[PATCH perf/core 0/8] perf-probe: Add filtering features

[PATCH perf/core 0/8] perf-probe: Add filtering features

[Masami Hiramatsu]

Hi,

Here is a series of patches which improves perf-probe to add
filtering features for --list,--del and --funcs. This also
includes some bugfixes and cleanups.

E.g. --list/--funcs accepts filter rules.
  ----
  # ./perf probe -l vfs\*
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)
  # ./perf probe -l \*libc:\*
    probe_libc:malloc    (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17.so)
  ----
  ----
  # ./perf probe -F *kmalloc
  __kmalloc
  devm_kmalloc
  mempool_kmalloc
  sg_kmalloc
  sock_kmalloc
  ----

Also, --del accepts filter rules too which is more flexible than
simple wildcard.
  ----
  # ./perf probe -d 'vfs*|malloc'
  Removed event: probe:vfs_read
  Removed event: probe_libc:malloc
  ----

Thank you,


---

Masami Hiramatsu (8):
      [BUGFIX] perf probe: Make --funcs option exclusive
      [BUGFIX] perf probe: Remove all probes matches given pattern at once
      perf probe: Accept multiple filter options
      perf probe: Accept filter argument for --list
      perf probe: Allow to use filter on --del command
      perf probe: Accept filter argument for --funcs
      perf probe: Remove redundant cleanup of params.filter
      perf probe: Cleanup and consolidate command parsers


 tools/perf/Documentation/perf-probe.txt |   11 +-
 tools/perf/builtin-probe.c              |  162 +++++++++++++++----------------
 tools/perf/util/probe-event.c           |  113 +++++++++-------------
 tools/perf/util/probe-event.h           |    4 -
 tools/perf/util/strfilter.c             |  100 +++++++++++++++++++
 tools/perf/util/strfilter.h             |   22 ++++
 6 files changed, 258 insertions(+), 154 deletions(-)


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering 
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com

[PATCH perf/core 1/8] [BUGFIX] perf probe: Make --funcs option exclusive

[Masami Hiramatsu]

--funcs option is a command which should be given exclusively.
This adds PARSE_OPT_EXCUSIVE flag on --funcs (-F) option.

Without this, 'perf probe --funcs -l' just shows the list of
probes. With this, it shows error message correctly.

This also fixes the help message and the documentation.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/Documentation/perf-probe.txt |    2 ++
 tools/perf/builtin-probe.c              |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 239609c..a4a3cc7 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -19,6 +19,8 @@ or
 'perf probe' [options] --line='LINE'
 or
 'perf probe' [options] --vars='PROBEPOINT'
+or
+'perf probe' [options] --funcs
 
 DESCRIPTION
 -----------
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index f7b1af6..92dcce0 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -321,6 +321,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		"perf probe [<options>] --line 'LINEDESC'",
 		"perf probe [<options>] --vars 'PROBEPOINT'",
 #endif
+		"perf probe [<options>] --funcs",
 		NULL
 };
 	struct option options[] = {
@@ -402,6 +403,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
 	set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
 #endif
+	set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
 
 	argc = parse_options(argc, argv, options, probe_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);

[PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes matches given pattern at once

[Masami Hiramatsu]

Fix perf-probe --del option to delete all matched probes in both
of kprobes and uprobes at once.

When we have 2 or more events on different binaries as below,

  ----
  # ./perf probe -l
  probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)
  probe_libc:malloc    (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17
  ----

Trying to remove all event with '*' just removes kprobe events at first.
  ----
  # ./perf probe -d \*
  Removed event: probe:vfs_read
  ----

And in 2nd try, it removes all uprobe events.
  ----
  # ./perf probe -d \*
  Removed event: probe_libc:malloc
  ----

This fixes to remove all event at once as below.
  ----
  # ./perf probe -d \*
  Removed event: probe:vfs_read
  Removed event: probe_libc:malloc
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
---
 tools/perf/util/probe-event.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d8bb616..cae1fd7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2710,7 +2710,7 @@ static int del_trace_probe_event(int fd, const char *buf,
 
 int del_perf_probe_events(struct strlist *dellist)
 {
-	int ret = -1, ufd = -1, kfd = -1;
+	int ret = -1, ret2, ufd = -1, kfd = -1;
 	char buf[128];
 	const char *group, *event;
 	char *p, *str;
@@ -2731,8 +2731,10 @@ int del_perf_probe_events(struct strlist *dellist)
 		goto error;
 	}
 
-	if (namelist == NULL && unamelist == NULL)
+	if (namelist == NULL && unamelist == NULL) {
+		ret = -ENOENT;
 		goto error;
+	}
 
 	strlist__for_each(ent, dellist) {
 		str = strdup(ent->s);
@@ -2760,14 +2762,17 @@ int del_perf_probe_events(struct strlist *dellist)
 
 		pr_debug("Group: %s, Event: %s\n", group, event);
 
+		ret = ret2 = -ENOENT;
 		if (namelist)
 			ret = del_trace_probe_event(kfd, buf, namelist);
 
-		if (unamelist && ret != 0)
-			ret = del_trace_probe_event(ufd, buf, unamelist);
+		if (unamelist)
+			ret2 = del_trace_probe_event(ufd, buf, unamelist);
 
-		if (ret != 0)
-			pr_info("Info: Event \"%s\" does not exist.\n", buf);
+		/* Since we can remove probes which already removed, no error  */
+		if (ret != 0 && ret2 != 0)
+			pr_debug("Event \"%s\" does not exist.\n", buf);
+		ret = 0;
 
 		free(str);
 	}

[PATCH perf/core 3/8] perf probe: Accept multiple filter options

[Masami Hiramatsu]

