linux/tools/perf/util/header.c
Stephane Eranian a1ac1d3c08 perf record: Add option to avoid updating buildid cache
There are situations where there is enough information in the perf.data
to process the samples. Updating the buildid cache may add unecessary
overhead in terms of disk space and time (copying large elf images).

A persistent option to do this already exists via the perfconfig file,
simply do:

[buildid]
dir = /dev/null

This patch provides a way to suppress builid cache updates on a per-run
basis.  It addds a new option, -N, to perf record. Buildids are still
generated in the perf.data file.

Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4c19ef89.93ecd80a.40dc.fffff8e9@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-06-17 10:20:44 -03:00

1200 lines
27 KiB
C

#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <byteswap.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include "util.h"
#include "header.h"
#include "../perf.h"
#include "trace-event.h"
#include "session.h"
#include "symbol.h"
#include "debug.h"
static bool no_buildid_cache = false;
/*
* Create new perf.data header attribute:
*/
struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
{
struct perf_header_attr *self = malloc(sizeof(*self));
if (self != NULL) {
self->attr = *attr;
self->ids = 0;
self->size = 1;
self->id = malloc(sizeof(u64));
if (self->id == NULL) {
free(self);
self = NULL;
}
}
return self;
}
void perf_header_attr__delete(struct perf_header_attr *self)
{
free(self->id);
free(self);
}
int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
{
int pos = self->ids;
self->ids++;
if (self->ids > self->size) {
int nsize = self->size * 2;
u64 *nid = realloc(self->id, nsize * sizeof(u64));
if (nid == NULL)
return -1;
self->size = nsize;
self->id = nid;
}
self->id[pos] = id;
return 0;
}
int perf_header__init(struct perf_header *self)
{
self->size = 1;
self->attr = malloc(sizeof(void *));
return self->attr == NULL ? -ENOMEM : 0;
}
void perf_header__exit(struct perf_header *self)
{
int i;
for (i = 0; i < self->attrs; ++i)
perf_header_attr__delete(self->attr[i]);
free(self->attr);
}
int perf_header__add_attr(struct perf_header *self,
struct perf_header_attr *attr)
{
if (self->frozen)
return -1;
if (self->attrs == self->size) {
int nsize = self->size * 2;
struct perf_header_attr **nattr;
nattr = realloc(self->attr, nsize * sizeof(void *));
if (nattr == NULL)
return -1;
self->size = nsize;
self->attr = nattr;
}
self->attr[self->attrs++] = attr;
return 0;
}
static int event_count;
static struct perf_trace_event_type *events;
int perf_header__push_event(u64 id, const char *name)
{
if (strlen(name) > MAX_EVENT_NAME)
pr_warning("Event %s will be truncated\n", name);
if (!events) {
events = malloc(sizeof(struct perf_trace_event_type));
if (events == NULL)
return -ENOMEM;
} else {
struct perf_trace_event_type *nevents;
nevents = realloc(events, (event_count + 1) * sizeof(*events));
if (nevents == NULL)
return -ENOMEM;
events = nevents;
}
memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
events[event_count].event_id = id;
strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
event_count++;
return 0;
}
char *perf_header__find_event(u64 id)
{
int i;
for (i = 0 ; i < event_count; i++) {
if (events[i].event_id == id)
return events[i].name;
}
return NULL;
}
static const char *__perf_magic = "PERFFILE";
#define PERF_MAGIC (*(u64 *)__perf_magic)
struct perf_file_attr {
struct perf_event_attr attr;
struct perf_file_section ids;
};
void perf_header__set_feat(struct perf_header *self, int feat)
{
set_bit(feat, self->adds_features);
}
bool perf_header__has_feat(const struct perf_header *self, int feat)
{
return test_bit(feat, self->adds_features);
}
static int do_write(int fd, const void *buf, size_t size)
{
while (size) {
int ret = write(fd, buf, size);
if (ret < 0)
return -errno;
size -= ret;
buf += ret;
}
return 0;
}
#define NAME_ALIGN 64
static int write_padded(int fd, const void *bf, size_t count,
size_t count_aligned)
{
static const char zero_buf[NAME_ALIGN];
