mirror of https://gitee.com/openkylin/linux.git
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
#include <linux/kernel.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "session.h"
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#include "sort.h"
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#include "util.h"
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static int perf_session__open(struct perf_session *self, bool force)
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{
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struct stat input_stat;
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self->fd = open(self->filename, O_RDONLY);
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if (self->fd < 0) {
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pr_err("failed to open file: %s", self->filename);
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if (!strcmp(self->filename, "perf.data"))
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pr_err(" (try 'perf record' first)");
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pr_err("\n");
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return -errno;
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}
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if (fstat(self->fd, &input_stat) < 0)
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goto out_close;
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if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
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pr_err("file %s not owned by current user or root\n",
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self->filename);
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goto out_close;
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}
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if (!input_stat.st_size) {
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pr_info("zero-sized file (%s), nothing to do!\n",
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self->filename);
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goto out_close;
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}
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if (perf_header__read(&self->header, self->fd) < 0) {
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pr_err("incompatible file format");
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goto out_close;
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}
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self->size = input_stat.st_size;
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return 0;
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out_close:
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close(self->fd);
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self->fd = -1;
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return -1;
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}
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struct perf_session *perf_session__new(const char *filename, int mode, bool force)
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{
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size_t len = filename ? strlen(filename) + 1 : 0;
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struct perf_session *self = zalloc(sizeof(*self) + len);
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if (self == NULL)
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goto out;
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if (perf_header__init(&self->header) < 0)
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goto out_free;
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memcpy(self->filename, filename, len);
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self->threads = RB_ROOT;
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self->last_match = NULL;
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self->mmap_window = 32;
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self->cwd = NULL;
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self->cwdlen = 0;
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map_groups__init(&self->kmaps);
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if (perf_session__create_kernel_maps(self) < 0)
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goto out_delete;
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if (mode == O_RDONLY && perf_session__open(self, force) < 0)
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goto out_delete;
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out:
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return self;
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out_free:
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free(self);
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return NULL;
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out_delete:
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perf_session__delete(self);
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return NULL;
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}
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void perf_session__delete(struct perf_session *self)
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{
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perf_header__exit(&self->header);
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close(self->fd);
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free(self->cwd);
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free(self);
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}
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static bool symbol__match_parent_regex(struct symbol *sym)
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{
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if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
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return 1;
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return 0;
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}
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struct symbol **perf_session__resolve_callchain(struct perf_session *self,
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struct thread *thread,
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struct ip_callchain *chain,
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struct symbol **parent)
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{
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u8 cpumode = PERF_RECORD_MISC_USER;
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struct symbol **syms = NULL;
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unsigned int i;
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if (symbol_conf.use_callchain) {
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syms = calloc(chain->nr, sizeof(*syms));
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if (!syms) {
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fprintf(stderr, "Can't allocate memory for symbols\n");
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exit(-1);
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}
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}
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for (i = 0; i < chain->nr; i++) {
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u64 ip = chain->ips[i];
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struct addr_location al;
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if (ip >= PERF_CONTEXT_MAX) {
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switch (ip) {
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case PERF_CONTEXT_HV:
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cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
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case PERF_CONTEXT_KERNEL:
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cpumode = PERF_RECORD_MISC_KERNEL; break;
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case PERF_CONTEXT_USER:
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cpumode = PERF_RECORD_MISC_USER; break;
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default:
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break;
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}
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continue;
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}
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thread__find_addr_location(thread, self, cpumode,
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MAP__FUNCTION, ip, &al, NULL);
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if (al.sym != NULL) {
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if (sort__has_parent && !*parent &&
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symbol__match_parent_regex(al.sym))
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*parent = al.sym;
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if (!symbol_conf.use_callchain)
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break;
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syms[i] = al.sym;
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}
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}
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return syms;
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}
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