Accept multiple filter options. Each filters are combined
by logical-or. E.g. --filter abc* --filter *def is same
as --filter abc*|*def

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/builtin-probe.c  |   14 +++++++++-----
 tools/perf/util/strfilter.c |   34 ++++++++++++++++++++++++++++++++++
 tools/perf/util/strfilter.h |   13 +++++++++++++
 3 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 92dcce0..be17075 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -262,21 +262,25 @@ static int opt_set_filter(const struct option *opt __maybe_unused,
 			  const char *str, int unset __maybe_unused)
 {
 	const char *err;
+	int ret = 0;
 
 	if (str) {
 		pr_debug2("Set filter: %s\n", str);
-		if (params.filter)
-			strfilter__delete(params.filter);
-		params.filter = strfilter__new(str, &err);
 		if (!params.filter) {
+			params.filter = strfilter__new(str, &err);
+			if (!params.filter)
+				ret = err ? -EINVAL : -ENOMEM;
+		} else
+			ret = strfilter__or(params.filter, str, &err);
+
+		if (ret == -EINVAL) {
 			pr_err("Filter parse error at %td.\n", err - str + 1);
 			pr_err("Source: \"%s\"\n", str);
 			pr_err("         %*c\n", (int)(err - str + 1), '^');
-			return -EINVAL;
 		}
 	}
 
-	return 0;
+	return ret;
 }
 
 static int init_params(void)
diff --git a/tools/perf/util/strfilter.c b/tools/perf/util/strfilter.c
index 79a757a..cd659e6 100644
--- a/tools/perf/util/strfilter.c
+++ b/tools/perf/util/strfilter.c
@@ -170,6 +170,40 @@ struct strfilter *strfilter__new(const char *rules, const char **err)
 	return filter;
 }
 
+static int strfilter__add(struct strfilter *filter, bool _or, const char *rules,
+			  const char **err)
+{
+	struct strfilter_node *right, *root;
+	const char *ep = NULL;
+
+	if (!filter || !rules)
+		return -EINVAL;
+
+	right = strfilter_node__new(rules, &ep);
+	if (!right || *ep != '\0') {
+		if (err)
+			*err = ep;
+		goto error;
+	}
+	root = strfilter_node__alloc(_or ? OP_or : OP_and, filter->root, right);
+	if (!root) {
+		ep = NULL;
+		goto error;
+	}
+
+	filter->root = root;
+	return 0;
+
+error:
+	strfilter_node__delete(right);
+	return ep ? -EINVAL : -ENOMEM;
+}
+
+int strfilter__or(struct strfilter *filter, const char *rules, const char **err)
+{
+	return strfilter__add(filter, true, rules, err);
+}
+
 static bool strfilter_node__compare(struct strfilter_node *node,
 				    const char *str)
 {
diff --git a/tools/perf/util/strfilter.h b/tools/perf/util/strfilter.h
index fe611f3..c81ff97 100644
--- a/tools/perf/util/strfilter.h
+++ b/tools/perf/util/strfilter.h
@@ -29,6 +29,19 @@ struct strfilter {
 struct strfilter *strfilter__new(const char *rules, const char **err);
 
 /**
+ * strfilter__or - Add an additional rule by logical-or
+ * @filter: Original string filter
+ * @rules: Filter rule to add at left of the root of @filter
+ *         by using logical-and.
+ * @err: Pointer which points an error detected on @rules
+ *
+ * Parse @rules and join it to the @filter by using logical-or.
+ * Return 0 if success, or return the error code.
+ */
+int strfilter__or(struct strfilter *filter,
+		  const char *rules, const char **err);
+
+/**
  * strfilter__compare - compare given string and a string filter
  * @filter: String filter
  * @str: target string

[PATCH perf/core 4/8] perf probe: Accept filter argument for --list

[Masami Hiramatsu]

Currently, perf-probe --list option ignores given event filter.
  ----
  # ./perf probe -l vfs\*
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)
    probe_libc:malloc    (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17.so)
  ----

This changes --list option to accept the event filter argument as below.
  ----
  # ./perf probe -l vfs\*
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)
  # ./perf probe -l \*libc:\*
    probe_libc:malloc    (on __libc_malloc@malloc/malloc.c in /usr/lib64/libc-2.17.so)
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/Documentation/perf-probe.txt |    6 +--
 tools/perf/builtin-probe.c              |   70 ++++++++++++++++++++-----------
 tools/perf/util/probe-event.c           |   27 ++++++++++--
 tools/perf/util/probe-event.h           |    2 -
 4 files changed, 73 insertions(+), 32 deletions(-)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index a4a3cc7..d0feb8e 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -14,7 +14,7 @@ or
 or
 'perf probe' [options] --del='[GROUP:]EVENT' [...]
 or
-'perf probe' --list
+'perf probe' --list[=[GROUP:]EVENT]
 or
 'perf probe' [options] --line='LINE'
 or
@@ -66,8 +66,8 @@ OPTIONS
 	classes(e.g. [a-z], [!A-Z]).
 
 -l::
---list::
-	List up current probe events.
+--list[=[GROUP:]EVENT]::
+	List up current probe events. This can also accept filtering patterns of event names.
 
