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* [for-next][PATCH 00/19] tracing: Updates for 5.15
@ 2021-08-17 19:42 Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 01/19] tracing/boot: Fix a hist trigger dependency for boot time tracing Steven Rostedt
                   ` (17 more replies)
  0 siblings, 18 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel
  Cc: Ingo Molnar, Andrew Morton, Huang Shijie, Masahiro Yamada,
	Masami Hiramatsu, zhaoxiao

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
for-next

Head SHA1: db396be6ddc4b953db3a725e19945fd4f151cfe9


Huang Shijie (1):
      tracing: Fix a typo in tracepoint.h

Masahiro Yamada (2):
      tracing: Simplify the Kconfig dependency of FTRACE
      tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig

Masami Hiramatsu (10):
      tracing/boot: Fix a hist trigger dependency for boot time tracing
      tracing/boot: Add per-event histogram action options
      tracing/boot: Support multiple handlers for per-event histogram
      tracing/boot: Support multiple histograms for each event
      tracing/boot: Show correct histogram error command
      Documentation: tracing: Add histogram syntax to boot-time tracing
      tools/bootconfig: Support per-group/all event enabling option
      tools/bootconfig: Add histogram syntax support to bconf2ftrace.sh
      tools/bootconfig: Use per-group/all enable option in ftrace2bconf script
      bootconfig/tracing/ktest: Update ktest example for boot-time tracing

Steven Rostedt (VMware) (5):
      tracing: Add linear buckets to histogram logic
      tracing/histogram: Update the documentation for the buckets modifier
      tracing: Have histogram types be constant when possible
      tracing: Allow execnames to be passed as args for synthetic events
      MAINTAINERS: Add an entry for os noise/latency

zhaoxiao (1):
      tracepoint: Fix kerneldoc comments

----
 Documentation/trace/boottime-trace.rst             |  85 +++++-
 Documentation/trace/histogram.rst                  |  92 ++++++-
 MAINTAINERS                                        |  14 +
 arch/Kconfig                                       |   3 +
 arch/arc/Kconfig                                   |   4 +-
 arch/arm/Kconfig                                   |   5 +-
 arch/arm64/Kconfig                                 |   4 +-
 arch/csky/Kconfig                                  |   4 +-
 arch/hexagon/Kconfig                               |   4 +-
 arch/microblaze/Kconfig                            |   1 +
 arch/microblaze/Kconfig.debug                      |   5 -
 arch/mips/Kconfig                                  |   1 +
 arch/mips/Kconfig.debug                            |   4 -
 arch/nds32/Kconfig                                 |   4 +-
 arch/nios2/Kconfig                                 |   3 -
 arch/openrisc/Kconfig                              |   4 +-
 arch/parisc/Kconfig                                |   1 +
 arch/parisc/Kconfig.debug                          |   3 -
 arch/powerpc/Kconfig                               |   5 +-
 arch/riscv/Kconfig                                 |   4 +-
 arch/s390/Kconfig                                  |   1 +
 arch/s390/Kconfig.debug                            |   3 -
 arch/sh/Kconfig                                    |   1 +
 arch/sh/Kconfig.debug                              |   3 -
 arch/sparc/Kconfig                                 |   1 +
 arch/sparc/Kconfig.debug                           |   4 -
 arch/um/Kconfig                                    |   5 +-
 arch/x86/Kconfig                                   |   1 +
 arch/x86/Kconfig.debug                             |   3 -
 arch/xtensa/Kconfig                                |   4 +-
 include/linux/tracepoint.h                         |   2 +-
 kernel/trace/Kconfig                               |   6 +-
 kernel/trace/trace.c                               |   1 +
 kernel/trace/trace_boot.c                          | 302 ++++++++++++++++++++-
 kernel/trace/trace_events_hist.c                   | 143 ++++++++--
 kernel/tracepoint.c                                |   4 +-
 tools/bootconfig/scripts/bconf2ftrace.sh           | 101 +++++++
 tools/bootconfig/scripts/ftrace2bconf.sh           |  24 +-
 tools/bootconfig/scripts/xbc.sh                    |   4 +-
 .../ktest/examples/bootconfigs/boottrace.bconf     |  20 +-
 .../ktest/examples/bootconfigs/verify-boottrace.sh |   2 +-
 41 files changed, 753 insertions(+), 132 deletions(-)

^ permalink raw reply	[flat|nested] 19+ messages in thread
* [for-next][PATCH 01/19] tracing/boot: Fix a hist trigger dependency for boot time tracing
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 02/19] tracing: Add linear buckets to histogram logic Steven Rostedt
                   ` (16 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Fixes a build error when CONFIG_HIST_TRIGGERS=n with boot-time
tracing. Since the trigger_process_regex() is defined only
when CONFIG_HIST_TRIGGERS=y, if it is disabled, the 'actions'
event option also must be disabled.

Link: https://lkml.kernel.org/r/162856123376.203126.582144262622247352.stgit@devnote2

Fixes: 81a59555ff15 ("tracing/boot: Add per-event settings")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_boot.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 94ef2d099e32..d713714cba67 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -205,12 +205,15 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 			pr_err("Failed to apply filter: %s\n", buf);
 	}
 
-	xbc_node_for_each_array_value(enode, "actions", anode, p) {
-		if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
-			pr_err("action string is too long: %s\n", p);
-		else if (trigger_process_regex(file, buf) < 0)
-			pr_err("Failed to apply an action: %s\n", buf);
-	}
+	if (IS_ENABLED(CONFIG_HIST_TRIGGERS)) {
+		xbc_node_for_each_array_value(enode, "actions", anode, p) {
+			if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
+				pr_err("action string is too long: %s\n", p);
+			else if (trigger_process_regex(file, buf) < 0)
+				pr_err("Failed to apply an action: %s\n", buf);
+		}
+	} else if (xbc_node_find_value(enode, "actions", NULL))
+		pr_err("Failed to apply event actions because CONFIG_HIST_TRIGGERS is not set.\n");
 
 	if (xbc_node_find_value(enode, "enable", NULL)) {
 		if (trace_event_enable_disable(file, 1, 0) < 0)
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 02/19] tracing: Add linear buckets to histogram logic
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 01/19] tracing/boot: Fix a hist trigger dependency for boot time tracing Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 03/19] tracing/histogram: Update the documentation for the buckets modifier Steven Rostedt
                   ` (15 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel
  Cc: Ingo Molnar, Andrew Morton, Namhyung Kim, Tom Zanussi,
	Masami Hiramatsu, Daniel Bristot de Oliveira

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

There's been several times I wished the histogram logic had a "grouping"
feature for the buckets. Currently, each bucket has a size of one. That
is, if you trace the amount of requested allocations, each allocation is
its own bucket, even if you are interested in what allocates 100 bytes or
less, 100 to 200, 200 to 300, etc.

Also, without grouping, it fills up the allocated histogram buckets
quickly. If you are tracking latency, and don't care if something is 200
microseconds off, or 201 microseconds off, but want to track them by say
10 microseconds each. This can not currently be done.

There is a log2 but that grouping get's too big too fast for a lot of
cases.

Introduce a "buckets=SIZE" command to each field where it will record in a
rounded number. For example:

 ># echo 'hist:keys=bytes_req.buckets=100:sort=bytes_req' > events/kmem/kmalloc/trigger
 ># cat events/kmem/kmalloc/hist
 # event histogram
 #
 # trigger info:
 hist:keys=bytes_req.buckets=100:vals=hitcount:sort=bytes_req.buckets=100:size=2048
 [active]
 #

 { bytes_req: ~ 0-99 } hitcount:       3149
 { bytes_req: ~ 100-199 } hitcount:       1468
 { bytes_req: ~ 200-299 } hitcount:         39
 { bytes_req: ~ 300-399 } hitcount:        306
 { bytes_req: ~ 400-499 } hitcount:        364
 { bytes_req: ~ 500-599 } hitcount:         32
 { bytes_req: ~ 600-699 } hitcount:         69
 { bytes_req: ~ 700-799 } hitcount:         37
 { bytes_req: ~ 1200-1299 } hitcount:         16
 { bytes_req: ~ 1400-1499 } hitcount:         30
 { bytes_req: ~ 2000-2099 } hitcount:          6
 { bytes_req: ~ 4000-4099 } hitcount:       2168
 { bytes_req: ~ 5000-5099 } hitcount:          6

 Totals:
     Hits: 7690
     Entries: 13
     Dropped: 0

Link: https://lkml.kernel.org/r/20210707213921.980359719@goodmis.org

Acked-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_events_hist.c | 65 ++++++++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a48aa2a2875b..8e87c4a429fd 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -121,6 +121,7 @@ struct hist_field {
 	unsigned int			size;
 	unsigned int			offset;
 	unsigned int                    is_signed;
+	unsigned long			buckets;
 	const char			*type;
 	struct hist_field		*operands[HIST_FIELD_OPERANDS_MAX];
 	struct hist_trigger_data	*hist_data;
@@ -219,6 +220,27 @@ static u64 hist_field_log2(struct hist_field *hist_field,
 	return (u64) ilog2(roundup_pow_of_two(val));
 }
 
