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-rw-r--r--debian/patches-rt/0226-trace-Add-migrate-disabled-counter-to-tracing-output.patch123
1 files changed, 123 insertions, 0 deletions
diff --git a/debian/patches-rt/0226-trace-Add-migrate-disabled-counter-to-tracing-output.patch b/debian/patches-rt/0226-trace-Add-migrate-disabled-counter-to-tracing-output.patch
new file mode 100644
index 000000000..23ba35a68
--- /dev/null
+++ b/debian/patches-rt/0226-trace-Add-migrate-disabled-counter-to-tracing-output.patch
@@ -0,0 +1,123 @@
+From 61f802c21cb2e063c6e8b39e9f497f2d38440b5a Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Sun, 17 Jul 2011 21:56:42 +0200
+Subject: [PATCH 226/323] trace: Add migrate-disabled counter to tracing output
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ include/linux/trace_events.h | 2 ++
+ kernel/trace/trace.c | 26 +++++++++++++++++++-------
+ kernel/trace/trace_events.c | 1 +
+ kernel/trace/trace_output.c | 5 +++++
+ 4 files changed, 27 insertions(+), 7 deletions(-)
+
+diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
+index 2fea9fcd4d4e..2151524a10f0 100644
+--- a/include/linux/trace_events.h
++++ b/include/linux/trace_events.h
+@@ -69,6 +69,7 @@ struct trace_entry {
+ unsigned char flags;
+ unsigned char preempt_count;
+ int pid;
++ unsigned char migrate_disable;
+ };
+
+ #define TRACE_EVENT_TYPE_MAX \
+@@ -157,6 +158,7 @@ static inline void tracing_generic_entry_update(struct trace_entry *entry,
+ unsigned int trace_ctx)
+ {
+ entry->preempt_count = trace_ctx & 0xff;
++ entry->migrate_disable = (trace_ctx >> 8) & 0xff;
+ entry->pid = current->pid;
+ entry->type = type;
+ entry->flags = trace_ctx >> 16;
+diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
+index 5d6730589823..02dffb1862b8 100644
+--- a/kernel/trace/trace.c
++++ b/kernel/trace/trace.c
+@@ -2575,6 +2575,15 @@ enum print_line_t trace_handle_return(struct trace_seq *s)
+ }
+ EXPORT_SYMBOL_GPL(trace_handle_return);
+
++static unsigned short migration_disable_value(void)
++{
++#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
++ return current->migration_disabled;
++#else
++ return 0;
++#endif
++}
++
+ unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
+ {
+ unsigned int trace_flags = irqs_status;
+@@ -2593,7 +2602,8 @@ unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
+ trace_flags |= TRACE_FLAG_NEED_RESCHED;
+ if (test_preempt_need_resched())
+ trace_flags |= TRACE_FLAG_PREEMPT_RESCHED;
+- return (trace_flags << 16) | (pc & 0xff);
++ return (trace_flags << 16) | (pc & 0xff) |
++ (migration_disable_value() & 0xff) << 8;
+ }
+
+ struct ring_buffer_event *
+@@ -3856,9 +3866,10 @@ static void print_lat_help_header(struct seq_file *m)
+ "# | / _----=> 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 array_buffer *buf, struct seq_file *m)
+@@ -3896,9 +3907,10 @@ static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file
+ seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space);
+ seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space);
+ seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space);
+- seq_printf(m, "# %.*s||| / delay\n", prec, space);
+- seq_printf(m, "# TASK-PID %.*s CPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID ");
+- seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | ");
++ seq_printf(m, "# %.*s||| / _-=> migrate-disable\n", prec, space);
++ seq_printf(m, "# %.*s|||| / delay\n", prec, space);
++ seq_printf(m, "# TASK-PID %.*s CPU# ||||| TIMESTAMP FUNCTION\n", prec, " TGID ");
++ seq_printf(m, "# | | %.*s | ||||| | |\n", prec, " | ");
+ }
+
+ void
+diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
+index df64b92c5edc..636fb7df3714 100644
+--- a/kernel/trace/trace_events.c
++++ b/kernel/trace/trace_events.c
+@@ -184,6 +184,7 @@ static int trace_define_common_fields(void)
+ __common_field(unsigned char, flags);
+ __common_field(unsigned char, preempt_count);
+ __common_field(int, pid);
++ __common_field(unsigned char, migrate_disable);
+
+ return ret;
+ }
+diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
+index 94b0991717b6..b3619b21217c 100644
+--- a/kernel/trace/trace_output.c
++++ b/kernel/trace/trace_output.c
+@@ -497,6 +497,11 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
+ 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);
+ }
+
+--
+2.43.0
+