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perf probe: Introduce kprobe_trace_event and perf_probe_event 

Introduce kprobe_trace_event and perf_probe_event and replace
old probe_point structure with it. probe_point structure is
not enough flexible nor extensible. New data structures
will help implementing further features.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100316220612.32050.33806.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2010-03-16 18:06:12 -04:00 committed by Ingo Molnar
parent f4d7da499e
commit 4235b0454e
5 changed files with 605 additions and 392 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
tools/perf/builtin-probe.c
View File

@ -48,12 +48,11 @@
/* Session management structure */
static struct {
bool need_dwarf;
bool list_events;
bool force_add;
bool show_lines;
int nr_probe;
struct probe_point probes[MAX_PROBES];
int nevents;
struct perf_probe_event events[MAX_PROBES];
struct strlist *dellist;
struct line_range line_range;
} params;
@ -62,16 +61,16 @@ static struct {
/* Parse an event definition. Note that any error must die. */
static void parse_probe_event(const char *str)
{
struct probe_point *pp = &params.probes[params.nr_probe];
struct perf_probe_event *pev = &params.events[params.nevents];
pr_debug("probe-definition(%d): %s\n", params.nr_probe, str);
if (++params.nr_probe == MAX_PROBES)
pr_debug("probe-definition(%d): %s\n", params.nevents, str);
if (++params.nevents == MAX_PROBES)
die("Too many probes (> %d) are specified.", MAX_PROBES);
/* Parse perf-probe event into probe_point */
parse_perf_probe_event(str, pp, &params.need_dwarf);
/* Parse a perf-probe command into event */
parse_perf_probe_command(str, pev);
pr_debug("%d arguments\n", pp->nr_args);
pr_debug("%d arguments\n", pev->nargs);
}
static void parse_probe_event_argv(int argc, const char **argv)
@ -191,7 +190,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
parse_probe_event_argv(argc, argv);
}
if ((!params.nr_probe && !params.dellist && !params.list_events &&
if ((!params.nevents && !params.dellist && !params.list_events &&
!params.show_lines))
usage_with_options(probe_usage, options);
@ -199,7 +198,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
die("Failed to find debugfs path.");
if (params.list_events) {
if (params.nr_probe != 0 || params.dellist) {
if (params.nevents != 0 || params.dellist) {
pr_warning(" Error: Don't use --list with"
" --add/--del.\n");
usage_with_options(probe_usage, options);
@ -214,7 +213,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
#ifndef NO_DWARF_SUPPORT
if (params.show_lines) {
if (params.nr_probe != 0 || params.dellist) {
if (params.nevents != 0 || params.dellist) {
pr_warning(" Error: Don't use --line with"
" --add/--del.\n");
usage_with_options(probe_usage, options);
@ -226,14 +225,13 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
#endif
if (params.dellist) {
del_trace_kprobe_events(params.dellist);
del_perf_probe_events(params.dellist);
strlist__delete(params.dellist);
if (params.nr_probe == 0)
if (params.nevents == 0)
return 0;
}
add_trace_kprobe_events(params.probes, params.nr_probe,
params.force_add, params.need_dwarf);
add_perf_probe_events(params.events, params.nevents, params.force_add);
return 0;
}

658
tools/perf/util/probe-event.c
View File

@ -44,6 +44,7 @@
#include "thread.h"
#include "parse-events.h" /* For debugfs_path */
#include "probe-event.h"
#include "probe-finder.h"
#define MAX_CMDLEN 256
#define MAX_PROBE_ARGS 128
@ -150,8 +151,9 @@ static bool check_event_name(const char *name)
}
/* Parse probepoint definition. */
static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
static void parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
{
struct perf_probe_point *pp = &pev->point;
char *ptr, *tmp;
char c, nc = 0;
/*
@ -172,7 +174,8 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
if (!check_event_name(arg))
semantic_error("%s is bad for event name -it must "
"follow C symbol-naming rule.", arg);
pp->event = xstrdup(arg);
pev->event = xstrdup(arg);
pev->group = NULL;
arg = tmp;
}
@ -255,57 +258,65 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
semantic_error("Offset/Line/Lazy pattern can't be used with "
"return probe.");
pr_debug("symbol:%s file:%s line:%d offset:%d return:%d lazy:%s\n",
pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
pp->lazy_line);
}
/* Parse perf-probe event definition */
void parse_perf_probe_event(const char *str, struct probe_point *pp,
bool *need_dwarf)
/* Parse perf-probe event command */
void parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
{
char **argv;
int argc, i;
*need_dwarf = false;
argv = argv_split(str, &argc);
argv = argv_split(cmd, &argc);
if (!argv)
die("argv_split failed.");
if (argc > MAX_PROBE_ARGS + 1)
semantic_error("Too many arguments");
/* Parse probe point */
parse_perf_probe_probepoint(argv[0], pp);
