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, linux-kernel@vger.kernel.org,
linux-rt-users@vger.kernel.org,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH 10/32] tracing: Add NO_DISCARD event file flag
Date: Mon, 26 Jun 2017 17:49:11 -0500 [thread overview]
Message-ID: <39effea57d7b72d262ed98f376bd1f722ca71559.1498510759.git.tom.zanussi@linux.intel.com> (raw)
In-Reply-To: <cover.1498510759.git.tom.zanussi@linux.intel.com>
In-Reply-To: <cover.1498510759.git.tom.zanussi@linux.intel.com>
Whenever an event_command has a post-trigger that needs access to the
event record, the event record can't be discarded, or the post-trigger
will eventually see bogus data.
In order to allow the discard check to treat this case separately, add
an EVENT_FILE_FL_NO_DISCARD flag to the event file flags, along with
code in the discard check that checks the flag and avoids the discard
when the flag is set.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
---
include/linux/trace_events.h | 3 +++
kernel/trace/trace.h | 13 ++++++++++---
kernel/trace/trace_events_trigger.c | 16 +++++++++++++---
3 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index f333114..d7b230b 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -297,6 +297,7 @@ enum {
EVENT_FILE_FL_TRIGGER_MODE_BIT,
EVENT_FILE_FL_TRIGGER_COND_BIT,
EVENT_FILE_FL_PID_FILTER_BIT,
+ EVENT_FILE_FL_NO_DISCARD_BIT,
};
/*
@@ -311,6 +312,7 @@ enum {
* TRIGGER_MODE - When set, invoke the triggers associated with the event
* TRIGGER_COND - When set, one or more triggers has an associated filter
* PID_FILTER - When set, the event is filtered based on pid
+ * NO_DISCARD - When set, do not discard events, something needs them later
*/
enum {
EVENT_FILE_FL_ENABLED = (1 << EVENT_FILE_FL_ENABLED_BIT),
@@ -322,6 +324,7 @@ enum {
EVENT_FILE_FL_TRIGGER_MODE = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
EVENT_FILE_FL_TRIGGER_COND = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
EVENT_FILE_FL_PID_FILTER = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
+ EVENT_FILE_FL_NO_DISCARD = (1 << EVENT_FILE_FL_NO_DISCARD_BIT),
};
struct trace_event_file {
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 78c7694..81b1d07 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1271,9 +1271,16 @@ static inline void trace_buffer_unlock_commit(struct trace_array *tr,
if (eflags & EVENT_FILE_FL_TRIGGER_COND)
*tt = event_triggers_call(file, entry, event);
- if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
- (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
- !filter_match_preds(file->filter, entry))) {
+ if (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
+ !filter_match_preds(file->filter, entry)) {
+ __trace_event_discard_commit(buffer, event);
+ return true;
+ }
+
+ if (test_bit(EVENT_FILE_FL_NO_DISCARD_BIT, &file->flags))
+ return false;
+
+ if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags)) {
__trace_event_discard_commit(buffer, event);
return true;
}
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 9b0fe31..d345820 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -505,20 +505,30 @@ int trace_event_trigger_enable_disable(struct trace_event_file *file,
void update_cond_flag(struct trace_event_file *file)
{
struct event_trigger_data *data;
- bool set_cond = false;
+ bool set_cond = false, set_no_discard = false;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->filter || event_command_post_trigger(data->cmd_ops) ||
- event_command_needs_rec(data->cmd_ops)) {
+ event_command_needs_rec(data->cmd_ops))
set_cond = true;
+
+ if (event_command_post_trigger(data->cmd_ops) &&
+ event_command_needs_rec(data->cmd_ops))
+ set_no_discard = true;
+
+ if (set_cond && set_no_discard)
break;
- }
}
if (set_cond)
set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
else
clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags);
+
+ if (set_no_discard)
+ set_bit(EVENT_FILE_FL_NO_DISCARD_BIT, &file->flags);
+ else
+ clear_bit(EVENT_FILE_FL_NO_DISCARD_BIT, &file->flags);
}
/**
--
1.9.3
next prev parent reply other threads:[~2017-06-26 22:56 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 22:49 [PATCH 00/32] tracing: Inter-event (e.g. latency) support Tom Zanussi
