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-rw-r--r--tools/perf/Documentation/perf-probe.txt10
-rw-r--r--tools/perf/Documentation/perf-script.txt4
-rw-r--r--tools/perf/arch/powerpc/util/sym-handling.c27
-rw-r--r--tools/perf/builtin-script.c2
-rw-r--r--tools/perf/builtin-stat.c31
-rw-r--r--tools/perf/util/probe-event.c60
-rw-r--r--tools/perf/util/probe-event.h6
-rw-r--r--tools/perf/util/probe-finder.c15
-rw-r--r--tools/perf/util/sort.c6
9 files changed, 117 insertions, 44 deletions
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 736da44596e4..b303bcdd8ed1 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -176,10 +176,18 @@ Each probe argument follows below syntax.
'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), local array with fixed index (e.g. array[1], var->array[0], var->pointer[2]), or kprobe-tracer argument format (e.g. $retval, %ax, etc). Note that the name of this argument will be set as the last member name if you specify a local data structure member (e.g. field2 for 'var->field1.field2'.)
'$vars' and '$params' special arguments are also available for NAME, '$vars' is expanded to the local variables (including function parameters) which can access at given probe point. '$params' is expanded to only the function parameters.
-'TYPE' casts the type of this argument (optional). If omitted, perf probe automatically set the type based on debuginfo. You can specify 'string' type only for the local variable or structure member which is an array of or a pointer to 'char' or 'unsigned char' type.
+'TYPE' casts the type of this argument (optional). If omitted, perf probe automatically set the type based on debuginfo. Currently, basic types (u8/u16/u32/u64/s8/s16/s32/s64), signedness casting (u/s), "string" and bitfield are supported. (see TYPES for detail)
On x86 systems %REG is always the short form of the register: for example %AX. %RAX or %EAX is not valid.
+TYPES
+-----
+Basic types (u8/u16/u32/u64/s8/s16/s32/s64) are integer types. Prefix 's' and 'u' means those types are signed and unsigned respectively. Traced arguments are shown in decimal (signed) or hex (unsigned). You can also use 's' or 'u' to specify only signedness and leave its size auto-detected by perf probe.
+String type is a special type, which fetches a "null-terminated" string from kernel space. This means it will fail and store NULL if the string container has been paged out. You can specify 'string' type only for the local variable or structure member which is an array of or a pointer to 'char' or 'unsigned char' type.
+Bitfield is another special type, which takes 3 parameters, bit-width, bit-offset, and container-size (usually 32). The syntax is;
+
+ b<bit-width>@<bit-offset>/<container-size>
+
LINE SYNTAX
-----------
Line range is described by following syntax.
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 1f6c70594f0f..053bbbd84ece 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -116,8 +116,8 @@ OPTIONS
--fields::
Comma separated list of fields to print. Options are:
comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
- srcline, period, iregs, brstack, brstacksym, flags.
- Field list can be prepended with the type, trace, sw or hw,
+ srcline, period, iregs, brstack, brstacksym, flags, bpf-output,
+ callindent. Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -F sw:comm,tid,time,ip,sym and -F trace:time,cpu,trace
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index c6d0f91731a1..8d4dc97d80ba 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -54,10 +54,6 @@ int arch__compare_symbol_names(const char *namea, const char *nameb)
#endif
#if defined(_CALL_ELF) && _CALL_ELF == 2
-bool arch__prefers_symtab(void)
-{
- return true;
-}
#ifdef HAVE_LIBELF_SUPPORT
void arch__sym_update(struct symbol *s, GElf_Sym *sym)
@@ -100,4 +96,27 @@ void arch__fix_tev_from_maps(struct perf_probe_event *pev,
tev->point.offset += lep_offset;
}
}
+
+void arch__post_process_probe_trace_events(struct perf_probe_event *pev,
+ int ntevs)
+{
+ struct probe_trace_event *tev;
+ struct map *map;
+ struct symbol *sym = NULL;
+ struct rb_node *tmp;
+ int i = 0;
+
+ map = get_target_map(pev->target, pev->uprobes);
+ if (!map || map__load(map, NULL) < 0)
+ return;
+
+ for (i = 0; i < ntevs; i++) {
+ tev = &pev->tevs[i];
+ map__for_each_symbol(map, sym, tmp) {
