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perf_counter tools: Add a data file header

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Add a data file header so we can transfer data between record and report.

LKML-Reference: <new-submission>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-18 23:22:55 +02:00 committed by Ingo Molnar
parent 2a0a50fe9d
commit f5970550d5
3 changed files with 73 additions and 43 deletions
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94
tools/perf/builtin-record.c
View file

@ -51,6 +51,9 @@ static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
static int nr_poll;
static int nr_cpu;
static int file_new = 1;
static struct perf_file_header file_header;
struct mmap_event {
struct perf_event_header header;
__u32 pid;
@ -100,6 +103,21 @@ static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
pc->data_tail = tail;
}
static void write_output(void *buf, size_t size)
{
while (size) {
int ret = write(output, buf, size);
if (ret < 0)
die("failed to write");
size -= ret;
buf += ret;
bytes_written += ret;
}
}
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
@ -148,34 +166,14 @@ static void mmap_read(struct mmap_data *md)
size = md->mask + 1 - (old & md->mask);
old += size;
while (size) {
int ret = write(output, buf, size);
if (ret < 0)
die("failed to write");
size -= ret;
buf += ret;
bytes_written += ret;
}
write_output(buf, size);
}
buf = &data[old & md->mask];
size = head - old;
old += size;
while (size) {
int ret = write(output, buf, size);
if (ret < 0)
die("failed to write");
size -= ret;
buf += ret;
bytes_written += ret;
}
write_output(buf, size);
md->prev = old;
mmap_write_tail(md, old);
@ -204,7 +202,7 @@ static void pid_synthesize_comm_event(pid_t pid, int full)
struct comm_event comm_ev;
char filename[PATH_MAX];
char bf[BUFSIZ];
int fd, ret;
int fd;
size_t size;
char *field, *sep;
DIR *tasks;
@ -246,11 +244,7 @@ static void pid_synthesize_comm_event(pid_t pid, int full)
if (!full) {
comm_ev.tid = pid;
ret = write(output, &comm_ev, comm_ev.header.size);
if (ret < 0) {
perror("failed to write");
exit(-1);
}
write_output(&comm_ev, comm_ev.header.size);
return;
}
@ -265,11 +259,7 @@ static void pid_synthesize_comm_event(pid_t pid, int full)
comm_ev.tid = pid;
ret = write(output, &comm_ev, comm_ev.header.size);
if (ret < 0) {
perror("failed to write");
exit(-1);
}
write_output(&comm_ev, comm_ev.header.size);
}
closedir(tasks);
return;
@ -332,10 +322,7 @@ static void pid_synthesize_mmap_samples(pid_t pid)
mmap_ev.pid = pid;
mmap_ev.tid = pid;
if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
perror("failed to write");
exit(-1);
}
write_output(&mmap_ev, mmap_ev.header.size);
}
}
@ -382,6 +369,15 @@ static void create_counter(int counter, int cpu, pid_t pid)
if (call_graph)
attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
if (file_new) {
file_header.sample_type = attr->sample_type;
} else {
if (file_header.sample_type != attr->sample_type) {
fprintf(stderr, "incompatible append\n");
exit(-1);
}
}
attr->mmap = track;
attr->comm = track;
attr->inherit = (cpu < 0) && inherit;
@ -461,6 +457,13 @@ static void open_counters(int cpu, pid_t pid)
nr_cpu++;
}
static void atexit_header(void)
{
file_header.data_size += bytes_written;
pwrite(output, &file_header, sizeof(file_header), 0);
}
static int __cmd_record(int argc, const char **argv)
{
int i, counter;
@ -474,6 +477,10 @@ static int __cmd_record(int argc, const char **argv)
assert(nr_cpus <= MAX_NR_CPUS);
assert(nr_cpus >= 0);
atexit(sig_atexit);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
if (!stat(output_name, &st) && !force && !append_file) {
fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
output_name);
@ -482,7 +489,7 @@ static int __cmd_record(int argc, const char **argv)
flags = O_CREAT|O_RDWR;
if (append_file)
flags |= O_APPEND;
file_new = 0;
else
flags |= O_TRUNC;
@ -492,15 +499,18 @@ static int __cmd_record(int argc, const char **argv)
exit(-1);
}
if (!file_new) {
read(output, &file_header, sizeof(file_header));
lseek(output, file_header.data_size, SEEK_CUR);
}
atexit(atexit_header);
if (!system_wide) {
open_counters(-1, target_pid != -1 ? target_pid : getpid());
} else for (i = 0; i < nr_cpus; i++)
open_counters(i, target_pid);
atexit(sig_atexit);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
if (target_pid == -1 && argc) {
pid = fork();
if (pid < 0)

16
tools/perf/builtin-report.c
View file

@ -1366,11 +1366,13 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
return 0;
}
static struct perf_file_header file_header;
static int __cmd_report(void)
{
int ret, rc = EXIT_FAILURE;
unsigned long offset = 0;
unsigned long head = 0;
unsigned long head = sizeof(file_header);
struct stat stat;
event_t *event;
uint32_t size;
@ -1398,6 +1400,14 @@ static int __cmd_report(void)
exit(0);
}
read(input, &file_header, sizeof(file_header));
if (sort__has_parent &&
!(file_header.sample_type & PERF_SAMPLE_CALLCHAIN)) {
fprintf(stderr, "selected --sort parent, but no callchain data\n");
exit(-1);
}
if (load_kernel() < 0) {
perror("failed to load kernel symbols");
return EXIT_FAILURE;
@ -1469,9 +1479,13 @@ more:
head += size;
if (offset + head >= sizeof(file_header) + file_header.data_size)
goto done;
if (offset + head < stat.st_size)
goto more;
done:
rc = EXIT_SUCCESS;
close(input);

6
tools/perf/perf.h
View file

@ -65,4 +65,10 @@ sys_perf_counter_open(struct perf_counter_attr *attr,
#define MAX_COUNTERS 256
#define MAX_NR_CPUS 256
struct perf_file_header {
__u64 version;
__u64 sample_type;
__u64 data_size;
};
#endif