 -L::
 --line=::
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index be17075..feca316 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -44,6 +44,7 @@
 
 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
 #define DEFAULT_FUNC_FILTER "!_*"
+#define DEFAULT_LIST_FILTER "*:*"
 
 /* Session management structure */
 static struct {
@@ -93,6 +94,28 @@ static int parse_probe_event(const char *str)
 	return ret;
 }
 
+static int params_add_filter(const char *str)
+{
+	const char *err = NULL;
+	int ret = 0;
+
+	pr_debug2("Add filter: %s\n", str);
+	if (!params.filter) {
+		params.filter = strfilter__new(str, &err);
+		if (!params.filter)
+			ret = err ? -EINVAL : -ENOMEM;
+	} else
+		ret = strfilter__or(params.filter, str, &err);
+
+	if (ret == -EINVAL) {
+		pr_err("Filter parse error at %td.\n", err - str + 1);
+		pr_err("Source: \"%s\"\n", str);
+		pr_err("         %*c\n", (int)(err - str + 1), '^');
+	}
+
+	return ret;
+}
+
 static int set_target(const char *ptr)
 {
 	int found = 0;
@@ -180,6 +203,18 @@ static int opt_del_probe_event(const struct option *opt __maybe_unused,
 	return 0;
 }
 
+static int opt_list_probe_event(const struct option *opt __maybe_unused,
+				const char *str, int unset)
+{
+	if (!unset)
+		params.list_events = true;
+
+	if (str)
+		return params_add_filter(str);
+
+	return 0;
+}
+
 static int opt_set_target(const struct option *opt, const char *str,
 			int unset __maybe_unused)
 {
@@ -261,26 +296,10 @@ static int opt_show_vars(const struct option *opt __maybe_unused,
 static int opt_set_filter(const struct option *opt __maybe_unused,
 			  const char *str, int unset __maybe_unused)
 {
-	const char *err;
-	int ret = 0;
+	if (str)
+		return params_add_filter(str);
 
-	if (str) {
-		pr_debug2("Set filter: %s\n", str);
-		if (!params.filter) {
-			params.filter = strfilter__new(str, &err);
-			if (!params.filter)
-				ret = err ? -EINVAL : -ENOMEM;
-		} else
-			ret = strfilter__or(params.filter, str, &err);
-
-		if (ret == -EINVAL) {
-			pr_err("Filter parse error at %td.\n", err - str + 1);
-			pr_err("Source: \"%s\"\n", str);
-			pr_err("         %*c\n", (int)(err - str + 1), '^');
-		}
-	}
-
-	return ret;
+	return 0;
 }
 
 static int init_params(void)
@@ -320,21 +339,22 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
 		"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
 		"perf probe [<options>] --del '[GROUP:]EVENT' ...",
-		"perf probe --list",
+		"perf probe --list [GROUP:]EVENT ...",
 #ifdef HAVE_DWARF_SUPPORT
 		"perf probe [<options>] --line 'LINEDESC'",
 		"perf probe [<options>] --vars 'PROBEPOINT'",
 #endif
 		"perf probe [<options>] --funcs",
 		NULL
-};
+	};
 	struct option options[] = {
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show parsed arguments, etc)"),
 	OPT_BOOLEAN('q', "quiet", &params.quiet,
 		    "be quiet (do not show any mesages)"),
-	OPT_BOOLEAN('l', "list", &params.list_events,
-		    "list up current probe events"),
+	OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
+			     "list up probe events", opt_list_probe_event,
+			     DEFAULT_LIST_FILTER),
 	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
 		opt_del_probe_event),
 	OPT_CALLBACK('a', "add", NULL,
@@ -448,7 +468,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 			pr_warning("  Error: Don't use --list with --exec.\n");
 			usage_with_options(probe_usage, options);
 		}
-		ret = show_perf_probe_events();
+		ret = show_perf_probe_events(params.filter);
+		strfilter__delete(params.filter);
+		params.filter = NULL;
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show event list.", ret);
 		return ret;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index cae1fd7..38bb282 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2129,7 +2129,23 @@ static int show_perf_probe_event(struct perf_probe_event *pev,
 	return ret;
 }
 
-static int __show_perf_probe_events(int fd, bool is_kprobe)
+static bool filter_probe_trace_event(struct probe_trace_event *tev,
+				     struct strfilter *filter)
+{
+	char tmp[128];
+
+	/* At first, check the event name itself */
+	if (strfilter__compare(filter, tev->event))
+		return true;
+
+	/* Next, check the combination of name and group */
+	if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0)
+		return false;
+	return strfilter__compare(filter, tmp);
+}
+
+static int __show_perf_probe_events(int fd, bool is_kprobe,
+				    struct strfilter *filter)
 {
 	int ret = 0;
 	struct probe_trace_event tev;
@@ -2147,12 +2163,15 @@ static int __show_perf_probe_events(int fd, bool is_kprobe)
 	strlist__for_each(ent, rawlist) {
 		ret = parse_probe_trace_command(ent->s, &tev);
 		if (ret >= 0) {
+			if (!filter_probe_trace_event(&tev, filter))
+				goto next;
 			ret = convert_to_perf_probe_event(&tev, &pev,
 								is_kprobe);
 			if (ret >= 0)
 				ret = show_perf_probe_event(&pev,
 							    tev.point.module);
 		}
+next:
 		clear_perf_probe_event(&pev);
 		clear_probe_trace_event(&tev);
 		if (ret < 0)
@@ -2164,7 +2183,7 @@ static int __show_perf_probe_events(int fd, bool is_kprobe)
 }
 
