powerpc: Instrument Hypervisor Calls
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- v1 Latest3 patches 13 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | powerpc: Instrument Hypervisor Calls: merge headersdrivers/ include/ | +9 | 0 replies | |
| 2/3 | powerpc: Instrument Hypervisor Calls: add wrappersarch/ arch/ arch/ +2 more | +336 | 3 replies | |
| 3/3 | powerpc: Instrument Hypervisor Calls: add debugfs filesarch/ | +91 | 0 replies |
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Cover letter [PATCH 0/3] powerpc: Instrument Hypervisor Calls
Hi Paul,
Here is an updated version of the patch(es) to instrument hcalls. All issues from the previous versions have been addressed. Although, I haven't really discovered an elegant solution to the assembly routine name juggling.
In addition, there has been some discussion of these patches on IRC. Some remaining issues/questions are:
- Exactly how much overhead does the statistic gathering introduce?
- What would be the cost of disabling preemption for more accurate statistics?
- What would be the cost of disabling interrupts for more accurate statistics?
- Should we extend this statistic gathering to RTAS calls?
I would like to get this basic code integrated and then start to address some of these questions. The IBM performance group will help in benchmarking to determine overhead.
Please note that all code is behind a config option (off by default) with zero impact unless enabled.
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Mike