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In preparation of not descheduling perf counters
Instead use the ioctls. In the pingpong test case this gives 15-20% performance improvement for recording.
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Merged. Thanks!!! |
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One further improvement would be to avoid disabling and reenabling performance counters in more cases. In theory we shouldn't need to do it at all, we should only need to reset the period sometimes. |
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This rebases the first two commits of #1754 (and detects old kernels where IOC_PERIOD is broken). As noted in #1778, this gives a decent amount of performance improvement in context switch dominated test cases. There may be additional incremental improvements possible, but this gives the bulk of the savings in a relatively straightforward manner.