From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Jiri Olsa <jolsa@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
linux-trace-users@vger.kernel.org
Subject: [RFC][PATCH 3/4] tracing: Add infrastructure to allow set_event_pid to follow children
Date: Tue, 19 Apr 2016 10:34:24 -0400 [thread overview]
Message-ID: <20160419143725.473997738@goodmis.org> (raw)
In-Reply-To: 20160419143421.829909157@goodmis.org
[-- Attachment #1: 0003-tracing-Add-infrastructure-to-allow-set_event_pid-to.patch --]
[-- Type: text/plain, Size: 5444 bytes --]
From: Steven Rostedt <rostedt@goodmis.org>
Add the infrastructure needed to have the PIDs in set_event_pid to
automatically add PIDs of the children of the tasks that have their PIDs in
set_event_pid. This will also remove PIDs from set_event_pid when a task
exits
This is implemented by adding hooks into the fork and exit tracepoints. On
fork, the PIDs are added to the list, and on exit, they are removed.
Add a new option called event_fork that when set, PIDs in set_event_pid will
automatically get their children PIDs added when they fork, as well as any
task that exits will have its PID removed from set_event_pid.
This works for instances as well.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace.c | 3 ++
kernel/trace/trace.h | 2 ++
kernel/trace/trace_events.c | 84 +++++++++++++++++++++++++++++++++++++++------
3 files changed, 79 insertions(+), 10 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a2f0b9f33e9b..0d12dbde8399 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3571,6 +3571,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
if (mask == TRACE_ITER_RECORD_CMD)
trace_event_enable_cmd_record(enabled);
+ if (mask == TRACE_ITER_EVENT_FORK)
+ trace_event_follow_fork(tr, enabled);
+
if (mask == TRACE_ITER_OVERWRITE) {
ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled);
#ifdef CONFIG_TRACER_MAX_TRACE
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 68cbb8e10aea..2525042760e6 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -655,6 +655,7 @@ static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
extern cycle_t ftrace_now(int cpu);
extern void trace_find_cmdline(int pid, char comm[]);
+extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
#ifdef CONFIG_DYNAMIC_FTRACE
extern unsigned long ftrace_update_tot_cnt;
@@ -966,6 +967,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
C(STOP_ON_FREE, "disable_on_free"), \
C(IRQ_INFO, "irq-info"), \
C(MARKERS, "markers"), \
+ C(EVENT_FORK, "event-fork"), \
FUNCTION_FLAGS \
FGRAPH_FLAGS \
STACK_FLAGS \
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 45f7cc72bf25..add81dff7520 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -474,11 +474,23 @@ static void ftrace_clear_events(struct trace_array *tr)
/* Shouldn't this be in a header? */
extern int pid_max;
+/* Returns true if found in filter */
static bool
-ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task)
+find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid)
{
- pid_t pid;
+ /*
+ * If pid_max changed after filtered_pids was created, we
+ * by default ignore all pids greater than the previous pid_max.
+ */
+ if (search_pid >= filtered_pids->pid_max)
+ return false;
+
+ return test_bit(search_pid, filtered_pids->pids);
+}
+static bool
+ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task)
+{
/*
* Return false, because if filtered_pids does not exist,
* all pids are good to trace.
@@ -486,16 +498,68 @@ ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task)
if (!filtered_pids)
return false;
- pid = task->pid;
+ return !find_filtered_pid(filtered_pids, task->pid);
+}
- /*
- * If pid_max changed after filtered_pids was created, we
- * by default ignore all pids greater than the previous pid_max.
- */
- if (task->pid >= filtered_pids->pid_max)
- return true;
+static void filter_add_remove_task(struct trace_pid_list *pid_list,
+ struct task_struct *self,
+ struct task_struct *task)
+{
+ if (!pid_list)
+ return;
+
+ /* For forks, we only add if the forking task is listed */
+ if (self) {
+ if (!find_filtered_pid(pid_list, self->pid))
+ return;
+ }
+
+ /* Sorry, but we don't support pid_max changing after setting */
+ if (task->pid >= pid_list->pid_max)
+ return;
+
+ /* "self" is set for forks, and NULL for exits */
+ if (self)
+ set_bit(task->pid, pid_list->pids);
+ else
+ clear_bit(task->pid, pid_list->pids);
+}
+
+static void
+event_filter_pid_sched_process_exit(void *data, struct task_struct *task)
+{
+ struct trace_pid_list *pid_list;
+ struct trace_array *tr = data;
+
+ pid_list = rcu_dereference_sched(tr->filtered_pids);
+ filter_add_remove_task(pid_list, NULL, task);
+}
- return !test_bit(task->pid, filtered_pids->pids);
+static void
+event_filter_pid_sched_process_fork(void *data,
+ struct task_struct *self,
+ struct task_struct *task)
+{
+ struct trace_pid_list *pid_list;
+ struct trace_array *tr = data;
+
+ pid_list = rcu_dereference_sched(tr->filtered_pids);
+ filter_add_remove_task(pid_list, self, task);
+}
+
+void trace_event_follow_fork(struct trace_array *tr, bool enable)
+{
+ if (enable) {
+ register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork,
+ tr, INT_MIN);
+ register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit,
+ tr, INT_MAX);
+ } else {
+ unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork,
+ tr);
+ unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit,
+ tr);
+ }
}
static void
--
2.8.0.rc3
next prev parent reply other threads:[~2016-04-19 14:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-19 14:34 [RFC][PATCH 0/4] tracing: Add event-fork to trace tasks children Steven Rostedt
2016-04-19 14:34 ` [RFC][PATCH 1/4] tracing: Rename check_ignore_pid() to ignore_this_task() Steven Rostedt
2016-04-19 14:34 ` [RFC][PATCH 2/4] tracing: Use pid bitmap instead of a pid array for set_event_pid Steven Rostedt
[not found] ` <1694657549.62933.1461084928341.JavaMail.zimbra@efficios.com>
2016-04-19 17:19 ` Steven Rostedt
[not found] ` <4ACF15B6-D344-4647-9CF8-CEDE5BF5EF70@zytor.com>
2016-04-19 19:41 ` Steven Rostedt
[not found] ` <2093660141.63332.1461097049611.JavaMail.zimbra@efficios.com>
2016-04-19 20:50 ` Steven Rostedt
[not found] ` <568915868.63547.1461100941927.JavaMail.zimbra@efficios.com>
2016-04-19 22:49 ` Steven Rostedt
[not found] ` <2099338042.63665.1461106754326.JavaMail.zimbra@efficios.com>
2016-04-19 23:06 ` Steven Rostedt
[not found] ` <20160422024530.GA1790@sejong>
2016-04-22 15:30 ` Steven Rostedt
2016-04-19 14:34 ` Steven Rostedt [this message]
[not found] ` <1887707510.62932.1461084911586.JavaMail.zimbra@efficios.com>
2016-04-19 17:13 ` [RFC][PATCH 3/4] tracing: Add infrastructure to allow set_event_pid to follow children Steven Rostedt
2016-04-19 14:34 ` [RFC][PATCH 4/4] tracing: Update the documentation to describe "event-fork" option Steven Rostedt
[not found] ` <5716E3E8.7000609@redhat.com>
2016-04-20 2:30 ` [RFC][PATCH 0/4] tracing: Add event-fork to trace tasks children Steven Rostedt
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