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Date: Mon, 05 Aug 2013 15:46:12 +0900
From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Namhyung Kim <namhyung.kim@....com>,
Hyeoncheol Lee <cheol.lee@....com>,
LKML <linux-kernel@...r.kernel.org>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Oleg Nesterov <oleg@...hat.com>,
"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 07/13] tracing/kprobes: Remove duplicate set_print_fmt()
Remove? or Integrate? :)
(2013/07/31 18:03), Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@....com>
>
> The set_print_fmt() functions are implemented almost same for
> [ku]probes. Move it to a common place and get rid of the duplication.
Anyway this looks good for me;)
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Thanks!
>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> kernel/trace/trace_kprobe.c | 63 +--------------------------------------------
> kernel/trace/trace_probe.c | 62 ++++++++++++++++++++++++++++++++++++++++++++
> kernel/trace/trace_probe.h | 1 +
> kernel/trace/trace_uprobe.c | 55 +--------------------------------------
> 4 files changed, 65 insertions(+), 116 deletions(-)
>
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index d4c10fb8b8f8..40018618cc08 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1069,67 +1069,6 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
> return 0;
> }
>
> -static int __set_print_fmt(struct trace_kprobe *tp, char *buf, int len)
> -{
> - int i;
> - int pos = 0;
> -
> - const char *fmt, *arg;
> -
> - if (!trace_kprobe_is_return(tp)) {
> - fmt = "(%lx)";
> - arg = "REC->" FIELD_STRING_IP;
> - } else {
> - fmt = "(%lx <- %lx)";
> - arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
> - }
> -
> - /* When len=0, we just calculate the needed length */
> -#define LEN_OR_ZERO (len ? len - pos : 0)
> -
> - pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
> -
> - for (i = 0; i < tp->p.nr_args; i++) {
> - pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
> - tp->p.args[i].name, tp->p.args[i].type->fmt);
> - }
> -
> - pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
> -
> - for (i = 0; i < tp->p.nr_args; i++) {
> - if (strcmp(tp->p.args[i].type->name, "string") == 0)
> - pos += snprintf(buf + pos, LEN_OR_ZERO,
> - ", __get_str(%s)",
> - tp->p.args[i].name);
> - else
> - pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
> - tp->p.args[i].name);
> - }
> -
> -#undef LEN_OR_ZERO
> -
> - /* return the length of print_fmt */
> - return pos;
> -}
> -
> -static int set_print_fmt(struct trace_kprobe *tp)
> -{
> - int len;
> - char *print_fmt;
> -
> - /* First: called with 0 length to calculate the needed length */
> - len = __set_print_fmt(tp, NULL, 0);
> - print_fmt = kmalloc(len + 1, GFP_KERNEL);
> - if (!print_fmt)
> - return -ENOMEM;
> -
> - /* Second: actually write the @print_fmt */
> - __set_print_fmt(tp, print_fmt, len + 1);
> - tp->p.call.print_fmt = print_fmt;
> -
> - return 0;
> -}
> -
> #ifdef CONFIG_PERF_EVENTS
>
> /* Kprobe profile handler */
> @@ -1280,7 +1219,7 @@ static int register_probe_event(struct trace_kprobe *tp)
> call->event.funcs = &kprobe_funcs;
> call->class->define_fields = kprobe_event_define_fields;
> }
> - if (set_print_fmt(tp) < 0)
> + if (set_print_fmt(&tp->p, trace_kprobe_is_return(tp)) < 0)
> return -ENOMEM;
> ret = register_ftrace_event(&call->event);
> if (!ret) {
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index 5e491d82b6ad..76ab02143b5a 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -747,3 +747,65 @@ __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
> data + tp->args[i].offset);
> }
> }
> +
> +static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
> + bool is_return)
> +{
> + int i;
> + int pos = 0;
> +
> + const char *fmt, *arg;
> +
> + if (!is_return) {
> + fmt = "(%lx)";
> + arg = "REC->" FIELD_STRING_IP;
> + } else {
> + fmt = "(%lx <- %lx)";
> + arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
