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Message-ID: <20251114192318.950255167@kernel.org>
Date: Fri, 14 Nov 2025 14:22:32 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/4] tracing: Have function graph tracer option sleep-time be per instance
From: Steven Rostedt <rostedt@...dmis.org>
Currently the option to have function graph tracer to ignore time spent
when a task is sleeping is global when the interface is per-instance.
Changing the value in one instance will affect the results of another
instance that is also running the function graph tracer. This can lead to
confusing results.
Fixes: c132be2c4fcc1 ("function_graph: Have the instances use their own ftrace_ops for filtering")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
kernel/trace/fgraph.c | 10 +----
kernel/trace/ftrace.c | 4 +-
kernel/trace/trace.h | 5 +--
kernel/trace/trace_functions_graph.c | 64 +++++++++++++++++++++++-----
4 files changed, 60 insertions(+), 23 deletions(-)
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 484ad7a18463..7fb9b169d6d4 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -498,9 +498,6 @@ void *fgraph_retrieve_parent_data(int idx, int *size_bytes, int depth)
return get_data_type_data(current, offset);
}
-/* Both enabled by default (can be cleared by function_graph tracer flags */
-bool fgraph_sleep_time = true;
-
#ifdef CONFIG_DYNAMIC_FTRACE
/*
* archs can override this function if they must do something
@@ -1023,11 +1020,6 @@ void fgraph_init_ops(struct ftrace_ops *dst_ops,
#endif
}
-void ftrace_graph_sleep_time_control(bool enable)
-{
- fgraph_sleep_time = enable;
-}
-
/*
* Simply points to ftrace_stub, but with the proper protocol.
* Defined by the linker script in linux/vmlinux.lds.h
@@ -1098,7 +1090,7 @@ ftrace_graph_probe_sched_switch(void *ignore, bool preempt,
* Does the user want to count the time a function was asleep.
* If so, do not update the time stamps.
*/
- if (fgraph_sleep_time)
+ if (!fgraph_no_sleep_time)
return;
timestamp = trace_clock_local();
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ab601cd9638b..7c3bbebeec7a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -862,6 +862,8 @@ static int profile_graph_entry(struct ftrace_graph_ent *trace,
return 1;
}
+bool fprofile_no_sleep_time;
+
static void profile_graph_return(struct ftrace_graph_ret *trace,
struct fgraph_ops *gops,
struct ftrace_regs *fregs)
@@ -887,7 +889,7 @@ static void profile_graph_return(struct ftrace_graph_ret *trace,
calltime = rettime - profile_data->calltime;
- if (!fgraph_sleep_time) {
+ if (fprofile_no_sleep_time) {
if (current->ftrace_sleeptime)
calltime -= current->ftrace_sleeptime - profile_data->sleeptime;
}
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 41b416a22450..58be6d741d72 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -943,8 +943,6 @@ static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
-extern void ftrace_graph_sleep_time_control(bool enable);
-
#ifdef CONFIG_FUNCTION_PROFILER
extern void ftrace_graph_graph_time_control(bool enable);
#else
@@ -1115,7 +1113,8 @@ static inline void ftrace_graph_addr_finish(struct fgraph_ops *gops, struct ftra
#endif /* CONFIG_DYNAMIC_FTRACE */
extern unsigned int fgraph_max_depth;
-extern bool fgraph_sleep_time;
+extern unsigned int fgraph_no_sleep_time;
+extern bool fprofile_no_sleep_time;
static inline bool
ftrace_graph_ignore_func(struct fgraph_ops *gops, struct ftrace_graph_ent *trace)
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 53adbe4bfedb..12315eb65925 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -19,6 +19,9 @@
/* When set, irq functions might be ignored */
static int ftrace_graph_skip_irqs;
+/* Do not record function time when task is sleeping */
+unsigned int fgraph_no_sleep_time;
+
struct fgraph_cpu_data {
pid_t last_pid;
int depth;
@@ -239,13 +242,14 @@ static int graph_entry(struct ftrace_graph_ent *trace,