if (pp->file || pp->line || pp->lazy_line)
*need_dwarf = true;
parse_perf_probe_point(argv[0], pev);
/* Copy arguments and ensure return probe has no C argument */
pp->nr_args = argc - 1;
pp->args = xzalloc(sizeof(char *) * pp->nr_args);
for (i = 0; i < pp->nr_args; i++) {
pp->args[i] = xstrdup(argv[i + 1]);
if (is_c_varname(pp->args[i])) {
if (pp->retprobe)
semantic_error("You can't specify local"
" variable for kretprobe");
*need_dwarf = true;
}
pev->nargs = argc - 1;
pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
for (i = 0; i < pev->nargs; i++) {
pev->args[i].name = xstrdup(argv[i + 1]);
if (is_c_varname(pev->args[i].name) && pev->point.retprobe)
semantic_error("You can't specify local variable for"
" kretprobe");
}
argv_free(argv);
}
/* Parse kprobe_events event into struct probe_point */
void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
/* Return true if this perf_probe_event requires debuginfo */
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
{
int i;
if (pev->point.file || pev->point.line || pev->point.lazy_line)
return true;
for (i = 0; i < pev->nargs; i++)
if (is_c_varname(pev->args[i].name))
return true;
return false;
}
/* Parse kprobe_events event into struct probe_point */
void parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
{
struct kprobe_trace_point *tp = &tev->point;
char pr;
char *p;
int ret, i, argc;
char **argv;
pr_debug("Parsing kprobe_events: %s\n", str);
argv = argv_split(str, &argc);
pr_debug("Parsing kprobe_events: %s\n", cmd);
argv = argv_split(cmd, &argc);
if (!argv)
die("argv_split failed.");
if (argc < 2)
@ -313,47 +324,46 @@ void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
/* Scan event and group name. */
ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
&pr, (float *)(void *)&pp->group,
(float *)(void *)&pp->event);
&pr, (float *)(void *)&tev->group,
(float *)(void *)&tev->event);
if (ret != 3)
semantic_error("Failed to parse event name: %s", argv[0]);
pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr);
pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
pp->retprobe = (pr == 'r');
tp->retprobe = (pr == 'r');
/* Scan function name and offset */
ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function,
&pp->offset);
ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
&tp->offset);
if (ret == 1)
pp->offset = 0;
tp->offset = 0;
/* kprobe_events doesn't have this information */
pp->line = 0;
pp->file = NULL;
pp->nr_args = argc - 2;
pp->args = xzalloc(sizeof(char *) * pp->nr_args);
for (i = 0; i < pp->nr_args; i++) {
tev->nargs = argc - 2;
tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
for (i = 0; i < tev->nargs; i++) {
p = strchr(argv[i + 2], '=');
if (p) /* We don't need which register is assigned. */
*p = '\0';
pp->args[i] = xstrdup(argv[i + 2]);
*p++ = '\0';
else
p = argv[i + 2];
tev->args[i].name = xstrdup(argv[i + 2]);
/* TODO: parse regs and offset */
tev->args[i].value = xstrdup(p);
}
argv_free(argv);
}
/* Synthesize only probe point (not argument) */
int synthesize_perf_probe_point(struct probe_point *pp)
/* Compose only probe point (not argument) */
static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
{
char *buf;
char offs[64] = "", line[64] = "";
int ret;
pp->probes[0] = buf = xzalloc(MAX_CMDLEN);
pp->found = 1;
buf = xzalloc(MAX_CMDLEN);
if (pp->offset) {
ret = e_snprintf(offs, 64, "+%d", pp->offset);
ret = e_snprintf(offs, 64, "+%lu", pp->offset);
if (ret <= 0)
goto error;
}
@ -368,68 +378,209 @@ int synthesize_perf_probe_point(struct probe_point *pp)
offs, pp->retprobe ? "%return" : "", line);
else
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line);
if (ret <= 0) {
error:
free(pp->probes[0]);
pp->probes[0] = NULL;
pp->found = 0;
}
return ret;
}
int synthesize_perf_probe_event(struct probe_point *pp)
{
char *buf;
int i, len, ret;
len = synthesize_perf_probe_point(pp);
if (len < 0)
return 0;
buf = pp->probes[0];
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]);
pp->probes[0] = NULL;
return ret;
}
int synthesize_trace_kprobe_event(struct probe_point *pp)
{
char *buf;
int i, len, ret;
pp->probes[0] = buf = xzalloc(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++) {
return buf;
error:
die("Failed to synthesize perf probe point: %s", strerror(-ret));
}
#if 0
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
{
char *buf;
int i, len, ret;
buf = synthesize_perf_probe_point(&pev->point);
if (!buf)
return NULL;
len = strlen(buf);
for (i = 0; i < pev->nargs; i++) {
ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
pp->args[i]);
pev->args[i].name);
if (ret <= 0) {
free(buf);
return NULL;
}
len += ret;
}
return buf;
}
#endif
static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
char **buf, size_t *buflen,
int depth)
{
int ret;
if (ref->next) {
depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
buflen, depth + 1);