 /* List up current perf-probe events */
-int show_perf_probe_events(void)
+int show_perf_probe_events(struct strfilter *filter)
 {
 	int kp_fd, up_fd, ret;
 
@@ -2176,7 +2195,7 @@ int show_perf_probe_events(void)
 
 	kp_fd = open_kprobe_events(false);
 	if (kp_fd >= 0) {
-		ret = __show_perf_probe_events(kp_fd, true);
+		ret = __show_perf_probe_events(kp_fd, true, filter);
 		close(kp_fd);
 		if (ret < 0)
 			goto out;
@@ -2190,7 +2209,7 @@ int show_perf_probe_events(void)
 	}
 
 	if (up_fd >= 0) {
-		ret = __show_perf_probe_events(up_fd, false);
+		ret = __show_perf_probe_events(up_fd, false, filter);
 		close(up_fd);
 	}
 out:
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index d6b7834..819e825 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -127,7 +127,7 @@ extern const char *kernel_get_module_path(const char *module);
 extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
 				 int max_probe_points, bool force_add);
 extern int del_perf_probe_events(struct strlist *dellist);
-extern int show_perf_probe_events(void);
+extern int show_perf_probe_events(struct strfilter *filter);
 extern int show_line_range(struct line_range *lr, const char *module,
 			   bool user);
 extern int show_available_vars(struct perf_probe_event *pevs, int npevs,

[PATCH perf/core 5/8] perf probe: Allow to use filter on --del command

[Masami Hiramatsu]

This makes perf-probe --del option to accept filter rules
not only simple glob pattern. This simplifies the code and
improve the flexibility.

E.g. if we remove 2 different pattern events, we need 2
     -d options.
  ----
  # ./perf probe -d vfs\* -d malloc
  Removed event: probe_libc:malloc
  Removed event: probe:vfs_read
  ----

  This allows you to joint the 2 patterns with '|'.

  ----
  # ./perf probe -d 'vfs*|malloc'
  Removed event: probe:vfs_read
  Removed event: probe_libc:malloc
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/builtin-probe.c    |   16 +++----
 tools/perf/util/probe-event.c |   89 +++++++++++------------------------------
 tools/perf/util/probe-event.h |    2 -
 tools/perf/util/strfilter.c   |   66 ++++++++++++++++++++++++++++++
 tools/perf/util/strfilter.h   |    9 ++++
 5 files changed, 106 insertions(+), 76 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index feca316..1f41b4e 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -55,12 +55,12 @@ static struct {
 	bool show_ext_vars;
 	bool show_funcs;
 	bool mod_events;
+	bool del_events;
 	bool uprobes;
 	bool quiet;
 	bool target_used;
 	int nevents;
 	struct perf_probe_event events[MAX_PROBES];
-	struct strlist *dellist;
 	struct line_range line_range;
 	char *target;
 	int max_probe_points;
@@ -195,10 +195,8 @@ static int opt_del_probe_event(const struct option *opt __maybe_unused,
 			       const char *str, int unset __maybe_unused)
 {
 	if (str) {
-		params.mod_events = true;
-		if (!params.dellist)
-			params.dellist = strlist__new(true, NULL);
-		strlist__add(params.dellist, str);
+		params.del_events = true;
+		return params_add_filter(str);
 	}
 	return 0;
 }
@@ -313,8 +311,6 @@ static void cleanup_params(void)
 
 	for (i = 0; i < params.nevents; i++)
 		clear_perf_probe_event(params.events + i);
-	if (params.dellist)
-		strlist__delete(params.dellist);
 	line_range__clear(&params.line_range);
 	free(params.target);
 	if (params.filter)
@@ -454,7 +450,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (params.max_probe_points == 0)
 		params.max_probe_points = MAX_PROBES;
 
-	if ((!params.nevents && !params.dellist && !params.list_events &&
+	if ((!params.nevents && !params.del_events && !params.list_events &&
 	     !params.show_lines && !params.show_funcs))
 		usage_with_options(probe_usage, options);
 
@@ -514,8 +510,8 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	}
 #endif
 
-	if (params.dellist) {
-		ret = del_perf_probe_events(params.dellist);
+	if (params.del_events) {
+		ret = del_perf_probe_events(params.filter);
 		if (ret < 0) {
 			pr_err_with_code("  Error: Failed to delete events.", ret);
 			return ret;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 38bb282..2b08992 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2701,40 +2701,36 @@ error:
 	return ret;
 }
 
-static int del_trace_probe_event(int fd, const char *buf,
-						  struct strlist *namelist)
+static int del_trace_probe_events(int fd, struct strfilter *filter,
+				  struct strlist *namelist)
 {
-	struct str_node *ent, *n;
+	struct str_node *ent;
+	const char *p;
 	int ret = -1;
 
-	if (strpbrk(buf, "*?")) { /* Glob-exp */
-		strlist__for_each_safe(ent, n, namelist)
-			if (strglobmatch(ent->s, buf)) {
-				ret = __del_trace_probe_event(fd, ent);
-				if (ret < 0)
-					break;
-				strlist__remove(namelist, ent);
-			}
-	} else {
-		ent = strlist__find(namelist, buf);
-		if (ent) {
+	if (!namelist)
+		return -ENOENT;
+
+	strlist__for_each(ent, namelist) {
+		p = strchr(ent->s, ':');
+		if ((p && strfilter__compare(filter, p + 1)) ||
+		    strfilter__compare(filter, ent->s)) {
 			ret = __del_trace_probe_event(fd, ent);
-			if (ret >= 0)
-				strlist__remove(namelist, ent);
+			if (ret < 0)
+				break;
 		}
 	}
 
 	return ret;
 }
 
-int del_perf_probe_events(struct strlist *dellist)
+int del_perf_probe_events(struct strfilter *filter)
 {
-	int ret = -1, ret2, ufd = -1, kfd = -1;
-	char buf[128];
-	const char *group, *event;
-	char *p, *str;
-	struct str_node *ent;
+	int ret = 0, ufd = -1, kfd = -1;
 	struct strlist *namelist = NULL, *unamelist = NULL;
+	char *str = strfilter__string(filter);
+
+	pr_debug("Filter: \'%s\'\n", str);
 