+static u64 hist_field_bucket(struct hist_field *hist_field,
+			     struct tracing_map_elt *elt,
+			     struct trace_buffer *buffer,
+			     struct ring_buffer_event *rbe,
+			     void *event)
+{
+	struct hist_field *operand = hist_field->operands[0];
+	unsigned long buckets = hist_field->buckets;
+
+	u64 val = operand->fn(operand, elt, buffer, rbe, event);
+
+	if (WARN_ON_ONCE(!buckets))
+		return val;
+
+	if (val >= LONG_MAX)
+		val = div64_ul(val, buckets);
+	else
+		val = (u64)((unsigned long)val / buckets);
+	return val * buckets;
+}
+
 static u64 hist_field_plus(struct hist_field *hist_field,
 			   struct tracing_map_elt *elt,
 			   struct trace_buffer *buffer,
@@ -318,6 +340,7 @@ enum hist_field_flags {
 	HIST_FIELD_FL_VAR_REF		= 1 << 14,
 	HIST_FIELD_FL_CPU		= 1 << 15,
 	HIST_FIELD_FL_ALIAS		= 1 << 16,
+	HIST_FIELD_FL_BUCKET		= 1 << 17,
 };
 
 struct var_defs {
@@ -1109,7 +1132,8 @@ static const char *hist_field_name(struct hist_field *field,
 	if (field->field)
 		field_name = field->field->name;
 	else if (field->flags & HIST_FIELD_FL_LOG2 ||
-		 field->flags & HIST_FIELD_FL_ALIAS)
+		 field->flags & HIST_FIELD_FL_ALIAS ||
+		 field->flags & HIST_FIELD_FL_BUCKET)
 		field_name = hist_field_name(field->operands[0], ++level);
 	else if (field->flags & HIST_FIELD_FL_CPU)
 		field_name = "common_cpu";
@@ -1470,6 +1494,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
 		flags_str = "syscall";
 	else if (hist_field->flags & HIST_FIELD_FL_LOG2)
 		flags_str = "log2";
+	else if (hist_field->flags & HIST_FIELD_FL_BUCKET)
+		flags_str = "buckets";
 	else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
 		flags_str = "usecs";
 
@@ -1658,9 +1684,10 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 		goto out;
 	}
 
-	if (flags & HIST_FIELD_FL_LOG2) {
-		unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
-		hist_field->fn = hist_field_log2;
+	if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
+		unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
+		hist_field->fn = flags & HIST_FIELD_FL_LOG2 ? hist_field_log2 :
+			hist_field_bucket;
 		hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
 		hist_field->size = hist_field->operands[0]->size;
 		hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
@@ -1953,7 +1980,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
 
 static struct ftrace_event_field *
 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
-	    char *field_str, unsigned long *flags)
+	    char *field_str, unsigned long *flags, unsigned long *buckets)
 {
 	struct ftrace_event_field *field = NULL;
 	char *field_name, *modifier, *str;
@@ -1980,7 +2007,22 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
 			*flags |= HIST_FIELD_FL_LOG2;
 		else if (strcmp(modifier, "usecs") == 0)
 			*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
-		else {
+		else if (strncmp(modifier, "bucket", 6) == 0) {
+			int ret;
+
+			modifier += 6;
+
+			if (*modifier == 's')
+				modifier++;
+			if (*modifier != '=')
+				goto error;
+			modifier++;
+			ret = kstrtoul(modifier, 0, buckets);
+			if (ret || !(*buckets))
+				goto error;
+			*flags |= HIST_FIELD_FL_BUCKET;
+		} else {
+ error:
 			hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
 			field = ERR_PTR(-EINVAL);
 			goto out;
@@ -2049,6 +2091,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
 	char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
 	struct ftrace_event_field *field = NULL;
 	struct hist_field *hist_field = NULL;
+	unsigned long buckets = 0;
 	int ret = 0;
 
 	s = strchr(str, '.');
@@ -2086,7 +2129,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
 	} else
 		str = s;
 
-	field = parse_field(hist_data, file, str, flags);
+	field = parse_field(hist_data, file, str, flags, &buckets);
 	if (IS_ERR(field)) {
 		ret = PTR_ERR(field);
 		goto out;
@@ -2097,6 +2140,7 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
 		ret = -ENOMEM;
 		goto out;
 	}
+	hist_field->buckets = buckets;
 
 	return hist_field;
  out:
@@ -4698,6 +4742,11 @@ static void hist_trigger_print_key(struct seq_file *m,
 		} else if (key_field->flags & HIST_FIELD_FL_LOG2) {
 			seq_printf(m, "%s: ~ 2^%-2llu", field_name,
 				   *(u64 *)(key + key_field->offset));
+		} else if (key_field->flags & HIST_FIELD_FL_BUCKET) {
+			unsigned long buckets = key_field->buckets;
+			uval = *(u64 *)(key + key_field->offset);
+			seq_printf(m, "%s: ~ %llu-%llu", field_name,
+				   uval, uval + buckets -1);
 		} else if (key_field->flags & HIST_FIELD_FL_STRING) {
 			seq_printf(m, "%s: %-50s", field_name,
 				   (char *)(key + key_field->offset));
@@ -5137,6 +5186,8 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
 				seq_printf(m, ".%s", flags);
 		}
 	}
+	if (hist_field->buckets)
+		seq_printf(m, "=%ld", hist_field->buckets);
 }
 
 static int event_hist_trigger_print(struct seq_file *m,
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 03/19] tracing/histogram: Update the documentation for the buckets modifier
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 01/19] tracing/boot: Fix a hist trigger dependency for boot time tracing Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 02/19] tracing: Add linear buckets to histogram logic Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 04/19] tracing: Have histogram types be constant when possible Steven Rostedt
                   ` (14 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Namhyung Kim, Masami Hiramatsu

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Update both the tracefs README file as well as the histogram.rst to
include an explanation of what the buckets modifier is and how to use it.
Include an example with the wakeup_latency example for both log2 and the
buckets modifiers as there was no existing log2 example.

Link: https://lkml.kernel.org/r/20210707213922.167218794@goodmis.org

Acked-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Documentation/trace/histogram.rst | 92 +++++++++++++++++++++++++++++--
 kernel/trace/trace.c              |  1 +
 2 files changed, 87 insertions(+), 6 deletions(-)

diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
index f99be8062bc8..4e650671f245 100644
--- a/Documentation/trace/histogram.rst
+++ b/Documentation/trace/histogram.rst
@@ -77,6 +77,7 @@ Documentation written by Tom Zanussi
 	.syscall    display a syscall id as a system call name
 	.execname   display a common_pid as a program name
 	.log2       display log2 value rather than raw number
+	.buckets=size  display grouping of values rather than raw number
 	.usecs      display a common_timestamp in microseconds
 	=========== ==========================================
 
@@ -228,7 +229,7 @@ Extended error information
   that lists the total number of bytes requested for each function in
   the kernel that made one or more calls to kmalloc::
 
-    # echo 'hist:key=call_site:val=bytes_req' > \
+    # echo 'hist:key=call_site:val=bytes_req.buckets=32' > \
             /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
 
   This tells the tracing system to create a 'hist' trigger using the
@@ -1823,20 +1824,99 @@ and variables defined on other events (see Section 2.2.3 below on
 how that is done using hist trigger 'onmatch' action). Once that is
 done, the 'wakeup_latency' synthetic event instance is created.
 
-A histogram can now be defined for the new synthetic event::
-
-  # echo 'hist:keys=pid,prio,lat.log2:sort=pid,lat' >> \
-        /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/trigger
-
 The new event is created under the tracing/events/synthetic/ directory
 and looks and behaves just like any other event::
 
   # ls /sys/kernel/debug/tracing/events/synthetic/wakeup_latency
         enable  filter  format  hist  id  trigger
 
+A histogram can now be defined for the new synthetic event::
+
+  # echo 'hist:keys=pid,prio,lat.log2:sort=lat' >> \
+        /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/trigger
+
+The above shows the latency "lat" in a power of 2 grouping.
+
 Like any other event, once a histogram is enabled for the event, the
 output can be displayed by reading the event's 'hist' file.
 