if (depth < 0)
goto out;
}
ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
if (ret < 0)
depth = ret;
else {
*buf += ret;
*buflen -= ret;
}
out:
return depth;
}
static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
char *buf, size_t buflen)
{
int ret, depth = 0;
char *tmp = buf;
/* Argument name or separator */
if (arg->name)
ret = e_snprintf(buf, buflen, " %s=", arg->name);
else
ret = e_snprintf(buf, buflen, " ");
if (ret < 0)
return ret;
buf += ret;
buflen -= ret;
/* Dereferencing arguments */
if (arg->ref) {
depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
&buflen, 1);
if (depth < 0)
return depth;
}
/* Print argument value */
ret = e_snprintf(buf, buflen, "%s", arg->value);
if (ret < 0)
return ret;
buf += ret;
buflen -= ret;
/* Closing */
while (depth--) {
ret = e_snprintf(buf, buflen, ")");
if (ret < 0)
return ret;
buf += ret;
buflen -= ret;
}
return buf - tmp;
}
char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
{
struct kprobe_trace_point *tp = &tev->point;
char *buf;
int i, len, ret;
buf = xzalloc(MAX_CMDLEN);
len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
tp->retprobe ? 'r' : 'p',
tev->group, tev->event,
tp->symbol, tp->offset);
if (len <= 0)
goto error;
for (i = 0; i < tev->nargs; i++) {
ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
MAX_CMDLEN - len);
if (ret <= 0)
goto error;
len += ret;
}
pp->found = 1;
return pp->found;
return buf;
error:
free(pp->probes[0]);
pp->probes[0] = NULL;
free(buf);
return NULL;
}
return ret;
void convert_to_perf_probe_event(struct kprobe_trace_event *tev,
struct perf_probe_event *pev)
{
char buf[64];
int i;
pev->event = xstrdup(tev->event);
pev->group = xstrdup(tev->group);
/* Convert trace_point to probe_point */
pev->point.function = xstrdup(tev->point.symbol);
pev->point.offset = tev->point.offset;
pev->point.retprobe = tev->point.retprobe;
/* Convert trace_arg to probe_arg */
pev->nargs = tev->nargs;
pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
for (i = 0; i < tev->nargs; i++)
if (tev->args[i].name)
pev->args[i].name = xstrdup(tev->args[i].name);
else {
synthesize_kprobe_trace_arg(&tev->args[i], buf, 64);
pev->args[i].name = xstrdup(buf);
}
}
void clear_perf_probe_event(struct perf_probe_event *pev)
{
struct perf_probe_point *pp = &pev->point;
int i;
if (pev->event)
free(pev->event);
if (pev->group)
free(pev->group);
if (pp->file)
free(pp->file);
if (pp->function)
free(pp->function);
if (pp->lazy_line)
free(pp->lazy_line);
for (i = 0; i < pev->nargs; i++)
if (pev->args[i].name)
free(pev->args[i].name);
if (pev->args)
free(pev->args);
memset(pev, 0, sizeof(*pev));
}
void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
{
struct kprobe_trace_arg_ref *ref, *next;
int i;
if (tev->event)
free(tev->event);
if (tev->group)
free(tev->group);
if (tev->point.symbol)
free(tev->point.symbol);
for (i = 0; i < tev->nargs; i++) {
if (tev->args[i].name)
free(tev->args[i].name);
if (tev->args[i].value)
free(tev->args[i].value);
ref = tev->args[i].ref;
while (ref) {
next = ref->next;
free(ref);
ref = next;
}
}
if (tev->args)
free(tev->args);
memset(tev, 0, sizeof(*tev));
}
static int open_kprobe_events(bool readwrite)
@ -458,7 +609,7 @@ static int open_kprobe_events(bool readwrite)
}
/* Get raw string list of current kprobe_events */
static struct strlist *get_trace_kprobe_event_rawlist(int fd)
static struct strlist *get_kprobe_trace_command_rawlist(int fd)
{
int ret, idx;
FILE *fp;
@ -486,99 +637,82 @@ static struct strlist *get_trace_kprobe_event_rawlist(int fd)
return sl;
}
/* Free and zero clear probe_point */
static void clear_probe_point(struct probe_point *pp)
{
int i;
if (pp->event)
free(pp->event);
if (pp->group)
free(pp->group);
if (pp->function)
free(pp->function);
if (pp->file)
free(pp->file);
if (pp->lazy_line)
free(pp->lazy_line);
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));
}
/* Show an event */
static void show_perf_probe_event(const char *event, const char *place,
struct probe_point *pp)
static void show_perf_probe_event(struct perf_probe_event *pev)
{
int i, ret;
char buf[128];
char *place;
ret = e_snprintf(buf, 128, "%s:%s", pp->group, event);
/* Synthesize only event probe point */
place = synthesize_perf_probe_point(&pev->point);
ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
if (ret < 0)
die("Failed to copy event: %s", strerror(-ret));
printf(" %-40s (on %s", buf, place);
if (pp->nr_args > 0) {
if (pev->nargs > 0) {
printf(" with");
for (i = 0; i < pp->nr_args; i++)
printf(" %s", pp->args[i]);
for (i = 0; i < pev->nargs; i++)
printf(" %s", pev->args[i].name);
}
printf(")\n");
free(place);
}
/* List up current perf-probe events */
void show_perf_probe_events(void)
{
int fd;
struct probe_point pp;
struct kprobe_trace_event tev;
struct perf_probe_event pev;
struct strlist *rawlist;
struct str_node *ent;
setup_pager();
memset(&pp, 0, sizeof(pp));
