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hwpmc: Use rdtsc instead of rdtscp for timestamps#2076

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mashtizadeh wants to merge 1 commit intofreebsd:mainfrom
mashtizadeh:hwpmc-rdtsc
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hwpmc: Use rdtsc instead of rdtscp for timestamps#2076
mashtizadeh wants to merge 1 commit intofreebsd:mainfrom
mashtizadeh:hwpmc-rdtsc

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@mashtizadeh
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No need for a barrier here, we are inside an NMI handler and executing a number of serializing instructions with stronger semantics. Reducing this overhead will increase our maximum safe sampling rate.

Sponsored by: Netflix

@mashtizadeh
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@bsdimp

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Thank you for taking the time to contribute to FreeBSD!

There is an issue that needs to be resolved:

  • Missing Signed-off-by lines (df60397)

Note

Please review CONTRIBUTING.md, then update and push your branch again.

No need for a barrier here, we are inside an NMI handler and executing a
number of serializing instructions with stronger semantics. Reducing
this overhead will increase our maximum safe sampling rate.

Sponsored by: Netflix
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