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perf: Add 'perf sched' tool

This turn-key tool allows scheduler measurements to be
conducted and the results be displayed numerically.

First baby step towards that goal: clone the new command off of
perf trace.

Fix a few other details along the way:

 - add (minimal) perf trace documentation

 - reorder a few places

 - list perf trace in the mainporcelain list as well
   as it's a very useful utility.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-09-11 12:12:54 +02:00
parent 86d710146f
commit 0a02ad9331
7 changed files with 354 additions and 2 deletions

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@ -0,0 +1,25 @@
perf-sched(1)
==============
NAME
----
perf-sched - Read perf.data (created by perf record) and display sched output
SYNOPSIS
--------
[verse]
'perf sched' [-i <file> | --input=file] symbol_name
DESCRIPTION
-----------
This command reads the input file and displays the latencies recorded.
OPTIONS
-------
-D::
--dump-raw-trace=::
Display verbose dump of the sched data.
SEE ALSO
--------
linkperf:perf-record[1]

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@ -0,0 +1,25 @@
perf-trace(1)
==============
NAME
----
perf-trace - Read perf.data (created by perf record) and display trace output
SYNOPSIS
--------
[verse]
'perf trace' [-i <file> | --input=file] symbol_name
DESCRIPTION
-----------
This command reads the input file and displays the trace recorded.
OPTIONS
-------
-D::
--dump-raw-trace=::
Display verbose dump of the trace data.
SEE ALSO
--------
linkperf:perf-record[1]

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@ -376,6 +376,7 @@ LIB_OBJS += util/trace-event-info.o
BUILTIN_OBJS += builtin-annotate.o
BUILTIN_OBJS += builtin-help.o
BUILTIN_OBJS += builtin-sched.o
BUILTIN_OBJS += builtin-list.o
BUILTIN_OBJS += builtin-record.o
BUILTIN_OBJS += builtin-report.o

