linux/tools/perf/util/trace-event-parse.c
Ian Rogers 378ef0f5d9 perf build: Use libtraceevent from the system
Remove the LIBTRACEEVENT_DYNAMIC and LIBTRACEFS_DYNAMIC make command
line variables.

If libtraceevent isn't installed or NO_LIBTRACEEVENT=1 is passed to the
build, don't compile in libtraceevent and libtracefs support.

This also disables CONFIG_TRACE that controls "perf trace".

CONFIG_LIBTRACEEVENT is used to control enablement in Build/Makefiles,
HAVE_LIBTRACEEVENT is used in C code.

Without HAVE_LIBTRACEEVENT tracepoints are disabled and as such the
commands kmem, kwork, lock, sched and timechart are removed.  The
majority of commands continue to work including "perf test".

Committer notes:

Fixed up a tools/perf/util/Build reject and added:

  #include <traceevent/event-parse.h>

to tools/perf/util/scripting-engines/trace-event-perl.c.

Committer testing:

  $ rpm -qi libtraceevent-devel
  Name        : libtraceevent-devel
  Version     : 1.5.3
  Release     : 2.fc36
  Architecture: x86_64
  Install Date: Mon 25 Jul 2022 03:20:19 PM -03
  Group       : Unspecified
  Size        : 27728
  License     : LGPLv2+ and GPLv2+
  Signature   : RSA/SHA256, Fri 15 Apr 2022 02:11:58 PM -03, Key ID 999f7cbf38ab71f4
  Source RPM  : libtraceevent-1.5.3-2.fc36.src.rpm
  Build Date  : Fri 15 Apr 2022 10:57:01 AM -03
  Build Host  : buildvm-x86-05.iad2.fedoraproject.org
  Packager    : Fedora Project
  Vendor      : Fedora Project
  URL         : https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
  Bug URL     : https://bugz.fedoraproject.org/libtraceevent
  Summary     : Development headers of libtraceevent
  Description :
  Development headers of libtraceevent-libs
  $

Default build:

  $ ldd ~/bin/perf | grep tracee
  	libtraceevent.so.1 => /lib64/libtraceevent.so.1 (0x00007f1dcaf8f000)
  $

  # perf trace -e sched:* --max-events 10
       0.000 migration/0/17 sched:sched_migrate_task(comm: "", pid: 1603763 (perf), prio: 120, dest_cpu: 1)
       0.005 migration/0/17 sched:sched_wake_idle_without_ipi(cpu: 1)
       0.011 migration/0/17 sched:sched_switch(prev_comm: "", prev_pid: 17 (migration/0), prev_state: 1, next_comm: "", next_prio: 120)
       1.173 :0/0 sched:sched_wakeup(comm: "", pid: 3138 (gnome-terminal-), prio: 120)
       1.180 :0/0 sched:sched_switch(prev_comm: "", prev_prio: 120, next_comm: "", next_pid: 3138 (gnome-terminal-), next_prio: 120)
       0.156 migration/1/21 sched:sched_migrate_task(comm: "", pid: 1603763 (perf), prio: 120, orig_cpu: 1, dest_cpu: 2)
       0.160 migration/1/21 sched:sched_wake_idle_without_ipi(cpu: 2)
       0.166 migration/1/21 sched:sched_switch(prev_comm: "", prev_pid: 21 (migration/1), prev_state: 1, next_comm: "", next_prio: 120)
       1.183 :0/0 sched:sched_wakeup(comm: "", pid: 1602985 (kworker/u16:0-f), prio: 120, target_cpu: 1)
       1.186 :0/0 sched:sched_switch(prev_comm: "", prev_prio: 120, next_comm: "", next_pid: 1602985 (kworker/u16:0-f), next_prio: 120)
  #

Had to tweak tools/perf/util/setup.py to make sure the python binding
shared object links with libtraceevent if -DHAVE_LIBTRACEEVENT is
present in CFLAGS.

Building with NO_LIBTRACEEVENT=1 uncovered some more build failures:

- Make building of data-convert-bt.c to CONFIG_LIBTRACEEVENT=y

- perf-$(CONFIG_LIBTRACEEVENT) += scripts/

- bpf_kwork.o needs also to be dependent on CONFIG_LIBTRACEEVENT=y

- The python binding needed some fixups and util/trace-event.c can't be
  built and linked with the python binding shared object, so remove it
  in tools/perf/util/setup.py and exclude it from the list of
  dependencies in the python/perf.so Makefile.perf target.

Building without libtraceevent-devel installed uncovered more build
failures:

- The python binding tools/perf/util/python.c was assuming that
  traceevent/parse-events.h was always available, which was the case
  when we defaulted to using the in-kernel tools/lib/traceevent/ files,
  now we need to enclose it under ifdef HAVE_LIBTRACEEVENT, just like
  the other parts of it that deal with tracepoints.

- We have to ifdef the rules in the Build files with
  CONFIG_LIBTRACEEVENT=y to build builtin-trace.c and
  tools/perf/trace/beauty/ as we only ifdef setting CONFIG_TRACE=y when
  setting NO_LIBTRACEEVENT=1 in the make command line, not when we don't
  detect libtraceevent-devel installed in the system. Simplification here
  to avoid these two ways of disabling builtin-trace.c and not having
  CONFIG_TRACE=y when libtraceevent-devel isn't installed is the clean
  way.

From Athira:

<quote>
tools/perf/arch/powerpc/util/Build
-perf-y += kvm-stat.o
+perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
</quote>

Then, ditto for arm64 and s390, detected by container cross build tests.

