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authorMasami Hiramatsu <mhiramat@redhat.com>2009-11-30 19:20:17 -0500
committerIngo Molnar <mingo@elte.hu>2009-12-01 08:20:02 +0100
commit4de189fe6e5ad8241f6f8709d2e2ba4c3aeae33a (patch)
treeba4d4d6771df1a7d92bd7f8d0c2bce6369e67124 /tools/perf/util/probe-event.c
parente1c01d61a98703fcc80d15b8068ec36d5a215f7e (diff)
perf probe: Add --list option for listing current probe events
Add --list option for listing currently defined probe events in the kernel. This shows events in below format; [group:event] <perf-probe probe-definition> for example: [probe:schedule_0] schedule+30 cpu Note that source file/line information is not supported yet. So even if you added a probe by line, it will be shown in <symbol+offset>. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091201002017.10235.76575.stgit@harusame> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/probe-event.c')
-rw-r--r--tools/perf/util/probe-event.c231
1 files changed, 214 insertions, 17 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index e3a683ab976..7f4f288c642 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -29,10 +29,13 @@
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
+#include <stdarg.h>
+#include <limits.h>
#undef _GNU_SOURCE
#include "event.h"
#include "string.h"
+#include "strlist.h"
#include "debug.h"
#include "parse-events.h" /* For debugfs_path */
#include "probe-event.h"
@@ -43,6 +46,19 @@
#define semantic_error(msg ...) die("Semantic error :" msg)
+/* If there is no space to write, returns -E2BIG. */
+static int e_snprintf(char *str, size_t size, const char *format, ...)
+{
+ int ret;
+ va_list ap;
+ va_start(ap, format);
+ ret = vsnprintf(str, size, format, ap);
+ va_end(ap);
+ if (ret >= (int)size)
+ ret = -E2BIG;
+ return ret;
+}
+
/* Parse probepoint definition. */
static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
{
@@ -166,6 +182,103 @@ int parse_perf_probe_event(const char *str, struct probe_point *pp)
return need_dwarf;
}
+/* Parse kprobe_events event into struct probe_point */
+void parse_trace_kprobe_event(const char *str, char **group, char **event,
+ struct probe_point *pp)
+{
+ char pr;
+ char *p;
+ int ret, i, argc;
+ char **argv;
+
+ pr_debug("Parsing kprobe_events: %s\n", str);
+ argv = argv_split(str, &argc);
+ if (!argv)
+ die("argv_split failed.");
+ if (argc < 2)
+ semantic_error("Too less arguments.");
+
+ /* Scan event and group name. */
+ ret = sscanf(argv[0], "%c:%m[^/ \t]/%m[^ \t]",
+ &pr, group, event);
+ if (ret != 3)
+ semantic_error("Failed to parse event name: %s", argv[0]);
+ pr_debug("Group:%s Event:%s probe:%c\n", *group, *event, pr);
+
+ if (!pp)
+ goto end;
+
+ pp->retprobe = (pr == 'r');
+
+ /* Scan function name and offset */
+ ret = sscanf(argv[1], "%m[^+]+%d", &pp->function, &pp->offset);
+ if (ret == 1)
+ pp->offset = 0;
+
+ /* kprobe_events doesn't have this information */
+ pp->line = 0;
+ pp->file = NULL;
+
+ pp->nr_args = argc - 2;
+ pp->args = zalloc(sizeof(char *) * pp->nr_args);
+ for (i = 0; i < pp->nr_args; i++) {
+ p = strchr(argv[i + 2], '=');
+ if (p) /* We don't need which register is assigned. */
+ *p = '\0';
+ pp->args[i] = strdup(argv[i + 2]);
+ if (!pp->args[i])
+ die("Failed to copy argument.");
+ }
+
+end:
+ argv_free(argv);
+}
+
+int synthesize_perf_probe_event(struct probe_point *pp)
+{
+ char *buf;
+ char offs[64] = "", line[64] = "";
+ int i, len, ret;
+
+ pp->probes[0] = buf = zalloc(MAX_CMDLEN);
+ if (!buf)
+ die("Failed to allocate memory by zalloc.");
+ if (pp->offset) {
+ ret = e_snprintf(offs, 64, "+%d", pp->offset);
+ if (ret <= 0)
+ goto error;
+ }
+ if (pp->line) {
+ ret = e_snprintf(line, 64, ":%d", pp->line);
+ if (ret <= 0)
+ goto error;
+ }
+
+ if (pp->function)
+ ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function,
+ offs, pp->retprobe ? "%return" : "", line);
