Messages in this thread | | | From | Andi Kleen <> | Subject | Adding MSR trace points, new edition | Date | Tue, 20 Oct 2015 11:40:42 -0700 |
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For debugging perf it's very useful to trace CPU MSR read / writes. perf has a hackish way to do it, but it does not support reads, requires hacking a header file, and cannot be used with triggers.
MSR accesses are inlined, which makes it difficult to directly add trace points to them.
I posted a patch some time ago that moved them out of line to make it possible to trace them.
Steven proposed a different approach of open coding the trace point static key access. This patchkit implements the different approach.
To avoid include loops, it required some changes in the trace point and in the x86 headers. These can be considered cleanups in thri own. This is implemented in the first two patches.
Then the later patch adds the actual trace points, and a pretty printing script for them, and then finally removes the old hackish perf MSR tracing.
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