- s/390 uses test__checkevent_tracepoint() that is now only available if
  HAVE_LIBTRACEEVENT is defined, enclose the callsite with ifder HAVE_LIBTRACEEVENT.

Also from Athira:

<quote>
With this change, I could successfully compile in these environment:
- Without libtraceevent-devel installed
- With libtraceevent-devel installed
- With “make NO_LIBTRACEEVENT=1”
</quote>

Then, finally rename CONFIG_TRACEEVENT to CONFIG_LIBTRACEEVENT for
consistency with other libraries detected in tools/perf/.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: bpf@vger.kernel.org
Link: http://lore.kernel.org/lkml/20221205225940.3079667-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2022-12-14 11:16:12 -03:00

217 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "debug.h"
#include "trace-event.h"
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <traceevent/event-parse.h>
static int get_common_field(struct scripting_context *context,
int *offset, int *size, const char *type)
{
struct tep_handle *pevent = context->pevent;
struct tep_event *event;
struct tep_format_field *field;
if (!*size) {
event = tep_get_first_event(pevent);
if (!event)
return 0;
field = tep_find_common_field(event, type);
if (!field)
return 0;
*offset = field->offset;
*size = field->size;
}
return tep_read_number(pevent, context->event_data + *offset, *size);
}
int common_lock_depth(struct scripting_context *context)
{
static int offset;
static int size;
int ret;
ret = get_common_field(context, &size, &offset,
"common_lock_depth");
if (ret < 0)
return -1;
return ret;
}
int common_flags(struct scripting_context *context)
{
static int offset;
static int size;
int ret;
ret = get_common_field(context, &size, &offset,
"common_flags");
if (ret < 0)
return -1;
return ret;
}
int common_pc(struct scripting_context *context)
{
static int offset;
static int size;
int ret;
ret = get_common_field(context, &size, &offset,
"common_preempt_count");
if (ret < 0)
return -1;
return ret;
}
unsigned long long
raw_field_value(struct tep_event *event, const char *name, void *data)
{
struct tep_format_field *field;
unsigned long long val;
field = tep_find_any_field(event, name);
if (!field)
return 0ULL;
tep_read_number_field(field, data, &val);
return val;
}
unsigned long long read_size(struct tep_event *event, void *ptr, int size)
{
return tep_read_number(event->tep, ptr, size);
}
void event_format__fprintf(struct tep_event *event,
int cpu, void *data, int size, FILE *fp)
{
struct tep_record record;
struct trace_seq s;
memset(&record, 0, sizeof(record));
record.cpu = cpu;
record.size = size;
record.data = data;
trace_seq_init(&s);
tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);
trace_seq_do_fprintf(&s, fp);
trace_seq_destroy(&s);
}
void event_format__print(struct tep_event *event,
int cpu, void *data, int size)
{
return event_format__fprintf(event, cpu, data, size, stdout);
}
void parse_ftrace_printk(struct tep_handle *pevent,
char *file, unsigned int size __maybe_unused)
{
unsigned long long addr;
char *printk;
char *line;
char *next = NULL;
char *addr_str;
char *fmt = NULL;
line = strtok_r(file, "\n", &next);
while (line) {
addr_str = strtok_r(line, ":", &fmt);
if (!addr_str) {
pr_warning("printk format with empty entry");
break;
}
addr = strtoull(addr_str, NULL, 16);
/* fmt still has a space, skip it */
printk = strdup(fmt+1);
line = strtok_r(NULL, "\n", &next);
tep_register_print_string(pevent, printk, addr);
free(printk);
}
}
void parse_saved_cmdline(struct tep_handle *pevent,
char *file, unsigned int size __maybe_unused)
{
char comm[17]; /* Max comm length in the kernel is 16. */
char *line;
char *next = NULL;
int pid;
line = strtok_r(file, "\n", &next);
while (line) {
if (sscanf(line, "%d %16s", &pid, comm) == 2)
tep_register_comm(pevent, comm, pid);
line = strtok_r(NULL, "\n", &next);
}
}
int parse_ftrace_file(struct tep_handle *pevent, char *buf, unsigned long size)
{
return tep_parse_event(pevent, buf, size, "ftrace");
}
int parse_event_file(struct tep_handle *pevent,
char *buf, unsigned long size, char *sys)
{
return tep_parse_event(pevent, buf, size, sys);
}
struct flag {
const char *name;
unsigned long long value;
};
static const struct flag flags[] = {
{ "HI_SOFTIRQ", 0 },
{ "TIMER_SOFTIRQ", 1 },
{ "NET_TX_SOFTIRQ", 2 },
{ "NET_RX_SOFTIRQ", 3 },
{ "BLOCK_SOFTIRQ", 4 },
{ "IRQ_POLL_SOFTIRQ", 5 },
{ "TASKLET_SOFTIRQ", 6 },
{ "SCHED_SOFTIRQ", 7 },
{ "HRTIMER_SOFTIRQ", 8 },
{ "RCU_SOFTIRQ", 9 },
{ "HRTIMER_NORESTART", 0 },
{ "HRTIMER_RESTART", 1 },
};
unsigned long long eval_flag(const char *flag)
{
int i;
/*
* Some flags in the format files do not get converted.
* If the flag is not numeric, see if it is something that
* we already know about.
*/
if (isdigit(flag[0]))
return strtoull(flag, NULL, 0);
for (i = 0; i < (int)(ARRAY_SIZE(flags)); i++)
if (strcmp(flags[i].name, flag) == 0)
return flags[i].value;
return 0;
}