memset(&tev, 0, sizeof(tev));
memset(&pev, 0, sizeof(pev));
fd = open_kprobe_events(false);
rawlist = get_trace_kprobe_event_rawlist(fd);
rawlist = get_kprobe_trace_command_rawlist(fd);
close(fd);
strlist__for_each(ent, rawlist) {
parse_trace_kprobe_event(ent->s, &pp);
/* Synthesize only event probe point */
synthesize_perf_probe_point(&pp);
parse_kprobe_trace_command(ent->s, &tev);
convert_to_perf_probe_event(&tev, &pev);
/* Show an event */
show_perf_probe_event(pp.event, pp.probes[0], &pp);
clear_probe_point(&pp);
show_perf_probe_event(&pev);
clear_perf_probe_event(&pev);
clear_kprobe_trace_event(&tev);
}
strlist__delete(rawlist);
}
/* Get current perf-probe event names */
static struct strlist *get_perf_event_names(int fd, bool include_group)
static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
{
char buf[128];
struct strlist *sl, *rawlist;
struct str_node *ent;
struct probe_point pp;
struct kprobe_trace_event tev;
memset(&pp, 0, sizeof(pp));
rawlist = get_trace_kprobe_event_rawlist(fd);
memset(&tev, 0, sizeof(tev));
rawlist = get_kprobe_trace_command_rawlist(fd);
sl = strlist__new(true, NULL);
strlist__for_each(ent, rawlist) {
parse_trace_kprobe_event(ent->s, &pp);
parse_kprobe_trace_command(ent->s, &tev);
if (include_group) {
if (e_snprintf(buf, 128, "%s:%s", pp.group,
pp.event) < 0)
if (e_snprintf(buf, 128, "%s:%s", tev.group,
tev.event) < 0)
die("Failed to copy group:event name.");
strlist__add(sl, buf);
} else
strlist__add(sl, pp.event);
clear_probe_point(&pp);
strlist__add(sl, tev.event);
clear_kprobe_trace_event(&tev);
}
strlist__delete(rawlist);
@ -586,9 +720,10 @@ static struct strlist *get_perf_event_names(int fd, bool include_group)
return sl;
}
static void write_trace_kprobe_event(int fd, const char *buf)
static void write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
{
int ret;
char *buf = synthesize_kprobe_trace_command(tev);
pr_debug("Writing event: %s\n", buf);
if (!probe_event_dry_run) {
@ -596,6 +731,7 @@ static void write_trace_kprobe_event(int fd, const char *buf)
if (ret <= 0)
die("Failed to write event: %s", strerror(errno));
}
free(buf);
}
static void get_new_event_name(char *buf, size_t len, const char *base,
@ -628,81 +764,83 @@ static void get_new_event_name(char *buf, size_t len, const char *base,
die("Too many events are on the same function.");
}
static void __add_trace_kprobe_events(struct probe_point *probes,
int nr_probes, bool force_add)
static void __add_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event *tevs,
int ntevs, bool allow_suffix)
{
int i, j, fd;
struct probe_point *pp;
char buf[MAX_CMDLEN];
char event[64];
int i, fd;
struct kprobe_trace_event *tev;
char buf[64];
const char *event, *group;
struct strlist *namelist;
bool allow_suffix;
fd = open_kprobe_events(true);
/* Get current event names */
namelist = get_perf_event_names(fd, false);
namelist = get_kprobe_trace_event_names(fd, false);
for (j = 0; j < nr_probes; j++) {
pp = probes + j;
if (!pp->event)
pp->event = xstrdup(pp->function);
if (!pp->group)
pp->group = xstrdup(PERFPROBE_GROUP);
/* If force_add is true, suffix search is allowed */
allow_suffix = force_add;
for (i = 0; i < pp->found; i++) {
/* Get an unused new event name */
get_new_event_name(event, 64, pp->event, namelist,
allow_suffix);
snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n",
pp->retprobe ? 'r' : 'p',
pp->group, event,
pp->probes[i]);
write_trace_kprobe_event(fd, buf);
printf("Added new event:\n");
/* Get the first parameter (probe-point) */
sscanf(pp->probes[i], "%s", buf);
show_perf_probe_event(event, buf, pp);
/* Add added event name to namelist */
strlist__add(namelist, event);
/*
* Probes after the first probe which comes from same
* user input are always allowed to add suffix, because
* there might be several addresses corresponding to
* one code line.
*/
allow_suffix = true;
}
printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
for (i = 0; i < ntevs; i++) {
tev = &tevs[i];
if (pev->event)
event = pev->event;
else
if (pev->point.function)
event = pev->point.function;
else
event = tev->point.symbol;
if (pev->group)
group = pev->group;
else
group = PERFPROBE_GROUP;
/* Get an unused new event name */
get_new_event_name(buf, 64, event, namelist, allow_suffix);
event = buf;
tev->event = xstrdup(event);
tev->group = xstrdup(group);
write_kprobe_trace_event(fd, tev);
/* Add added event name to namelist */
strlist__add(namelist, event);
/* Trick here - save current event/group */
event = pev->event;
group = pev->group;
pev->event = tev->event;
pev->group = tev->group;
show_perf_probe_event(pev);
/* Trick here - restore current event/group */
pev->event = (char *)event;
pev->group = (char *)group;
/*
* Probes after the first probe which comes from same
* user input are always allowed to add suffix, because
* there might be several addresses corresponding to
* one code line.