int err = do_write(fd, bf, count);
if (!err)
err = do_write(fd, zero_buf, count_aligned - count);
return err;
}
#define dsos__for_each_with_build_id(pos, head) \
list_for_each_entry(pos, head, node) \
if (!pos->has_build_id) \
continue; \
else
static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
u16 misc, int fd)
{
struct dso *pos;
dsos__for_each_with_build_id(pos, head) {
int err;
struct build_id_event b;
size_t len;
if (!pos->hit)
continue;
len = pos->long_name_len + 1;
len = ALIGN(len, NAME_ALIGN);
memset(&b, 0, sizeof(b));
memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
b.pid = pid;
b.header.misc = misc;
b.header.size = sizeof(b) + len;
err = do_write(fd, &b, sizeof(b));
if (err < 0)
return err;
err = write_padded(fd, pos->long_name,
pos->long_name_len + 1, len);
if (err < 0)
return err;
}
return 0;
}
static int machine__write_buildid_table(struct machine *self, int fd)
{
int err;
u16 kmisc = PERF_RECORD_MISC_KERNEL,
umisc = PERF_RECORD_MISC_USER;
if (!machine__is_host(self)) {
kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
umisc = PERF_RECORD_MISC_GUEST_USER;
}
err = __dsos__write_buildid_table(&self->kernel_dsos, self->pid,
kmisc, fd);
if (err == 0)
err = __dsos__write_buildid_table(&self->user_dsos,
self->pid, umisc, fd);
return err;
}
static int dsos__write_buildid_table(struct perf_header *header, int fd)
{
struct perf_session *session = container_of(header,
struct perf_session, header);
struct rb_node *nd;
int err = machine__write_buildid_table(&session->host_machine, fd);
if (err)
return err;
for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
err = machine__write_buildid_table(pos, fd);
if (err)
break;
}
return err;
}
int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
*linkname = malloc(size), *targetname;
int len, err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
len = snprintf(filename, size, "%s%s%s",
debugdir, is_kallsyms ? "/" : "", name);
if (mkdir_p(filename, 0755))
goto out_free;
snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
if (access(filename, F_OK)) {
if (is_kallsyms) {
if (copyfile("/proc/kallsyms", filename))
goto out_free;
} else if (link(name, filename) && copyfile(name, filename))
goto out_free;
}
len = snprintf(linkname, size, "%s/.build-id/%.2s",
debugdir, sbuild_id);
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
goto out_free;
snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
targetname = filename + strlen(debugdir) - 5;
memcpy(targetname, "../..", 5);
if (symlink(targetname, linkname) == 0)
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
const char *name, const char *debugdir,
bool is_kallsyms)
{
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
build_id__sprintf(build_id, build_id_size, sbuild_id);
return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
}
int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
*linkname = malloc(size);
int err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
snprintf(linkname, size, "%s/.build-id/%.2s/%s",
debugdir, sbuild_id, sbuild_id + 2);
if (access(linkname, F_OK))
goto out_free;
if (readlink(linkname, filename, size) < 0)
goto out_free;
if (unlink(linkname))
goto out_free;
/*
* Since the link is relative, we must make it absolute:
*/
snprintf(linkname, size, "%s/.build-id/%.2s/%s",
debugdir, sbuild_id, filename);
if (unlink(linkname))
goto out_free;
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int dso__cache_build_id(struct dso *self, const char *debugdir)
{
bool is_kallsyms = self->kernel && self->long_name[0] != '/';
return build_id_cache__add_b(self->build_id, sizeof(self->build_id),
self->long_name, debugdir, is_kallsyms);
}
static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
{
struct dso *pos;
int err = 0;
dsos__for_each_with_build_id(pos, head)
if (dso__cache_build_id(pos, debugdir))
err = -1;
return err;
}
static int machine__cache_build_ids(struct machine *self, const char *debugdir)
{
int ret = __dsos__cache_build_ids(&self->kernel_dsos, debugdir);
ret |= __dsos__cache_build_ids(&self->user_dsos, debugdir);
