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Measure latency of PMC interruptions

Description

Measure latency of PMC interruptions

Add HWPMC events to measure latency.
Provide sysctl to choose the number of outstanding events which
trigger HWPMC event.

Obtained from: Semihalf
Sponsored by: Stormshield
Differential revision: https://reviews.freebsd.org/D31283

Details

Provenance
wmaAuthored on Sep 13 2021, 4:08 AM
Differential Revision
D31283: Measure latency of PMC interruptions
Parents
R10:b864b67a0d19: socket: Do not include control messages in FIONREAD return value
Branches
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