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authorSteven Rostedt <srostedt@redhat.com>2009-04-11 12:59:57 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-14 12:57:57 -0400
commit9504504cbab29ecb694186b1c5b15d3579c43c51 (patch)
treefd91bec634dfff191699616523812a3d4ffe6348 /kernel/trace
parenta8d154b009168337494fbf345671bab74d3e4b8b (diff)
tracing: make trace_seq operations available for core kernel
In the process to make TRACE_EVENT macro work for modules, the trace_seq operations must be available for core kernel code. These operations are quite useful and can be used for other implementations. The main idea is that we create a trace_seq handle that acts very much like the seq_file handle. struct trace_seq *s = kmalloc(sizeof(*s, GFP_KERNEL); trace_seq_init(s); trace_seq_printf(s, "some data %d\n", variable); printk("%s", s->buffer); The main use is to allow a top level function call several other functions that may store printf like data into the buffer. Then at the end, the top level function can process all the data with any method it would like to. It could be passed to userspace, output via printk or even use seq_file: trace_seq_to_user(s, ubuf, cnt); seq_puts(m, s->buffer); Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.h15
-rw-r--r--kernel/trace/trace_output.h16
2 files changed, 3 insertions, 28 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index b05b6ac982a..1882846b738 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -12,6 +12,8 @@
#include <linux/kmemtrace.h>
#include <trace/power.h>
+#include <linux/trace_seq.h>
+
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -423,19 +425,6 @@ struct tracer {
struct tracer_stat *stats;
};
-struct trace_seq {
- unsigned char buffer[PAGE_SIZE];
- unsigned int len;
- unsigned int readpos;
-};
-
-static inline void
-trace_seq_init(struct trace_seq *s)
-{
- s->len = 0;
- s->readpos = 0;
-}
-
#define TRACE_PIPE_ALL_CPU -1
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index 91630217fb4..5c7cbfb65c7 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -1,6 +1,7 @@
#ifndef __TRACE_EVENTS_H
#define __TRACE_EVENTS_H
+#include <linux/trace_seq.h>
#include "trace.h"
typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
@@ -20,24 +21,9 @@ trace_print_bprintk_msg_only(struct trace_iterator *iter);
extern enum print_line_t
trace_print_printk_msg_only(struct trace_iterator *iter);
-extern void trace_print_seq(struct seq_file *m, struct trace_seq *s);
-
-extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
- __attribute__ ((format (printf, 2, 3)));
-extern int
-trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
extern int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
unsigned long sym_flags);
-extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
- size_t cnt);
-extern int trace_seq_puts(struct trace_seq *s, const char *str);
-extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
-extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
-extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
- size_t len);
-extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
-extern int trace_seq_path(struct trace_seq *s, struct path *path);
extern int seq_print_userip_objs(const struct userstack_entry *entry,
struct trace_seq *s, unsigned long sym_flags);
extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,