64le GNU/Linux
Machine Type = POWER
Steps to Reproduce
========================
'perf probe do_fork' adds the probe, but is not able to capture events on
'perf record -e probe:do_fork -a'. This is because ppc64le ABIv2 uses local
entry points at an offset from the global entry point where the probe is
currently being placed.
These issues have been fixed upstream with the below patch series:
- http://thread.gmane.org/gmane.linux.kernel/1939488
- http://thread.gmane.org/gmane.linux.kernel/1941352
== Comment: #1 - Naveen N. Rao <naveen.n....@in.ibm.com> - 2015-07-01
07:03:19 ==
I have backported the patches relevant for ppc64le and I am attaching them
here. These fixes are needed for 15.04, 14.04.03 and 15.10 (depending on the
kernel it gets based on). For reference, upstream commits in -tip for reference:
- d4c537e6bf860c12262cb936eef663180d7a3d45: perf probe: Ignore tail calls to
probed functions
- 3099c026002e97b8c173d9d0bbdfc39257d14402: perf probe: Improve detection of
file/function name in the probe pattern
- 7b6ff0bdbf4f7f429c2116cca92a6d171217449e: perf probe ppc64le: Fixup
function entry if using kallsyms lookup
- d5c2e2c17ae1d630ddbceb53a264f24cc99703a4: perf probe ppc64le: Prefer symbol
table lookup over DWARF
- c50fc0a43e33a6c3257c5cbb954cd747d7b9a680: perf probe ppc64le: Fix ppc64
ABIv2 symbol decoding
- 031b84c407c3153ffbcb4f8f832edf48af988719: perf probe ppc: Enable matching
against dot symbols automatically
- fb6d59423115b10125f5db6acb8471f6f0af4ad7: perf probe ppc: Use the right
prefix when ignoring SyS symbols on ppc
- d2332098331fffe9358b50cebc8954ecd6560448: perf probe ppc: Fix symbol fixup
issues due to ELF type
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