+ if (map->unmap_ip(map, sym->start) == tev->point.address)
+ arch__fix_tev_from_maps(pev, tev, map, sym);
+ }
+ }
+}
+
#endif
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 971ff91b16cb..9c640a8081c7 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2116,7 +2116,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
"Valid types: hw,sw,trace,raw. "
"Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,"
"addr,symoff,period,iregs,brstack,brstacksym,flags,"
- "callindent", parse_output_fields),
+ "bpf-output,callindent", parse_output_fields),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 0c16d20d7e32..3c7452b39f57 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -331,7 +331,7 @@ static int read_counter(struct perf_evsel *counter)
return 0;
}
-static void read_counters(bool close_counters)
+static void read_counters(void)
{
struct perf_evsel *counter;
@@ -341,11 +341,6 @@ static void read_counters(bool close_counters)
if (perf_stat_process_counter(&stat_config, counter))
pr_warning("failed to process counter %s\n", counter->name);
-
- if (close_counters) {
- perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
- thread_map__nr(evsel_list->threads));
- }
}
}
@@ -353,7 +348,7 @@ static void process_interval(void)
{
struct timespec ts, rs;
- read_counters(false);
+ read_counters();
clock_gettime(CLOCK_MONOTONIC, &ts);
diff_timespec(&rs, &ts, &ref_time);
@@ -380,6 +375,17 @@ static void enable_counters(void)
perf_evlist__enable(evsel_list);
}
+static void disable_counters(void)
+{
+ /*
+ * If we don't have tracee (attaching to task or cpu), counters may
+ * still be running. To get accurate group ratios, we must stop groups
+ * from counting before reading their constituent counters.
+ */
+ if (!target__none(&target))
+ perf_evlist__disable(evsel_list);
+}
+
static volatile int workload_exec_errno;
/*
@@ -657,11 +663,20 @@ try_again:
}
}
+ disable_counters();
+
t1 = rdclock();
update_stats(&walltime_nsecs_stats, t1 - t0);
- read_counters(true);
+ /*
+ * Closing a group leader splits the group, and as we only disable
+ * group leaders, results in remaining events becoming enabled. To
+ * avoid arbitrary skew, we must read all counters before closing any
+ * group leaders.
+ */
+ read_counters();
+ perf_evlist__close(evsel_list);
return WEXITSTATUS(status);
}
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 953dc1ab2ed7..28733962cd80 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -170,15 +170,17 @@ static struct map *kernel_get_module_map(const char *module)
module = "kernel";
for (pos = maps__first(maps); pos; pos = map__next(pos)) {
+ /* short_name is "[module]" */
if (strncmp(pos->dso->short_name + 1, module,
- pos->dso->short_name_len - 2) == 0) {
+ pos->dso->short_name_len - 2) == 0 &&
+ module[pos->dso->short_name_len - 2] == '\0') {
return pos;
}
}
return NULL;
}
-static struct map *get_target_map(const char *target, bool user)
+struct map *get_target_map(const char *target, bool user)
{
/* Init maps of given executable or kernel */
if (user)
@@ -385,7 +387,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
if (uprobes)
address = sym->start;
else
- address = map->unmap_ip(map, sym->start);
+ address = map->unmap_ip(map, sym->start) - map->reloc;
break;
}
if (!address) {
@@ -664,22 +666,14 @@ static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
return ret;
}
-/* Post processing the probe events */
-static int post_process_probe_trace_events(struct probe_trace_event *tevs,
- int ntevs, const char *module,
- bool uprobe)
+static int
+post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs)
{
struct ref_reloc_sym *reloc_sym;
char *tmp;
int i, skipped = 0;
- if (uprobe)
- return add_exec_to_probe_trace_events(tevs, ntevs, module);
-
- /* Note that currently ref_reloc_sym based probe is not for drivers */
- if (module)
- return add_module_to_probe_trace_events(tevs, ntevs, module);
-
reloc_sym = kernel_get_ref_reloc_sym();
if (!reloc_sym) {
pr_warning("Relocated base symbol is not found!\n");
@@ -711,6 +705,34 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
return skipped;
}
+void __weak
+arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused,
+ int ntevs __maybe_unused)
+{
+}
+
+/* Post processing the probe events */
+static int post_process_probe_trace_events(struct perf_probe_event *pev,