*/
allow_suffix = true;
}
/* Show how to use the event. */
printf("\nYou can now use it on all perf tools, such as:\n\n");
printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event);
printf("\tperf record -e %s:%s -a sleep 1\n\n", tev->group, tev->event);
strlist__delete(namelist);
close(fd);
}
/* Currently just checking function name from symbol map */
static void evaluate_probe_point(struct probe_point *pp)
static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event **tevs)
{
struct symbol *sym;
sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
pp->function, NULL);
if (!sym)
die("Kernel symbol \'%s\' not found - probe not added.",
pp->function);
}
void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
bool force_add, bool need_dwarf)
{
int i, ret;
struct probe_point *pp;
bool need_dwarf;
#ifndef NO_DWARF_SUPPORT
int fd;
#endif
/* Add probes */
init_vmlinux();
int ntevs = 0, i;
struct kprobe_trace_event *tev;
need_dwarf = perf_probe_event_need_dwarf(pev);
if (need_dwarf)
#ifdef NO_DWARF_SUPPORT
@ -721,57 +859,90 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
}
/* Searching probe points */
for (i = 0; i < nr_probes; i++) {
pp = &probes[i];
if (pp->found)
continue;
ntevs = find_kprobe_trace_events(fd, pev, tevs);
lseek(fd, SEEK_SET, 0);
ret = find_probe_point(fd, pp);
if (ret > 0)
continue;
if (ret == 0) { /* No error but failed to find probe point. */
synthesize_perf_probe_point(pp);
die("Probe point '%s' not found. - probe not added.",
pp->probes[0]);
}
/* Error path */
if (need_dwarf) {
if (ret == -ENOENT)
pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
die("Could not analyze debuginfo.");
}
pr_debug("An error occurred in debuginfo analysis."
" Try to use symbols.\n");
break;
if (ntevs > 0) /* Found */
goto found;
if (ntevs == 0) /* No error but failed to find probe point. */
die("Probe point '%s' not found. - probe not added.",
synthesize_perf_probe_point(&pev->point));
/* Error path */
if (need_dwarf) {
if (ntevs == -ENOENT)
pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
die("Could not analyze debuginfo.");
}
close(fd);
pr_debug("An error occurred in debuginfo analysis."
" Try to use symbols.\n");
end_dwarf:
#endif /* !NO_DWARF_SUPPORT */
/* Synthesize probes without dwarf */
for (i = 0; i < nr_probes; i++) {
pp = &probes[i];
if (pp->found) /* This probe is already found. */
continue;
/* Allocate trace event buffer */
ntevs = 1;
tev = *tevs = xzalloc(sizeof(struct kprobe_trace_event));
evaluate_probe_point(pp);
ret = synthesize_trace_kprobe_event(pp);
if (ret == -E2BIG)
die("probe point definition becomes too long.");
else if (ret < 0)
die("Failed to synthesize a probe point.");
/* Copy parameters */
tev->point.symbol = xstrdup(pev->point.function);
tev->point.offset = pev->point.offset;
tev->nargs = pev->nargs;
if (tev->nargs) {
tev->args = xzalloc(sizeof(struct kprobe_trace_arg)
* tev->nargs);
for (i = 0; i < tev->nargs; i++)
tev->args[i].value = xstrdup(pev->args[i].name);
}
/* Settng up probe points */
__add_trace_kprobe_events(probes, nr_probes, force_add);
/* Currently just checking function name from symbol map */
sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
tev->point.symbol, NULL);
if (!sym)
die("Kernel symbol \'%s\' not found - probe not added.",
tev->point.symbol);
found:
close(fd);
return ntevs;
}
struct __event_package {
struct perf_probe_event *pev;
struct kprobe_trace_event *tevs;
int ntevs;
};
void add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
bool force_add)
{
int i;
struct __event_package *pkgs;
pkgs = xzalloc(sizeof(struct __event_package) * npevs);
/* Init vmlinux path */
init_vmlinux();
/* Loop 1: convert all events */
for (i = 0; i < npevs; i++) {
pkgs[i].pev = &pevs[i];
/* Convert with or without debuginfo */
pkgs[i].ntevs = convert_to_kprobe_trace_events(pkgs[i].pev,
&pkgs[i].tevs);
}
/* Loop 2: add all events */
for (i = 0; i < npevs; i++)
__add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
pkgs[i].ntevs, force_add);
/* TODO: cleanup all trace events? */
}
static void __del_trace_kprobe_event(int fd, struct str_node *ent)
{
char *p;
char buf[128];
int ret;
/* Convert from perf-probe event to trace-kprobe event */
if (e_snprintf(buf, 128, "-:%s", ent->s) < 0)
@ -781,7 +952,10 @@ static void __del_trace_kprobe_event(int fd, struct str_node *ent)
die("Internal error: %s should have ':' but not.", ent->s);
*p = '/';
write_trace_kprobe_event(fd, buf);
pr_debug("Writing event: %s\n", buf);
ret = write(fd, buf, strlen(buf));
if (ret <= 0)
die("Failed to write event: %s", strerror(errno));
printf("Remove event: %s\n", ent->s);
}
@ -814,7 +988,7 @@ static void del_trace_kprobe_event(int fd, const char *group,
pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
}
void del_trace_kprobe_events(struct strlist *dellist)
void del_perf_probe_events(struct strlist *dellist)
{
int fd;
const char *group, *event;
@ -824,7 +998,7 @@ void del_trace_kprobe_events(struct strlist *dellist)
fd = open_kprobe_events(true);
/* Get current event names */
namelist = get_perf_event_names(fd, true);