 	/* Get current event names */
 	kfd = open_kprobe_events(true);
@@ -2747,53 +2743,15 @@ int del_perf_probe_events(struct strlist *dellist)
 
 	if (kfd < 0 && ufd < 0) {
 		print_both_open_warning(kfd, ufd);
+		ret = kfd;
 		goto error;
 	}
 
-	if (namelist == NULL && unamelist == NULL) {
-		ret = -ENOENT;
-		goto error;
-	}
-
-	strlist__for_each(ent, dellist) {
-		str = strdup(ent->s);
-		if (str == NULL) {
-			ret = -ENOMEM;
-			goto error;
-		}
-		pr_debug("Parsing: %s\n", str);
-		p = strchr(str, ':');
-		if (p) {
-			group = str;
-			*p = '\0';
-			event = p + 1;
-		} else {
-			group = "*";
-			event = str;
-		}
-
-		ret = e_snprintf(buf, 128, "%s:%s", group, event);
-		if (ret < 0) {
-			pr_err("Failed to copy event.");
-			free(str);
-			goto error;
-		}
-
-		pr_debug("Group: %s, Event: %s\n", group, event);
-
-		ret = ret2 = -ENOENT;
-		if (namelist)
-			ret = del_trace_probe_event(kfd, buf, namelist);
-
-		if (unamelist)
-			ret2 = del_trace_probe_event(ufd, buf, unamelist);
-
-		/* Since we can remove probes which already removed, no error  */
-		if (ret != 0 && ret2 != 0)
-			pr_debug("Event \"%s\" does not exist.\n", buf);
+	ret = del_trace_probe_events(kfd, filter, namelist);
+	if (del_trace_probe_events(ufd, filter, unamelist) < 0 && ret < 0) {
+		pr_debug("\"%s\" does not hit any event.\n", str);
+		/* Note that this is silently ignored */
 		ret = 0;
-
-		free(str);
 	}
 
 error:
@@ -2806,6 +2764,7 @@ error:
 		strlist__delete(unamelist);
 		close(ufd);
 	}
+	free(str);
 
 	return ret;
 }
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 819e825..027356f 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -126,7 +126,7 @@ extern const char *kernel_get_module_path(const char *module);
 
 extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
 				 int max_probe_points, bool force_add);
-extern int del_perf_probe_events(struct strlist *dellist);
+extern int del_perf_probe_events(struct strfilter *filter);
 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/strfilter.c b/tools/perf/util/strfilter.c
index cd659e6..9206618 100644
--- a/tools/perf/util/strfilter.c
+++ b/tools/perf/util/strfilter.c
@@ -231,3 +231,69 @@ bool strfilter__compare(struct strfilter *filter, const char *str)
 		return false;
 	return strfilter_node__compare(filter->root, str);
 }
+
+static int strfilter_node__sprint(struct strfilter_node *node, char *buf);
+
+/* sprint node in parenthesis if needed */
+static int strfilter_node__sprint_pt(struct strfilter_node *node, char *buf)
+{
+	int len;
+	int pt = node->r ? 2 : 0;	/* don't need to check node->l */
+
+	if (buf && pt)
+		*buf++ = '(';
+	len = strfilter_node__sprint(node, buf);
+	if (len < 0)
+		return len;
+	if (buf && pt)
+		*(buf + len) = ')';
+	return len + pt;
+}
+
+static int strfilter_node__sprint(struct strfilter_node *node, char *buf)
+{
+	int len = 0, rlen;
+
+	if (!node || !node->p)
+		return -EINVAL;
+
+	switch (*node->p) {
+	case '|':
+	case '&':
+		len = strfilter_node__sprint_pt(node->l, buf);
+		if (len < 0)
+			return len;
+	case '!':
+		if (buf) {
+			*(buf + len++) = *node->p;
+			buf += len;
+		} else
+			len++;
+		rlen = strfilter_node__sprint_pt(node->r, buf);
+		if (rlen < 0)
+			return rlen;
+		len += rlen;
+		break;
+	default:
+		len = strlen(node->p);
+		if (buf)
+			strcpy(buf, node->p);
+	}
+
+	return len;
+}
+
+char *strfilter__string(struct strfilter *filter)
+{
+	int len;
+	char *ret = NULL;
+
+	len = strfilter_node__sprint(filter->root, NULL);
+	if (len < 0)
+		return NULL;
+
+	ret = malloc(len + 1);
+	strfilter_node__sprint(filter->root, ret);
+
+	return ret;
+}
diff --git a/tools/perf/util/strfilter.h b/tools/perf/util/strfilter.h
index c81ff97..d0b772c 100644
--- a/tools/perf/util/strfilter.h
+++ b/tools/perf/util/strfilter.h
@@ -58,4 +58,13 @@ bool strfilter__compare(struct strfilter *filter, const char *str);
  */
 void strfilter__delete(struct strfilter *filter);
 