+ else
+ ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->file, line);
+ if (ret <= 0)
+ goto error;
+ len = ret;
+
+ for (i = 0; i < pp->nr_args; i++) {
+ ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
+ pp->args[i]);
+ if (ret <= 0)
+ goto error;
+ len += ret;
+ }
+ pp->found = 1;
+
+ return pp->found;
+error:
+ free(pp->probes[0]);
+
+ return ret;
+}
+
int synthesize_trace_kprobe_event(struct probe_point *pp)
{
char *buf;
@@ -174,15 +287,15 @@ int synthesize_trace_kprobe_event(struct probe_point *pp)
pp->probes[0] = buf = zalloc(MAX_CMDLEN);
if (!buf)
die("Failed to allocate memory by zalloc.");
- ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
- if (ret <= 0 || ret >= MAX_CMDLEN)
+ ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
+ if (ret <= 0)
goto error;
len = ret;
for (i = 0; i < pp->nr_args; i++) {
- ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
- pp->args[i]);
- if (ret <= 0 || ret >= MAX_CMDLEN - len)
+ ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
+ pp->args[i]);
+ if (ret <= 0)
goto error;
len += ret;
}
@@ -191,12 +304,105 @@ int synthesize_trace_kprobe_event(struct probe_point *pp)
return pp->found;
error:
free(pp->probes[0]);
- if (ret > 0)
- ret = -E2BIG;
return ret;
}
+static int open_kprobe_events(int flags, int mode)
+{
+ char buf[PATH_MAX];
+ int ret;
+
+ ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path);
+ if (ret < 0)
+ die("Failed to make kprobe_events path.");
+
+ ret = open(buf, flags, mode);
+ if (ret < 0) {
+ if (errno == ENOENT)
+ die("kprobe_events file does not exist -"
+ " please rebuild with CONFIG_KPROBE_TRACER.");
+ else
+ die("Could not open kprobe_events file: %s",
+ strerror(errno));
+ }
+ return ret;
+}
+
+/* Get raw string list of current kprobe_events */
+static struct strlist *get_trace_kprobe_event_rawlist(int fd)
+{
+ int ret, idx;
+ FILE *fp;
+ char buf[MAX_CMDLEN];
+ char *p;
+ struct strlist *sl;
+
+ sl = strlist__new(true, NULL);
+
+ fp = fdopen(dup(fd), "r");
+ while (!feof(fp)) {
+ p = fgets(buf, MAX_CMDLEN, fp);
+ if (!p)
+ break;
+
+ idx = strlen(p) - 1;
+ if (p[idx] == '\n')
+ p[idx] = '\0';
+ ret = strlist__add(sl, buf);
+ if (ret < 0)
+ die("strlist__add failed: %s", strerror(-ret));
+ }
+ fclose(fp);
+
+ return sl;
+}
+
+/* Free and zero clear probe_point */
+static void clear_probe_point(struct probe_point *pp)
+{
+ int i;
+
+ if (pp->function)
+ free(pp->function);
+ if (pp->file)
+ free(pp->file);
+ for (i = 0; i < pp->nr_args; i++)
+ free(pp->args[i]);
+ if (pp->args)
+ free(pp->args);
+ for (i = 0; i < pp->found; i++)
+ free(pp->probes[i]);
+ memset(pp, 0, sizeof(pp));
+}
+
+/* List up current perf-probe events */
+void show_perf_probe_events(void)
+{
+ unsigned int i;
+ int fd;
+ char *group, *event;
+ struct probe_point pp;
+ struct strlist *rawlist;
+ struct str_node *ent;
+
+ fd = open_kprobe_events(O_RDONLY, 0);
+ rawlist = get_trace_kprobe_event_rawlist(fd);
+ close(fd);
+
+ for (i = 0; i < strlist__nr_entries(rawlist); i++) {
+ ent = strlist__entry(rawlist, i);
+ parse_trace_kprobe_event(ent->s, &group, &event, &pp);
+ synthesize_perf_probe_event(&pp);
+ printf("[%s:%s]\t%s\n", group, event, pp.probes[0]);
+ free(group);
+ free(event);
+ clear_probe_point(&pp);
+ }
+
+ strlist__delete(rawlist);
+}
+
static int write_trace_kprobe_event(int fd, const char *buf)
{
int ret;
@@ -216,16 +422,7 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
struct probe_point *pp;
char buf[MAX_CMDLEN];
- snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
- fd = open(buf, O_WRONLY, O_APPEND);
- if (fd < 0) {
- if (errno == ENOENT)
- die("kprobe_events file does not exist -"
- " please rebuild with CONFIG_KPROBE_TRACER.");
- else
- die("Could not open kprobe_events file: %s",
- strerror(errno));
- }
+ fd = open_kprobe_events(O_WRONLY, O_APPEND);
for (j = 0; j < nr_probes; j++) {
pp = probes + j;