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Message-ID: <20250219134210.51bdf447@gandalf.local.home> Date: Wed, 19 Feb 2025 13:42:10 -0500 From: Steven Rostedt <rostedt@...dmis.org> To: Jemmy Wong <jemmywong512@...il.com> Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Mark Rutland <mark.rutland@....com>, Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org Subject: Re: [PATCH 1/2] sched: Refine scheduler naming for clarity and specificity On Thu, 20 Feb 2025 02:20:19 +0800 Jemmy Wong <jemmywong512@...il.com> wrote: > +++ b/Documentation/trace/ftrace.rst > @@ -986,14 +986,14 @@ why a latency happened. Here is a typical trace:: > # => ended at: _raw_spin_unlock_irqrestore > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / What exactly did you change for all these header updates? -- Steve > ps-6143 2d... 0us!: trace_hardirqs_off <-__lock_task_sighand > ps-6143 2d..1 259us+: trace_hardirqs_on <-_raw_spin_unlock_irqrestore > ps-6143 2d..1 263us+: time_hardirqs_on <-_raw_spin_unlock_irqrestore > @@ -1490,14 +1490,14 @@ an example:: > # => ended at: run_timer_softirq > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > <idle>-0 0d.s2 0us+: _raw_spin_lock_irq <-run_timer_softirq > <idle>-0 0dNs3 17us : _raw_spin_unlock_irq <-run_timer_softirq > <idle>-0 0dNs3 17us+: trace_hardirqs_on <-run_timer_softirq > @@ -1541,14 +1541,14 @@ function-trace, we get a much larger output:: > # => ended at: ata_scsi_queuecmd > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > bash-2042 3d... 0us : _raw_spin_lock_irqsave <-ata_scsi_queuecmd > bash-2042 3d... 0us : add_preempt_count <-_raw_spin_lock_irqsave > bash-2042 3d..1 1us : ata_scsi_find_dev <-ata_scsi_queuecmd > @@ -1689,14 +1689,14 @@ is much like the irqsoff tracer. > # => ended at: do_IRQ > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > sshd-1991 1d.h. 0us+: irq_enter <-do_IRQ > sshd-1991 1d..1 46us : irq_exit <-do_IRQ > sshd-1991 1d..1 47us+: trace_preempt_on <-do_IRQ > @@ -1727,14 +1727,14 @@ was over. > # => ended at: task_rq_unlock > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > bash-1994 1d..1 0us : _raw_spin_lock_irqsave <-wake_up_new_task > bash-1994 1d..1 0us : select_task_rq_fair <-select_task_rq > bash-1994 1d..1 1us : __rcu_read_lock <-select_task_rq_fair > @@ -1841,14 +1841,14 @@ tracers. > # => ended at: ata_scsi_queuecmd > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > ls-2230 3d... 0us+: _raw_spin_lock_irqsave <-ata_scsi_queuecmd > ls-2230 3...1 100us : _raw_spin_unlock_irqrestore <-ata_scsi_queuecmd > ls-2230 3...1 101us+: trace_preempt_on <-ata_scsi_queuecmd > @@ -1894,14 +1894,14 @@ Here is a trace with function-trace set:: > # => ended at: mutex_unlock > # > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > kworker/-59 3...1 0us : __schedule <-schedule > kworker/-59 3d..1 0us : rcu_preempt_qs <-rcu_note_context_switch > kworker/-59 3d..1 1us : add_preempt_count <-_raw_spin_lock_irq > @@ -1987,7 +1987,7 @@ wakeup > One common case that people are interested in tracing is the > time it takes for a task that is woken to actually wake up. > Now for non Real-Time tasks, this can be arbitrary. But tracing > -it nonetheless can be interesting. > +it nonetheless can be interesting. > > Without function tracing:: > > @@ -2007,14 +2007,14 @@ Without function tracing:: > # | task: kworker/3:1H-312 (uid:0 nice:-20 policy:0 rt_prio:0) > # ----------------- > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > <idle>-0 3dNs7 0us : 0:120:R + [003] 312:100:R kworker/3:1H > <idle>-0 3dNs7 1us+: ttwu_do_activate.constprop.87 <-try_to_wake_up > <idle>-0 3d..3 15us : __schedule <-schedule > @@ -2076,14 +2076,14 @@ Instead of performing an 'ls', we will run 'sleep 1' under > # | task: sleep-2389 (uid:0 nice:0 policy:1 rt_prio:5) > # ----------------- > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | / > <idle>-0 3d.h4 0us : 0:120:R + [003] 2389: 94:R sleep > <idle>-0 3d.h4 1us+: ttwu_do_activate.constprop.87 <-try_to_wake_up > <idle>-0 3d..3 5us : __schedule <-schedule > @@ -2125,19 +2125,19 @@ Doing the same with chrt -r 5 and function-trace set. > # | task: sleep-2448 (uid:0 nice:0 policy:1 rt_prio:5) > # ----------------- > # > - # _------=> CPU# > - # / _-----=> irqs-off > - # | / _----=> need-resched > - # || / _---=> hardirq/softirq > - # ||| / _--=> preempt-depth > - # |||| / delay > - # cmd pid ||||| time | caller > - # \ / ||||| \ | / > + # _------=> CPU# > + # / _-----=> irqs-off > + # | / _----=> need-resched > + # || / _---=> hardirq/softirq > + # ||| / _--=> preempt-depth > + # |||| / delay > + # cmd pid ||||| time | caller > + # \ / ||||| \ | /
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