RV now supports nested monitors, this functionality requires a container
monitor, which has virtually no functionality besides holding other
monitors, and nested monitors, that have a container as parent.
Nested monitors' sysfs folders are physically nested in the container's
folder, and they are listed in the available_monitors file with the
notation container:monitor.
These changes go against the assumption that each line in the
available_monitors file correspond to a folder in the rv directory,
breaking the functionality of the rv tool.
Add support for nested containers in the rv userspace tool, indenting
nested monitors while listed and allowing both the notation with and
without container name, which are equivalent:
# rv list
mon1
mon2
container:
- nested1
- nested2
## notation with container name
# rv mon container:nested1
## notation without container name
# rv mon nested1
Either way, enabling a nested monitor is the same as enabling any other
non-nested monitor.
Selecting the container with rv mon enables all the nested monitors, if
-t is passed, the trace also includes the monitor name next to the
event:
# rv mon nested1 -t
<idle>-0 [004] event state1 x event -> state2
<idle>-0 [004] error event not expected in state2
# rv mon sched -t
<idle>-0 [004] event_nested1 state1 x event -> state2
<idle>-0 [004] error_nested1 event not expected in state2
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Link: https://lore.kernel.org/20250305140406.350227-7-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Add the following tracepoints:
* sched_entry(bool preempt, ip)
Called while entering __schedule
* sched_exit(bool is_switch, ip)
Called while exiting __schedule
* sched_set_state(task, curr_state, state)
Called when a task changes its state (to and from running)
These tracepoints are useful to describe the Linux task model and are
adapted from the patches by Daniel Bristot de Oliveira
(https://bristot.me/linux-task-model/).
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Link: https://lore.kernel.org/20250305140406.350227-2-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This is the (user-space) runtime verification tool, named rv.
This tool aims to be the interface for in-kernel rv monitors, as
well as the home for monitors in user-space (online asynchronous),
and in *eBPF.
The tool receives a command as the first argument, the current
commands are:
list - list all available monitors
mon - run a given monitor
Each monitor is an independent piece of software inside the
tool and can have their own arguments.
There is no monitor implemented in this patch, it only
adds the basic structure of the tool, based on rtla.
# rv --help
rv version 6.1.0-rc4: help
usage: rv command [-h] [command_options]
-h/--help: print this menu
command: run one of the following command:
list: list all available monitors
mon: run a monitor
[command options]: each command has its own set of options
run rv command -h for further information
*dot2bpf is the next patch set, depends on this, doing cleanups.
Link: https://lkml.kernel.org/r/fb51184f3b95aea0d7bfdc33ec09f4153aee84fa.1668180100.git.bristot@kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
