kernel/linux.git/include/trace/events/power.h, branch v6.19.11

PM: Introduce new PMSG_POWEROFF event

2025-11-14T16:05:53+00:00

PMSG_POWEROFF will be used for the PM core to allow differentiating between a hibernation or shutdown sequence when re-using callbacks for common code. Hibernation is started by writing a hibernation method (such as 'platform' 'shutdown', or 'reboot') to use into /sys/power/disk and writing 'disk' to /sys/power/state. Shutdown is initiated with the reboot() syscall with arguments on whether to halt the system or power it off. Tested-by: Eric Naim Signed-off-by: Mario Limonciello (AMD) Link: https://patch.msgid.link/20251112224025.2051702-2-superm1@kernel.org Signed-off-by: Rafael J. Wysocki

PM: tracing: Hide power_domain_target event under ARCH_OMAP2PLUS

2025-07-21T20:40:57+00:00

The power_domain_target event event is only called when CONFIG_OMAP2PLUS is defined. As each event can take up to 5K regardless if they are used or not, it's best not to define them when they are not used. Add #ifdef around these events when they are not used. Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Mathieu Desnoyers Cc: Andrew Morton Cc: Viresh Kumar Cc: Madhavan Srinivasan Cc: Michael Ellerman Link: https://lore.kernel.org/20250612145408.415483176@goodmis.org Acked-by: Rafael J. Wysocki Signed-off-by: Steven Rostedt (Google)

PM: tracing: Hide device_pm_callback events under PM_SLEEP

2025-07-21T20:40:57+00:00

The events device_pm_callback_start and device_pm_callback_end events are only called when CONFIG_PM_SLEEP is defined. As each event can take up to 5K regardless if they are used or not, it's best not to define them when they are not used. Add #ifdef around these events when they are not used. Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Mathieu Desnoyers Cc: Andrew Morton Cc: Viresh Kumar Cc: Madhavan Srinivasan Cc: Michael Ellerman Link: https://lore.kernel.org/20250612145408.246703478@goodmis.org Acked-by: Rafael J. Wysocki Signed-off-by: Steven Rostedt (Google)

PM: tracing: Hide psci_domain_idle events under ARM_PSCI_CPUIDLE

2025-07-21T20:40:56+00:00

The events psci_domain_idle_enter and psci_domain_idle_exit events are only called when CONFIG_ARM_PSCI_CPUIDLE is defined. As each event can take up to 5K (less for DEFINE_EVENT()) regardless if they are used or not, it's best not to define them when they are not used. Add #ifdef around these events when they are not used. Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Mathieu Desnoyers Cc: Andrew Morton Cc: Viresh Kumar Cc: Madhavan Srinivasan Cc: Michael Ellerman Link: https://lore.kernel.org/20250612145408.074769245@goodmis.org Acked-by: Rafael J. Wysocki Signed-off-by: Steven Rostedt (Google)

PM: cpufreq: powernv/tracing: Move powernv_throttle trace event

2025-07-21T20:40:56+00:00

As the trace event powernv_throttle is only used by the powernv code, move it to a separate include file and have that code directly enable it. Trace events can take up around 5K of memory when they are defined regardless if they are used or not. It wastes memory to have them defined in configurations where the tracepoint is not used. Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Mathieu Desnoyers Cc: Andrew Morton Cc: Madhavan Srinivasan Cc: Michael Ellerman Link: https://lore.kernel.org/20250612145407.906308844@goodmis.org Fixes: 0306e481d479a ("cpufreq: powernv/tracing: Add powernv_throttle tracepoint") Acked-by: Viresh Kumar Acked-by: Rafael J. Wysocki Signed-off-by: Steven Rostedt (Google)

