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Date: Thu, 3 Sep 2015 17:28:47 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>, Wang Nan <wangnan0@...wei.com>,
Kaixu Xia <xiakaixu@...wei.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Daniel Borkmann <daniel@...earbox.net>,
linux-kernel@...r.kernel.org, He Kuang <hekuang@...wei.com>,
lizefan@...wei.com, Jiri Olsa <jolsa@...nel.org>,
David Ahern <dsahern@...il.com>,
Brendan Gregg <brendan.d.gregg@...il.com>, mingo@...nel.org,
ast@...mgrid.com
Subject: Re: [PATCH perf/core ] perf-probe: Output the result of
adding/deleting probe in buildin-probe
Em Thu, Sep 03, 2015 at 09:10:35PM +0900, Masami Hiramatsu escreveu:
> Output the normal result of adding/deleting probe in buildin-probe
> instead of showing it by add/del_perf_probe_events.
> All the result string is stored into "result" strbuf parameter.
> If you want to ignore the result string, pass a NULL to the "result".
> Note that all warning/debug strings are still in the
> add/del_perf_probe_events.
Please provide the before and after output of the affected tools.
But I'll wait for you to react to Namyung's RFC.
- Arnaldo
> Suggested-by: Namhyung Kim <namhyung@...il.com>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
> tools/perf/builtin-probe.c | 9 +++++++--
> tools/perf/util/probe-event.c | 33 ++++++++++++++++++++-------------
> tools/perf/util/probe-event.h | 6 ++++--
> tools/perf/util/probe-file.c | 5 +++--
> tools/perf/util/probe-file.h | 4 +++-
> 5 files changed, 37 insertions(+), 20 deletions(-)
>
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index b81cec3..d11ad21 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -402,6 +402,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
> "Enable kernel symbol demangling"),
> OPT_END()
> };
> + struct strbuf buf = STRBUF_INIT;
> int ret;
>
> set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
> @@ -483,7 +484,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
> return ret;
> #endif
> case 'd':
> - ret = del_perf_probe_events(params.filter);
> + ret = del_perf_probe_events(params.filter, &buf);
> + /* Even if failed, we should show the result first */
> + pr_info("%s", buf.buf);
> if (ret < 0) {
> pr_err_with_code(" Error: Failed to delete events.", ret);
> return ret;
> @@ -496,7 +499,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
> usage_with_options(probe_usage, options);
> }
>
> - ret = add_perf_probe_events(params.events, params.nevents);
> + ret = add_perf_probe_events(params.events, params.nevents, &buf);
> + /* Even if failed, we should show the result first */
> + pr_info("%s", buf.buf);
> if (ret < 0) {
> pr_err_with_code(" Error: Failed to add events.", ret);
> return ret;
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index eb5f18b..1a3ed7c 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -2395,7 +2395,8 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
>
> static int __add_probe_trace_events(struct perf_probe_event *pev,
> struct probe_trace_event *tevs,
> - int ntevs, bool allow_suffix)
> + int ntevs, bool allow_suffix,
> + struct strbuf *buf)
> {
> int i, fd, ret;
> struct probe_trace_event *tev = NULL;
> @@ -2415,7 +2416,9 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
> }
>
> ret = 0;
> - pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
> + if (buf)
> + strbuf_addf(buf, "Added new event%s\n",
> + (ntevs > 1) ? "s:" : ":");
> for (i = 0; i < ntevs; i++) {
> tev = &tevs[i];
> /* Skip if the symbol is out of .text or blacklisted */
> @@ -2432,9 +2435,12 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
> if (ret < 0)
> break;
>
> - /* We use tev's name for showing new events */
> - show_perf_probe_event(tev->group, tev->event, pev,
> - tev->point.module, false);
> + if (buf) {
> + /* We use tev's name for showing new events */
> + perf_probe_event__sprintf(tev->group, tev->event,
> + pev, tev->point.module, buf);
> + strbuf_addch(buf, '\n');
> + }
> /* Save the last valid name */
> event = tev->event;
> group = tev->group;
> @@ -2451,10 +2457,10 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
> warn_uprobe_event_compat(tev);
