kernel_optimize_test/tools/perf/util/data_map.c
Arnaldo Carvalho de Melo b32d133aec perf symbols: Simplify symbol machinery setup
And also express its configuration toggles via a struct.

Now all one has to do is to call symbol__init(NULL) if the
defaults are OK, or pass a struct symbol_conf pointer with the
desired configuration.

If a tool uses kernel_maps__find_symbol() to look at the kernel
and modules mappings for a symbol but didn't call symbol__init()
first, that will generate a one time warning too, alerting the
subcommand developer that symbol__init() must be called.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259071517-3242-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-11-24 16:37:02 +01:00

262 lines
5.9 KiB
C

#include "data_map.h"
#include "symbol.h"
#include "util.h"
#include "debug.h"
static struct perf_file_handler *curr_handler;
static unsigned long mmap_window = 32;
static char __cwd[PATH_MAX];
static int
process_event_stub(event_t *event __used,
unsigned long offset __used,
unsigned long head __used)
{
return 0;
}
void register_perf_file_handler(struct perf_file_handler *handler)
{
if (!handler->process_sample_event)
handler->process_sample_event = process_event_stub;
if (!handler->process_mmap_event)
handler->process_mmap_event = process_event_stub;
if (!handler->process_comm_event)
handler->process_comm_event = process_event_stub;
if (!handler->process_fork_event)
handler->process_fork_event = process_event_stub;
if (!handler->process_exit_event)
handler->process_exit_event = process_event_stub;
if (!handler->process_lost_event)
handler->process_lost_event = process_event_stub;
if (!handler->process_read_event)
handler->process_read_event = process_event_stub;
if (!handler->process_throttle_event)
handler->process_throttle_event = process_event_stub;
if (!handler->process_unthrottle_event)
handler->process_unthrottle_event = process_event_stub;
curr_handler = handler;
}
static int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
trace_event(event);
switch (event->header.type) {
case PERF_RECORD_SAMPLE:
return curr_handler->process_sample_event(event, offset, head);
case PERF_RECORD_MMAP:
return curr_handler->process_mmap_event(event, offset, head);
case PERF_RECORD_COMM:
return curr_handler->process_comm_event(event, offset, head);
case PERF_RECORD_FORK:
return curr_handler->process_fork_event(event, offset, head);
case PERF_RECORD_EXIT:
return curr_handler->process_exit_event(event, offset, head);
case PERF_RECORD_LOST:
return curr_handler->process_lost_event(event, offset, head);
case PERF_RECORD_READ:
return curr_handler->process_read_event(event, offset, head);
case PERF_RECORD_THROTTLE:
return curr_handler->process_throttle_event(event, offset, head);
case PERF_RECORD_UNTHROTTLE:
return curr_handler->process_unthrottle_event(event, offset, head);
default:
curr_handler->total_unknown++;
return -1;
}
}
int perf_header__read_build_ids(int input, off_t offset, off_t size)
{
struct build_id_event bev;
char filename[PATH_MAX];
off_t limit = offset + size;
int err = -1;
while (offset < limit) {
struct dso *dso;
ssize_t len;
if (read(input, &bev, sizeof(bev)) != sizeof(bev))
goto out;
len = bev.header.size - sizeof(bev);
if (read(input, filename, len) != len)
goto out;
dso = dsos__findnew(filename);
if (dso != NULL)
dso__set_build_id(dso, &bev.build_id);
offset += bev.header.size;
}
err = 0;
out:
return err;
}
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
int force,
int full_paths,
int *cwdlen,
char **cwd)
{
int err;
struct perf_header *header;
unsigned long head, shift;
unsigned long offset = 0;
struct stat input_stat;
size_t page_size;
u64 sample_type;
event_t *event;
uint32_t size;
int input;
char *buf;
if (curr_handler == NULL) {
pr_debug("Forgot to register perf file handler\n");
return -EINVAL;
}
page_size = getpagesize();
input = open(input_name, O_RDONLY);
if (input < 0) {
pr_err("Failed to open file: %s", input_name);
if (!strcmp(input_name, "perf.data"))
pr_err(" (try 'perf record' first)");
pr_err("\n");
return -errno;
}
if (fstat(input, &input_stat) < 0) {
pr_err("failed to stat file");
err = -errno;
goto out_close;
}
err = -EACCES;
if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
pr_err("file: %s not owned by current user or root\n",
input_name);
goto out_close;
}
if (input_stat.st_size == 0) {
pr_info("zero-sized file, nothing to do!\n");
goto done;
}
err = -ENOMEM;
header = perf_header__new();
if (header == NULL)
goto out_close;
err = perf_header__read(header, input);
if (err < 0)
goto out_delete;
*pheader = header;
head = header->data_offset;
sample_type = perf_header__sample_type(header);
err = -EINVAL;
if (curr_handler->sample_type_check &&
curr_handler->sample_type_check(sample_type) < 0)
goto out_delete;
if (!full_paths) {
if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
pr_err("failed to get the current directory\n");
err = -errno;
goto out_delete;
}
*cwd = __cwd;
*cwdlen = strlen(*cwd);
} else {
*cwd = NULL;
*cwdlen = 0;
}
shift = page_size * (head / page_size);
offset += shift;
head -= shift;
remap:
buf = mmap(NULL, page_size * mmap_window, PROT_READ,
MAP_SHARED, input, offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
err = -errno;
goto out_delete;
}
more:
event = (event_t *)(buf + head);
size = event->header.size;
if (!size)
size = 8;
if (head + event->header.size >= page_size * mmap_window) {
int munmap_ret;
shift = page_size * (head / page_size);
munmap_ret = munmap(buf, page_size * mmap_window);
assert(munmap_ret == 0);
offset += shift;
head -= shift;
goto remap;
}
size = event->header.size;
dump_printf("\n%p [%p]: event: %d\n",
(void *)(offset + head),
(void *)(long)event->header.size,
event->header.type);
if (!size || process_event(event, offset, head) < 0) {
dump_printf("%p [%p]: skipping unknown header type: %d\n",
(void *)(offset + head),
(void *)(long)(event->header.size),
event->header.type);
/*
* 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 >= header->data_offset + header->data_size)
goto done;
if (offset + head < (unsigned long)input_stat.st_size)
goto more;
done:
err = 0;
out_close:
close(input);
return err;
out_delete:
perf_header__delete(header);
goto out_close;
}