diff options
| author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2021-07-18 11:07:53 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-08-12 13:35:56 -0400 |
| commit | d03721a6e7e8c04261873b3840daa3ce2c5b0543 (patch) | |
| tree | 1ab51271bc205f023cee12169affe821211f186e /kernel | |
| parent | 7b40066c97ec66a44e388f82fcf694987451768f (diff) | |
trace/osnoise: Add a header with PREEMPT_RT additional fields
Some extra flags are printed to the trace header when using the
PREEMPT_RT config. The extra flags are: need-resched-lazy,
preempt-lazy-depth, and migrate-disable.
Without printing these fields, the osnoise specific fields are
shifted by three positions, for example:
# tracer: osnoise
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth MAX
# || / SINGLE Interference counters:
# |||| RUNTIME NOISE %% OF CPU NOISE +-----------------------------+
# TASK-PID CPU# |||| TIMESTAMP IN US IN US AVAILABLE IN US HW NMI IRQ SIRQ THREAD
# | | | |||| | | | | | | | | | |
<...>-741 [000] ....... 1105.690909: 1000000 234 99.97660 36 21 0 1001 22 3
<...>-742 [001] ....... 1105.691923: 1000000 281 99.97190 197 7 0 1012 35 14
<...>-743 [002] ....... 1105.691958: 1000000 1324 99.86760 118 11 0 1016 155 143
<...>-744 [003] ....... 1105.691998: 1000000 109 99.98910 21 4 0 1004 33 7
<...>-745 [004] ....... 1105.692015: 1000000 2023 99.79770 97 37 0 1023 52 18
Add a new header for osnoise with the missing fields, to be used
when the PREEMPT_RT is enabled.
Link: https://lkml.kernel.org/r/1f03289d2a51fde5a58c2e7def063dc630820ad1.1626598844.git.bristot@kernel.org
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_osnoise.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index a7e3c24dee13..03ef720b491d 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -253,6 +253,7 @@ static struct osnoise_data { */ static bool osnoise_busy; +#ifdef CONFIG_PREEMPT_RT /* * Print the osnoise header info. */ @@ -261,6 +262,35 @@ static void print_osnoise_headers(struct seq_file *s) if (osnoise_data.tainted) seq_puts(s, "# osnoise is tainted!\n"); + seq_puts(s, "# _-------=> irqs-off\n"); + seq_puts(s, "# / _------=> need-resched\n"); + seq_puts(s, "# | / _-----=> need-resched-lazy\n"); + seq_puts(s, "# || / _----=> hardirq/softirq\n"); + seq_puts(s, "# ||| / _---=> preempt-depth\n"); + seq_puts(s, "# |||| / _--=> preempt-lazy-depth\n"); + seq_puts(s, "# ||||| / _-=> migrate-disable\n"); + + seq_puts(s, "# |||||| / "); + seq_puts(s, " MAX\n"); + + seq_puts(s, "# ||||| / "); + seq_puts(s, " SINGLE Interference counters:\n"); + + seq_puts(s, "# ||||||| RUNTIME "); + seq_puts(s, " NOISE %% OF CPU NOISE +-----------------------------+\n"); + + seq_puts(s, "# TASK-PID CPU# ||||||| TIMESTAMP IN US "); + seq_puts(s, " IN US AVAILABLE IN US HW NMI IRQ SIRQ THREAD\n"); + + seq_puts(s, "# | | | ||||||| | | "); + seq_puts(s, " | | | | | | | |\n"); +} +#else /* CONFIG_PREEMPT_RT */ +static void print_osnoise_headers(struct seq_file *s) +{ + if (osnoise_data.tainted) + seq_puts(s, "# osnoise is tainted!\n"); + seq_puts(s, "# _-----=> irqs-off\n"); seq_puts(s, "# / _----=> need-resched\n"); seq_puts(s, "# | / _---=> hardirq/softirq\n"); @@ -279,6 +309,7 @@ static void print_osnoise_headers(struct seq_file *s) seq_puts(s, "# | | | |||| | | "); seq_puts(s, " | | | | | | | |\n"); } +#endif /* CONFIG_PREEMPT_RT */ /* * osnoise_taint - report an osnoise error. |