+/**
+ * strfilter__string - Reconstruct a rule string from filter
+ * @filter: String filter to reconstruct
+ *
+ * Reconstruct a rule string from @filter. This will be good for
+ * debug messages. Note that returning string must be freed afterward.
+ */
+char *strfilter__string(struct strfilter *filter);
+
 #endif

[PATCH perf/core 6/8] perf probe: Accept filter argument for --funcs

[Masami Hiramatsu]

This allows user to pass the filter pattern directly to
--funcs option as below.
  ----
  # ./perf probe -F *kmalloc
  __kmalloc
  devm_kmalloc
  mempool_kmalloc
  sg_kmalloc
  sock_kmalloc
  ----

We previously need --filter option for that.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/Documentation/perf-probe.txt |    3 ++-
 tools/perf/builtin-probe.c              |   19 ++++++++++++++-----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index d0feb8e..a272f2e 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -84,9 +84,10 @@ OPTIONS
 	variables.
 
 -F::
---funcs::
+--funcs[=FILTER]::
 	Show available functions in given module or kernel. With -x/--exec,
 	can also list functions in a user space executable / shared library.
+	This also can accept a FILTER rule argument.
 
 --filter=FILTER::
 	(Only for --vars and --funcs) Set filter. FILTER is a combination of glob
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 1f41b4e..5a0e8f1 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -290,6 +290,17 @@ static int opt_show_vars(const struct option *opt __maybe_unused,
 	return ret;
 }
 #endif
+static int opt_show_funcs(const struct option *opt __maybe_unused,
+			  const char *str, int unset)
+{
+	if (!unset)
+		params.show_funcs = true;
+
+	if (str)
+		return params_add_filter(str);
+
+	return 0;
+}
 
 static int opt_set_filter(const struct option *opt __maybe_unused,
 			  const char *str, int unset __maybe_unused)
@@ -399,8 +410,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT__DRY_RUN(&probe_event_dry_run),
 	OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
 		 "Set how many probe points can be found for a probe."),
-	OPT_BOOLEAN('F', "funcs", &params.show_funcs,
-		    "Show potential probe-able functions."),
+	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
+			     "Show potential probe-able functions.",
+			     opt_show_funcs, DEFAULT_FUNC_FILTER),
 	OPT_CALLBACK('\0', "filter", NULL,
 		     "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
 		     "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
@@ -472,9 +484,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		return ret;
 	}
 	if (params.show_funcs) {
-		if (!params.filter)
-			params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
-						       NULL);
 		ret = show_available_funcs(params.target, params.filter,
 					params.uprobes);
 		strfilter__delete(params.filter);

[PATCH perf/core 7/8] perf probe: Remove redundant cleanup of params.filter

[Masami Hiramatsu]

Since params.filter will be released in cleanup_params,
we don't need to clear it in each command.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/builtin-probe.c |    6 ------
 1 file changed, 6 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 5a0e8f1..08c9481 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -477,8 +477,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 			usage_with_options(probe_usage, options);
 		}
 		ret = show_perf_probe_events(params.filter);
-		strfilter__delete(params.filter);
-		params.filter = NULL;
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show event list.", ret);
 		return ret;
@@ -486,8 +484,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (params.show_funcs) {
 		ret = show_available_funcs(params.target, params.filter,
 					params.uprobes);
-		strfilter__delete(params.filter);
-		params.filter = NULL;
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show functions.", ret);
 		return ret;
@@ -511,8 +507,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 					  params.target,
 					  params.filter,
 					  params.show_ext_vars);
-		strfilter__delete(params.filter);
-		params.filter = NULL;
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show vars.", ret);
 		return ret;

[PATCH perf/core 8/8] perf probe: Cleanup and consolidate command parsers

[Masami Hiramatsu]

To simplify the perf-probe command code, consolidate some
similar functions and use command short-name for command
classification, instead of separated booleans.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
 tools/perf/builtin-probe.c |  105 ++++++++++++++++----------------------------
 1 file changed, 37 insertions(+), 68 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 08c9481..17870b8 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -48,14 +48,10 @@
 
 /* Session management structure */
 static struct {
+	int command;	/* Command short_name */
 	bool list_events;
 	bool force_add;
-	bool show_lines;
-	bool show_vars;
 	bool show_ext_vars;
-	bool show_funcs;
-	bool mod_events;
-	bool del_events;
 	bool uprobes;
 	bool quiet;
 	bool target_used;
@@ -175,44 +171,11 @@ static int parse_probe_event_argv(int argc, const char **argv)
 
 		len += sprintf(&buf[len], "%s ", argv[i]);
 	}
-	params.mod_events = true;
 	ret = parse_probe_event(buf);
 	free(buf);
 	return ret;
 }
 
-static int opt_add_probe_event(const struct option *opt __maybe_unused,
-			      const char *str, int unset __maybe_unused)
-{
-	if (str) {
-		params.mod_events = true;
-		return parse_probe_event(str);
-	} else
-		return 0;
-}
-
-static int opt_del_probe_event(const struct option *opt __maybe_unused,
-			       const char *str, int unset __maybe_unused)
-{
-	if (str) {
-		params.del_events = true;
-		return params_add_filter(str);
-	}
-	return 0;
-}
-
-static int opt_list_probe_event(const struct option *opt __maybe_unused,
-				const char *str, int unset)
-{
-	if (!unset)
-		params.list_events = true;
-
-	if (str)
-		return params_add_filter(str);
-
-	return 0;
-}
-
 static int opt_set_target(const struct option *opt, const char *str,
 			int unset __maybe_unused)
 {
@@ -250,8 +213,10 @@ static int opt_set_target(const struct option *opt, const char *str,
 	return ret;
 }
 
