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ftrace: function graph return for function entry

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Impact: feature, let entry function decide to trace or not

This patch lets the graph tracer entry function decide if the tracing
should be done at the end as well. This requires all function graph
entry functions return 1 if it should trace, or 0 if the return should
not be traced.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-12-02 23:50:05 -05:00 • committed by Ingo Molnar
parent 7ee991fbc6
commit e49dc19c6a
7 changed files with 24 additions and 7 deletions
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2
include/linux/ftrace.h
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@ -371,7 +371,7 @@ struct ftrace_graph_ret {
#define FTRACE_RETSTACK_ALLOC_SIZE 32
/* Type of the callback handlers for tracing function graph*/
typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
typedef void (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
trace_func_graph_ent_t entryfunc);