return ret;
}
static int perf_session__cache_build_ids(struct perf_session *self)
{
struct rb_node *nd;
int ret;
char debugdir[PATH_MAX];
snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
return -1;
ret = machine__cache_build_ids(&self->host_machine, debugdir);
for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
ret |= machine__cache_build_ids(pos, debugdir);
}
return ret ? -1 : 0;
}
static bool machine__read_build_ids(struct machine *self, bool with_hits)
{
bool ret = __dsos__read_build_ids(&self->kernel_dsos, with_hits);
ret |= __dsos__read_build_ids(&self->user_dsos, with_hits);
return ret;
}
static bool perf_session__read_build_ids(struct perf_session *self, bool with_hits)
{
struct rb_node *nd;
bool ret = machine__read_build_ids(&self->host_machine, with_hits);
for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
ret |= machine__read_build_ids(pos, with_hits);
}
return ret;
}
static int perf_header__adds_write(struct perf_header *self, int fd)
{
int nr_sections;
struct perf_session *session;
struct perf_file_section *feat_sec;
int sec_size;
u64 sec_start;
int idx = 0, err;
session = container_of(self, struct perf_session, header);
if (perf_session__read_build_ids(session, true))
perf_header__set_feat(self, HEADER_BUILD_ID);
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = calloc(sizeof(*feat_sec), nr_sections);
if (feat_sec == NULL)
return -ENOMEM;
sec_size = sizeof(*feat_sec) * nr_sections;
sec_start = self->data_offset + self->data_size;
lseek(fd, sec_start + sec_size, SEEK_SET);
if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
struct perf_file_section *trace_sec;
trace_sec = &feat_sec[idx++];
/* Write trace info */
trace_sec->offset = lseek(fd, 0, SEEK_CUR);
read_tracing_data(fd, attrs, nr_counters);
trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
}
if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
struct perf_file_section *buildid_sec;
buildid_sec = &feat_sec[idx++];
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
err = dsos__write_buildid_table(self, fd);
if (err < 0) {
pr_debug("failed to write buildid table\n");
goto out_free;
}
buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
buildid_sec->offset;
if (!no_buildid_cache)
perf_session__cache_build_ids(session);
}
lseek(fd, sec_start, SEEK_SET);
err = do_write(fd, feat_sec, sec_size);
if (err < 0)
pr_debug("failed to write feature section\n");
out_free:
free(feat_sec);
return err;
}
int perf_header__write_pipe(int fd)
{
struct perf_pipe_file_header f_header;
int err;
f_header = (struct perf_pipe_file_header){
.magic = PERF_MAGIC,
.size = sizeof(f_header),
};
err = do_write(fd, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf pipe header\n");
return err;
}
return 0;
}
int perf_header__write(struct perf_header *self, int fd, bool at_exit)
{
struct perf_file_header f_header;
struct perf_file_attr f_attr;
struct perf_header_attr *attr;
int i, err;
lseek(fd, sizeof(f_header), SEEK_SET);
for (i = 0; i < self->attrs; i++) {
attr = self->attr[i];
attr->id_offset = lseek(fd, 0, SEEK_CUR);
err = do_write(fd, attr->id, attr->ids * sizeof(u64));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
}
self->attr_offset = lseek(fd, 0, SEEK_CUR);
for (i = 0; i < self->attrs; i++) {
attr = self->attr[i];
f_attr = (struct perf_file_attr){
.attr = attr->attr,
.ids = {
.offset = attr->id_offset,
.size = attr->ids * sizeof(u64),
}
};
err = do_write(fd, &f_attr, sizeof(f_attr));
if (err < 0) {
pr_debug("failed to write perf header attribute\n");
return err;
}
}
self->event_offset = lseek(fd, 0, SEEK_CUR);
self->event_size = event_count * sizeof(struct perf_trace_event_type);
if (events) {
err = do_write(fd, events, self->event_size);
if (err < 0) {
pr_debug("failed to write perf header events\n");
return err;
}
}
self->data_offset = lseek(fd, 0, SEEK_CUR);
if (at_exit) {
err = perf_header__adds_write(self, fd);
if (err < 0)
return err;
}
f_header = (struct perf_file_header){
.magic = PERF_MAGIC,
.size = sizeof(f_header),
.attr_size = sizeof(f_attr),
.attrs = {
