linux-kernel - [PATCH v2 4/9] tracing/boot: Support multiple histograms for each event

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Date:   Fri,  6 Aug 2021 01:25:51 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH v2 4/9] tracing/boot: Support multiple histograms for each event

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
	}
}

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 0 files changed

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 0db0775d37af..1f4b80f6fcb6 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -303,7 +303,7 @@ 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>[,...]
@@ -392,6 +392,32 @@ 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);
+	}
+
+}
 #endif
 
 static void __init
@@ -435,11 +461,8 @@ 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));
 #endif
 
 	if (xbc_node_find_value(enode, "enable", NULL)) {