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Date: Mon, 16 Aug 2021 11:04:16 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Daniel Bristot de Oliveira <bristot@...nel.org>,
Lukas Bulwahn <lukas.bulwahn@...il.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [GIT PULL v2] tracing: Fixes and clean ups for v5.14
Linus,
Did this one fall though the cracks?
It's the same pull request but without the "main" variable change.
-- Steve
On Thu, 12 Aug 2021 14:16:36 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:
> Linus,
>
> [
> Note. This version was only tested with one config and it passed the
> ftracetests in the selftests directory. I didn't run my full test
> suite as that takes forever to run, and the only thing that's
> different from the version that went through that test suite is that
> I dropped the "main" variable "fix" patch.
> ]
>
> Fixes and clean ups to tracing:
>
> - Fix header alignment when PREEMPT_RT is enabled for osnoise tracer
>
> - Inject "stop" event to see where osnoise stopped the trace
>
> - Define DYNAMIC_FTRACE_WITH_ARGS as some code had an #ifdef for it
>
> - Fix erroneous message for bootconfig cmdline parameter
>
> - Fix crash caused by not found variable in histograms
>
>
> Please pull the latest trace-v5.14-rc5-2 tree, which can be found at:
>
>
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> trace-v5.14-rc5-2
>
> Tag SHA1: 26ba5d9bdfa88208677132efa9e64b488420b461
> Head SHA1: 5acce0bff2a0420ce87d4591daeb867f47d552c2
>
>
> Daniel Bristot de Oliveira (3):
> trace/osnoise: Add a header with PREEMPT_RT additional fields
> trace/timerlat: Add a header with PREEMPT_RT additional fields
> trace/osnoise: Print a stop tracing message
>
> Lukas Bulwahn (1):
> tracing: define needed config DYNAMIC_FTRACE_WITH_ARGS
>
> Masami Hiramatsu (1):
> init: Suppress wrong warning for bootconfig cmdline parameter
>
> Steven Rostedt (VMware) (1):
> tracing / histogram: Fix NULL pointer dereference on strcmp() on NULL event name
>
> ----
> init/main.c | 9 +++++--
> kernel/trace/Kconfig | 5 ++++
> kernel/trace/trace_events_hist.c | 2 ++
> kernel/trace/trace_osnoise.c | 56 +++++++++++++++++++++++++++++++++++++++-
> 4 files changed, 69 insertions(+), 3 deletions(-)
> ---------------------------
> diff --git a/init/main.c b/init/main.c
> index f5b8246e8aa1..8d97aba78c3a 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -397,6 +397,12 @@ static int __init bootconfig_params(char *param, char *val,
> return 0;
> }
>
> +static int __init warn_bootconfig(char *str)
> +{
> + /* The 'bootconfig' has been handled by bootconfig_params(). */
> + return 0;
> +}
> +
> static void __init setup_boot_config(void)
> {
> static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
> @@ -475,9 +481,8 @@ static int __init warn_bootconfig(char *str)
> pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
> return 0;
> }
> -early_param("bootconfig", warn_bootconfig);
> -
> #endif
> +early_param("bootconfig", warn_bootconfig);
>
> /* Change NUL term back to "=", to make "param" the whole string. */
> static void __init repair_env_string(char *param, char *val)
> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
> index d567b1717c4c..3ee23f4d437f 100644
> --- a/kernel/trace/Kconfig
> +++ b/kernel/trace/Kconfig
> @@ -219,6 +219,11 @@ config DYNAMIC_FTRACE_WITH_DIRECT_CALLS
> depends on DYNAMIC_FTRACE_WITH_REGS
> depends on HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
>
> +config DYNAMIC_FTRACE_WITH_ARGS
> + def_bool y
> + depends on DYNAMIC_FTRACE
> + depends on HAVE_DYNAMIC_FTRACE_WITH_ARGS
> +
> config FUNCTION_PROFILER
> bool "Kernel function profiler"
> depends on FUNCTION_TRACER
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 949ef09dc537..a48aa2a2875b 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -3430,6 +3430,8 @@ trace_action_create_field_var(struct hist_trigger_data *hist_data,
> event = data->match_data.event;
> }
>
> + if (!event)
> + goto free;
> /*
> * At this point, we're looking at a field on another
> * event. Because we can't modify a hist trigger on
> diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
> index a7e3c24dee13..b61eefe5ccf5 100644
> --- a/kernel/trace/trace_osnoise.c
> +++ b/kernel/trace/trace_osnoise.c
> @@ -253,10 +253,40 @@ static struct osnoise_data {
> */
> static bool osnoise_busy;
>
> +#ifdef CONFIG_PREEMPT_RT
> /*
> * Print the osnoise header info.
> */
> 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");
> @@ -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.
> @@ -323,6 +354,24 @@ static void trace_osnoise_sample(struct osnoise_sample *sample)
> /*
> * Print the timerlat header info.
> */
> +#ifdef CONFIG_PREEMPT_RT
> +static void print_timerlat_headers(struct seq_file *s)
> +{
> + 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, "# |||||| /\n");
> + seq_puts(s, "# ||||||| ACTIVATION\n");
> + seq_puts(s, "# TASK-PID CPU# ||||||| TIMESTAMP ID ");
> + seq_puts(s, " CONTEXT LATENCY\n");
> + seq_puts(s, "# | | | ||||||| | | ");
> + seq_puts(s, " | |\n");
> +}
> +#else /* CONFIG_PREEMPT_RT */
> static void print_timerlat_headers(struct seq_file *s)
> {
> seq_puts(s, "# _-----=> irqs-off\n");
> @@ -336,6 +385,7 @@ static void print_timerlat_headers(struct seq_file *s)
> seq_puts(s, "# | | | |||| | | ");
> seq_puts(s, " | |\n");
> }
> +#endif /* CONFIG_PREEMPT_RT */
>
> /*
> * Record an timerlat_sample into the tracer buffer.
> @@ -1025,9 +1075,13 @@ diff_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *
> /*
> * osnoise_stop_tracing - Stop tracing and the tracer.
> */
> -static void osnoise_stop_tracing(void)
> +static __always_inline void osnoise_stop_tracing(void)
> {
> struct trace_array *tr = osnoise_trace;
> +
> + trace_array_printk_buf(tr->array_buffer.buffer, _THIS_IP_,
> + "stop tracing hit on cpu %d\n", smp_processor_id());
> +
> tracer_tracing_off(tr);
> }
>
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