namelist = get_kprobe_trace_event_names(fd, true);
strlist__for_each(ent, dellist) {
str = xstrdup(ent->s);

111
tools/perf/util/probe-event.h
View File

@ -2,24 +2,113 @@
#define _PROBE_EVENT_H
#include <stdbool.h>
#include "probe-finder.h"
#include "strlist.h"
extern bool probe_event_dry_run;
extern void parse_line_range_desc(const char *arg, struct line_range *lr);
extern void parse_perf_probe_event(const char *str, struct probe_point *pp,
bool *need_dwarf);
extern int synthesize_perf_probe_point(struct probe_point *pp);
extern int synthesize_perf_probe_event(struct probe_point *pp);
extern void parse_trace_kprobe_event(const char *str, struct probe_point *pp);
extern int synthesize_trace_kprobe_event(struct probe_point *pp);
extern void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
bool force_add, bool need_dwarf);
extern void del_trace_kprobe_events(struct strlist *dellist);
/* kprobe-tracer tracing point */
struct kprobe_trace_point {
char *symbol; /* Base symbol */
unsigned long offset; /* Offset from symbol */
bool retprobe; /* Return probe flag */
};
/* kprobe-tracer tracing argument referencing offset */
struct kprobe_trace_arg_ref {
struct kprobe_trace_arg_ref *next; /* Next reference */
long offset; /* Offset value */
};
/* kprobe-tracer tracing argument */
struct kprobe_trace_arg {
char *name; /* Argument name */
char *value; /* Base value */
struct kprobe_trace_arg_ref *ref; /* Referencing offset */
};
/* kprobe-tracer tracing event (point + arg) */
struct kprobe_trace_event {
char *event; /* Event name */
char *group; /* Group name */
struct kprobe_trace_point point; /* Trace point */
int nargs; /* Number of args */
struct kprobe_trace_arg *args; /* Arguments */
};
/* Perf probe probing point */
struct perf_probe_point {
char *file; /* File path */
char *function; /* Function name */
int line; /* Line number */
char *lazy_line; /* Lazy matching pattern */
unsigned long offset; /* Offset from function entry */
bool retprobe; /* Return probe flag */
};
/* Perf probe probing argument */
struct perf_probe_arg {
char *name; /* Argument name */
};
/* Perf probe probing event (point + arg) */
struct perf_probe_event {
char *event; /* Event name */
char *group; /* Group name */
struct perf_probe_point point; /* Probe point */
int nargs; /* Number of arguments */
struct perf_probe_arg *args; /* Arguments */
};
/* Line number container */
struct line_node {
struct list_head list;
unsigned int line;
};
/* Line range */
struct line_range {
char *file; /* File name */
char *function; /* Function name */
unsigned int start; /* Start line number */
unsigned int end; /* End line number */
int offset; /* Start line offset */
char *path; /* Real path name */
struct list_head line_list; /* Visible lines */
};
/* Command string to events */
extern void parse_perf_probe_command(const char *cmd,
struct perf_probe_event *pev);
extern void parse_kprobe_trace_command(const char *cmd,
struct kprobe_trace_event *tev);
/* Events to command string */
extern char *synthesize_perf_probe_command(struct perf_probe_event *pev);
extern char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev);
/* Check the perf_probe_event needs debuginfo */
extern bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
/* Convert from kprobe_trace_event to perf_probe_event */
extern void convert_to_perf_probe_event(struct kprobe_trace_event *tev,
struct perf_probe_event *pev);
/* Release event contents */
extern void clear_perf_probe_event(struct perf_probe_event *pev);
extern void clear_kprobe_trace_event(struct kprobe_trace_event *tev);
/* Command string to line-range */
extern void parse_line_range_desc(const char *cmd, struct line_range *lr);
extern void add_perf_probe_events(struct perf_probe_event *pevs, int ntevs,
bool force_add);
extern void del_perf_probe_events(struct strlist *dellist);
extern void show_perf_probe_events(void);
extern void show_line_range(struct line_range *lr);
/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024

140
tools/perf/util/probe-finder.c
View File

@ -319,19 +319,20 @@ static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
*/
/* Show a location */
static void show_location(Dwarf_Op *op, struct probe_finder *pf)
static void convert_location(Dwarf_Op *op, struct probe_finder *pf)
{
unsigned int regn;
Dwarf_Word offs = 0;
int deref = 0, ret;
bool ref = false;
const char *regs;
struct kprobe_trace_arg *tvar = pf->tvar;
/* TODO: support CFA */
/* If this is based on frame buffer, set the offset */
if (op->atom == DW_OP_fbreg) {
if (pf->fb_ops == NULL)
die("The attribute of frame base is not supported.\n");
deref = 1;
ref = true;
offs = op->number;
op = &pf->fb_ops[0];
}
@ -339,13 +340,13 @@ static void show_location(Dwarf_Op *op, struct probe_finder *pf)
if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
regn = op->atom - DW_OP_breg0;
offs += op->number;
deref = 1;
ref = true;
} else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
regn = op->atom - DW_OP_reg0;
} else if (op->atom == DW_OP_bregx) {