2017-06-26 22:49 ` [PATCH 01/32] tracing: Add hist_field_name() accessor Tom Zanussi
2017-07-13 6:49 ` Piotr Gregor
2017-07-13 14:41 ` Tom Zanussi
2017-07-14 2:19 ` Namhyung Kim
2017-06-26 22:49 ` [PATCH 02/32] tracing: Reimplement log2 Tom Zanussi
2017-07-14 2:33 ` Namhyung Kim
2017-07-14 16:13 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 03/32] ring-buffer: Add interface for setting absolute time stamps Tom Zanussi
2017-07-14 5:25 ` Namhyung Kim
2017-07-14 16:14 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 04/32] ring-buffer: Redefine the unimplemented RINGBUF_TIME_TIME_STAMP Tom Zanussi
2017-07-02 8:51 ` Joel Fernandes (Google)
2017-06-26 22:49 ` [PATCH 05/32] tracing: Give event triggers access to ring_buffer_event Tom Zanussi
2017-06-26 22:49 ` [PATCH 06/32] tracing: Add ring buffer event param to hist field functions Tom Zanussi
2017-06-26 22:49 ` [PATCH 07/32] tracing: Increase tracing map KEYS_MAX size Tom Zanussi
2017-06-26 22:49 ` [PATCH 08/32] tracing: Break out hist trigger assignment parsing Tom Zanussi
2017-06-26 22:49 ` [PATCH 09/32] tracing: Make traceprobe parsing code reusable Tom Zanussi
2017-06-26 22:49 ` Tom Zanussi [this message]
2017-06-26 22:49 ` [PATCH 11/32] tracing: Add post-trigger flag to hist trigger command Tom Zanussi
2017-06-26 22:49 ` [PATCH 12/32] tracing: Add hist trigger timestamp support Tom Zanussi
2017-07-17 6:00 ` Namhyung Kim
2017-07-17 16:57 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 13/32] tracing: Add per-element variable support to tracing_map Tom Zanussi
2017-06-26 22:49 ` [PATCH 14/32] tracing: Add hist_data member to hist_field Tom Zanussi
2017-06-26 22:49 ` [PATCH 15/32] tracing: Add usecs modifier for hist trigger timestamps Tom Zanussi
2017-06-26 22:49 ` [PATCH 16/32] tracing: Add variable support to hist triggers Tom Zanussi
2017-07-19 1:07 ` Namhyung Kim
2017-07-19 15:40 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 17/32] tracing: Account for variables in named trigger compatibility Tom Zanussi
2017-06-26 22:49 ` [PATCH 18/32] tracing: Add simple expression support to hist triggers Tom Zanussi
2017-07-21 2:02 ` Namhyung Kim
2017-07-21 16:29 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 19/32] tracing: Add variable reference handling " Tom Zanussi
2017-07-21 3:31 ` Namhyung Kim
2017-07-21 16:41 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 20/32] tracing: Add support for dynamic tracepoints Tom Zanussi
2017-06-26 22:49 ` [PATCH 21/32] tracing: Add hist trigger action hook Tom Zanussi
2017-06-26 22:49 ` [PATCH 22/32] tracing: Add support for 'synthetic' events Tom Zanussi
2017-07-23 12:00 ` Namhyung Kim
2017-07-24 16:11 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 23/32] tracing: Add 'onmatch' hist trigger action support Tom Zanussi
2017-07-23 15:12 ` Namhyung Kim
2017-07-24 16:17 ` Tom Zanussi
2017-07-26 2:40 ` Namhyung Kim
2017-07-26 16:38 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 24/32] tracing: Add 'onmax' " Tom Zanussi
2017-07-26 3:04 ` Namhyung Kim
2017-07-26 16:45 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 25/32] tracing: Allow whitespace to surround hist trigger filter Tom Zanussi
2017-06-26 22:49 ` [PATCH 26/32] tracing: Make duplicate count from tracing_map available Tom Zanussi
2017-06-26 22:49 ` [PATCH 27/32] tracing: Add cpu field for hist triggers Tom Zanussi
2017-06-26 22:49 ` [PATCH 28/32] tracing: Add hist trigger support for variable reference aliases Tom Zanussi
2017-06-26 22:49 ` [PATCH 29/32] tracing: Add 'last error' error facility for hist triggers Tom Zanussi
2017-07-26 4:39 ` Namhyung Kim
2017-07-26 16:47 ` Tom Zanussi
2017-06-26 22:49 ` [PATCH 30/32] tracing: Add inter-event hist trigger Documentation Tom Zanussi
2017-06-26 22:49 ` [PATCH 31/32] tracing: Make tracing_set_clock() non-static Tom Zanussi
2017-06-26 22:49 ` [PATCH 32/32] tracing: Add a clock attribute for hist triggers Tom Zanussi
2017-06-27 14:58 ` [PATCH 00/32] tracing: Inter-event (e.g. latency) support Steven Rostedt
2017-06-28 14:21 ` Masami Hiramatsu
2017-06-28 19:09 ` Tom Zanussi
2017-07-01 7:01 ` Joel Fernandes (Google)
2017-07-12 19:17 ` Tom Zanussi
2017-07-04 16:12 ` Sebastian Andrzej Siewior
2017-07-12 19:20 ` Tom Zanussi
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