+  # cat /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/hist
+
+  # event histogram
+  #
+  # trigger info: hist:keys=pid,prio,lat.log2:vals=hitcount:sort=lat.log2:size=2048 [active]
+  #
+
+  { pid:       2035, prio:          9, lat: ~ 2^2  } hitcount:         43
+  { pid:       2034, prio:          9, lat: ~ 2^2  } hitcount:         60
+  { pid:       2029, prio:          9, lat: ~ 2^2  } hitcount:        965
+  { pid:       2034, prio:        120, lat: ~ 2^2  } hitcount:          9
+  { pid:       2033, prio:        120, lat: ~ 2^2  } hitcount:          5
+  { pid:       2030, prio:          9, lat: ~ 2^2  } hitcount:        335
+  { pid:       2030, prio:        120, lat: ~ 2^2  } hitcount:         10
+  { pid:       2032, prio:        120, lat: ~ 2^2  } hitcount:          1
+  { pid:       2035, prio:        120, lat: ~ 2^2  } hitcount:          2
+  { pid:       2031, prio:          9, lat: ~ 2^2  } hitcount:        176
+  { pid:       2028, prio:        120, lat: ~ 2^2  } hitcount:         15
+  { pid:       2033, prio:          9, lat: ~ 2^2  } hitcount:         91
+  { pid:       2032, prio:          9, lat: ~ 2^2  } hitcount:        125
+  { pid:       2029, prio:        120, lat: ~ 2^2  } hitcount:          4
+  { pid:       2031, prio:        120, lat: ~ 2^2  } hitcount:          3
+  { pid:       2029, prio:        120, lat: ~ 2^3  } hitcount:          2
+  { pid:       2035, prio:          9, lat: ~ 2^3  } hitcount:         41
+  { pid:       2030, prio:        120, lat: ~ 2^3  } hitcount:          1
+  { pid:       2032, prio:          9, lat: ~ 2^3  } hitcount:         32
+  { pid:       2031, prio:          9, lat: ~ 2^3  } hitcount:         44
+  { pid:       2034, prio:          9, lat: ~ 2^3  } hitcount:         40
+  { pid:       2030, prio:          9, lat: ~ 2^3  } hitcount:         29
+  { pid:       2033, prio:          9, lat: ~ 2^3  } hitcount:         31
+  { pid:       2029, prio:          9, lat: ~ 2^3  } hitcount:         31
+  { pid:       2028, prio:        120, lat: ~ 2^3  } hitcount:         18
+  { pid:       2031, prio:        120, lat: ~ 2^3  } hitcount:          2
+  { pid:       2028, prio:        120, lat: ~ 2^4  } hitcount:          1
+  { pid:       2029, prio:          9, lat: ~ 2^4  } hitcount:          4
+  { pid:       2031, prio:        120, lat: ~ 2^7  } hitcount:          1
+  { pid:       2032, prio:        120, lat: ~ 2^7  } hitcount:          1
+
+  Totals:
+      Hits: 2122
+      Entries: 30
+      Dropped: 0
+
+
+The latency values can also be grouped linearly by a given size with
+the ".buckets" modifier and specify a size (in this case groups of 10).
+
+  # echo 'hist:keys=pid,prio,lat.buckets=10:sort=lat' >> \
+        /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/trigger
+
+  # event histogram
+  #
+  # trigger info: hist:keys=pid,prio,lat.buckets=10:vals=hitcount:sort=lat.buckets=10:size=2048 [active]
+  #
+
+  { pid:       2067, prio:          9, lat: ~ 0-9 } hitcount:        220
+  { pid:       2068, prio:          9, lat: ~ 0-9 } hitcount:        157
+  { pid:       2070, prio:          9, lat: ~ 0-9 } hitcount:        100
+  { pid:       2067, prio:        120, lat: ~ 0-9 } hitcount:          6
+  { pid:       2065, prio:        120, lat: ~ 0-9 } hitcount:          2
+  { pid:       2066, prio:        120, lat: ~ 0-9 } hitcount:          2
+  { pid:       2069, prio:          9, lat: ~ 0-9 } hitcount:        122
+  { pid:       2069, prio:        120, lat: ~ 0-9 } hitcount:          8
+  { pid:       2070, prio:        120, lat: ~ 0-9 } hitcount:          1
+  { pid:       2068, prio:        120, lat: ~ 0-9 } hitcount:          7
+  { pid:       2066, prio:          9, lat: ~ 0-9 } hitcount:        365
+  { pid:       2064, prio:        120, lat: ~ 0-9 } hitcount:         35
+  { pid:       2065, prio:          9, lat: ~ 0-9 } hitcount:        998
+  { pid:       2071, prio:          9, lat: ~ 0-9 } hitcount:         85
+  { pid:       2065, prio:          9, lat: ~ 10-19 } hitcount:          2
+  { pid:       2064, prio:        120, lat: ~ 10-19 } hitcount:          2
+
+  Totals:
+      Hits: 2112
+      Entries: 16
+      Dropped: 0
+
 2.2.3 Hist trigger 'handlers' and 'actions'
 -------------------------------------------
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a1adb29ef5c1..be0169594de5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5654,6 +5654,7 @@ static const char readme_msg[] =
 	"\t            .execname   display a common_pid as a program name\n"
 	"\t            .syscall    display a syscall id as a syscall name\n"
 	"\t            .log2       display log2 value rather than raw number\n"
+	"\t            .buckets=size  display values in groups of size rather than raw number\n"
 	"\t            .usecs      display a common_timestamp in microseconds\n\n"
 	"\t    The 'pause' parameter can be used to pause an existing hist\n"
 	"\t    trigger or to start a hist trigger but not log any events\n"
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 04/19] tracing: Have histogram types be constant when possible
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (2 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 03/19] tracing/histogram: Update the documentation for the buckets modifier Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 05/19] tracing: Allow execnames to be passed as args for synthetic events Steven Rostedt
                   ` (13 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Instead of kstrdup("const", GFP_KERNEL), have the hist_field type simply
assign the constant hist_field->type = "const"; And when the value passed
to it is a variable, use "kstrdup_const(var, GFP_KERNEL);" which will just
copy the value if the variable is already a constant. This saves on having
to allocate when not needed.

All frees of the hist_field->type will need to use kfree_const().

Link: https://lkml.kernel.org/r/20210722142837.280718447@goodmis.org

Suggested-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_events_hist.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8e87c4a429fd..bb466a82b938 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1616,7 +1616,9 @@ static void __destroy_hist_field(struct hist_field *hist_field)
 
 	kfree(hist_field->var.name);
 	kfree(hist_field->name);
-	kfree(hist_field->type);
+
+	/* Can likely be a const */
+	kfree_const(hist_field->type);
 
 	kfree(hist_field->system);
 	kfree(hist_field->event_name);
@@ -1673,9 +1675,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 	if (flags & HIST_FIELD_FL_HITCOUNT) {
 		hist_field->fn = hist_field_counter;
 		hist_field->size = sizeof(u64);
-		hist_field->type = kstrdup("u64", GFP_KERNEL);
-		if (!hist_field->type)
-			goto free;
+		hist_field->type = "u64";
 		goto out;
 	}
 
@@ -1690,7 +1690,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 			hist_field_bucket;
 		hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
 		hist_field->size = hist_field->operands[0]->size;
-		hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
+		hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
 		if (!hist_field->type)
 			goto free;
 		goto out;
@@ -1699,18 +1699,14 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 	if (flags & HIST_FIELD_FL_TIMESTAMP) {
 		hist_field->fn = hist_field_timestamp;
 		hist_field->size = sizeof(u64);
-		hist_field->type = kstrdup("u64", GFP_KERNEL);
-		if (!hist_field->type)
-			goto free;
+		hist_field->type = "u64";
 		goto out;
 	}
 
 	if (flags & HIST_FIELD_FL_CPU) {
 		hist_field->fn = hist_field_cpu;
 		hist_field->size = sizeof(int);
-		hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
-		if (!hist_field->type)
-			goto free;
+		hist_field->type = "unsigned int";
 		goto out;
 	}
 
@@ -1723,7 +1719,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 		flags |= HIST_FIELD_FL_STRING;
 
 		hist_field->size = MAX_FILTER_STR_VAL;
-		hist_field->type = kstrdup(field->type, GFP_KERNEL);
+		hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
 		if (!hist_field->type)
 			goto free;
 
@@ -1736,7 +1732,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
 	} else {
 		hist_field->size = field->size;
 		hist_field->is_signed = field->is_signed;
-		hist_field->type = kstrdup(field->type, GFP_KERNEL);
+		hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
 		if (!hist_field->type)
 			goto free;
 
@@ -1822,7 +1818,7 @@ static int init_var_ref(struct hist_field *ref_field,
 		}
 	}
 
-	ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
+	ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL);
 	if (!ref_field->type) {
 		err = -ENOMEM;
 		goto free;
@@ -2215,7 +2211,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
 	expr->operands[0] = operand1;
 	expr->operator = FIELD_OP_UNARY_MINUS;
 	expr->name = expr_str(expr, 0);
-	expr->type = kstrdup(operand1->type, GFP_KERNEL);
+	expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
 	if (!expr->type) {
 		ret = -ENOMEM;
 		goto free;
@@ -2355,7 +2351,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
 
 	expr->operator = field_op;
 	expr->name = expr_str(expr, 0);
-	expr->type = kstrdup(operand1->type, GFP_KERNEL);
+	expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
 	if (!expr->type) {
 		ret = -ENOMEM;
 		goto free;
@@ -2743,10 +2739,10 @@ static struct hist_field *create_var(struct hist_trigger_data *hist_data,
 	var->var.hist_data = var->hist_data = hist_data;
 	var->size = size;
 	var->var.name = kstrdup(name, GFP_KERNEL);
-	var->type = kstrdup(type, GFP_KERNEL);
+	var->type = kstrdup_const(type, GFP_KERNEL);
 	if (!var->var.name || !var->type) {
+		kfree_const(var->type);
 		kfree(var->var.name);
-		kfree(var->type);
 		kfree(var);
 		var = ERR_PTR(-ENOMEM);
 	}
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 05/19] tracing: Allow execnames to be passed as args for synthetic events
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (3 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 04/19] tracing: Have histogram types be constant when possible Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 06/19] tracing: Simplify the Kconfig dependency of FTRACE Steven Rostedt
                   ` (12 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Tom Zanussi, Masami Hiramatsu

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Allow common_pid.execname to be saved in a variable in one histogram to be
passed to another histogram that can pass it as a parameter to a synthetic
event.

 ># echo 'hist:keys=pid:__arg__1=common_timestamp.usecs:arg2=common_pid.execname' \
       > events/sched/sched_waking/trigger
 ># echo 'wakeup_lat s32 pid; u64 delta; char wake_comm[]' > synthetic_events
 ># echo 'hist:keys=next_pid:pid=next_pid,delta=common_timestamp.usecs-$__arg__1,exec=$arg2'\
':onmatch(sched.sched_waking).trace(wakeup_lat,$pid,$delta,$exec)' \
 > events/sched/sched_switch/trigger

The above is a wake up latency synthetic event setup that passes the execname
of the common_pid that woke the task to the scheduling of that task, which
triggers a synthetic event that passes the original execname as a
parameter to display it.