>
> /* Note that it is possible to skip all events because of blacklist */
> - if (ret >= 0 && event) {
> + if (ret >= 0 && event && buf) {
> /* Show how to use the event. */
> - pr_info("\nYou can now use it in all perf tools, such as:\n\n");
> - pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
> + strbuf_addf(buf, "\nYou can now use it in all perf tools, such as:\n\n");
> + strbuf_addf(buf, "\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
> }
>
> strlist__delete(namelist);
> @@ -2765,7 +2771,8 @@ struct __event_package {
> int ntevs;
> };
>
> -int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
> +int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
> + struct strbuf *result)
> {
> int i, j, ret;
> struct __event_package *pkgs;
> @@ -2802,7 +2809,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
> for (i = 0; i < npevs; i++) {
> ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
> pkgs[i].ntevs,
> - probe_conf.force_add);
> + probe_conf.force_add, result);
> if (ret < 0)
> break;
> }
> @@ -2819,7 +2826,7 @@ end:
> return ret;
> }
>
> -int del_perf_probe_events(struct strfilter *filter)
> +int del_perf_probe_events(struct strfilter *filter, struct strbuf *result)
> {
> int ret, ret2, ufd = -1, kfd = -1;
> char *str = strfilter__string(filter);
> @@ -2834,11 +2841,11 @@ int del_perf_probe_events(struct strfilter *filter)
> if (ret < 0)
> goto out;
>
> - ret = probe_file__del_events(kfd, filter);
> + ret = probe_file__del_events(kfd, filter, result);
> if (ret < 0 && ret != -ENOENT)
> goto error;
>
> - ret2 = probe_file__del_events(ufd, filter);
> + ret2 = probe_file__del_events(ufd, filter, result);
> if (ret2 < 0 && ret2 != -ENOENT) {
> ret = ret2;
> goto error;
> diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
> index 6e7ec68..9855dbf 100644
> --- a/tools/perf/util/probe-event.h
> +++ b/tools/perf/util/probe-event.h
> @@ -137,8 +137,10 @@ extern void line_range__clear(struct line_range *lr);
> /* Initialize line range */
> extern int line_range__init(struct line_range *lr);
>
> -extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs);
> -extern int del_perf_probe_events(struct strfilter *filter);
> +extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
> + struct strbuf *result);
> +extern int del_perf_probe_events(struct strfilter *filter,
> + struct strbuf *result);
> extern int show_perf_probe_events(struct strfilter *filter);
> extern int show_line_range(struct line_range *lr, const char *module,
> bool user);
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index bbb2437..e22fa12 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -267,7 +267,6 @@ static int __del_trace_probe_event(int fd, struct str_node *ent)
> goto error;
> }
>
> - pr_info("Removed event: %s\n", ent->s);
> return 0;
> error:
> pr_warning("Failed to delete event: %s\n",
> @@ -275,7 +274,7 @@ error:
> return ret;
> }
>
> -int probe_file__del_events(int fd, struct strfilter *filter)
> +int probe_file__del_events(int fd, struct strfilter *filter, struct strbuf *buf)
> {
> struct strlist *namelist;
> struct str_node *ent;
> @@ -293,6 +292,8 @@ int probe_file__del_events(int fd, struct strfilter *filter)
> ret = __del_trace_probe_event(fd, ent);
> if (ret < 0)
> break;
> + if (buf)
> + strbuf_addf(buf, "Removed event: %s\n", ent->s);
> }
> }
> strlist__delete(namelist);
> diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
> index ada94a2..ee89ef0 100644
> --- a/tools/perf/util/probe-file.h
> +++ b/tools/perf/util/probe-file.h
> @@ -1,6 +1,7 @@
> #ifndef __PROBE_FILE_H
> #define __PROBE_FILE_H
>
> +#include "strbuf.h"
> #include "strlist.h"
> #include "strfilter.h"
> #include "probe-event.h"
> @@ -13,6 +14,7 @@ int probe_file__open_both(int *kfd, int *ufd, int flag);
> struct strlist *probe_file__get_namelist(int fd);
> struct strlist *probe_file__get_rawlist(int fd);
> int probe_file__add_event(int fd, struct probe_trace_event *tev);
> -int probe_file__del_events(int fd, struct strfilter *filter);
> +int probe_file__del_events(int fd, struct strfilter *filter,
> + struct strbuf *buf);
>
> #endif
>
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