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tracing: Kprobe-tracer supports more than 6 arguments

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Support up to 128 arguments to fetch for each kprobes event.

Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Avi Kivity <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Frank Ch. Eigler <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jason Baron <[email protected]>
Cc: Jim Keniston <[email protected]>
Cc: K.Prasad <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Przemysław Pawełczyk <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tom Zanussi <[email protected]>
Cc: Vegard Nossum <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
This commit is contained in:
Masami Hiramatsu 2009-08-13 16:35:18 -04:00 • committed by Frederic Weisbecker
commit a82378d880
2 changed files with 14 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

2
Documentation/trace/kprobetrace.txt
View file

@ -32,7 +32,7 @@ Synopsis of kprobe_events
SYMBOL[+offs|-offs] : Symbol+offset where the probe is inserted.
MEMADDR : Address where the probe is inserted.
FETCHARGS : Arguments.
FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG
sN : Fetch Nth entry of stack (N >= 0)
sa : Fetch stack address.

21
kernel/trace/trace_kprobe.c
View file

@ -32,7 +32,7 @@
#include "trace.h"
#include "trace_output.h"
#define TRACE_KPROBE_ARGS 6
#define MAX_TRACE_ARGS 128
#define MAX_ARGSTR_LEN 63
/* currently, trace_kprobe only supports X86. */
@ -184,11 +184,15 @@ struct trace_probe {
struct kretprobe rp;
};
const char *symbol; /* symbol name */
unsigned int nr_args;
struct fetch_func args[TRACE_KPROBE_ARGS];
struct ftrace_event_call call;
unsigned int nr_args;
struct fetch_func args[];
};
#define SIZEOF_TRACE_PROBE(n) \
(offsetof(struct trace_probe, args) + \
(sizeof(struct fetch_func) * (n)))
static int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_trace_func(struct kretprobe_instance *ri,
struct pt_regs *regs);
@ -263,11 +267,11 @@ static DEFINE_MUTEX(probe_lock);
static LIST_HEAD(probe_list);
static struct trace_probe *alloc_trace_probe(const char *symbol,
const char *event)
const char *event, int nargs)
{
struct trace_probe *tp;
tp = kzalloc(sizeof(struct trace_probe), GFP_KERNEL);
tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
if (!tp)
return ERR_PTR(-ENOMEM);
@ -573,9 +577,10 @@ static int create_trace_probe(int argc, char **argv)
if (offset && is_return)
return -EINVAL;
}
argc -= 2; argv += 2;
/* setup a probe */
tp = alloc_trace_probe(symbol, event);
tp = alloc_trace_probe(symbol, event, argc);
if (IS_ERR(tp))
return PTR_ERR(tp);
@ -594,8 +599,8 @@ static int create_trace_probe(int argc, char **argv)
kp->addr = addr;
/* parse arguments */
argc -= 2; argv += 2; ret = 0;
for (i = 0; i < argc && i < TRACE_KPROBE_ARGS; i++) {
ret = 0;
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
if (strlen(argv[i]) > MAX_ARGSTR_LEN) {
pr_info("Argument%d(%s) is too long.\n", i, argv[i]);
ret = -ENOSPC;