+/* Command option callbacks */
+
 #ifdef HAVE_DWARF_SUPPORT
-static int opt_show_lines(const struct option *opt __maybe_unused,
+static int opt_show_lines(const struct option *opt,
 			  const char *str, int unset __maybe_unused)
 {
 	int ret = 0;
@@ -259,19 +224,19 @@ static int opt_show_lines(const struct option *opt __maybe_unused,
 	if (!str)
 		return 0;
 
-	if (params.show_lines) {
+	if (params.command == 'L') {
 		pr_warning("Warning: more than one --line options are"
 			   " detected. Only the first one is valid.\n");
 		return 0;
 	}
 
-	params.show_lines = true;
+	params.command = opt->short_name;
 	ret = parse_line_range_desc(str, &params.line_range);
 
 	return ret;
 }
 
-static int opt_show_vars(const struct option *opt __maybe_unused,
+static int opt_show_vars(const struct option *opt,
 			 const char *str, int unset __maybe_unused)
 {
 	struct perf_probe_event *pev = &params.events[params.nevents];
@@ -285,16 +250,27 @@ static int opt_show_vars(const struct option *opt __maybe_unused,
 		pr_err("  Error: '--vars' doesn't accept arguments.\n");
 		return -EINVAL;
 	}
-	params.show_vars = true;
+	params.command = opt->short_name;
 
 	return ret;
 }
 #endif
-static int opt_show_funcs(const struct option *opt __maybe_unused,
-			  const char *str, int unset)
+static int opt_add_probe_event(const struct option *opt,
+			      const char *str, int unset __maybe_unused)
+{
+	if (str) {
+		params.command = opt->short_name;
+		return parse_probe_event(str);
+	}
+
+	return 0;
+}
+
+static int opt_set_filter_with_command(const struct option *opt,
+				       const char *str, int unset)
 {
 	if (!unset)
-		params.show_funcs = true;
+		params.command = opt->short_name;
 
 	if (str)
 		return params_add_filter(str);
@@ -360,10 +336,10 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN('q', "quiet", &params.quiet,
 		    "be quiet (do not show any mesages)"),
 	OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
-			     "list up probe events", opt_list_probe_event,
-			     DEFAULT_LIST_FILTER),
+			     "list up probe events",
+			     opt_set_filter_with_command, DEFAULT_LIST_FILTER),
 	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
-		opt_del_probe_event),
+		     opt_set_filter_with_command),
 	OPT_CALLBACK('a', "add", NULL,
 #ifdef HAVE_DWARF_SUPPORT
 		"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
@@ -412,7 +388,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		 "Set how many probe points can be found for a probe."),
 	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
 			     "Show potential probe-able functions.",
-			     opt_show_funcs, DEFAULT_FUNC_FILTER),
+			     opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
 	OPT_CALLBACK('\0', "filter", NULL,
 		     "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
 		     "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
@@ -462,16 +438,13 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (params.max_probe_points == 0)
 		params.max_probe_points = MAX_PROBES;
 
-	if ((!params.nevents && !params.del_events && !params.list_events &&
-	     !params.show_lines && !params.show_funcs))
-		usage_with_options(probe_usage, options);
-
 	/*
 	 * Only consider the user's kernel image path if given.
 	 */
 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
 
-	if (params.list_events) {
+	switch (params.command) {
+	case 'l':
 		if (params.uprobes) {
 			pr_warning("  Error: Don't use --list with --exec.\n");
 			usage_with_options(probe_usage, options);
@@ -480,24 +453,20 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show event list.", ret);
 		return ret;
-	}
-	if (params.show_funcs) {
+	case 'F':
 		ret = show_available_funcs(params.target, params.filter,
 					params.uprobes);
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show functions.", ret);
 		return ret;
-	}
-
 #ifdef HAVE_DWARF_SUPPORT
-	if (params.show_lines) {
+	case 'L':
 		ret = show_line_range(&params.line_range, params.target,
 				      params.uprobes);
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show lines.", ret);
 		return ret;
-	}
-	if (params.show_vars) {
+	case 'V':
 		if (!params.filter)
 			params.filter = strfilter__new(DEFAULT_VAR_FILTER,
 						       NULL);
@@ -510,18 +479,15 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show vars.", ret);
 		return ret;
-	}
 #endif
-
-	if (params.del_events) {
+	case 'd':
 		ret = del_perf_probe_events(params.filter);
 		if (ret < 0) {
 			pr_err_with_code("  Error: Failed to delete events.", ret);
 			return ret;
 		}
-	}
-
-	if (params.nevents) {
+		break;
+	case 'a':
 		/* Ensure the last given target is used */
 		if (params.target && !params.target_used) {
 			pr_warning("  Error: -x/-m must follow the probe definitions.\n");
@@ -535,6 +501,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 			pr_err_with_code("  Error: Failed to add events.", ret);
 			return ret;
 		}
+		break;
+	default:
+		usage_with_options(probe_usage, options);
 	}
 	return 0;
 }

Re: [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes matches given pattern at once

[Namhyung Kim]

