On Tue, 7 Jun 2022, Steven Rostedt wrote: > From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx> > > The '-l' option shows latency information of each event. It is not well > documented. Update the man page to show what the cryptic values mean. > > Reported-by: Julia Lawall <julia.lawall@xxxxxxxx> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216069 > Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> > --- > .../trace-cmd/trace-cmd-report.1.txt | 39 +++++++++++++++---- > 1 file changed, 32 insertions(+), 7 deletions(-) > > diff --git a/Documentation/trace-cmd/trace-cmd-report.1.txt b/Documentation/trace-cmd/trace-cmd-report.1.txt > index df60dd87d979..ccf635fb664b 100644 > --- a/Documentation/trace-cmd/trace-cmd-report.1.txt > +++ b/Documentation/trace-cmd/trace-cmd-report.1.txt > @@ -221,13 +221,38 @@ OPTIONS > <idle>-0 0d.h1. 106467.859747: function: ktime_get <-- tick_check_idle > ---- > > - The 0d.h1. denotes this information. The first character is never a '.' > - and represents what CPU the trace was recorded on (CPU 0). The 'd' denotes > - that interrupts were disabled. The 'h' means that this was called inside > - an interrupt handler. The '1' is the preemption disabled (preempt_count) > - was set to one. The two '.'s are "need_resched" flag and kernel lock > - counter. If the "need_resched" flag is set, then that character would be a > - 'N'. > + The 0d.h1. denotes this information. > + > + It starts with a number. This represents the CPU number that the event occurred > + on. > + > + The second character is one of the following: > + > + 'd' - Interrupts are disabled > + '.' - Interrupts are enabled > + 'X' - Has flags that are not yet known by trace-cmd > + > + The third character is the "need rescheduling" flag. > + > + 'N' - A schedule is set to take place > + '.' - No scheduling is set > + > + The forth character represents the context the event was in when it triggered Thanks for the extra detail. Forth should be fourth. julia > + > + 'h' - Hard interrupt context > + 's' - Soft interrupt context > + 'H' - Hard interrupt context that interrupted a soft interrupt > + '.' - Normal context > + > + The next is a number (should be less than 10), that represents the preemption > + depth (the number of times preempt_disable() is called without preempt_enable()). > + '.' means preemption is enabled. > + > + On some systems, "migrate disable" may exist, in which case a number will be > + shown for that, or '.' meaning migration is enabled. > + > + If lockdep in enabled on the system, then the number represents the depth of > + locks that are held when the event triggered. '.' means no locks are held. > > *-w*:: > If both the 'sched_switch' and 'sched_wakeup' events are enabled, then > -- > 2.35.1 > >
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