regn = op->number;
offs += op->number2;
deref = 1;
ref = true;
} else if (op->atom == DW_OP_regx) {
regn = op->number;
} else
@ -355,17 +356,15 @@ static void show_location(Dwarf_Op *op, struct probe_finder *pf)
if (!regs)
die("%u exceeds max register number.", regn);
if (deref)
ret = snprintf(pf->buf, pf->len, " %s=%+jd(%s)",
pf->var, (intmax_t)offs, regs);
else
ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs);
DIE_IF(ret < 0);
DIE_IF(ret >= pf->len);
tvar->value = xstrdup(regs);
if (ref) {
tvar->ref = xzalloc(sizeof(struct kprobe_trace_arg_ref));
tvar->ref->offset = (long)offs;
}
}
/* Show a variables in kprobe event format */
static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
static void convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
{
Dwarf_Attribute attr;
Dwarf_Op *expr;
@ -379,50 +378,51 @@ static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
if (ret <= 0 || nexpr == 0)
goto error;
show_location(expr, pf);
convert_location(expr, pf);
/* *expr will be cached in libdw. Don't free it. */
return ;
error:
/* TODO: Support const_value */
die("Failed to find the location of %s at this address.\n"
" Perhaps, it has been optimized out.", pf->var);
" Perhaps, it has been optimized out.", pf->pvar->name);
}
/* Find a variable in a subprogram die */
static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
{
int ret;
Dwarf_Die vr_die;
/* TODO: Support struct members and arrays */
if (!is_c_varname(pf->var)) {
/* Output raw parameters */
ret = snprintf(pf->buf, pf->len, " %s", pf->var);
DIE_IF(ret < 0);
DIE_IF(ret >= pf->len);
return ;
if (!is_c_varname(pf->pvar->name)) {
/* Copy raw parameters */
pf->tvar->value = xstrdup(pf->pvar->name);
} else {
pf->tvar->name = xstrdup(pf->pvar->name);
pr_debug("Searching '%s' variable in context.\n",
pf->pvar->name);
/* Search child die for local variables and parameters. */
if (!die_find_variable(sp_die, pf->pvar->name, &vr_die))
die("Failed to find '%s' in this function.",
pf->pvar->name);
convert_variable(&vr_die, pf);
}
pr_debug("Searching '%s' variable in context.\n", pf->var);
/* Search child die for local variables and parameters. */
if (!die_find_variable(sp_die, pf->var, &vr_die))
die("Failed to find '%s' in this function.", pf->var);
show_variable(&vr_die, pf);
}
/* Show a probe point to output buffer */
static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
static void convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
{
struct probe_point *pp = pf->pp;
struct kprobe_trace_event *tev;
Dwarf_Addr eaddr;
Dwarf_Die die_mem;
const char *name;
char tmp[MAX_PROBE_BUFFER];
int ret, i, len;
int ret, i;
Dwarf_Attribute fb_attr;
size_t nops;
if (pf->ntevs == MAX_PROBES)
die("Too many( > %d) probe point found.\n", MAX_PROBES);
tev = &pf->tevs[pf->ntevs++];
/* If no real subprogram, find a real one */
if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) {
sp_die = die_find_real_subprogram(&pf->cu_die,
@ -431,31 +431,18 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
die("Probe point is not found in subprograms.");
}
/* Output name of probe point */
/* Copy the name of probe point */
name = dwarf_diename(sp_die);
if (name) {
dwarf_entrypc(sp_die, &eaddr);
ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%lu", name,
(unsigned long)(pf->addr - eaddr));
/* Copy the function name if possible */
if (!pp->function) {
pp->function = xstrdup(name);
pp->offset = (size_t)(pf->addr - eaddr);
}
} else {
tev->point.symbol = xstrdup(name);
tev->point.offset = (unsigned long)(pf->addr - eaddr);
} else
/* This function has no name. */
ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%jx",
(uintmax_t)pf->addr);
if (!pp->function) {
/* TODO: Use _stext */
pp->function = xstrdup("");
pp->offset = (size_t)pf->addr;
}
}
DIE_IF(ret < 0);
DIE_IF(ret >= MAX_PROBE_BUFFER);
len = ret;
pr_debug("Probe point found: %s\n", tmp);
tev->point.offset = (unsigned long)pf->addr;
pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
tev->point.offset);
/* Get the frame base attribute/ops */
dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
@ -465,22 +452,16 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
/* Find each argument */
/* TODO: use dwarf_cfi_addrframe */
for (i = 0; i < pp->nr_args; i++) {
pf->var = pp->args[i];
pf->buf = &tmp[len];
pf->len = MAX_PROBE_BUFFER - len;
tev->nargs = pf->pev->nargs;
tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
for (i = 0; i < pf->pev->nargs; i++) {
pf->pvar = &pf->pev->args[i];
pf->tvar = &tev->args[i];
find_variable(sp_die, pf);
len += strlen(pf->buf);
}
/* *pf->fb_ops will be cached in libdw. Don't free it. */
pf->fb_ops = NULL;
if (pp->found == MAX_PROBES)
die("Too many( > %d) probe point found.\n", MAX_PROBES);
pp->probes[pp->found] = xstrdup(tmp);
pp->found++;
}
/* Find probe point from its line number */
@ -512,7 +493,7 @@ static void find_probe_point_by_line(struct probe_finder *pf)
(int)i, lineno, (uintmax_t)addr);
pf->addr = addr;
show_probe_point(NULL, pf);
convert_probe_point(NULL, pf);
/* Continuing, because target line might be inlined. */
