Debugging with OProfile and Perf-events
Ensure that relevant patches (for perf events and oprofile) are in the release kernel tree(s)
Rally future efforts around this support, for example BSPs
Generate appropriate blueprints/specs for specific areas of development
Blueprint information
- Status:
- Started
- Approver:
- Loïc Minier
- Priority:
- Essential
- Drafter:
- Will Deacon
- Direction:
- Needs approval
- Assignee:
- Will Deacon
- Definition:
- Review
- Series goal:
- Accepted for maverick
- Implementation:
-
Good progress
- Milestone target:
-
ubuntu-10.10-beta
- Started by
- Will Deacon
- Completed by
Whiteboard
Status:
Kernel work complete. Userspace [tool] work in progress.
[dave-martin-arm]: Investigating the perf tools, it looks like supprt for loading separated debug symbols is there, but it has a bug which prevents the symbols being loaded for images under the current directory when running perf report. I'm polling the upstream guys for feedback on the best way to fix this.
Work items (maverick-alpha-2):
[will-deacon] Update OProfile userspace tools: DONE
[will-deacon] Describe BSP modifications required for perf support on wiki page: DONE
[will-deacon] Check if vmlinux file is required for profiling Kernel code with OProfile: DONE
Work items (maverick-alpha-3):
[will-deacon] Enable HAVE_REGS_
[lool] Enable building of linux-tools package for armel targets: DONE
[dave-martin-arm] Teach perf tools to extract debug information from ddebs: DONE
Investigate the potential for cross-profiling [in particular, where the debug symbols / binary are placed]: TODO
Work items (ubuntu-
[dave-martin-arm] Clean up perf tools ddebs patch to work right: DONE
Validate code on supported ARMv7A platforms (note - only done for vexpress): DONE
[jamiebennett 2010-06-01] Need to make sure that this code is validated on appropriate ARMv7A hardware.
[dmart] For discussion:
* Can the perfevents stuff be backported as an SRU to lucid?
* How to get symbol-level profiling information? (are debug symbols / unstripped binaries required)
[will-deacon]: Oprofile needs a vmlinux for Kernel symbol lookup.
[asac 22 Jun 10] massaging this spec a bit to have have concrete scheduling of work items; overall spec is targetted for alpha-3; the validation part is a QA/bug fix task and as that it can go to implemented before thats done.