> + }
> +
> + /* When len=0, we just calculate the needed length */
> +#define LEN_OR_ZERO (len ? len - pos : 0)
> +
> + pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
> +
> + for (i = 0; i < tp->nr_args; i++) {
> + pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
> + tp->args[i].name, tp->args[i].type->fmt);
> + }
> +
> + pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
> +
> + for (i = 0; i < tp->nr_args; i++) {
> + if (strcmp(tp->args[i].type->name, "string") == 0)
> + pos += snprintf(buf + pos, LEN_OR_ZERO,
> + ", __get_str(%s)",
> + tp->args[i].name);
> + else
> + pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
> + tp->args[i].name);
> + }
> +
> +#undef LEN_OR_ZERO
> +
> + /* return the length of print_fmt */
> + return pos;
> +}
> +
> +int set_print_fmt(struct trace_probe *tp, bool is_return)
> +{
> + int len;
> + char *print_fmt;
> +
> + /* First: called with 0 length to calculate the needed length */
> + len = __set_print_fmt(tp, NULL, 0, is_return);
> + print_fmt = kmalloc(len + 1, GFP_KERNEL);
> + if (!print_fmt)
> + return -ENOMEM;
> +
> + /* Second: actually write the @print_fmt */
> + __set_print_fmt(tp, print_fmt, len + 1, is_return);
> + tp->call.print_fmt = print_fmt;
> +
> + return 0;
> +}
> diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
> index 888cd7d4cd3c..ec18e1b1487e 100644
> --- a/kernel/trace/trace_probe.h
> +++ b/kernel/trace/trace_probe.h
> @@ -301,3 +301,4 @@ extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));
> extern int __get_data_size(struct trace_probe *tp, struct pt_regs *regs);
> extern void store_trace_args(int ent_size, struct trace_probe *tp,
> struct pt_regs *regs, u8 *data, int maxlen);
> +extern int set_print_fmt(struct trace_probe *tp, bool is_return);
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index cbb2ad76fd8c..bcc7bd300c99 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -661,59 +661,6 @@ static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
> return 0;
> }
>
> -#define LEN_OR_ZERO (len ? len - pos : 0)
> -static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
> -{
> - const char *fmt, *arg;
> - int i;
> - int pos = 0;
> -
> - if (is_ret_probe(tu)) {
> - fmt = "(%lx <- %lx)";
> - arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
> - } else {
> - fmt = "(%lx)";
> - arg = "REC->" FIELD_STRING_IP;
> - }
> -
> - /* When len=0, we just calculate the needed length */
> -
> - pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
> -
> - for (i = 0; i < tu->p.nr_args; i++) {
> - pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
> - tu->p.args[i].name, tu->p.args[i].type->fmt);
> - }
> -
> - pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
> -
> - for (i = 0; i < tu->p.nr_args; i++) {
> - pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
> - tu->p.args[i].name);
> - }
> -
> - return pos; /* return the length of print_fmt */
> -}
> -#undef LEN_OR_ZERO
> -
> -static int set_print_fmt(struct trace_uprobe *tu)
> -{
> - char *print_fmt;
> - int len;
> -
> - /* First: called with 0 length to calculate the needed length */
> - len = __set_print_fmt(tu, NULL, 0);
> - print_fmt = kmalloc(len + 1, GFP_KERNEL);
> - if (!print_fmt)
> - return -ENOMEM;
> -
> - /* Second: actually write the @print_fmt */
> - __set_print_fmt(tu, print_fmt, len + 1);
> - tu->p.call.print_fmt = print_fmt;
> -
> - return 0;
> -}
> -
> #ifdef CONFIG_PERF_EVENTS
> static bool
> __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
> @@ -945,7 +892,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
> call->event.funcs = &uprobe_funcs;
> call->class->define_fields = uprobe_event_define_fields;
>
> - if (set_print_fmt(tu) < 0)
> + if (set_print_fmt(&tu->p, is_ret_probe(tu)) < 0)
> return -ENOMEM;
>
> ret = register_ftrace_event(&call->event);
>
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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