.offset = self->attr_offset,
.size = self->attrs * sizeof(f_attr),
},
.data = {
.offset = self->data_offset,
.size = self->data_size,
},
.event_types = {
.offset = self->event_offset,
.size = self->event_size,
},
};
memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
lseek(fd, 0, SEEK_SET);
err = do_write(fd, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
lseek(fd, self->data_offset + self->data_size, SEEK_SET);
self->frozen = 1;
return 0;
}
static int perf_header__getbuffer64(struct perf_header *self,
int fd, void *buf, size_t size)
{
if (do_read(fd, buf, size) <= 0)
return -1;
if (self->needs_swap)
mem_bswap_64(buf, size);
return 0;
}
int perf_header__process_sections(struct perf_header *self, int fd,
int (*process)(struct perf_file_section *self,
struct perf_header *ph,
int feat, int fd))
{
struct perf_file_section *feat_sec;
int nr_sections;
int sec_size;
int idx = 0;
int err = -1, feat = 1;
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = calloc(sizeof(*feat_sec), nr_sections);
if (!feat_sec)
return -1;
sec_size = sizeof(*feat_sec) * nr_sections;
lseek(fd, self->data_offset + self->data_size, SEEK_SET);
if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
goto out_free;
err = 0;
while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
if (perf_header__has_feat(self, feat)) {
struct perf_file_section *sec = &feat_sec[idx++];
err = process(sec, self, feat, fd);
if (err < 0)
break;
}
++feat;
}
out_free:
free(feat_sec);
return err;
}
int perf_file_header__read(struct perf_file_header *self,
struct perf_header *ph, int fd)
{
lseek(fd, 0, SEEK_SET);
if (do_read(fd, self, sizeof(*self)) <= 0 ||
memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
return -1;
if (self->attr_size != sizeof(struct perf_file_attr)) {
u64 attr_size = bswap_64(self->attr_size);
if (attr_size != sizeof(struct perf_file_attr))
return -1;
mem_bswap_64(self, offsetof(struct perf_file_header,
adds_features));
ph->needs_swap = true;
}
if (self->size != sizeof(*self)) {
/* Support the previous format */
if (self->size == offsetof(typeof(*self), adds_features))
bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
else
return -1;
}
memcpy(&ph->adds_features, &self->adds_features,
sizeof(ph->adds_features));
/*
* FIXME: hack that assumes that if we need swap the perf.data file
* may be coming from an arch with a different word-size, ergo different
* DEFINE_BITMAP format, investigate more later, but for now its mostly
* safe to assume that we have a build-id section. Trace files probably
* have several other issues in this realm anyway...
*/
if (ph->needs_swap) {
memset(&ph->adds_features, 0, sizeof(ph->adds_features));
perf_header__set_feat(ph, HEADER_BUILD_ID);
}
ph->event_offset = self->event_types.offset;
ph->event_size = self->event_types.size;
ph->data_offset = self->data.offset;
ph->data_size = self->data.size;
return 0;
}
static int __event_process_build_id(struct build_id_event *bev,
char *filename,
struct perf_session *session)
{
int err = -1;
struct list_head *head;
struct machine *machine;
u16 misc;
struct dso *dso;
enum dso_kernel_type dso_type;
machine = perf_session__findnew_machine(session, bev->pid);
if (!machine)
goto out;
misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
switch (misc) {
case PERF_RECORD_MISC_KERNEL:
dso_type = DSO_TYPE_KERNEL;
head = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
dso_type = DSO_TYPE_GUEST_KERNEL;
head = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_USER:
case PERF_RECORD_MISC_GUEST_USER:
dso_type = DSO_TYPE_USER;
head = &machine->user_dsos;
break;
default:
goto out;
}
dso = __dsos__findnew(head, filename);
if (dso != NULL) {
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
dso__set_build_id(dso, &bev->build_id);
if (filename[0] == '[')
dso->kernel = dso_type;
build_id__sprintf(dso->build_id, sizeof(dso->build_id),
sbuild_id);
pr_debug("build id event received for %s: %s\n",
dso->long_name, sbuild_id);
}
err = 0;
out:
return err;
}
static int perf_header__read_build_ids(struct perf_header *self,