 ># echo 1 > events/synthetic/enable
 ># cat trace
    <idle>-0       [006] d..4   186.863801: wakeup_lat: pid=1306 delta=65 wake_comm=kworker/u16:3
    <idle>-0       [000] d..4   186.863858: wakeup_lat: pid=163 delta=27 wake_comm=<idle>
    <idle>-0       [001] d..4   186.863903: wakeup_lat: pid=1307 delta=36 wake_comm=kworker/u16:4
    <idle>-0       [000] d..4   186.863927: wakeup_lat: pid=163 delta=5 wake_comm=<idle>
    <idle>-0       [006] d..4   186.863957: wakeup_lat: pid=1306 delta=24 wake_comm=kworker/u16:3
      sshd-1306    [006] d..4   186.864051: wakeup_lat: pid=61 delta=62 wake_comm=<idle>
    <idle>-0       [000] d..4   186.965030: wakeup_lat: pid=609 delta=18 wake_comm=<idle>
    <idle>-0       [006] d..4   186.987582: wakeup_lat: pid=1306 delta=65 wake_comm=kworker/u16:3
    <idle>-0       [000] d..4   186.987639: wakeup_lat: pid=163 delta=27 wake_comm=<idle>

Link: https://lkml.kernel.org/r/20210722142837.458596338@goodmis.org

Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_events_hist.c | 46 +++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index bb466a82b938..9d91b1c06957 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1420,17 +1420,17 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
 	struct hist_trigger_data *hist_data = elt->map->private_data;
 	unsigned int size = TASK_COMM_LEN;
 	struct hist_elt_data *elt_data;
-	struct hist_field *key_field;
+	struct hist_field *hist_field;
 	unsigned int i, n_str;
 
 	elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
 	if (!elt_data)
 		return -ENOMEM;
 
-	for_each_hist_key_field(i, hist_data) {
-		key_field = hist_data->fields[i];
+	for_each_hist_field(i, hist_data) {
+		hist_field = hist_data->fields[i];
 
-		if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
+		if (hist_field->flags & HIST_FIELD_FL_EXECNAME) {
 			elt_data->comm = kzalloc(size, GFP_KERNEL);
 			if (!elt_data->comm) {
 				kfree(elt_data);
@@ -3771,6 +3771,41 @@ static int create_val_field(struct hist_trigger_data *hist_data,
 	return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
 }
 
+static const char *no_comm = "(no comm)";
+
+static u64 hist_field_execname(struct hist_field *hist_field,
+			       struct tracing_map_elt *elt,
+			       struct trace_buffer *buffer,
+			       struct ring_buffer_event *rbe,
+			       void *event)
+{
+	struct hist_elt_data *elt_data;
+
+	if (WARN_ON_ONCE(!elt))
+		return (u64)(unsigned long)no_comm;
+
+	elt_data = elt->private_data;
+
+	if (WARN_ON_ONCE(!elt_data->comm))
+		return (u64)(unsigned long)no_comm;
+
+	return (u64)(unsigned long)(elt_data->comm);
+}
+
+/* Convert a var that points to common_pid.execname to a string */
+static void update_var_execname(struct hist_field *hist_field)
+{
+	hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR |
+		HIST_FIELD_FL_EXECNAME;
+	hist_field->size = MAX_FILTER_STR_VAL;
+	hist_field->is_signed = 0;
+
+	kfree_const(hist_field->type);
+	hist_field->type = "char[]";
+
+	hist_field->fn = hist_field_execname;
+}
+
 static int create_var_field(struct hist_trigger_data *hist_data,
 			    unsigned int val_idx,
 			    struct trace_event_file *file,
@@ -3795,6 +3830,9 @@ static int create_var_field(struct hist_trigger_data *hist_data,
 
 	ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
 
+	if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME)
+		update_var_execname(hist_data->fields[val_idx]);
+
 	if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
 		hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
 
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 06/19] tracing: Simplify the Kconfig dependency of FTRACE
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (4 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 05/19] tracing: Allow execnames to be passed as args for synthetic events Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 08/19] tracing: Fix a typo in tracepoint.h Steven Rostedt
                   ` (11 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masahiro Yamada

From: Masahiro Yamada <masahiroy@kernel.org>

The entire FTRACE block is surrounded by 'if TRACING_SUPPORT' ...
'endif'.

Using 'depends on' is a simpler way to guard FTRACE.

Link: https://lkml.kernel.org/r/20210731052233.4703-1-masahiroy@kernel.org

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/Kconfig | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 3ee23f4d437f..420ff4bc67fd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -135,10 +135,9 @@ config TRACING_SUPPORT
 	depends on STACKTRACE_SUPPORT
 	default y
 
-if TRACING_SUPPORT
-
 menuconfig FTRACE
 	bool "Tracers"
+	depends on TRACING_SUPPORT
 	default y if DEBUG_KERNEL
 	help
 	  Enable the kernel tracing infrastructure.
@@ -1037,6 +1036,3 @@ config HIST_TRIGGERS_DEBUG
           If unsure, say N.
 
 endif # FTRACE
-
-endif # TRACING_SUPPORT
-
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 08/19] tracing: Fix a typo in tracepoint.h
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (5 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 06/19] tracing: Simplify the Kconfig dependency of FTRACE Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 09/19] tracing/boot: Add per-event histogram action options Steven Rostedt
                   ` (10 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Huang Shijie

From: Huang Shijie <shijie@os.amperecomputing.com>

It should be @prev_pid, not @prev_prid.

Link: https://lkml.kernel.org/r/20210802140234.5383-1-shijie@os.amperecomputing.com

Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 include/linux/tracepoint.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index ab58696d0ddd..28031b15f878 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -475,7 +475,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
  *	*
  *	* The declared 'local variable' is called '__entry'
  *	*
- *	* __field(pid_t, prev_prid) is equivalent to a standard declaration:
+ *	* __field(pid_t, prev_pid) is equivalent to a standard declaration:
  *	*
  *	*	pid_t	prev_pid;
  *	*
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 09/19] tracing/boot: Add per-event histogram action options
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (6 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 08/19] tracing: Fix a typo in tracepoint.h Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 10/19] tracing/boot: Support multiple handlers for per-event histogram Steven Rostedt
                   ` (9 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Add a hist-trigger action syntax support to boot-time tracing.
Currently, boot-time tracing supports per-event actions as option
strings. However, for the histogram action, it has a special syntax
and usually needs a long action definition.
To make it readable and fit to the bootconfig syntax, this introduces
a new options for histogram.

Here are the histogram action options for boot-time tracing.

ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist {
     keys = <KEY>[,...]
     values = <VAL>[,...]
     sort = <SORT-KEY>[,...]
     size = <ENTRIES>
     name = <HISTNAME>
     var { <VAR> = <EXPR> ... }
     pause|continue|clear
     onmax|onchange { var = <VAR>; <ACTION> [= <PARAM>] }
     onmatch { event = <EVENT>; <ACTION> [= <PARAM>] }
     filter = <FILTER>
}

Where <ACTION> is one of below;

     trace = <EVENT>, <ARG1>[, ...]
     save = <ARG1>[, ...]
     snapshot

Link: https://lkml.kernel.org/r/162856124106.203126.10501871028479029087.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_boot.c | 231 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 231 insertions(+)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index d713714cba67..3d0e51368f51 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -171,6 +171,231 @@ trace_boot_add_synth_event(struct xbc_node *node, const char *event)
 }
 #endif
 
