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The opid monitor validates that wakeup and need_resched events only occur with interrupts and preemption disabled by following the preemptirq tracepoints. As reported in [1], those tracepoints might be inaccurate in some situations (e.g. NMIs). Since the monitor doesn't validate other ordering properties, remove the dependency on preemptirq tracepoints and convert the monitor to a hybrid automaton to validate the constraint during event handling. This makes the monitor more robust by also removing the workaround for interrupts missing the preemption tracepoints, which was working on PREEMPT_RT only and allows the monitor to be built on kernels without the preemptirqs tracepoints. [1] - https://lore.kernel.org/lkml/20250625120823.60600-1-gmonaco@redhat.com Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://lore.kernel.org/r/20260330111010.153663-8-gmonaco@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
15 lines
361 B
Plaintext
15 lines
361 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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config RV_MON_OPID
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depends on RV
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depends on RV_MON_SCHED
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default y
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select HA_MON_EVENTS_IMPLICIT
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bool "opid monitor"
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help
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Monitor to ensure operations like wakeup and need resched occur with
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interrupts and preemption disabled.
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For further information, see:
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Documentation/trace/rv/monitor_sched.rst
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