Lingutla Chandrasekhar f4bf3ca2e5 softirq: Add trace points for tasklet entry/exit ... Tasklets are supposed to finish their work quickly and should not block the current running process, but it is not guaranteed that they do so. Currently softirq_entry/exit can be used to analyse the total tasklets execution time, but that's not helpful to track individual tasklets execution time. That makes it hard to identify tasklet functions, which take more time than expected. Add tasklet_entry/exit trace point support to track individual tasklet execution. Trivial usage example: # echo 1 > /sys/kernel/debug/tracing/events/irq/tasklet_entry/enable # echo 1 > /sys/kernel/debug/tracing/events/irq/tasklet_exit/enable # cat /sys/kernel/debug/tracing/trace # tracer: nop # # entries-in-buffer/entries-written: 4/4 #P:4 # # _-----=> irqs-off/BH-disabled # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / _-=> migrate-disable # |||| / delay # TASK-PID CPU# ||||| TIMESTAMP FUNCTION # | | | ||||| | | <idle>-0 [003] ..s1. 314.011428: tasklet_entry: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func <idle>-0 [003] ..s1. 314.011432: tasklet_exit: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func <idle>-0 [003] ..s1. 314.017369: tasklet_entry: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func <idle>-0 [003] ..s1. 314.017371: tasklet_exit: tasklet=0xffffa01ef8db2740 function=tcp_tasklet_func Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org> Signed-off-by: J. Avila <elavila@google.com> Signed-off-by: John Stultz <jstultz@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20230407230526.1685443-1-jstultz@google.com [elavila: Port to android-mainline] [jstultz: Rebased to upstream, cut unused trace points, added comments for the tracepoints, reworded commit]		2023-04-15 10:17:16 +02:00
..
events	softirq: Add trace points for tasklet entry/exit	2023-04-15 10:17:16 +02:00
misc	NFSD: add CB_RECALL_ANY tracepoints	2022-12-10 11:01:12 -05:00
stages	tracing updates for 6.3:	2023-02-23 10:20:49 -08:00
bpf_probe.h	bpf/tracing: Use stage6 of tracing to not duplicate macros	2023-01-25 10:31:24 -05:00
define_custom_trace.h
define_trace.h
perf.h	perf/tracing: Use stage6 of tracing to not duplicate macros	2023-01-25 10:31:24 -05:00
syscall.h
trace_custom_events.h
trace_events.h