+#ifdef CONFIG_HIST_TRIGGERS
+static int __init __printf(3, 4)
+append_printf(char **bufp, char *end, const char *fmt, ...)
+{
+	va_list args;
+	int ret;
+
+	if (*bufp == end)
+		return -ENOSPC;
+
+	va_start(args, fmt);
+	ret = vsnprintf(*bufp, end - *bufp, fmt, args);
+	if (ret < end - *bufp) {
+		*bufp += ret;
+	} else {
+		*bufp = end;
+		ret = -ERANGE;
+	}
+	va_end(args);
+
+	return ret;
+}
+
+static int __init
+append_str_nospace(char **bufp, char *end, const char *str)
+{
+	char *p = *bufp;
+	int len;
+
+	while (p < end - 1 && *str != '\0') {
+		if (!isspace(*str))
+			*(p++) = *str;
+		str++;
+	}
+	*p = '\0';
+	if (p == end - 1) {
+		*bufp = end;
+		return -ENOSPC;
+	}
+	len = p - *bufp;
+	*bufp = p;
+	return (int)len;
+}
+
+static int __init
+trace_boot_hist_add_array(struct xbc_node *hnode, char **bufp,
+			  char *end, const char *key)
+{
+	struct xbc_node *knode, *anode;
+	const char *p;
+	char sep;
+
+	knode = xbc_node_find_child(hnode, key);
+	if (knode) {
+		anode = xbc_node_get_child(knode);
+		if (!anode) {
+			pr_err("hist.%s requires value(s).\n", key);
+			return -EINVAL;
+		}
+
+		append_printf(bufp, end, ":%s", key);
+		sep = '=';
+		xbc_array_for_each_value(anode, p) {
+			append_printf(bufp, end, "%c%s", sep, p);
+			if (sep == '=')
+				sep = ',';
+		}
+	} else
+		return -ENOENT;
+
+	return 0;
+}
+
+static int __init
+trace_boot_hist_add_handler(struct xbc_node *hnode, char **bufp,
+			    char *end, const char *param)
+{
+	struct xbc_node *knode, *anode;
+	const char *p;
+	char sep;
+
+	/* Compose 'handler' parameter */
+	p = xbc_node_find_value(hnode, param, NULL);
+	if (!p) {
+		pr_err("hist.%s requires '%s' option.\n",
+		       xbc_node_get_data(hnode), param);
+		return -EINVAL;
+	}
+	append_printf(bufp, end, ":%s(%s)", xbc_node_get_data(hnode), p);
+
+	/* Compose 'action' parameter */
+	knode = xbc_node_find_child(hnode, "trace");
+	if (!knode)
+		knode = xbc_node_find_child(hnode, "save");
+
+	if (knode) {
+		anode = xbc_node_get_child(knode);
+		if (!anode || !xbc_node_is_value(anode)) {
+			pr_err("hist.%s.%s requires value(s).\n",
+			       xbc_node_get_data(hnode),
+			       xbc_node_get_data(knode));
+			return -EINVAL;
+		}
+
+		append_printf(bufp, end, ".%s", xbc_node_get_data(knode));
+		sep = '(';
+		xbc_array_for_each_value(anode, p) {
+			append_printf(bufp, end, "%c%s", sep, p);
+			if (sep == '(')
+				sep = ',';
+		}
+		append_printf(bufp, end, ")");
+	} else if (xbc_node_find_child(hnode, "snapshot")) {
+		append_printf(bufp, end, ".snapshot()");
+	} else {
+		pr_err("hist.%s requires an action.\n",
+		       xbc_node_get_data(hnode));
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Histogram boottime tracing syntax.
+ *
+ * ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist {
+ *	keys = <KEY>[,...]
+ *	values = <VAL>[,...]
+ *	sort = <SORT-KEY>[,...]
+ *	size = <ENTRIES>
+ *	name = <HISTNAME>
+ *	var { <VAR> = <EXPR> ... }
+ *	pause|continue|clear
+ *	onmax|onchange { var = <VAR>; <ACTION> [= <PARAM>] }
+ *	onmatch { event = <EVENT>; <ACTION> [= <PARAM>] }
+ *	filter = <FILTER>
+ * }
+ *
+ * Where <ACTION> are;
+ *
+ *	trace = <EVENT>, <ARG1>[, ...]
+ *	save = <ARG1>[, ...]
+ *	snapshot
+ */
+static int __init
+trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
+{
+	struct xbc_node *node, *knode;
+	char *end = buf + size;
+	const char *p;
+	int ret = 0;
+
+	append_printf(&buf, end, "hist");
+
+	ret = trace_boot_hist_add_array(hnode, &buf, end, "keys");
+	if (ret < 0) {
+		if (ret == -ENOENT)
+			pr_err("hist requires keys.\n");
+		return -EINVAL;
+	}
+
+	ret = trace_boot_hist_add_array(hnode, &buf, end, "values");
+	if (ret == -EINVAL)
+		return ret;
+	ret = trace_boot_hist_add_array(hnode, &buf, end, "sort");
+	if (ret == -EINVAL)
+		return ret;
+
+	p = xbc_node_find_value(hnode, "size", NULL);
+	if (p)
+		append_printf(&buf, end, ":size=%s", p);
+
+	p = xbc_node_find_value(hnode, "name", NULL);
+	if (p)
+		append_printf(&buf, end, ":name=%s", p);
+
+	node = xbc_node_find_child(hnode, "var");
+	if (node) {
+		xbc_node_for_each_key_value(node, knode, p) {
+			/* Expression must not include spaces. */
+			append_printf(&buf, end, ":%s=",
+				      xbc_node_get_data(knode));
+			append_str_nospace(&buf, end, p);
+		}
+	}
+
+	/* Histogram control attributes (mutual exclusive) */
+	if (xbc_node_find_child(hnode, "pause"))
+		append_printf(&buf, end, ":pause");
+	else if (xbc_node_find_child(hnode, "continue"))
+		append_printf(&buf, end, ":continue");
+	else if (xbc_node_find_child(hnode, "clear"))
+		append_printf(&buf, end, ":clear");
+
+	/* Histogram handler and actions */
+	node = xbc_node_find_child(hnode, "onmax");
+	if (node && trace_boot_hist_add_handler(node, &buf, end, "var") < 0)
+		return -EINVAL;
+	node = xbc_node_find_child(hnode, "onchange");
+	if (node && trace_boot_hist_add_handler(node, &buf, end, "var") < 0)
+		return -EINVAL;
+	node = xbc_node_find_child(hnode, "onmatch");
+	if (node && trace_boot_hist_add_handler(node, &buf, end, "event") < 0)
+		return -EINVAL;
+
+	p = xbc_node_find_value(hnode, "filter", NULL);
+	if (p)
+		append_printf(&buf, end, " if %s", p);
+
+	if (buf == end) {
+		pr_err("hist exceeds the max command length.\n");
+		return -E2BIG;
+	}
+
+	return 0;
+}
+#else
+static int __init
+trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 static void __init
 trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 			  struct xbc_node *enode)
@@ -212,6 +437,12 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 			else if (trigger_process_regex(file, buf) < 0)
 				pr_err("Failed to apply an action: %s\n", buf);
 		}
+		anode = xbc_node_find_child(enode, "hist");
+		if (anode &&
+		    trace_boot_compose_hist_cmd(anode, buf, ARRAY_SIZE(buf)) == 0) {
+			if (trigger_process_regex(file, buf) < 0)
+				pr_err("Failed to apply hist trigger: %s\n", buf);
+		}
 	} else if (xbc_node_find_value(enode, "actions", NULL))
 		pr_err("Failed to apply event actions because CONFIG_HIST_TRIGGERS is not set.\n");
 
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 10/19] tracing/boot: Support multiple handlers for per-event histogram
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (7 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 09/19] tracing/boot: Add per-event histogram action options Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 11/19] tracing/boot: Support multiple histograms for each event Steven Rostedt
                   ` (8 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Support multiple handlers for per-event histogram in boot-time tracing.
Since the histogram can register multiple same handler-actions with
different parameters, this expands the syntax to support such cases.

With this update, the 'onmax', 'onchange' and 'onmatch' handler subkeys
under per-event histogram option will take a number subkeys optionally
as below. (see [.N])

ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist {
     onmax|onchange[.N] { var = <VAR>; <ACTION> [= <PARAM>] }
     onmatch[.N] { event = <EVENT>; <ACTION> [= <PARAM>] }
}

The 'N' must be a digit (or digit started word).

Thus user can add several handler-actions to the histogram,
for example,

ftrace.event.SOMEGROUP.SOMEEVENT.hist {
   keys = SOME_ID; lat = common_timestamp.usecs-$ts0
   onmatch.1 {
	event = GROUP1.STARTEVENT1
	trace = latency_event, SOME_ID, $lat
   }
   onmatch.2 {
	event = GROUP2.STARTEVENT2
	trace = latency_event, SOME_ID, $lat
   }
}

Then, it can trace the elapsed time from GROUP1.STARTEVENT1 to
SOMEGROUP.SOMEEVENT, and from GROUP2.STARTEVENT2 to
SOMEGROUP.SOMEEVENT with SOME_ID key.

Link: https://lkml.kernel.org/r/162856124905.203126.14913731908137885922.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_boot.c | 43 +++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 3d0e51368f51..f024f27b3602 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -245,8 +245,9 @@ trace_boot_hist_add_array(struct xbc_node *hnode, char **bufp,
 }
 
 static int __init
-trace_boot_hist_add_handler(struct xbc_node *hnode, char **bufp,
-			    char *end, const char *param)
+trace_boot_hist_add_one_handler(struct xbc_node *hnode, char **bufp,
+				char *end, const char *handler,
+				const char *param)
 {
 	struct xbc_node *knode, *anode;
 	const char *p;
@@ -259,7 +260,7 @@ trace_boot_hist_add_handler(struct xbc_node *hnode, char **bufp,
 		       xbc_node_get_data(hnode), param);
 		return -EINVAL;
 	}
-	append_printf(bufp, end, ":%s(%s)", xbc_node_get_data(hnode), p);
+	append_printf(bufp, end, ":%s(%s)", handler, p);
 
 	/* Compose 'action' parameter */
 	knode = xbc_node_find_child(hnode, "trace");
@@ -294,6 +295,32 @@ trace_boot_hist_add_handler(struct xbc_node *hnode, char **bufp,
 	return 0;
 }
 
+static int __init
+trace_boot_hist_add_handlers(struct xbc_node *hnode, char **bufp,
+			     char *end, const char *param)
+{
+	struct xbc_node *node;
+	const char *p, *handler;
+	int ret;
+
+	handler = xbc_node_get_data(hnode);
+
+	xbc_node_for_each_subkey(hnode, node) {
+		p = xbc_node_get_data(node);
+		if (!isdigit(p[0]))
+			continue;
+		/* All digit started node should be instances. */
+		ret = trace_boot_hist_add_one_handler(node, bufp, end, handler, param);
+		if (ret < 0)
+			break;
+	}
+
+	if (xbc_node_find_child(hnode, param))
+		ret = trace_boot_hist_add_one_handler(hnode, bufp, end, handler, param);
+
+	return ret;
+}
+
 /*
  * Histogram boottime tracing syntax.
  *
@@ -305,8 +332,8 @@ trace_boot_hist_add_handler(struct xbc_node *hnode, char **bufp,
  *	name = <HISTNAME>
  *	var { <VAR> = <EXPR> ... }
  *	pause|continue|clear
- *	onmax|onchange { var = <VAR>; <ACTION> [= <PARAM>] }
- *	onmatch { event = <EVENT>; <ACTION> [= <PARAM>] }
+ *	onmax|onchange[.N] { var = <VAR>; <ACTION> [= <PARAM>] }
+ *	onmatch[.N] { event = <EVENT>; <ACTION> [= <PARAM>] }
  *	filter = <FILTER>
  * }
  *
@@ -368,13 +395,13 @@ trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
 
 	/* Histogram handler and actions */
 	node = xbc_node_find_child(hnode, "onmax");
-	if (node && trace_boot_hist_add_handler(node, &buf, end, "var") < 0)
+	if (node && trace_boot_hist_add_handlers(node, &buf, end, "var") < 0)
 		return -EINVAL;
 	node = xbc_node_find_child(hnode, "onchange");
-	if (node && trace_boot_hist_add_handler(node, &buf, end, "var") < 0)
+	if (node && trace_boot_hist_add_handlers(node, &buf, end, "var") < 0)
 		return -EINVAL;
 	node = xbc_node_find_child(hnode, "onmatch");
-	if (node && trace_boot_hist_add_handler(node, &buf, end, "event") < 0)
+	if (node && trace_boot_hist_add_handlers(node, &buf, end, "event") < 0)
 		return -EINVAL;
 
 	p = xbc_node_find_value(hnode, "filter", NULL);
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 11/19] tracing/boot: Support multiple histograms for each event
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (8 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 10/19] tracing/boot: Support multiple handlers for per-event histogram Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 12/19] tracing/boot: Show correct histogram error command Steven Rostedt
                   ` (7 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Add multiple histograms support for each event. This allows
user to set multiple histograms to an event.

ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist[.N] {
...
}

The 'N' is a digit started string and it can be omitted
for the default histogram.

For example, multiple hist triggers example in the
Documentation/trace/histogram.rst can be written as below;

ftrace.event.net.netif_receive_skb.hist {
	1 {
		keys = skbaddr.hex
		values = len
		filter = len < 0
	}
	2 {
		keys = skbaddr.hex
		values = len
		filter = len > 4096
	}
	3 {
		keys = skbaddr.hex
		values = len
		filter = len == 256
	}
	4 {
		keys = skbaddr.hex
		values = len
	}
	5 {
		keys = len
		values = common_preempt_count
	}
}

Link: https://lkml.kernel.org/r/162856125628.203126.15846930277378572120.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_boot.c | 41 ++++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index f024f27b3602..1a2b270e9cda 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -324,7 +324,7 @@ trace_boot_hist_add_handlers(struct xbc_node *hnode, char **bufp,
 /*
  * Histogram boottime tracing syntax.
  *
- * ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist {
+ * ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist[.N] {
  *	keys = <KEY>[,...]
  *	values = <VAL>[,...]
  *	sort = <SORT-KEY>[,...]
@@ -415,11 +415,37 @@ trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
 
 	return 0;
 }
+
+static void __init
+trace_boot_init_histograms(struct trace_event_file *file,
+			   struct xbc_node *hnode, char *buf, size_t size)
+{
+	struct xbc_node *node;
+	const char *p;
+
+	xbc_node_for_each_subkey(hnode, node) {
+		p = xbc_node_get_data(node);
+		if (!isdigit(p[0]))
+			continue;
+		/* All digit started node should be instances. */
+		if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {
+			if (trigger_process_regex(file, buf) < 0)
+				pr_err("Failed to apply hist trigger: %s\n", buf);
+		}
+	}
+
+	if (xbc_node_find_child(hnode, "keys")) {
+		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0)
+			if (trigger_process_regex(file, buf) < 0)
+				pr_err("Failed to apply hist trigger: %s\n", buf);
+	}
+}
 #else
-static int __init
-trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)
+static void __init
+trace_boot_init_histograms(struct trace_event_file *file,
+			   struct xbc_node *hnode, char *buf, size_t size)
 {
-	return -EOPNOTSUPP;
+	/* do nothing */
 }
 #endif
 
@@ -465,11 +491,8 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 				pr_err("Failed to apply an action: %s\n", buf);
 		}
 		anode = xbc_node_find_child(enode, "hist");
-		if (anode &&
-		    trace_boot_compose_hist_cmd(anode, buf, ARRAY_SIZE(buf)) == 0) {
-			if (trigger_process_regex(file, buf) < 0)
-				pr_err("Failed to apply hist trigger: %s\n", buf);
-		}
+		if (anode)
+			trace_boot_init_histograms(file, anode, buf, ARRAY_SIZE(buf));
 	} else if (xbc_node_find_value(enode, "actions", NULL))
 		pr_err("Failed to apply event actions because CONFIG_HIST_TRIGGERS is not set.\n");
 
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 12/19] tracing/boot: Show correct histogram error command
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (9 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 11/19] tracing/boot: Support multiple histograms for each event Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 13/19] Documentation: tracing: Add histogram syntax to boot-time tracing Steven Rostedt
                   ` (6 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Since trigger_process_regex() modifies given trigger actions
while parsing, the error message couldn't show what command
was passed to the trigger_process_regex() when it returns
an error.

To fix that, show the backed up trigger action command
instead of parsed buffer.

Link: https://lkml.kernel.org/r/162856126413.203126.9465564928450701424.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace_boot.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 1a2b270e9cda..1060b0446032 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -422,6 +422,7 @@ trace_boot_init_histograms(struct trace_event_file *file,
 {
 	struct xbc_node *node;
 	const char *p;
+	char *tmp;
 
 	xbc_node_for_each_subkey(hnode, node) {
 		p = xbc_node_get_data(node);
@@ -429,15 +430,20 @@ trace_boot_init_histograms(struct trace_event_file *file,
 			continue;
 		/* All digit started node should be instances. */
 		if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {
+			tmp = kstrdup(buf, GFP_KERNEL);
 			if (trigger_process_regex(file, buf) < 0)
-				pr_err("Failed to apply hist trigger: %s\n", buf);
+				pr_err("Failed to apply hist trigger: %s\n", tmp);
+			kfree(tmp);
 		}
 	}
 
 	if (xbc_node_find_child(hnode, "keys")) {
-		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0)
+		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0) {
+			tmp = kstrdup(buf, GFP_KERNEL);
 			if (trigger_process_regex(file, buf) < 0)
-				pr_err("Failed to apply hist trigger: %s\n", buf);
+				pr_err("Failed to apply hist trigger: %s\n", tmp);
+			kfree(tmp);
+		}
 	}
 }
 #else
@@ -488,7 +494,7 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
 			if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
 				pr_err("action string is too long: %s\n", p);
 			else if (trigger_process_regex(file, buf) < 0)
-				pr_err("Failed to apply an action: %s\n", buf);
+				pr_err("Failed to apply an action: %s\n", p);
 		}
 		anode = xbc_node_find_child(enode, "hist");
 		if (anode)
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 13/19] Documentation: tracing: Add histogram syntax to boot-time tracing
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (10 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 12/19] tracing/boot: Show correct histogram error command Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 14/19] tools/bootconfig: Support per-group/all event enabling option Steven Rostedt
                   ` (5 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Add the documentation about histogram syntax in boot-time tracing.
This will allow user to write the histogram setting in a structured
parameters.

Link: https://lkml.kernel.org/r/162856127129.203126.15551542847575916525.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Documentation/trace/boottime-trace.rst | 85 ++++++++++++++++++++++++--
 1 file changed, 80 insertions(+), 5 deletions(-)

diff --git a/Documentation/trace/boottime-trace.rst b/Documentation/trace/boottime-trace.rst
index 8053898cfeb4..6dcfbc64014d 100644
--- a/Documentation/trace/boottime-trace.rst
+++ b/Documentation/trace/boottime-trace.rst
@@ -125,6 +125,71 @@ Note that kprobe and synthetic event definitions can be written under
 instance node, but those are also visible from other instances. So please
 take care for event name conflict.
 
+Ftrace Histogram Options
+------------------------
+
+Since it is too long to write a histogram action as a string for per-event
+action option, there are tree-style options under per-event 'hist' subkey
+for the histogram actions. For the detail of the each parameter,
+please read the event histogram document [3]_.
+
+.. [3] See :ref:`Documentation/trace/histogram.rst <histogram>`
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]keys = KEY1[, KEY2[...]]
+  Set histogram key parameters. (Mandatory)
+  The 'N' is a digit string for the multiple histogram. You can omit it
+  if there is one histogram on the event.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]values = VAL1[, VAL2[...]]
+  Set histogram value parameters.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]sort = SORT1[, SORT2[...]]
+  Set histogram sort parameter options.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]size = NR_ENTRIES
+  Set histogram size (number of entries).
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]name = NAME
+  Set histogram name.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]var.VARIABLE = EXPR
+  Define a new VARIABLE by EXPR expression.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]<pause|continue|clear>
+  Set histogram control parameter. You can set one of them.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]onmatch.[M.]event = GROUP.EVENT
+  Set histogram 'onmatch' handler matching event parameter.
+  The 'M' is a digit string for the multiple 'onmatch' handler. You can omit it
+  if there is one 'onmatch' handler on this histogram.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]onmatch.[M.]trace = EVENT[, ARG1[...]]
+  Set histogram 'trace' action for 'onmatch'.
+  EVENT must be a synthetic event name, and ARG1... are parameters
+  for that event. Mandatory if 'onmatch.event' option is set.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]onmax.[M.]var = VAR
+  Set histogram 'onmax' handler variable parameter.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]onchange.[M.]var = VAR
+  Set histogram 'onchange' handler variable parameter.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]<onmax|onchange>.[M.]save = ARG1[, ARG2[...]]
+  Set histogram 'save' action parameters for 'onmax' or 'onchange' handler.
+  This option or below 'snapshot' option is mandatory if 'onmax.var' or
+  'onchange.var' option is set.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.[N.]<onmax|onchange>.[M.]snapshot
+  Set histogram 'snapshot' action for 'onmax' or 'onchange' handler.
+  This option or above 'save' option is mandatory if 'onmax.var' or
+  'onchange.var' option is set.
+
+ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist.filter = FILTER_EXPR
+  Set histogram filter expression. You don't need 'if' in the FILTER_EXPR.
+
+Note that this 'hist' option can conflict with the per-event 'actions'
+option if the 'actions' option has a histogram action.
+
 
 When to Start
 =============
@@ -159,13 +224,23 @@ below::
         }
         synthetic.initcall_latency {
                 fields = "unsigned long func", "u64 lat"
-                actions = "hist:keys=func.sym,lat:vals=lat:sort=lat"
+                hist {
+                        keys = func.sym, lat
+                        values = lat
+                        sort = lat
+                }
         }
-        initcall.initcall_start {
-                actions = "hist:keys=func:ts0=common_timestamp.usecs"
+        initcall.initcall_start.hist {
+                keys = func
+                var.ts0 = common_timestamp.usecs
         }
-        initcall.initcall_finish {
-                actions = "hist:keys=func:lat=common_timestamp.usecs-$ts0:onmatch(initcall.initcall_start).initcall_latency(func,$lat)"
+        initcall.initcall_finish.hist {
+                keys = func
+                var.lat = common_timestamp.usecs - $ts0
+                onmatch {
+                        event = initcall.initcall_start
+                        trace = initcall_latency, func, $lat
+                }
         }
   }
 
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 14/19] tools/bootconfig: Support per-group/all event enabling option
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (11 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 13/19] Documentation: tracing: Add histogram syntax to boot-time tracing Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 15/19] tools/bootconfig: Add histogram syntax support to bconf2ftrace.sh Steven Rostedt
                   ` (4 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Add group or all event enabling syntax support to bconf2ftrace.sh.
User can pass a bootconfig file which includes

ftrace[.instance.INSTANCE].event.enable

    and

ftrace[.instance.INSTANCE].event.GROUP.enable

correctly.

