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From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 17 Jul 2011 21:56:42 +0200
Subject: trace: Add migrate-disabled counter to tracing output
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.15-rt12.tar.xz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/trace_events.h | 2 ++
kernel/trace/trace.c | 9 ++++++---
kernel/trace/trace_events.c | 2 ++
kernel/trace/trace_output.c | 5 +++++
4 files changed, 15 insertions(+), 3 deletions(-)
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -62,6 +62,8 @@ struct trace_entry {
unsigned char flags;
unsigned char preempt_count;
int pid;
+ unsigned short migrate_disable;
+ unsigned short padding;
};
#define TRACE_EVENT_TYPE_MAX \
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2146,6 +2146,8 @@ tracing_generic_entry_update(struct trac
((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) |
(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
(test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
+
+ entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0;
}
EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
@@ -3349,9 +3351,10 @@ static void print_lat_help_header(struct
"# | / _----=> need-resched \n"
"# || / _---=> hardirq/softirq \n"
"# ||| / _--=> preempt-depth \n"
- "# |||| / delay \n"
- "# cmd pid ||||| time | caller \n"
- "# \\ / ||||| \\ | / \n");
+ "# |||| / _--=> migrate-disable\n"
+ "# ||||| / delay \n"
+ "# cmd pid |||||| time | caller \n"
+ "# \\ / ||||| \\ | / \n");
}
static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -188,6 +188,8 @@ static int trace_define_common_fields(vo
__common_field(unsigned char, flags);
__common_field(unsigned char, preempt_count);
__common_field(int, pid);
+ __common_field(unsigned short, migrate_disable);
+ __common_field(unsigned short, padding);
return ret;
}
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -494,6 +494,11 @@ int trace_print_lat_fmt(struct trace_seq
else
trace_seq_putc(s, '.');
+ if (entry->migrate_disable)
+ trace_seq_printf(s, "%x", entry->migrate_disable);
+ else
+ trace_seq_putc(s, '.');
+
return !trace_seq_has_overflowed(s);
}
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