int input, u64 offset, u64 size)
{
struct perf_session *session = container_of(self,
struct perf_session, header);
struct build_id_event bev;
char filename[PATH_MAX];
u64 limit = offset + size;
int err = -1;
while (offset < limit) {
ssize_t len;
if (read(input, &bev, sizeof(bev)) != sizeof(bev))
goto out;
if (self->needs_swap)
perf_event_header__bswap(&bev.header);
len = bev.header.size - sizeof(bev);
if (read(input, filename, len) != len)
goto out;
__event_process_build_id(&bev, filename, session);
offset += bev.header.size;
}
err = 0;
out:
return err;
}
static int perf_file_section__process(struct perf_file_section *self,
struct perf_header *ph,
int feat, int fd)
{
if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
pr_debug("Failed to lseek to %Ld offset for feature %d, "
"continuing...\n", self->offset, feat);
return 0;
}
switch (feat) {
case HEADER_TRACE_INFO:
trace_report(fd, false);
break;
case HEADER_BUILD_ID:
if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
pr_debug("Failed to read buildids, continuing...\n");
break;
default:
pr_debug("unknown feature %d, continuing...\n", feat);
}
return 0;
}
static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
struct perf_header *ph, int fd,
bool repipe)
{
if (do_read(fd, self, sizeof(*self)) <= 0 ||
memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
return -1;
if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
return -1;
if (self->size != sizeof(*self)) {
u64 size = bswap_64(self->size);
if (size != sizeof(*self))
return -1;
ph->needs_swap = true;
}
return 0;
}
static int perf_header__read_pipe(struct perf_session *session, int fd)
{
struct perf_header *self = &session->header;
struct perf_pipe_file_header f_header;
if (perf_file_header__read_pipe(&f_header, self, fd,
session->repipe) < 0) {
pr_debug("incompatible file format\n");
return -EINVAL;
}
session->fd = fd;
return 0;
}
int perf_header__read(struct perf_session *session, int fd)
{
struct perf_header *self = &session->header;
struct perf_file_header f_header;
struct perf_file_attr f_attr;
u64 f_id;
int nr_attrs, nr_ids, i, j;
if (session->fd_pipe)
return perf_header__read_pipe(session, fd);
if (perf_file_header__read(&f_header, self, fd) < 0) {
pr_debug("incompatible file format\n");
return -EINVAL;
}
nr_attrs = f_header.attrs.size / sizeof(f_attr);
lseek(fd, f_header.attrs.offset, SEEK_SET);
for (i = 0; i < nr_attrs; i++) {
struct perf_header_attr *attr;
off_t tmp;
if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
goto out_errno;
tmp = lseek(fd, 0, SEEK_CUR);
attr = perf_header_attr__new(&f_attr.attr);
if (attr == NULL)
return -ENOMEM;
nr_ids = f_attr.ids.size / sizeof(u64);
lseek(fd, f_attr.ids.offset, SEEK_SET);
for (j = 0; j < nr_ids; j++) {
if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
goto out_errno;
if (perf_header_attr__add_id(attr, f_id) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
}
if (perf_header__add_attr(self, attr) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
lseek(fd, tmp, SEEK_SET);
}
if (f_header.event_types.size) {
lseek(fd, f_header.event_types.offset, SEEK_SET);
events = malloc(f_header.event_types.size);
if (events == NULL)
return -ENOMEM;
if (perf_header__getbuffer64(self, fd, events,
f_header.event_types.size))
goto out_errno;
event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
}
perf_header__process_sections(self, fd, perf_file_section__process);
lseek(fd, self->data_offset, SEEK_SET);
self->frozen = 1;
return 0;
out_errno:
return -errno;
}
u64 perf_header__sample_type(struct perf_header *header)
{
u64 type = 0;
int i;
for (i = 0; i < header->attrs; i++) {
struct perf_header_attr *attr = header->attr[i];
if (!type)
type = attr->attr.sample_type;
else if (type != attr->attr.sample_type)
die("non matching sample_type");
}
return type;
}
struct perf_event_attr *
perf_header__find_attr(u64 id, struct perf_header *header)
{
int i;
/*
* We set id to -1 if the data file doesn't contain sample
* ids. Check for this and avoid walking through the entire
* list of ids which may be large.