if (ftrace_graph_ignore_irqs(tr))
return 0;
- if (fgraph_sleep_time) {
- /* Only need to record the calltime */
- ftimes = fgraph_reserve_data(gops->idx, sizeof(ftimes->calltime));
- } else {
+ if (fgraph_no_sleep_time &&
+ !tracer_flags_is_set(tr, TRACE_GRAPH_SLEEP_TIME)) {
ftimes = fgraph_reserve_data(gops->idx, sizeof(*ftimes));
if (ftimes)
ftimes->sleeptime = current->ftrace_sleeptime;
+ } else {
+ /* Only need to record the calltime */
+ ftimes = fgraph_reserve_data(gops->idx, sizeof(ftimes->calltime));
}
if (!ftimes)
return 0;
@@ -331,11 +335,15 @@ void __trace_graph_return(struct trace_array *tr,
trace_buffer_unlock_commit_nostack(buffer, event);
}
-static void handle_nosleeptime(struct ftrace_graph_ret *trace,
+static void handle_nosleeptime(struct trace_array *tr,
+ struct ftrace_graph_ret *trace,
struct fgraph_times *ftimes,
int size)
{
- if (fgraph_sleep_time || size < sizeof(*ftimes))
+ if (size < sizeof(*ftimes))
+ return;
+
+ if (!fgraph_no_sleep_time || tracer_flags_is_set(tr, TRACE_GRAPH_SLEEP_TIME))
return;
ftimes->calltime += current->ftrace_sleeptime - ftimes->sleeptime;
@@ -364,7 +372,7 @@ void trace_graph_return(struct ftrace_graph_ret *trace,
if (!ftimes)
return;
- handle_nosleeptime(trace, ftimes, size);
+ handle_nosleeptime(tr, trace, ftimes, size);
calltime = ftimes->calltime;
@@ -377,6 +385,7 @@ static void trace_graph_thresh_return(struct ftrace_graph_ret *trace,
struct ftrace_regs *fregs)
{
struct fgraph_times *ftimes;
+ struct trace_array *tr;
int size;
ftrace_graph_addr_finish(gops, trace);
@@ -390,7 +399,8 @@ static void trace_graph_thresh_return(struct ftrace_graph_ret *trace,
if (!ftimes)
return;
- handle_nosleeptime(trace, ftimes, size);
+ tr = gops->private;
+ handle_nosleeptime(tr, trace, ftimes, size);
if (tracing_thresh &&
(trace_clock_local() - ftimes->calltime < tracing_thresh))
@@ -452,6 +462,9 @@ static int graph_trace_init(struct trace_array *tr)
if (!tracer_flags_is_set(tr, TRACE_GRAPH_PRINT_IRQS))
ftrace_graph_skip_irqs++;
+ if (!tracer_flags_is_set(tr, TRACE_GRAPH_SLEEP_TIME))
+ fgraph_no_sleep_time++;
+
/* Make gops functions visible before we start tracing */
smp_mb();
@@ -494,6 +507,11 @@ static void graph_trace_reset(struct trace_array *tr)
if (WARN_ON_ONCE(ftrace_graph_skip_irqs < 0))
ftrace_graph_skip_irqs = 0;
+ if (!tracer_flags_is_set(tr, TRACE_GRAPH_SLEEP_TIME))
+ fgraph_no_sleep_time--;
+ if (WARN_ON_ONCE(fgraph_no_sleep_time < 0))
+ fgraph_no_sleep_time = 0;
+
tracing_stop_cmdline_record();
unregister_ftrace_graph(tr->gops);
}
@@ -1619,8 +1637,24 @@ void graph_trace_close(struct trace_iterator *iter)
static int
func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
- if (bit == TRACE_GRAPH_SLEEP_TIME)
- ftrace_graph_sleep_time_control(set);
+/*
+ * The function profiler gets updated even if function graph
+ * isn't the current tracer. Handle it separately.
+ */
+#ifdef CONFIG_FUNCTION_PROFILER
+ if (bit == TRACE_GRAPH_SLEEP_TIME && (tr->flags & TRACE_ARRAY_FL_GLOBAL) &&
+ !!set == fprofile_no_sleep_time) {
+ if (set) {
+ fgraph_no_sleep_time--;
+ if (WARN_ON_ONCE(fgraph_no_sleep_time < 0))
+ fgraph_no_sleep_time = 0;
+ fprofile_no_sleep_time = false;
+ } else {
+ fgraph_no_sleep_time++;
+ fprofile_no_sleep_time = true;
+ }
+ }
+#endif
/* Do nothing if the current tracer is not this tracer */
if (tr->current_trace != &graph_trace)
@@ -1630,6 +1664,16 @@ func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (!!set == !!(tr->current_trace_flags->val & bit))
return 0;
+ if (bit == TRACE_GRAPH_SLEEP_TIME) {
+ if (set) {
+ fgraph_no_sleep_time--;
+ if (WARN_ON_ONCE(fgraph_no_sleep_time < 0))
+ fgraph_no_sleep_time = 0;
+ } else {
+ fgraph_no_sleep_time++;
+ }
+ }
+
if (bit == TRACE_GRAPH_PRINT_IRQS) {
if (set)
ftrace_graph_skip_irqs--;
--
2.51.0
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