On 10/9/24 16:20, Sebastian Andrzej Siewior wrote:
The scheduler added NEED_RESCHED_LAZY scheduling. Record this state as
part of trace flags and expose it in the need_resched field.
Record and expose NEED_RESCHED_LAZY.
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
---
include/linux/trace_events.h | 1 +
kernel/trace/trace.c | 2 ++
kernel/trace/trace_output.c | 14 +++++++++++++-
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index d5c0fcf20f024..4cae6f2581379 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -185,6 +185,7 @@ unsigned int tracing_gen_ctx_irq_test(unsigned int
irqs_status);
enum trace_flag_type {
TRACE_FLAG_IRQS_OFF = 0x01,
TRACE_FLAG_NEED_RESCHED = 0x02,
+ TRACE_FLAG_NEED_RESCHED_LAZY = 0x04,
TRACE_FLAG_HARDIRQ = 0x08,
TRACE_FLAG_SOFTIRQ = 0x10,
TRACE_FLAG_PREEMPT_RESCHED = 0x20,
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1c69ca1f10886..29d7703751aa9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2544,6 +2544,8 @@ 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;
+ if (tif_test_bit(TIF_NEED_RESCHED_LAZY))
+ trace_flags |= TRACE_FLAG_NEED_RESCHED_LAZY;
return (trace_flags << 16) | (min_t(unsigned int, pc & 0xff, 0xf)) |
(min_t(unsigned int, migration_disable_value(), 0xf)) << 4;
}
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 829daa0764dd9..23ca2155306b1 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -463,17 +463,29 @@ int trace_print_lat_fmt(struct trace_seq *s, struct
trace_entry *entry)
!IS_ENABLED(CONFIG_TRACE_IRQFLAGS_SUPPORT) ? 'X' :
'.';
- switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
+ switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
TRACE_FLAG_NEED_RESCHED_LAZY |
TRACE_FLAG_PREEMPT_RESCHED)) {
+ case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY |
TRACE_FLAG_PREEMPT_RESCHED:
+ need_resched = 'B';
+ break;
case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
need_resched = 'N';
break;
+ case TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
+ need_resched = 'L';
+ break;
+ case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY:
+ need_resched = 'b';
+ break;
case TRACE_FLAG_NEED_RESCHED:
need_resched = 'n';
break;
case TRACE_FLAG_PREEMPT_RESCHED:
need_resched = 'p';
break;
+ case TRACE_FLAG_NEED_RESCHED_LAZY:
+ need_resched = 'l';
+ break;
default:
need_resched = '.';
break;
Could you please update in Documentation/trace/ftrace.rst as well?