Hi Masami,

On Tue, Apr 21, 2015 at 08:42:00PM +0900, Masami Hiramatsu wrote:
> @@ -2760,14 +2762,17 @@ int del_perf_probe_events(struct strlist *dellist)
>  
>  		pr_debug("Group: %s, Event: %s\n", group, event);
>  
> +		ret = ret2 = -ENOENT;
>  		if (namelist)
>  			ret = del_trace_probe_event(kfd, buf, namelist);
>  
> -		if (unamelist && ret != 0)
> -			ret = del_trace_probe_event(ufd, buf, unamelist);
> +		if (unamelist)
> +			ret2 = del_trace_probe_event(ufd, buf, unamelist);
>  
> -		if (ret != 0)
> -			pr_info("Info: Event \"%s\" does not exist.\n", buf);
> +		/* Since we can remove probes which already removed, no error  */
> +		if (ret != 0 && ret2 != 0)
> +			pr_debug("Event \"%s\" does not exist.\n", buf);

I think it'd be better checking 'ret == -ENOENT && ret2 == -ENOENT'
here since del_trace_probe_event() can return other error codes.

Thanks,
Namhyung


> +		ret = 0;
>  
>  		free(str);
>  	}
> 

Re: [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes matches given pattern at once

[Masami Hiramatsu]

(2015/04/22 16:33), Namhyung Kim wrote:
> Hi Masami,
> 
> On Tue, Apr 21, 2015 at 08:42:00PM +0900, Masami Hiramatsu wrote:
>> @@ -2760,14 +2762,17 @@ int del_perf_probe_events(struct strlist *dellist)
>>  
>>  		pr_debug("Group: %s, Event: %s\n", group, event);
>>  
>> +		ret = ret2 = -ENOENT;
>>  		if (namelist)
>>  			ret = del_trace_probe_event(kfd, buf, namelist);
>>  
>> -		if (unamelist && ret != 0)
>> -			ret = del_trace_probe_event(ufd, buf, unamelist);
>> +		if (unamelist)
>> +			ret2 = del_trace_probe_event(ufd, buf, unamelist);
>>  
>> -		if (ret != 0)
>> -			pr_info("Info: Event \"%s\" does not exist.\n", buf);
>> +		/* Since we can remove probes which already removed, no error  */
>> +		if (ret != 0 && ret2 != 0)
>> +			pr_debug("Event \"%s\" does not exist.\n", buf);
> 
> I think it'd be better checking 'ret == -ENOENT && ret2 == -ENOENT'
> here since del_trace_probe_event() can return other error codes.

Indeed. BTW, this code is replaced by patch 5/8, so I'll update it too.

Thanks!


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com

Re: [PATCH perf/core 5/8] perf probe: Allow to use filter on --del command

[Namhyung Kim]

On Tue, Apr 21, 2015 at 08:42:06PM +0900, Masami Hiramatsu wrote:
> -int del_perf_probe_events(struct strlist *dellist)
> +int del_perf_probe_events(struct strfilter *filter)
>  {
> -	int ret = -1, ret2, ufd = -1, kfd = -1;
> -	char buf[128];
> -	const char *group, *event;
> -	char *p, *str;
> -	struct str_node *ent;
> +	int ret = 0, ufd = -1, kfd = -1;
>  	struct strlist *namelist = NULL, *unamelist = NULL;
> +	char *str = strfilter__string(filter);

You may want to check the return value here - or in the
strfilter__string() ?

Thanks,
Namhyung


> +
> +	pr_debug("Filter: \'%s\'\n", str);

[SNIP]
> +char *strfilter__string(struct strfilter *filter)
> +{
> +	int len;
> +	char *ret = NULL;
> +
> +	len = strfilter_node__sprint(filter->root, NULL);
> +	if (len < 0)
> +		return NULL;
> +
> +	ret = malloc(len + 1);

Here?

> +	strfilter_node__sprint(filter->root, ret);
> +
> +	return ret;
> +}

Re: Re: [PATCH perf/core 5/8] perf probe: Allow to use filter on --del command

[Masami Hiramatsu]

(2015/04/22 22:56), Namhyung Kim wrote:
> On Tue, Apr 21, 2015 at 08:42:06PM +0900, Masami Hiramatsu wrote:
>> -int del_perf_probe_events(struct strlist *dellist)
>> +int del_perf_probe_events(struct strfilter *filter)
>>  {
>> -	int ret = -1, ret2, ufd = -1, kfd = -1;
>> -	char buf[128];
>> -	const char *group, *event;
>> -	char *p, *str;
>> -	struct str_node *ent;
>> +	int ret = 0, ufd = -1, kfd = -1;
>>  	struct strlist *namelist = NULL, *unamelist = NULL;
>> +	char *str = strfilter__string(filter);
> 
> You may want to check the return value here - or in the
> strfilter__string() ?

Ah, right. Even though this str is only for debugging, it
is better to verify the filter is correctly built by
strfilter__string.

I'll check the return value here.

> 
> Thanks,
> Namhyung
> 
> 
>> +
>> +	pr_debug("Filter: \'%s\'\n", str);
> 
> [SNIP]
>> +char *strfilter__string(struct strfilter *filter)
>> +{
>> +	int len;
>> +	char *ret = NULL;
>> +
>> +	len = strfilter_node__sprint(filter->root, NULL);
>> +	if (len < 0)
>> +		return NULL;
>> +
>> +	ret = malloc(len + 1);
> 
> Here?

Oops, of course there need another check :)
this is just a simple care-less miss.

Thanks again!

> 
>> +	strfilter_node__sprint(filter->root, ret);
>> +
>> +	return ret;
>> +}
> --
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-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com