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tracing: Add a helper function for event print functions

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Move duplicate code in event print functions to a helper function.

This shrinks the size of the kernel by ~13K.

   text    data     bss     dec     hex filename
6596137 1743966 10138672        18478775        119f6b7 vmlinux.o.old
6583002 1743849 10138672        18465523        119c2f3 vmlinux.o.new

Link: http://lkml.kernel.org/r/51258746.2060304@huawei.com

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan 2013-02-21 10:32:38 +08:00 • committed by Steven Rostedt
parent 15693458c4
commit f71130de5c
3 changed files with 38 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
include/linux/ftrace_event.h
View file

@ -38,6 +38,12 @@ const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
const char *ftrace_print_hex_seq(struct trace_seq *p, const char *ftrace_print_hex_seq(struct trace_seq *p,
const unsigned char *buf, int len); const unsigned char *buf, int len);
struct trace_iterator;
struct trace_event;
int ftrace_raw_output_prep(struct trace_iterator *iter,
struct trace_event *event);
/* /*
* The trace entry - the most basic unit of tracing. This is what * The trace entry - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as: * is printed in the end as a single line in the trace output, such as:
@ -95,8 +101,6 @@ enum trace_iter_flags {
}; };
struct trace_event;
typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
int flags, struct trace_event *event); int flags, struct trace_event *event);

23
include/trace/ftrace.h
View file

@ -227,29 +227,18 @@ static notrace enum print_line_t \
ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \ ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
struct trace_event *trace_event) \ struct trace_event *trace_event) \
{ \ { \
struct ftrace_event_call *event; \
struct trace_seq *s = &iter->seq; \ struct trace_seq *s = &iter->seq; \
struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
struct ftrace_raw_##call *field; \ struct ftrace_raw_##call *field; \
struct trace_entry *entry; \
struct trace_seq *p = &iter->tmp_seq; \
int ret; \ int ret; \
\ \
event = container_of(trace_event, struct ftrace_event_call, \ field = (typeof(field))iter->ent; \
event); \
\ \
entry = iter->ent; \ ret = ftrace_raw_output_prep(iter, trace_event); \
\
if (entry->type != event->event.type) { \
WARN_ON_ONCE(1); \
return TRACE_TYPE_UNHANDLED; \
} \
\
field = (typeof(field))entry; \
\
trace_seq_init(p); \
ret = trace_seq_printf(s, "%s: ", event->name); \
if (ret) \ if (ret) \
ret = trace_seq_printf(s, print); \ return ret; \
\
ret = trace_seq_printf(s, print); \
if (!ret) \ if (!ret) \
return TRACE_TYPE_PARTIAL_LINE; \ return TRACE_TYPE_PARTIAL_LINE; \
\ \

26
kernel/trace/trace_output.c
View file

@ -397,6 +397,32 @@ ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
} }
EXPORT_SYMBOL(ftrace_print_hex_seq); EXPORT_SYMBOL(ftrace_print_hex_seq);
int ftrace_raw_output_prep(struct trace_iterator *iter,
struct trace_event *trace_event)
{
struct ftrace_event_call *event;
struct trace_seq *s = &iter->seq;
struct trace_seq *p = &iter->tmp_seq;
struct trace_entry *entry;
int ret;
event = container_of(trace_event, struct ftrace_event_call, event);
entry = iter->ent;
if (entry->type != event->event.type) {
WARN_ON_ONCE(1);
return TRACE_TYPE_UNHANDLED;
}
trace_seq_init(p);
ret = trace_seq_printf(s, "%s: ", event->name);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return 0;
}
EXPORT_SYMBOL(ftrace_raw_output_prep);
#ifdef CONFIG_KRETPROBES #ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name) static inline const char *kretprobed(const char *name)
{ {