From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Namhyung Kim <namhyung@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Tom Zanussi <zanussi@kernel.org>,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>,
"Joel Fernandes (Google)" <joel@joelfernandes.org>
Subject: [for-next][PATCH 06/30] function_graph: Remove the use of FTRACE_NOTRACE_DEPTH
Date: Wed, 05 Dec 2018 18:47:55 -0500 [thread overview]
Message-ID: <20181205234829.305599061@goodmis.org> (raw)
In-Reply-To: 20181205234749.372720574@goodmis.org
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
The curr_ret_stack is no longer set to a negative value when a function is
not to be traced by the function graph tracer. Remove the usage of
FTRACE_NOTRACE_DEPTH, as it is no longer needed.
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/linux/ftrace.h | 1 -
kernel/trace/fgraph.c | 19 -------------------
kernel/trace/trace_functions_graph.c | 11 -----------
3 files changed, 31 deletions(-)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 10bd46434908..98625f10d982 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -790,7 +790,6 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
*/
#define __notrace_funcgraph notrace
-#define FTRACE_NOTRACE_DEPTH 65536
#define FTRACE_RETFUNC_DEPTH 50
#define FTRACE_RETSTACK_ALLOC_SIZE 32
extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index e852b69c0e64..de887a983ac7 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -112,16 +112,6 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
index = current->curr_ret_stack;
- /*
- * A negative index here means that it's just returned from a
- * notrace'd function. Recover index to get an original
- * return address. See ftrace_push_return_trace().
- *
- * TODO: Need to check whether the stack gets corrupted.
- */
- if (index < 0)
- index += FTRACE_NOTRACE_DEPTH;
-
if (unlikely(index < 0 || index >= FTRACE_RETFUNC_DEPTH)) {
ftrace_graph_stop();
WARN_ON(1);
@@ -190,15 +180,6 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
*/
barrier();
current->curr_ret_stack--;
- /*
- * The curr_ret_stack can be less than -1 only if it was
- * filtered out and it's about to return from the function.
- * Recover the index and continue to trace normal functions.
- */
- if (current->curr_ret_stack < -1) {
- current->curr_ret_stack += FTRACE_NOTRACE_DEPTH;
- return ret;
- }
if (unlikely(!ret)) {
ftrace_graph_stop();
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index ecf543df943b..eaf9b1629956 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -115,9 +115,6 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
if (ret != (unsigned long)return_to_handler)
return ret;
- if (index < -1)
- index += FTRACE_NOTRACE_DEPTH;
-
if (index < 0)
return ret;
@@ -675,10 +672,6 @@ print_graph_entry_leaf(struct trace_iterator *iter,
cpu_data = per_cpu_ptr(data->cpu_data, cpu);
- /* If a graph tracer ignored set_graph_notrace */
- if (call->depth < -1)
- call->depth += FTRACE_NOTRACE_DEPTH;
-
/*
* Comments display at + 1 to depth. Since
* this is a leaf function, keep the comments
@@ -721,10 +714,6 @@ print_graph_entry_nested(struct trace_iterator *iter,
struct fgraph_cpu_data *cpu_data;
int cpu = iter->cpu;
- /* If a graph tracer ignored set_graph_notrace */
- if (call->depth < -1)
- call->depth += FTRACE_NOTRACE_DEPTH;
-
cpu_data = per_cpu_ptr(data->cpu_data, cpu);
cpu_data->depth = call->depth;
--
2.19.1
next prev parent reply other threads:[~2018-12-05 23:50 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 23:47 [for-next][PATCH 00/30] tracing: Updates for the next merge window Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 01/30] function_graph: Remove unused task_curr_ret_stack() Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 02/30] tracing: Do not line wrap short line in function_graph_enter() Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 03/30] fgraph: Create a fgraph.c file to store function graph infrastructure Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 04/30] fgraph: Have set_graph_notrace only affect function_graph tracer Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 05/30] arm64: function_graph: Remove use of FTRACE_NOTRACE_DEPTH Steven Rostedt
2018-12-06 3:55 ` Steven Rostedt
2018-12-06 15:49 ` Will Deacon
2018-12-06 15:55 ` Steven Rostedt
2018-12-05 23:47 ` Steven Rostedt [this message]
2018-12-05 23:47 ` [for-next][PATCH 07/30] ftrace: Create new ftrace_internal.h header Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 08/30] function_graph: Do not expose the graph_time option when profiler is not configured Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 09/30] fgraph: Move function graph specific code into fgraph.c Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 10/30] tracing: Rearrange functions in trace_sched_wakeup.c Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 11/30] fgraph: Add new fgraph_ops structure to enable function graph hooks Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 12/30] function_graph: Move ftrace_graph_ret_addr() to fgraph.c Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 13/30] function_graph: Have profiler use new helper ftrace_graph_get_ret_stack() Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 14/30] tracing: Have trace_stack nr_entries compare not be so subtle Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 15/30] scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 16/30] ring-buffer: Add percentage of ring buffer full to wake up reader Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 17/30] tracing: Add tracefs file buffer_percentage Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 18/30] tracing: Change default buffer_percent to 50 Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 19/30] tracing/uprobes: Add busy check when cleanup all uprobes Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 20/30] tracing: Lock event_mutex before synth_event_mutex Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 21/30] tracing: Simplify creation and deletion of synthetic events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 22/30] tracing: Integrate similar probe argument parsers Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 23/30] tracing: Add unified dynamic event framework Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 24/30] tracing/kprobes: Use dyn_event framework for kprobe events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 25/30] tracing/uprobes: Use dyn_event framework for uprobe events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 26/30] tracing: Use dyn_event framework for synthetic events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 27/30] tracing: Remove unneeded synth_event_mutex Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 28/30] tracing: Consolidate trace_add/remove_event_call back to the nolock functions Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 29/30] tracing: Add generic event-name based remove event method Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 30/30] selftests/ftrace: Add testcases for dynamic event Steven Rostedt
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