223 lines
5.2 KiB
C
223 lines
5.2 KiB
C
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#include "data_map.h"
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#include "symbol.h"
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#include "util.h"
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#include "debug.h"
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static struct perf_file_handler *curr_handler;
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static unsigned long mmap_window = 32;
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static char __cwd[PATH_MAX];
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static int
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process_event_stub(event_t *event __used,
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unsigned long offset __used,
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unsigned long head __used)
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{
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return 0;
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}
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void register_perf_file_handler(struct perf_file_handler *handler)
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{
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if (!handler->process_sample_event)
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handler->process_sample_event = process_event_stub;
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if (!handler->process_mmap_event)
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handler->process_mmap_event = process_event_stub;
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if (!handler->process_comm_event)
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handler->process_comm_event = process_event_stub;
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if (!handler->process_fork_event)
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handler->process_fork_event = process_event_stub;
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if (!handler->process_exit_event)
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handler->process_exit_event = process_event_stub;
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if (!handler->process_lost_event)
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handler->process_lost_event = process_event_stub;
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if (!handler->process_read_event)
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handler->process_read_event = process_event_stub;
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if (!handler->process_throttle_event)
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handler->process_throttle_event = process_event_stub;
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if (!handler->process_unthrottle_event)
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handler->process_unthrottle_event = process_event_stub;
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curr_handler = handler;
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}
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static int
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process_event(event_t *event, unsigned long offset, unsigned long head)
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{
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trace_event(event);
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switch (event->header.type) {
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case PERF_RECORD_SAMPLE:
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return curr_handler->process_sample_event(event, offset, head);
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case PERF_RECORD_MMAP:
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return curr_handler->process_mmap_event(event, offset, head);
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case PERF_RECORD_COMM:
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return curr_handler->process_comm_event(event, offset, head);
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case PERF_RECORD_FORK:
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return curr_handler->process_fork_event(event, offset, head);
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case PERF_RECORD_EXIT:
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return curr_handler->process_exit_event(event, offset, head);
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case PERF_RECORD_LOST:
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return curr_handler->process_lost_event(event, offset, head);
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case PERF_RECORD_READ:
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return curr_handler->process_read_event(event, offset, head);
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case PERF_RECORD_THROTTLE:
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return curr_handler->process_throttle_event(event, offset, head);
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case PERF_RECORD_UNTHROTTLE:
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return curr_handler->process_unthrottle_event(event, offset, head);
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default:
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curr_handler->total_unknown++;
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return -1;
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}
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}
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int mmap_dispatch_perf_file(struct perf_header **pheader,
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const char *input_name,
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int force,
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int full_paths,
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int *cwdlen,
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char **cwd)
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{
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int ret, rc = EXIT_FAILURE;
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struct perf_header *header;
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unsigned long head, shift;
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unsigned long offset = 0;
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struct stat input_stat;
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size_t page_size;
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u64 sample_type;
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event_t *event;
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uint32_t size;
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int input;
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char *buf;
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if (!curr_handler)
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die("Forgot to register perf file handler");
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page_size = getpagesize();
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input = open(input_name, O_RDONLY);
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if (input < 0) {
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fprintf(stderr, " failed to open file: %s", input_name);
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if (!strcmp(input_name, "perf.data"))
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fprintf(stderr, " (try 'perf record' first)");
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fprintf(stderr, "\n");
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exit(-1);
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}
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ret = fstat(input, &input_stat);
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if (ret < 0) {
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perror("failed to stat file");
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exit(-1);
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}
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if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
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fprintf(stderr, "file: %s not owned by current user or root\n",
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input_name);
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exit(-1);
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}
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if (!input_stat.st_size) {
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fprintf(stderr, "zero-sized file, nothing to do!\n");
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exit(0);
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}
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*pheader = perf_header__read(input);
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header = *pheader;
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head = header->data_offset;
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sample_type = perf_header__sample_type(header);
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if (curr_handler->sample_type_check)
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if (curr_handler->sample_type_check(sample_type) < 0)
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exit(-1);
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if (load_kernel() < 0) {
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perror("failed to load kernel symbols");
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return EXIT_FAILURE;
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}
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if (!full_paths) {
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if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
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perror("failed to get the current directory");
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return EXIT_FAILURE;
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}
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*cwd = __cwd;
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*cwdlen = strlen(*cwd);
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} else {
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*cwd = NULL;
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*cwdlen = 0;
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}
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shift = page_size * (head / page_size);
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offset += shift;
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head -= shift;
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remap:
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buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
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MAP_SHARED, input, offset);
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if (buf == MAP_FAILED) {
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perror("failed to mmap file");
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exit(-1);
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}
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more:
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event = (event_t *)(buf + head);
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size = event->header.size;
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if (!size)
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size = 8;
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if (head + event->header.size >= page_size * mmap_window) {
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int munmap_ret;
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shift = page_size * (head / page_size);
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munmap_ret = munmap(buf, page_size * mmap_window);
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assert(munmap_ret == 0);
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offset += shift;
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head -= shift;
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goto remap;
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}
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size = event->header.size;
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dump_printf("\n%p [%p]: event: %d\n",
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(void *)(offset + head),
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(void *)(long)event->header.size,
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event->header.type);
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if (!size || process_event(event, offset, head) < 0) {
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dump_printf("%p [%p]: skipping unknown header type: %d\n",
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(void *)(offset + head),
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(void *)(long)(event->header.size),
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event->header.type);
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/*
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* assume we lost track of the stream, check alignment, and
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* increment a single u64 in the hope to catch on again 'soon'.
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*/
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if (unlikely(head & 7))
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head &= ~7ULL;
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size = 8;
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}
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head += size;
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if (offset + head >= header->data_offset + header->data_size)
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goto done;
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if (offset + head < (unsigned long)input_stat.st_size)
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goto more;
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done:
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rc = EXIT_SUCCESS;
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close(input);
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return rc;
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}
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