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10bde81c74
The wakeup in preemptive (wip) monitor verifies if the
wakeup events always take place with preemption disabled:
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v
#==================#
H preemptive H <+
#==================# |
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| preempt_disable | preempt_enable
v |
sched_waking +------------------+ |
+--------------- | | |
| | non_preemptive | |
+--------------> | | -+
+------------------+
The wakeup event always takes place with preemption disabled because
of the scheduler synchronization. However, because the preempt_count
and its trace event are not atomic with regard to interrupts, some
inconsistencies might happen.
The documentation illustrates one of these cases.
Link: https://lkml.kernel.org/r/c98ca678df81115fddc04921b3c79720c836b18f.1659052063.git.bristot@kernel.org
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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config DA_MON_EVENTS
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bool
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config DA_MON_EVENTS_IMPLICIT
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select DA_MON_EVENTS
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bool
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config DA_MON_EVENTS_ID
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select DA_MON_EVENTS
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bool
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menuconfig RV
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bool "Runtime Verification"
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depends on TRACING
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help
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Enable the kernel runtime verification infrastructure. RV is a
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lightweight (yet rigorous) method that complements classical
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exhaustive verification techniques (such as model checking and
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theorem proving). RV works by analyzing the trace of the system's
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actual execution, comparing it against a formal specification of
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the system behavior.
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For further information, see:
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Documentation/trace/rv/runtime-verification.rst
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config RV_MON_WIP
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depends on RV
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depends on PREEMPT_TRACER
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select DA_MON_EVENTS_IMPLICIT
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bool "wip monitor"
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help
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Enable wip (wakeup in preemptive) sample monitor that illustrates
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the usage of per-cpu monitors, and one limitation of the
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preempt_disable/enable events.
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For further information, see:
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Documentation/trace/rv/monitor_wip.rst
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config RV_REACTORS
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bool "Runtime verification reactors"
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default y
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depends on RV
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help
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Enables the online runtime verification reactors. A runtime
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monitor can cause a reaction to the detection of an exception
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on the model's execution. By default, the monitors have
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tracing reactions, printing the monitor output via tracepoints,
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but other reactions can be added (on-demand) via this interface.
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