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perf tools: Handle PERF_RECORD_KSYMBOL 

This patch handles PERF_RECORD_KSYMBOL in perf record/report.
Specifically, map and symbol are created for ksymbol register, and
removed for ksymbol unregister.

This patch also sets perf_event_attr.ksymbol properly. The flag is ON by
default.

Committer notes:

Use proper inttypes.h for u64, fixing the build in some environments
like in the android NDK r15c targetting ARM 32-bit.

I.e. fixing this build error:

  util/event.c: In function 'perf_event__fprintf_ksymbol':
  util/event.c:1489:10: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'u64' [-Werror=format=]
            event->ksymbol_event.flags, event->ksymbol_event.name);
            ^
  cc1: all warnings being treated as errors

Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-6-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Song Liu 2019-01-17 08:15:17 -08:00 committed by Arnaldo Carvalho de Melo
parent df063c83aa
commit 9aa0bfa370
8 changed files with 116 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
tools/perf/util/event.c
View File

@ -24,6 +24,7 @@
#include "symbol/kallsyms.h"
#include "asm/bug.h"
#include "stat.h"
#include "session.h"
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
@ -45,6 +46,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_SWITCH] = "SWITCH",
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
[PERF_RECORD_KSYMBOL] = "KSYMBOL",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@ -1329,6 +1331,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
return machine__process_switch_event(machine, event);
}
int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine)
{
return machine__process_ksymbol(machine, event, sample);
}
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@ -1461,6 +1471,14 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
}
size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
{
return fprintf(fp, " ksymbol event with addr %" PRIx64 " len %u type %u flags 0x%x name %s\n",
event->ksymbol_event.addr, event->ksymbol_event.len,
event->ksymbol_event.ksym_type,
event->ksymbol_event.flags, event->ksymbol_event.name);
}
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
@ -1496,6 +1514,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
case PERF_RECORD_LOST:
ret += perf_event__fprintf_lost(event, fp);
break;
case PERF_RECORD_KSYMBOL:
ret += perf_event__fprintf_ksymbol(event, fp);
break;
default:
ret += fprintf(fp, "\n");
}

20
tools/perf/util/event.h
View File

@ -5,6 +5,7 @@
#include <limits.h>
#include <stdio.h>
#include <linux/kernel.h>
#include <linux/bpf.h>
#include "../perf.h"
#include "build-id.h"
@ -84,6 +85,19 @@ struct throttle_event {
u64 stream_id;
};
#ifndef KSYM_NAME_LEN
#define KSYM_NAME_LEN 256
#endif
struct ksymbol_event {
struct perf_event_header header;
u64 addr;
u32 len;
u16 ksym_type;
u16 flags;
char name[KSYM_NAME_LEN];
};
#define PERF_SAMPLE_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
@ -651,6 +665,7 @@ union perf_event {
struct stat_round_event stat_round;
struct time_conv_event time_conv;
struct feature_event feat;
struct ksymbol_event ksymbol_event;
};
void perf_event__print_totals(void);
@ -748,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
int perf_event__process_ksymbol(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
@ -811,6 +830,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
size_t perf_event__fprintf(union perf_event *event, FILE *fp);
int kallsyms__get_function_start(const char *kallsyms_filename,

10
tools/perf/util/evsel.c
View File

@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
attr->mmap = track;
attr->mmap2 = track && !perf_missing_features.mmap2;
attr->comm = track;
attr->ksymbol = track && !perf_missing_features.ksymbol;
if (opts->record_namespaces)
attr->namespaces = track;
@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(context_switch, p_unsigned);
PRINT_ATTRf(write_backward, p_unsigned);
PRINT_ATTRf(namespaces, p_unsigned);
PRINT_ATTRf(ksymbol, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
@ -1811,6 +1813,8 @@ fallback_missing_features:
PERF_SAMPLE_BRANCH_NO_CYCLES);
if (perf_missing_features.group_read && evsel->attr.inherit)
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
if (perf_missing_features.ksymbol)
evsel->attr.ksymbol = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@ -1930,7 +1934,11 @@ try_fallback:
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
perf_missing_features.ksymbol = true;
pr_debug2("switching off ksymbol\n");
goto fallback_missing_features;
} else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
perf_missing_features.write_backward = true;
pr_debug2("switching off write_backward\n");
goto out_close;

1
tools/perf/util/evsel.h
View File

@ -168,6 +168,7 @@ struct perf_missing_features {
bool lbr_flags;
bool write_backward;
bool group_read;
bool ksymbol;
};
extern struct perf_missing_features perf_missing_features;

55
tools/perf/util/machine.c
View File

@ -681,6 +681,59 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
return 0;
}
static int machine__process_ksymbol_register(struct machine *machine,
union perf_event *event,
struct perf_sample *sample __maybe_unused)
{
struct symbol *sym;
struct map *map;
map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
if (!map) {
map = dso__new_map(event->ksymbol_event.name);
if (!map)
return -ENOMEM;
map->start = event->ksymbol_event.addr;
map->pgoff = map->start;
map->end = map->start + event->ksymbol_event.len;
map_groups__insert(&machine->kmaps, map);
}
sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
0, 0, event->ksymbol_event.name);
if (!sym)
return -ENOMEM;
dso__insert_symbol(map->dso, sym);
return 0;
}
static int machine__process_ksymbol_unregister(struct machine *machine,
union perf_event *event,
struct perf_sample *sample __maybe_unused)
{
struct map *map;
map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
if (map)
map_groups__remove(&machine->kmaps, map);
return 0;
}
int machine__process_ksymbol(struct machine *machine __maybe_unused,
union perf_event *event,
struct perf_sample *sample)
{
if (dump_trace)
perf_event__fprintf_ksymbol(event, stdout);
if (event->ksymbol_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
return machine__process_ksymbol_unregister(machine, event,
sample);
return machine__process_ksymbol_register(machine, event, sample);
}
static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
{
const char *dup_filename;
@ -1812,6 +1865,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
ret = machine__process_switch_event(machine, event); break;
case PERF_RECORD_KSYMBOL:
ret = machine__process_ksymbol(machine, event, sample); break;
default:
ret = -1;
break;

3
tools/perf/util/machine.h
View File

@ -130,6 +130,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
struct perf_sample *sample);
int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_ksymbol(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
int machine__process_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);

4
tools/perf/util/session.c
View File

@ -379,6 +379,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->itrace_start = perf_event__process_itrace_start;
if (tool->context_switch == NULL)
tool->context_switch = perf_event__process_switch;
if (tool->ksymbol == NULL)
tool->ksymbol = perf_event__process_ksymbol;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@ -1310,6 +1312,8 @@ static int machines__deliver_event(struct machines *machines,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
return tool->context_switch(tool, event, sample, machine);
case PERF_RECORD_KSYMBOL:
return tool->ksymbol(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;

4
tools/perf/util/tool.h
View File

@ -53,7 +53,9 @@ struct perf_tool {
itrace_start,
context_switch,
throttle,
unthrottle;
unthrottle,
ksymbol;
event_attr_op attr;
event_attr_op event_update;
event_op2 tracing_data;