297
tools/perf/builtin-sched.c Normal file
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@ -0,0 +1,297 @@
#include "builtin.h"
#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/parse-options.h"
#include "perf.h"
#include "util/debug.h"
#include "util/trace-event.h"
static char const *input_name = "perf.data";
static int input;
static unsigned long page_size;
static unsigned long mmap_window = 32;
static unsigned long total = 0;
static unsigned long total_comm = 0;
static struct rb_root threads;
static struct thread *last_match;
static struct perf_header *header;
static u64 sample_type;
static int
process_comm_event(event_t *event, unsigned long offset, unsigned long head)
{
struct thread *thread;
thread = threads__findnew(event->comm.pid, &threads, &last_match);
dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
(void *)(offset + head),
(void *)(long)(event->header.size),
event->comm.comm, event->comm.pid);
if (thread == NULL ||
thread__set_comm(thread, event->comm.comm)) {
dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
return -1;
}
total_comm++;
return 0;
}
static int
process_sample_event(event_t *event, unsigned long offset, unsigned long head)
{
char level;
int show = 0;
struct dso *dso = NULL;
struct thread *thread;
u64 ip = event->ip.ip;
u64 timestamp = -1;
u32 cpu = -1;
u64 period = 1;
void *more_data = event->ip.__more_data;
int cpumode;
thread = threads__findnew(event->ip.pid, &threads, &last_match);
if (sample_type & PERF_SAMPLE_TIME) {
timestamp = *(u64 *)more_data;
more_data += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_CPU) {
cpu = *(u32 *)more_data;
more_data += sizeof(u32);
more_data += sizeof(u32); /* reserved */
}
if (sample_type & PERF_SAMPLE_PERIOD) {
period = *(u64 *)more_data;
more_data += sizeof(u64);
}
dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
(void *)(offset + head),
(void *)(long)(event->header.size),
event->header.misc,
event->ip.pid, event->ip.tid,
(void *)(long)ip,
(long long)period);
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
if (thread == NULL) {
eprintf("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
if (cpumode == PERF_EVENT_MISC_KERNEL) {
show = SHOW_KERNEL;
level = 'k';
dso = kernel_dso;
dump_printf(" ...... dso: %s\n", dso->name);
} else if (cpumode == PERF_EVENT_MISC_USER) {
show = SHOW_USER;
level = '.';
} else {
show = SHOW_HV;
level = 'H';
dso = hypervisor_dso;
dump_printf(" ...... dso: [hypervisor]\n");
}
if (sample_type & PERF_SAMPLE_RAW) {
struct {
u32 size;
char data[0];
} *raw = more_data;
/*
* FIXME: better resolve from pid from the struct trace_entry
* field, although it should be the same than this perf
* event pid
*/
print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
}
total += period;
return 0;
}
static int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
trace_event(event);
switch (event->header.type) {
case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
return 0;
case PERF_EVENT_COMM:
return process_comm_event(event, offset, head);
case PERF_EVENT_EXIT ... PERF_EVENT_READ:
return 0;
case PERF_EVENT_SAMPLE:
return process_sample_event(event, offset, head);
case PERF_EVENT_MAX:
default:
return -1;
}
return 0;
}
static int __cmd_sched(void)
{
int ret, rc = EXIT_FAILURE;
unsigned long offset = 0;
unsigned long head = 0;
struct stat perf_stat;
event_t *event;
uint32_t size;
char *buf;
trace_report();
register_idle_thread(&threads, &last_match);
input = open(input_name, O_RDONLY);
if (input < 0) {
perror("failed to open file");
exit(-1);
}
ret = fstat(input, &perf_stat);
if (ret < 0) {
perror("failed to stat file");
exit(-1);
}
if (!perf_stat.st_size) {
fprintf(stderr, "zero-sized file, nothing to do!\n");
exit(0);
}
header = perf_header__read(input);
head = header->data_offset;
sample_type = perf_header__sample_type(header);
if (!(sample_type & PERF_SAMPLE_RAW))
die("No trace sample to read. Did you call perf record "
"without -R?");
if (load_kernel() < 0) {
perror("failed to load kernel symbols");
return EXIT_FAILURE;
}
remap:
buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
MAP_SHARED, input, offset);
if (buf == MAP_FAILED) {
perror("failed to mmap file");
exit(-1);
}
more:
event = (event_t *)(buf + head);
size = event->header.size;
if (!size)
size = 8;
if (head + event->header.size >= page_size * mmap_window) {
unsigned long shift = page_size * (head / page_size);
int res;
res = munmap(buf, page_size * mmap_window);
assert(res == 0);
offset += shift;
head -= shift;
goto remap;
}
size = event->header.size;
if (!size || process_event(event, offset, head) < 0) {
/*
* assume we lost track of the stream, check alignment, and
* increment a single u64 in the hope to catch on again 'soon'.
*/
if (unlikely(head & 7))
head &= ~7ULL;
size = 8;
}
head += size;
if (offset + head < (unsigned long)perf_stat.st_size)
goto more;
rc = EXIT_SUCCESS;
close(input);
return rc;
}
static const char * const annotate_usage[] = {
"perf trace [<options>] <command>",
NULL
};
static const struct option options[] = {
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_END()
};
int cmd_sched(int argc, const char **argv, const char *prefix __used)
{
symbol__init();
page_size = getpagesize();
argc = parse_options(argc, argv, options, annotate_usage, 0);
if (argc) {
/*
* Special case: if there's an argument left then assume tha
* it's a symbol filter:
*/
if (argc > 1)
usage_with_options(annotate_usage, options);
}
setup_pager();
return __cmd_sched();
}

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@ -16,12 +16,13 @@ extern int check_pager_config(const char *cmd);
extern int cmd_annotate(int argc, const char **argv, const char *prefix);
extern int cmd_help(int argc, const char **argv, const char *prefix);
extern int cmd_sched(int argc, const char **argv, const char *prefix);
extern int cmd_list(int argc, const char **argv, const char *prefix);
extern int cmd_record(int argc, const char **argv, const char *prefix);
extern int cmd_report(int argc, const char **argv, const char *prefix);
extern int cmd_stat(int argc, const char **argv, const char *prefix);
extern int cmd_top(int argc, const char **argv, const char *prefix);
extern int cmd_version(int argc, const char **argv, const char *prefix);
extern int cmd_list(int argc, const char **argv, const char *prefix);
extern int cmd_trace(int argc, const char **argv, const char *prefix);
extern int cmd_version(int argc, const char **argv, const char *prefix);
#endif

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@ -4,7 +4,9 @@
#
perf-annotate mainporcelain common
perf-list mainporcelain common
perf-sched mainporcelain common
perf-record mainporcelain common
perf-report mainporcelain common
perf-stat mainporcelain common
perf-top mainporcelain common
perf-trace mainporcelain common

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@ -293,6 +293,7 @@ static void handle_internal_command(int argc, const char **argv)
{ "annotate", cmd_annotate, 0 },
{ "version", cmd_version, 0 },
{ "trace", cmd_trace, 0 },
{ "sched", cmd_sched, 0 },
};
unsigned int i;
static const char ext[] = STRIP_EXTENSION;