tracing: PM: Remove unused clock events

2025-06-07T00:25:56+00:00

The events clock_enable, clock_disable, and clock_set_rate were added back in 2010. In 2011 they were used by the arm architecture but removed in 2013. These events add around 7K of memory which was wasted for the last 12 years. Remove them. Link: https://lore.kernel.org/all/20250529130138.544ffec4@gandalf.local.home/ Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Kajetan Puchalski Acked-by: Rafael J. Wysocki Link: https://lore.kernel.org/20250605162106.1a459dad@gandalf.local.home Fixes: 74704ac6ea402 ("tracing, perf: Add more power related events") Signed-off-by: Steven Rostedt (Google)

cpuidle: psci: Add trace for PSCI domain idle

2025-02-17T13:41:56+00:00

The trace event cpu_idle provides insufficient information for debugging PSCI requests due to lacking access to determined PSCI domain idle states. The cpu_idle usually only shows -1, 0, or 1 regardless how many idle states the power domain has. Add new trace events namely psci_domain_idle_enter and psci_domain_idle_exit to trace enter and exit events with a determined idle state. These new trace events will help developers debug CPUidle issues on ARM systems using PSCI by providing more detailed information about the requested idle states. Signed-off-by: Keita Morisaki Reviewed-by: Steven Rostedt (Google) Reviewed-by: Dhruva Gole Tested-by: Kevin Hilman Acked-by: Sudeep Holla Link: https://lore.kernel.org/r/20250210055828.1875372-1-keyz@google.com Signed-off-by: Ulf Hansson

tracing/treewide: Remove second parameter of __assign_str()

2024-05-23T00:14:47+00:00

With the rework of how the __string() handles dynamic strings where it saves off the source string in field in the helper structure[1], the assignment of that value to the trace event field is stored in the helper value and does not need to be passed in again. This means that with: __string(field, mystring) Which use to be assigned with __assign_str(field, mystring), no longer needs the second parameter and it is unused. With this, __assign_str() will now only get a single parameter. There's over 700 users of __assign_str() and because coccinelle does not handle the TRACE_EVENT() macro I ended up using the following sed script: git grep -l __assign_str | while read a ; do sed -e 's/$__assign_str([^,]*[^ ,]$ *,[^;]*/\1)/' $a > /tmp/test-file; mv /tmp/test-file $a; done I then searched for __assign_str() that did not end with ';' as those were multi line assignments that the sed script above would fail to catch. Note, the same updates will need to be done for: __assign_str_len() __assign_rel_str() __assign_rel_str_len() I tested this with both an allmodconfig and an allyesconfig (build only for both). [1] https://lore.kernel.org/linux-trace-kernel/20240222211442.634192653@goodmis.org/ Link: https://lore.kernel.org/linux-trace-kernel/20240516133454.681ba6a0@rorschach.local.home Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Linus Torvalds Cc: Julia Lawall Signed-off-by: Steven Rostedt (Google) Acked-by: Jani Nikula Acked-by: Christian König for the amdgpu parts. Acked-by: Thomas Hellström #for Acked-by: Rafael J. Wysocki # for thermal Acked-by: Takashi Iwai Acked-by: Darrick J. Wong # xfs Tested-by: Guenter Roeck

cpuidle: Add cpu_idle_miss trace event

2022-08-03T15:50:58+00:00

Add a trace event for cpuidle to track missed (too deep or too shallow) wakeups. After each wakeup, CPUIdle already computes whether the entered state was optimal, above or below the desired one and updates the relevant counters. This patch makes it possible to trace those events in addition to just reading the counters. The patterns of types and percentages of misses across different workloads appear to be very consistent. This makes the trace event very useful for comparing the relative correctness of different CPUIdle governors for different types of workloads, or for finding the optimal governor for a given device. Signed-off-by: Kajetan Puchalski Reviewed-by: Steven Rostedt (Google) Signed-off-by: Rafael J. Wysocki

cpuidle: haltpoll: Add trace points for guest_halt_poll_ns grow/shrink

2022-06-14T14:01:35+00:00

Add trace points as are implemented in KVM host halt polling. This helps tune guest halt polling params. Signed-off-by: Eiichi Tsukata Acked-by: Marcelo Tosatti Signed-off-by: Rafael J. Wysocki