From: Tom Zanussi <tom.zanussi@linux.intel.com>
To: rostedt@goodmis.org
Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org,
vedang.patel@intel.com, bigeasy@linutronix.de,
joel.opensrc@gmail.com, joelaf@google.com,
mathieu.desnoyers@efficios.com, baohong.liu@intel.com,
rajvi.jingar@intel.com, julia@ni.com,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH v4 05/37] ring-buffer: Add interface for setting absolute time stamps
Date: Mon, 30 Oct 2017 15:51:47 -0500 [thread overview]
Message-ID: <8b024fd77acc6195eb764ca0af8a8e754ecbe2c0.1509395595.git.tom.zanussi@linux.intel.com> (raw)
In-Reply-To: <cover.1509395595.git.tom.zanussi@linux.intel.com>
In-Reply-To: <cover.1509395595.git.tom.zanussi@linux.intel.com>
Define a new function, tracing_set_time_stamp_abs(), which can be used
to enable or disable the use of absolute timestamps rather than time
deltas for a trace array.
Only the interface is added here; a subsequent patch will add the
underlying implementation.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Baohong Liu <baohong.liu@intel.com>
---
include/linux/ring_buffer.h | 2 ++
kernel/trace/ring_buffer.c | 11 +++++++++++
kernel/trace/trace.c | 33 ++++++++++++++++++++++++++++++++-
kernel/trace/trace.h | 3 +++
4 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index ee9b461..28e3472 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -180,6 +180,8 @@ void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
int cpu, u64 *ts);
void ring_buffer_set_clock(struct ring_buffer *buffer,
u64 (*clock)(void));
+void ring_buffer_set_time_stamp_abs(struct ring_buffer *buffer, bool abs);
+bool ring_buffer_time_stamp_abs(struct ring_buffer *buffer);
size_t ring_buffer_page_len(void *page);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index f6ee9b1..1e5b75a 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -485,6 +485,7 @@ struct ring_buffer {
u64 (*clock)(void);
struct rb_irq_work irq_work;
+ bool time_stamp_abs;
};
struct ring_buffer_iter {
@@ -1379,6 +1380,16 @@ void ring_buffer_set_clock(struct ring_buffer *buffer,
buffer->clock = clock;
}
+void ring_buffer_set_time_stamp_abs(struct ring_buffer *buffer, bool abs)
+{
+ buffer->time_stamp_abs = abs;
+}
+
+bool ring_buffer_time_stamp_abs(struct ring_buffer *buffer)
+{
+ return buffer->time_stamp_abs;
+}
+
static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
static inline unsigned long rb_page_entries(struct buffer_page *bpage)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 73e67b6..459924f 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2269,7 +2269,7 @@ struct ring_buffer_event *
*current_rb = trace_file->tr->trace_buffer.buffer;
- if ((trace_file->flags &
+ if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags &
(EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) &&
(entry = this_cpu_read(trace_buffered_event))) {
/* Try to use the per cpu buffer first */
@@ -6298,6 +6298,37 @@ static int tracing_clock_open(struct inode *inode, struct file *file)
return ret;
}
+int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs)
+{
+ int ret = 0;
+
+ mutex_lock(&trace_types_lock);
+
+ if (abs && tr->time_stamp_abs_ref++)
+ goto out;
+
+ if (!abs) {
+ if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (--tr->time_stamp_abs_ref)
+ goto out;
+ }
+
+ ring_buffer_set_time_stamp_abs(tr->trace_buffer.buffer, abs);
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (tr->max_buffer.buffer)
+ ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs);
+#endif
+ out:
+ mutex_unlock(&trace_types_lock);
+
+ return ret;
+}
+
struct ftrace_buffer_info {
struct trace_iterator iter;
void *spare;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f8343eb..4d8bde0 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -272,6 +272,7 @@ struct trace_array {
/* function tracing enabled */
int function_enabled;
#endif
+ int time_stamp_abs_ref;
};
enum {
@@ -285,6 +286,8 @@ enum {
extern int trace_array_get(struct trace_array *tr);
extern void trace_array_put(struct trace_array *tr);
+extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
+
/*
* The global tracer (top) should be the first trace array added,
* but we check the flag anyway.
--
1.9.3
next prev parent reply other threads:[~2017-10-30 21:01 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-30 20:51 [PATCH v4 00/37] tracing: Inter-event (e.g. latency) support Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 01/37] tracing: Move hist trigger Documentation to histogram.txt Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 02/37] tracing: Add Documentation for log2 modifier Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 03/37] tracing: Add support to detect and avoid duplicates Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 04/37] tracing: Remove code which merges duplicates Tom Zanussi
2017-10-30 20:51 ` Tom Zanussi [this message]
2017-10-30 20:51 ` [PATCH v4 06/37] ring-buffer: Redefine the unimplemented RINGBUF_TYPE_TIME_STAMP Tom Zanussi
2017-11-06 5:09 ` Namhyung Kim
2017-11-06 15:52 ` Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 07/37] tracing: Add timestamp_mode trace file Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 08/37] tracing: Give event triggers access to ring_buffer_event Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 09/37] tracing: Add ring buffer event param to hist field functions Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 10/37] tracing: Break out hist trigger assignment parsing Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 11/37] tracing: Add hist trigger timestamp support Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 12/37] tracing: Add per-element variable support to tracing_map Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 13/37] tracing: Add hist_data member to hist_field Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 14/37] tracing: Add usecs modifier for hist trigger timestamps Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 15/37] tracing: Add variable support to hist triggers Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 16/37] tracing: Account for variables in named trigger compatibility Tom Zanussi
2017-10-30 20:51 ` [PATCH v4 17/37] tracing: Move get_hist_field_flags() Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 18/37] tracing: Add simple expression support to hist triggers Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 19/37] tracing: Generalize per-element hist trigger data Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 20/37] tracing: Pass tracing_map_elt to hist_field accessor functions Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 21/37] tracing: Add hist_field 'type' field Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 22/37] tracing: Add variable reference handling to hist triggers Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 23/37] tracing: Add hist trigger action hook Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 24/37] tracing: Add support for 'synthetic' events Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 25/37] tracing: Add support for 'field variables' Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 26/37] tracing: Add 'onmatch' hist trigger action support Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 27/37] tracing: Add 'onmax' " Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 28/37] tracing: Allow whitespace to surround hist trigger filter Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 29/37] tracing: Add cpu field for hist triggers Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 30/37] tracing: Add hist trigger support for variable reference aliases Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 31/37] tracing: Add 'last error' error facility for hist triggers Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 32/37] tracing: Add inter-event hist trigger Documentation Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 33/37] tracing: Make tracing_set_clock() non-static Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 34/37] tracing: Add a clock attribute for hist triggers Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 35/37] tracing: Increase trace_recursive_lock() limit for synthetic events Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 36/37] tracing: Add inter-event blurb to HIST_TRIGGERS config option Tom Zanussi
2017-10-30 20:52 ` [PATCH v4 37/37] selftests: ftrace: Add inter-event hist triggers testcases Tom Zanussi
2017-10-31 14:29 ` Masami Hiramatsu
2017-10-31 20:40 ` Jingar, Rajvi
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