*/
if (id == -1ULL)
return NULL;
for (i = 0; i < header->attrs; i++) {
struct perf_header_attr *attr = header->attr[i];
int j;
for (j = 0; j < attr->ids; j++) {
if (attr->id[j] == id)
return &attr->attr;
}
}
return NULL;
}
int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
event__handler_t process,
struct perf_session *session)
{
event_t *ev;
size_t size;
int err;
size = sizeof(struct perf_event_attr);
size = ALIGN(size, sizeof(u64));
size += sizeof(struct perf_event_header);
size += ids * sizeof(u64);
ev = malloc(size);
ev->attr.attr = *attr;
memcpy(ev->attr.id, id, ids * sizeof(u64));
ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
ev->attr.header.size = size;
err = process(ev, session);
free(ev);
return err;
}
int event__synthesize_attrs(struct perf_header *self,
event__handler_t process,
struct perf_session *session)
{
struct perf_header_attr *attr;
int i, err = 0;
for (i = 0; i < self->attrs; i++) {
attr = self->attr[i];
err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
process, session);
if (err) {
pr_debug("failed to create perf header attribute\n");
return err;
}
}
return err;
}
int event__process_attr(event_t *self, struct perf_session *session)
{
struct perf_header_attr *attr;
unsigned int i, ids, n_ids;
attr = perf_header_attr__new(&self->attr.attr);
if (attr == NULL)
return -ENOMEM;
ids = self->header.size;
ids -= (void *)&self->attr.id - (void *)self;
n_ids = ids / sizeof(u64);
for (i = 0; i < n_ids; i++) {
if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
}
if (perf_header__add_attr(&session->header, attr) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
perf_session__update_sample_type(session);
return 0;
}
int event__synthesize_event_type(u64 event_id, char *name,
event__handler_t process,
struct perf_session *session)
{
event_t ev;
size_t size = 0;
int err = 0;
memset(&ev, 0, sizeof(ev));
ev.event_type.event_type.event_id = event_id;
memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
size = strlen(name);
size = ALIGN(size, sizeof(u64));
ev.event_type.header.size = sizeof(ev.event_type) -
(sizeof(ev.event_type.event_type.name) - size);
err = process(&ev, session);
return err;
}
int event__synthesize_event_types(event__handler_t process,
struct perf_session *session)
{
struct perf_trace_event_type *type;
int i, err = 0;
for (i = 0; i < event_count; i++) {
type = &events[i];
err = event__synthesize_event_type(type->event_id, type->name,
process, session);
if (err) {
pr_debug("failed to create perf header event type\n");
return err;
}
}
return err;
}
int event__process_event_type(event_t *self,
struct perf_session *session __unused)
{
if (perf_header__push_event(self->event_type.event_type.event_id,
self->event_type.event_type.name) < 0)
return -ENOMEM;
return 0;
}
int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
int nb_events,
event__handler_t process,
struct perf_session *session __unused)
{
event_t ev;
ssize_t size = 0, aligned_size = 0, padding;
int err = 0;
memset(&ev, 0, sizeof(ev));
ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
size = read_tracing_data_size(fd, pattrs, nb_events);
if (size <= 0)
return size;
aligned_size = ALIGN(size, sizeof(u64));
padding = aligned_size - size;
ev.tracing_data.header.size = sizeof(ev.tracing_data);
ev.tracing_data.size = aligned_size;
process(&ev, session);
err = read_tracing_data(fd, pattrs, nb_events);
write_padded(fd, NULL, 0, padding);
return aligned_size;
}
int event__process_tracing_data(event_t *self,
struct perf_session *session)
{
ssize_t size_read, padding, size = self->tracing_data.size;
off_t offset = lseek(session->fd, 0, SEEK_CUR);
char buf[BUFSIZ];
/* setup for reading amidst mmap */
lseek(session->fd, offset + sizeof(struct tracing_data_event),
SEEK_SET);
size_read = trace_report(session->fd, session->repipe);
padding = ALIGN(size_read, sizeof(u64)) - size_read;
if (read(session->fd, buf, padding) < 0)
die("reading input file");
if (session->repipe) {
int retw = write(STDOUT_FILENO, buf, padding);
if (retw <= 0 || retw != padding)
die("repiping tracing data padding");
}
if (size_read + padding != size)
die("tracing data size mismatch");
return size_read + padding;
}
int event__synthesize_build_id(struct dso *pos, u16 misc,
event__handler_t process,
struct machine *machine,
struct perf_session *session)
{
event_t ev;
size_t len;
int err = 0;
if (!pos->hit)
return err;
memset(&ev, 0, sizeof(ev));
len = pos->long_name_len + 1;
len = ALIGN(len, NAME_ALIGN);
memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
ev.build_id.header.misc = misc;
ev.build_id.pid = machine->pid;
ev.build_id.header.size = sizeof(ev.build_id) + len;
memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
err = process(&ev, session);
return err;
}
int event__process_build_id(event_t *self,
struct perf_session *session)
{
__event_process_build_id(&self->build_id,
self->build_id.filename,
session);
return 0;
}
void disable_buildid_cache(void)
{
no_buildid_cache = true;
}