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fgraph: Remove redundant ftrace_graph_notrace_addr() test

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We already have tested it before. The second one should be removed.
With this change, the performance should have little improvement.

Link: http://lkml.kernel.org/r/20190730140850.7927-1-changbin.du@gmail.com

Cc: stable@vger.kernel.org
Fixes: 9cd2992f2d ("fgraph: Have set_graph_notrace only affect function_graph tracer")
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Changbin Du 2019-07-30 22:08:50 +08:00 • committed by Steven Rostedt (VMware)
parent b1d45c2328
commit 6c77221df9
1 changed files with 7 additions and 10 deletions
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17
kernel/trace/trace_functions_graph.c
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@ -137,6 +137,13 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
if (trace_recursion_test(TRACE_GRAPH_NOTRACE_BIT)) if (trace_recursion_test(TRACE_GRAPH_NOTRACE_BIT))
return 0; return 0;
/*
* Do not trace a function if it's filtered by set_graph_notrace.
* Make the index of ret stack negative to indicate that it should
* ignore further functions. But it needs its own ret stack entry
* to recover the original index in order to continue tracing after
* returning from the function.
*/
if (ftrace_graph_notrace_addr(trace->func)) { if (ftrace_graph_notrace_addr(trace->func)) {
trace_recursion_set(TRACE_GRAPH_NOTRACE_BIT); trace_recursion_set(TRACE_GRAPH_NOTRACE_BIT);
/* /*
@ -155,16 +162,6 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
if (ftrace_graph_ignore_irqs()) if (ftrace_graph_ignore_irqs())
return 0; return 0;
/*
* Do not trace a function if it's filtered by set_graph_notrace.
* Make the index of ret stack negative to indicate that it should
* ignore further functions. But it needs its own ret stack entry
* to recover the original index in order to continue tracing after
* returning from the function.
*/
if (ftrace_graph_notrace_addr(trace->func))
return 1;
/* /*
* Stop here if tracing_threshold is set. We only write function return * Stop here if tracing_threshold is set. We only write function return
* events to the ring buffer. * events to the ring buffer.