}
}
@ -563,7 +544,7 @@ static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
if (list_empty(&pf->lcache)) {
/* Matching lazy line pattern */
ret = find_lazy_match_lines(&pf->lcache, pf->fname,
pf->pp->lazy_line);
pf->pev->point.lazy_line);
if (ret <= 0)
die("No matched lines found in %s.", pf->fname);
}
@ -596,7 +577,7 @@ static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
(int)i, lineno, (unsigned long long)addr);
pf->addr = addr;
show_probe_point(sp_die, pf);
convert_probe_point(sp_die, pf);
/* Continuing, because target line might be inlined. */
}
/* TODO: deallocate lines, but how? */
@ -605,7 +586,7 @@ static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
struct probe_point *pp = pf->pp;
struct perf_probe_point *pp = &pf->pev->point;
if (pp->lazy_line)
find_probe_point_lazy(in_die, pf);
@ -616,7 +597,7 @@ static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
pr_debug("found inline addr: 0x%jx\n",
(uintmax_t)pf->addr);
show_probe_point(in_die, pf);
convert_probe_point(in_die, pf);
}
return DWARF_CB_OK;
@ -626,7 +607,7 @@ static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
struct probe_point *pp = pf->pp;
struct perf_probe_point *pp = &pf->pev->point;
/* Check tag and diename */
if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
@ -646,7 +627,7 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
pf->addr = die_get_entrypc(sp_die);
pf->addr += pp->offset;
/* TODO: Check the address in this function */
show_probe_point(sp_die, pf);
convert_probe_point(sp_die, pf);
}
} else
/* Inlined function: search instances */
@ -660,20 +641,25 @@ static void find_probe_point_by_func(struct probe_finder *pf)
dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, pf, 0);
}
/* Find a probe point */
int find_probe_point(int fd, struct probe_point *pp)
/* Find kprobe_trace_events specified by perf_probe_event from debuginfo */
int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
struct kprobe_trace_event **tevs)
{
struct probe_finder pf = {.pp = pp};
struct probe_finder pf = {.pev = pev};
struct perf_probe_point *pp = &pev->point;
Dwarf_Off off, noff;
size_t cuhl;
Dwarf_Die *diep;
Dwarf *dbg;
pf.tevs = xzalloc(sizeof(struct kprobe_trace_event) * MAX_PROBES);
*tevs = pf.tevs;
pf.ntevs = 0;
dbg = dwarf_begin(fd, DWARF_C_READ);
if (!dbg)
return -ENOENT;
pp->found = 0;
off = 0;
line_list__init(&pf.lcache);
/* Loop on CUs (Compilation Unit) */
@ -704,7 +690,7 @@ int find_probe_point(int fd, struct probe_point *pp)
line_list__free(&pf.lcache);
dwarf_end(dbg);
return pp->found;
return pf.ntevs;
}
/* Find line range from its line number */

58
tools/perf/util/probe-finder.h
View File

@ -3,6 +3,7 @@
#include <stdbool.h>
#include "util.h"
#include "probe-event.h"
#define MAX_PATH_LEN 256
#define MAX_PROBE_BUFFER 1024
@ -14,67 +15,32 @@ static inline int is_c_varname(const char *name)
return isalpha(name[0]) || name[0] == '_';
}
struct probe_point {
char *event; /* Event name */
char *group; /* Event group */
/* Inputs */
char *file; /* File name */
int line; /* Line number */
char *lazy_line; /* Lazy line pattern */
char *function; /* Function name */
int offset; /* Offset bytes */
int nr_args; /* Number of arguments */
char **args; /* Arguments */
int retprobe; /* Return probe */
/* Output */
int found; /* Number of found probe points */
char *probes[MAX_PROBES]; /* Output buffers (will be allocated)*/
};
/* Line number container */
struct line_node {
struct list_head list;
unsigned int line;
};
/* Line range */
struct line_range {
char *file; /* File name */
char *function; /* Function name */
unsigned int start; /* Start line number */
unsigned int end; /* End line number */
int offset; /* Start line offset */
char *path; /* Real path name */
struct list_head line_list; /* Visible lines */
};
#ifndef NO_DWARF_SUPPORT
extern int find_probe_point(int fd, struct probe_point *pp);
/* Find kprobe_trace_events specified by perf_probe_event from debuginfo */
extern int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
struct kprobe_trace_event **tevs);
extern int find_line_range(int fd, struct line_range *lr);
#include <dwarf.h>
#include <libdw.h>
struct probe_finder {
struct probe_point *pp; /* Target probe point */
struct perf_probe_event *pev; /* Target probe event */
int ntevs; /* number of trace events */
struct kprobe_trace_event *tevs; /* Result trace events */
/* For function searching */
Dwarf_Addr addr; /* Address */
const char *fname; /* File name */
const char *fname; /* Real file name */
int lno; /* Line number */
Dwarf_Die cu_die; /* Current CU */
struct list_head lcache; /* Line cache for lazy match */
/* For variable searching */
Dwarf_Op *fb_ops; /* Frame base attribute */
const char *var; /* Current variable name */
char *buf; /* Current output buffer */
int len; /* Length of output buffer */
struct list_head lcache; /* Line cache for lazy match */
struct perf_probe_arg *pvar; /* Current target variable */
struct kprobe_trace_arg *tvar; /* Current result variable */
};
struct line_finder {