From: Thomas Gleixner 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/4.18/older/patches-4.18.5-rt3.tar.xz Signed-off-by: Thomas Gleixner --- 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 @@ -2145,6 +2145,8 @@ 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); @@ -3348,9 +3350,10 @@ 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 @@ -187,6 +187,8 @@ 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 @@ -493,6 +493,11 @@ 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); }