Link: https://lkml.kernel.org/r/162856127850.203126.16694505101982548237.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/bootconfig/scripts/bconf2ftrace.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/bootconfig/scripts/bconf2ftrace.sh b/tools/bootconfig/scripts/bconf2ftrace.sh
index feb30c2c7881..651049c782c0 100755
--- a/tools/bootconfig/scripts/bconf2ftrace.sh
+++ b/tools/bootconfig/scripts/bconf2ftrace.sh
@@ -101,6 +101,12 @@ setup_event() { # prefix group event [instance]
 	else
 		eventdir="$TRACEFS/events/$2/$3"
 	fi
+	# group enable
+	if [ "$3" = "enable" ]; then
+		run_cmd "echo 1 > ${eventdir}"
+		return
+	fi
+
 	case $2 in
 	kprobes)
 		xbc_get_val ${branch}.probes | while read line; do
@@ -127,6 +133,13 @@ setup_events() { # prefix("ftrace" or "ftrace.instance.INSTANCE") [instance]
 			setup_event $prefix ${grpev%.*} ${grpev#*.} $2
 		done
 	fi
+	if xbc_has_branch ${1}.event.enable; then
+		if [ "$2" ]; then
+			run_cmd "echo 1 > $TRACEFS/instances/$2/events/enable"
+		else
+			run_cmd "echo 1 > $TRACEFS/events/enable"
+		fi
+	fi
 }
 
 size2kb() { # size[KB|MB]
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 15/19] tools/bootconfig: Add histogram syntax support to bconf2ftrace.sh
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (12 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 14/19] tools/bootconfig: Support per-group/all event enabling option Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 16/19] tools/bootconfig: Use per-group/all enable option in ftrace2bconf script Steven Rostedt
                   ` (3 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Add histogram syntax support to bconf2ftrace.sh script.

Link: https://lkml.kernel.org/r/162856128672.203126.8240335908303312607.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/bootconfig/scripts/bconf2ftrace.sh | 88 ++++++++++++++++++++++++
 tools/bootconfig/scripts/xbc.sh          |  4 +-
 2 files changed, 90 insertions(+), 2 deletions(-)

diff --git a/tools/bootconfig/scripts/bconf2ftrace.sh b/tools/bootconfig/scripts/bconf2ftrace.sh
index 651049c782c0..850c2073433e 100755
--- a/tools/bootconfig/scripts/bconf2ftrace.sh
+++ b/tools/bootconfig/scripts/bconf2ftrace.sh
@@ -94,6 +94,92 @@ compose_synth() { # event_name branch
 	xbc_get_val $2 | while read field; do echo -n "$field; "; done
 }
 
+print_hist_array() { # prefix key
+	__sep="="
+	if xbc_has_key ${1}.${2}; then
+		echo -n ":$2"
+		xbc_get_val ${1}.${2} | while read field; do
+			echo -n "$__sep$field"; __sep=","
+		done
+	fi
+}
+
+print_hist_action_array() { # prefix key
+	__sep="("
+	echo -n ".$2"
+	xbc_get_val ${1}.${2} | while read field; do
+		echo -n "$__sep$field"; __sep=","
+	done
+	echo -n ")"
+}
+
+print_hist_one_action() { # prefix handler param
+	echo -n ":${2}("`xbc_get_val ${1}.${3}`")"
+	if xbc_has_key "${1}.trace"; then
+		print_hist_action_array ${1} "trace"
+	elif xbc_has_key "${1}.save"; then
+		print_hist_action_array ${1} "save"
+	elif xbc_has_key "${1}.snapshot"; then
+		echo -n ".snapshot()"
+	fi
+}
+
+print_hist_actions() { # prefix handler param
+	for __hdr in `xbc_subkeys ${1}.${2} 1 ".[0-9]"`; do
+		print_hist_one_action ${1}.${2}.$__hdr ${2} ${3}
+	done
+	if xbc_has_key ${1}.${2}.${3} ; then
+		print_hist_one_action ${1}.${2} ${2} ${3}
+	fi
+}
+
+print_hist_var() { # prefix varname
+	echo -n ":${2}="`xbc_get_val ${1}.var.${2} | tr -d [:space:]`
+}
+
+print_one_histogram() { # prefix
+	echo -n "hist"
+	print_hist_array $1 "keys"
+	print_hist_array $1 "values"
+	print_hist_array $1 "sort"
+	if xbc_has_key "${1}.size"; then
+		echo -n ":size="`xbc_get_val ${1}.size`
+	fi
+	if xbc_has_key "${1}.name"; then
+		echo -n ":name="`xbc_get_val ${1}.name`
+	fi
+	for __var in `xbc_subkeys "${1}.var" 1`; do
+		print_hist_var ${1} ${__var}
+	done
+	if xbc_has_key "${1}.pause"; then
+		echo -n ":pause"
+	elif xbc_has_key "${1}.continue"; then
+		echo -n ":continue"
+	elif xbc_has_key "${1}.clear"; then
+		echo -n ":clear"
+	fi
+	print_hist_actions ${1} "onmax" "var"
+	print_hist_actions ${1} "onchange" "var"
+	print_hist_actions ${1} "onmatch" "event"
+
+	if xbc_has_key "${1}.filter"; then
+		echo -n " if "`xbc_get_val ${1}.filter`
+	fi
+}
+
+setup_one_histogram() { # prefix trigger-file
+	run_cmd "echo '`print_one_histogram ${1}`' >> ${2}"
+}
+
+setup_histograms() { # prefix trigger-file
+	for __hist in `xbc_subkeys ${1} 1 ".[0-9]"`; do
+		setup_one_histogram ${1}.$__hist ${2}
+	done
+	if xbc_has_key ${1}.keys; then
+		setup_one_histogram ${1} ${2}
+	fi
+}
+
 setup_event() { # prefix group event [instance]
 	branch=$1.$2.$3
 	if [ "$4" ]; then
@@ -121,6 +207,8 @@ setup_event() { # prefix group event [instance]
 	set_value_of ${branch}.filter ${eventdir}/filter
 	set_array_of ${branch}.actions ${eventdir}/trigger
 
+	setup_histograms ${branch}.hist ${eventdir}/trigger
+
 	if xbc_has_key ${branch}.enable; then
 		run_cmd "echo 1 > ${eventdir}/enable"
 	fi
diff --git a/tools/bootconfig/scripts/xbc.sh b/tools/bootconfig/scripts/xbc.sh
index b8c84e654556..1f0ebf50dd2d 100644
--- a/tools/bootconfig/scripts/xbc.sh
+++ b/tools/bootconfig/scripts/xbc.sh
@@ -49,8 +49,8 @@ xbc_has_branch() { # prefix-key
 	grep -q "^$1" $XBC_TMPFILE
 }
 
-xbc_subkeys() { # prefix-key depth
+xbc_subkeys() { # prefix-key depth [subkey-pattern]
 	__keys=`echo $1 | sed "s/\./ /g"`
 	__s=`nr_args $__keys`
-	grep "^$1" $XBC_TMPFILE | cut -d= -f1| cut -d. -f$((__s + 1))-$((__s + $2)) | uniq
+	grep "^$1$3" $XBC_TMPFILE | cut -d= -f1| cut -d. -f$((__s + 1))-$((__s + $2)) | uniq
 }
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 16/19] tools/bootconfig: Use per-group/all enable option in ftrace2bconf script
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (13 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 15/19] tools/bootconfig: Add histogram syntax support to bconf2ftrace.sh Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 17/19] bootconfig/tracing/ktest: Update ktest example for boot-time tracing Steven Rostedt
                   ` (2 subsequent siblings)
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Use per-group/all enable option instead of ftrace.events option.
This will make the bootconfig file more readable.

Link: https://lkml.kernel.org/r/162856129436.203126.12462564671412940618.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/bootconfig/scripts/ftrace2bconf.sh | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/tools/bootconfig/scripts/ftrace2bconf.sh b/tools/bootconfig/scripts/ftrace2bconf.sh
index a0c3bcc6da4f..fbaf07dc91bf 100755
--- a/tools/bootconfig/scripts/ftrace2bconf.sh
+++ b/tools/bootconfig/scripts/ftrace2bconf.sh
@@ -92,6 +92,10 @@ referred_vars() {
 	grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
 }
 
+event_is_enabled() { # enable-file
+	test -f $1 & grep -q "1" $1
+}
+
 per_event_options() { # event-dir
 	evdir=$1
 	# Check the special event which has no filter and no trigger
@@ -113,7 +117,9 @@ per_event_options() { # event-dir
 		emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
 	done
 