+ struct probe_trace_event *tevs,
+ int ntevs, const char *module,
+ bool uprobe)
+{
+ int ret;
+
+ if (uprobe)
+ ret = add_exec_to_probe_trace_events(tevs, ntevs, module);
+ else if (module)
+ /* Currently ref_reloc_sym based probe is not for drivers */
+ ret = add_module_to_probe_trace_events(tevs, ntevs, module);
+ else
+ ret = post_process_kernel_probe_trace_events(tevs, ntevs);
+
+ if (ret >= 0)
+ arch__post_process_probe_trace_events(pev, ntevs);
+
+ return ret;
+}
+
/* Try to find perf_probe_event with debuginfo */
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
struct probe_trace_event **tevs)
@@ -749,7 +771,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
if (ntevs > 0) { /* Succeeded to find trace events */
pr_debug("Found %d probe_trace_events.\n", ntevs);
- ret = post_process_probe_trace_events(*tevs, ntevs,
+ ret = post_process_probe_trace_events(pev, *tevs, ntevs,
pev->target, pev->uprobes);
if (ret < 0 || ret == ntevs) {
clear_probe_trace_events(*tevs, ntevs);
@@ -2936,8 +2958,6 @@ errout:
return err;
}
-bool __weak arch__prefers_symtab(void) { return false; }
-
/* Concatinate two arrays */
static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b)
{
@@ -3158,12 +3178,6 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */
return ret == 0 ? -ENOENT : ret; /* Found in probe cache */
- if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
- ret = find_probe_trace_events_from_map(pev, tevs);
- if (ret > 0)
- return ret; /* Found in symbol table */
- }
-
/* Convert perf_probe_event with debuginfo */
ret = try_to_find_probe_trace_events(pev, tevs);
if (ret != 0)
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index e18ea9fe6385..f4f45db77c1c 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -158,7 +158,6 @@ int show_line_range(struct line_range *lr, const char *module, bool user);
int show_available_vars(struct perf_probe_event *pevs, int npevs,
struct strfilter *filter);
int show_available_funcs(const char *module, struct strfilter *filter, bool user);
-bool arch__prefers_symtab(void);
void arch__fix_tev_from_maps(struct perf_probe_event *pev,
struct probe_trace_event *tev, struct map *map,
struct symbol *sym);
@@ -173,4 +172,9 @@ int e_snprintf(char *str, size_t size, const char *format, ...)
int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
struct perf_probe_arg *pvar);
+struct map *get_target_map(const char *target, bool user);
+
+void arch__post_process_probe_trace_events(struct perf_probe_event *pev,
+ int ntevs);
+
#endif /*_PROBE_EVENT_H */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index f2d9ff064e2d..5c290c682afe 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -297,10 +297,13 @@ static int convert_variable_type(Dwarf_Die *vr_die,
char sbuf[STRERR_BUFSIZE];
int bsize, boffs, total;
int ret;
+ char sign;
/* TODO: check all types */
- if (cast && strcmp(cast, "string") != 0) {
+ if (cast && strcmp(cast, "string") != 0 &&
+ strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) {
/* Non string type is OK */
+ /* and respect signedness cast */
tvar->type = strdup(cast);
return (tvar->type == NULL) ? -ENOMEM : 0;
}
@@ -361,6 +364,13 @@ static int convert_variable_type(Dwarf_Die *vr_die,
return (tvar->type == NULL) ? -ENOMEM : 0;
}
+ if (cast && (strcmp(cast, "u") == 0))
+ sign = 'u';
+ else if (cast && (strcmp(cast, "s") == 0))
+ sign = 's';
+ else
+ sign = die_is_signed_type(&type) ? 's' : 'u';
+
ret = dwarf_bytesize(&type);
if (ret <= 0)
/* No size ... try to use default type */
@@ -373,8 +383,7 @@ static int convert_variable_type(Dwarf_Die *vr_die,
dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
ret = MAX_BASIC_TYPE_BITS;
}
- ret = snprintf(buf, 16, "%c%d",
- die_is_signed_type(&type) ? 's' : 'u', ret);
+ ret = snprintf(buf, 16, "%c%d", sign, ret);
formatted:
if (ret < 0 || ret >= 16) {
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 947d21f38398..3d3cb8392c86 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -588,7 +588,11 @@ static char *get_trace_output(struct hist_entry *he)
} else {
pevent_event_info(&seq, evsel->tp_format, &rec);
}
- return seq.buffer;
+ /*
+ * Trim the buffer, it starts at 4KB and we're not going to
+ * add anything more to this buffer.
+ */
+ return realloc(seq.buffer, seq.len + 1);
}
static int64_t
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