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tracing: infrastructure for supporting binary record

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Impact: save on memory for tracing

Current tracers are typically using a struct(like struct ftrace_entry,
struct ctx_switch_entry, struct special_entr etc...)to record a binary
event. These structs can only record a their own kind of events.
A new kind of tracer need a new struct and a lot of code too handle it.

So we need a generic binary record for events. This infrastructure
is for this purpose.

[fweisbec@gmail.com: rebase against latest -tip, make it safe while sched
tracing as reported by Steven Rostedt]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1236356510-8381-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Lai Jiangshan
2009-03-06 17:21:47 +01:00
committed by Ingo Molnar
parent 546e5354a6
commit 1427cdf059
7 changed files with 240 additions and 0 deletions
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12
kernel/trace/trace.h
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@@ -20,6 +20,7 @@ enum trace_type {
TRACE_WAKE,
TRACE_STACK,
TRACE_PRINT,
TRACE_BPRINTK,
TRACE_SPECIAL,
TRACE_MMIO_RW,
TRACE_MMIO_MAP,
@@ -124,6 +125,16 @@ struct print_entry {
char buf[];
};
struct bprintk_entry {
struct trace_entry ent;
unsigned long ip;
const char *fmt;
u32 buf[];
};
#ifdef CONFIG_TRACE_BPRINTK
extern int trace_bprintk_enable;
#endif
#define TRACE_OLD_SIZE 88
struct trace_field_cont {
@@ -285,6 +296,7 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
IF_ASSIGN(var, ent, struct bprintk_entry, TRACE_BPRINTK);\
IF_ASSIGN(var, ent, struct special_entry, 0); \
IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
TRACE_MMIO_RW); \