-	# enable is not checked; this is done by set_event in the instance.
+	if [ $GROUP_ENABLED -eq 0 ] && event_is_enabled $evdir/enable; then
+		emit_kv $PREFIX.event.$group.$event.enable
+	fi
 	val=`cat $evdir/filter`
 	if [ "$val" != "none" ]; then
 		emit_kv $PREFIX.event.$group.$event.filter = "$val"
@@ -137,8 +143,19 @@ event_options() {
 		kprobe_event_options
 		synth_event_options
 	fi
+	ALL_ENABLED=0
+	if event_is_enabled $INSTANCE/events/enable; then
+		emit_kv $PREFIX.event.enable
+		ALL_ENABLED=1
+	fi
 	for group in `ls $INSTANCE/events/` ; do
 		[ ! -d $INSTANCE/events/$group ] && continue
+		GROUP_ENABLED=$ALL_ENABLED
+		if [ $ALL_ENABLED -eq 0 ] && \
+		   event_is_enabled $INSTANCE/events/$group/enable ;then
+			emit_kv $PREFIX.event.$group.enable
+			GROUP_ENABLED=1
+		fi
 		for event in `ls $INSTANCE/events/$group/` ;do
 			[ ! -d $INSTANCE/events/$group/$event ] && continue
 			per_event_options $INSTANCE/events/$group/$event
@@ -226,11 +243,6 @@ instance_options() { # [instance-name]
 		emit_kv $PREFIX.tracing_on = $val
 	fi
 
-	val=
-	for i in `cat $INSTANCE/set_event`; do
-		val="$val, $i"
-	done
-	[ "$val" ] && emit_kv $PREFIX.events = "${val#,}"
 	val=`cat $INSTANCE/current_tracer`
 	[ $val != nop ] && emit_kv $PREFIX.tracer = $val
 	if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 17/19] bootconfig/tracing/ktest: Update ktest example for boot-time tracing
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (14 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 16/19] tools/bootconfig: Use per-group/all enable option in ftrace2bconf script Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 18/19] tracepoint: Fix kerneldoc comments Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 19/19] MAINTAINERS: Add an entry for os noise/latency Steven Rostedt
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu

From: Masami Hiramatsu <mhiramat@kernel.org>

Update ktest example for the boot-time tracing with histogram
options. Note that since the histogram option uses "trace()" action
instead of "EVENT()", this updates the matching pattern too.

Link: https://lkml.kernel.org/r/162856130208.203126.4458319094852152589.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 .../examples/bootconfigs/boottrace.bconf      | 20 ++++++++++++++-----
 .../examples/bootconfigs/verify-boottrace.sh  |  2 +-
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/tools/testing/ktest/examples/bootconfigs/boottrace.bconf b/tools/testing/ktest/examples/bootconfigs/boottrace.bconf
index 9db64ec589d5..7aa706cccb3b 100644
--- a/tools/testing/ktest/examples/bootconfigs/boottrace.bconf
+++ b/tools/testing/ktest/examples/bootconfigs/boottrace.bconf
@@ -10,13 +10,23 @@ ftrace.event {
 	}
 	synthetic.initcall_latency {
 		fields = "unsigned long func", "u64 lat"
-		actions = "hist:keys=func.sym,lat:vals=lat:sort=lat"
+		hist {
+			keys = func.sym,lat
+			values = lat
+			sort = lat
+		}
 	}
-	initcall.initcall_start {
-		actions = "hist:keys=func:ts0=common_timestamp.usecs"
+	initcall.initcall_start.hist {
+		keys = func;
+		var.ts0 = common_timestamp.usecs
 	}
-	initcall.initcall_finish {
-		actions = "hist:keys=func:lat=common_timestamp.usecs-$ts0:onmatch(initcall.initcall_start).initcall_latency(func,$lat)"
+	initcall.initcall_finish.hist {
+		keys = func
+		var.lat = common_timestamp.usecs - $ts0
+		onmatch {
+			event = initcall.initcall_start
+			trace = initcall_latency, func, $lat
+		}
 	}
 }
 
diff --git a/tools/testing/ktest/examples/bootconfigs/verify-boottrace.sh b/tools/testing/ktest/examples/bootconfigs/verify-boottrace.sh
index f271940ce7fb..233e95cfcf20 100755
--- a/tools/testing/ktest/examples/bootconfigs/verify-boottrace.sh
+++ b/tools/testing/ktest/examples/bootconfigs/verify-boottrace.sh
@@ -58,7 +58,7 @@ compare_file_partial "events/synthetic/initcall_latency/enable" "0"
 compare_file_partial "events/initcall/initcall_start/trigger" "hist:keys=func:vals=hitcount:ts0=common_timestamp.usecs"
 compare_file_partial "events/initcall/initcall_start/enable" "1"
 
-compare_file_partial "events/initcall/initcall_finish/trigger" 'hist:keys=func:vals=hitcount:lat=common_timestamp.usecs-\$ts0:sort=hitcount:size=2048:clock=global:onmatch(initcall.initcall_start).initcall_latency(func,\$lat)'
+compare_file_partial "events/initcall/initcall_finish/trigger" 'hist:keys=func:vals=hitcount:lat=common_timestamp.usecs-\$ts0:sort=hitcount:size=2048:clock=global:onmatch(initcall.initcall_start).trace(initcall_latency,func,\$lat)'
 compare_file_partial "events/initcall/initcall_finish/enable" "1"
 
 compare_file "instances/foo/current_tracer" "function"
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 18/19] tracepoint: Fix kerneldoc comments
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (15 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 17/19] bootconfig/tracing/ktest: Update ktest example for boot-time tracing Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  2021-08-17 19:42 ` [for-next][PATCH 19/19] MAINTAINERS: Add an entry for os noise/latency Steven Rostedt
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Mathieu Desnoyers, zhaoxiao

From: zhaoxiao <zhaoxiao@uniontech.com>

Fix function name in tracepoint.c kernel-doc comment
to remove a warning found by clang_w1.

kernel/tracepoint.c:589: warning: expecting prototype for register_tracepoint_notifier(). Prototype was for register_tracepoint_module_notifier() instead
kernel/tracepoint.c:613: warning: expecting prototype for unregister_tracepoint_notifier(). Prototype was for unregister_tracepoint_module_notifier() instead

Link: https://lkml.kernel.org/r/20210816052430.16539-1-zhaoxiao@uniontech.com

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: zhaoxiao <zhaoxiao@uniontech.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/tracepoint.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index efd14c79fab4..64ea283f2f86 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -577,7 +577,7 @@ bool trace_module_has_bad_taint(struct module *mod)
 static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list);
 
 /**
- * register_tracepoint_notifier - register tracepoint coming/going notifier
+ * register_tracepoint_module_notifier - register tracepoint coming/going notifier
  * @nb: notifier block
  *
  * Notifiers registered with this function are called on module
@@ -603,7 +603,7 @@ int register_tracepoint_module_notifier(struct notifier_block *nb)
 EXPORT_SYMBOL_GPL(register_tracepoint_module_notifier);
 
 /**
- * unregister_tracepoint_notifier - unregister tracepoint coming/going notifier
+ * unregister_tracepoint_module_notifier - unregister tracepoint coming/going notifier
  * @nb: notifier block
  *
  * The notifier block callback should expect a "struct tp_module" data
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [for-next][PATCH 19/19] MAINTAINERS: Add an entry for os noise/latency
  2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
                   ` (16 preceding siblings ...)
  2021-08-17 19:42 ` [for-next][PATCH 18/19] tracepoint: Fix kerneldoc comments Steven Rostedt
@ 2021-08-17 19:42 ` Steven Rostedt
  17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2021-08-17 19:42 UTC (permalink / raw)
  To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The "latency" tracers have some different requirements than normal
tracing, and also includes Daniel as a maintainer. Add a section in the
MAINTAINERS file to help direct patches and bug reports to these tracers
to the right people.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 MAINTAINERS | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 6c8be735cc91..4268644cf86a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18798,6 +18798,20 @@ F:	arch/x86/mm/testmmiotrace.c
 F:	include/linux/mmiotrace.h
 F:	kernel/trace/trace_mmiotrace.c
 
+TRACING OS NOISE / LATENCY TRACERS
+M:	Steven Rostedt <rostedt@goodmis.org>
+M:	Daniel Bristot de Oliveira <bristot@kernel.org>
+S:	Maintained
+F:	kernel/trace/trace_osnoise.c
+F:	include/trace/events/osnoise.h
+F:	kernel/trace/trace_hwlat.c
+F:	kernel/trace/trace_irqsoff.c
+F:	kernel/trace/trace_sched_wakeup.c
+F:	Documentation/trace/osnoise-tracer.rst
+F:	Documentation/trace/timerlat-tracer.rst
+F:	Documentation/trace/hwlat_detector.rst
+F:	arch/*/kernel/trace.c
+
 TRIVIAL PATCHES
 M:	Jiri Kosina <trivial@kernel.org>
 S:	Maintained
-- 
2.30.2

^ permalink raw reply related	[flat|nested] 19+ messages in thread
end of thread, other threads:[~2021-08-17 19:45 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-17 19:42 [for-next][PATCH 00/19] tracing: Updates for 5.15 Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 01/19] tracing/boot: Fix a hist trigger dependency for boot time tracing Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 02/19] tracing: Add linear buckets to histogram logic Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 03/19] tracing/histogram: Update the documentation for the buckets modifier Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 04/19] tracing: Have histogram types be constant when possible Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 05/19] tracing: Allow execnames to be passed as args for synthetic events Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 06/19] tracing: Simplify the Kconfig dependency of FTRACE Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 08/19] tracing: Fix a typo in tracepoint.h Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 09/19] tracing/boot: Add per-event histogram action options Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 10/19] tracing/boot: Support multiple handlers for per-event histogram Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 11/19] tracing/boot: Support multiple histograms for each event Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 12/19] tracing/boot: Show correct histogram error command Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 13/19] Documentation: tracing: Add histogram syntax to boot-time tracing Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 14/19] tools/bootconfig: Support per-group/all event enabling option Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 15/19] tools/bootconfig: Add histogram syntax support to bconf2ftrace.sh Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 16/19] tools/bootconfig: Use per-group/all enable option in ftrace2bconf script Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 17/19] bootconfig/tracing/ktest: Update ktest example for boot-time tracing Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 18/19] tracepoint: Fix kerneldoc comments Steven Rostedt
2021-08-17 19:42 ` [for-next][PATCH 19/19] MAINTAINERS: Add an entry for os noise/latency Steven Rostedt

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