![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
To reduce the coupling of the symbol system with the rest of perf. 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: <1269557941-15617-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
622 lines
15 KiB
C
622 lines
15 KiB
C
#include <linux/types.h>
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#include "event.h"
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#include "debug.h"
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#include "session.h"
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#include "sort.h"
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#include "string.h"
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#include "strlist.h"
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#include "thread.h"
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static pid_t event__synthesize_comm(pid_t pid, int full,
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event__handler_t process,
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struct perf_session *session)
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{
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event_t ev;
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char filename[PATH_MAX];
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char bf[BUFSIZ];
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FILE *fp;
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size_t size = 0;
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DIR *tasks;
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struct dirent dirent, *next;
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pid_t tgid = 0;
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snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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out_race:
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/*
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* We raced with a task exiting - just return:
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*/
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pr_debug("couldn't open %s\n", filename);
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return 0;
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}
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memset(&ev.comm, 0, sizeof(ev.comm));
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while (!ev.comm.comm[0] || !ev.comm.pid) {
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if (fgets(bf, sizeof(bf), fp) == NULL)
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goto out_failure;
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if (memcmp(bf, "Name:", 5) == 0) {
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char *name = bf + 5;
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while (*name && isspace(*name))
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++name;
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size = strlen(name) - 1;
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memcpy(ev.comm.comm, name, size++);
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} else if (memcmp(bf, "Tgid:", 5) == 0) {
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char *tgids = bf + 5;
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while (*tgids && isspace(*tgids))
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++tgids;
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tgid = ev.comm.pid = atoi(tgids);
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}
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}
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ev.comm.header.type = PERF_RECORD_COMM;
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size = ALIGN(size, sizeof(u64));
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ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
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if (!full) {
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ev.comm.tid = pid;
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process(&ev, session);
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goto out_fclose;
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}
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snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
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tasks = opendir(filename);
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if (tasks == NULL)
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goto out_race;
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while (!readdir_r(tasks, &dirent, &next) && next) {
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char *end;
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pid = strtol(dirent.d_name, &end, 10);
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if (*end)
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continue;
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ev.comm.tid = pid;
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process(&ev, session);
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}
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closedir(tasks);
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out_fclose:
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fclose(fp);
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return tgid;
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out_failure:
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pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
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return -1;
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}
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static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
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event__handler_t process,
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struct perf_session *session)
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{
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char filename[PATH_MAX];
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FILE *fp;
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snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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/*
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* We raced with a task exiting - just return:
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*/
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pr_debug("couldn't open %s\n", filename);
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return -1;
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}
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while (1) {
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char bf[BUFSIZ], *pbf = bf;
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event_t ev = {
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.header = {
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.type = PERF_RECORD_MMAP,
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.misc = 0, /* Just like the kernel, see kernel/perf_event.c __perf_event_mmap */
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},
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};
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int n;
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size_t size;
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if (fgets(bf, sizeof(bf), fp) == NULL)
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break;
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/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
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n = hex2u64(pbf, &ev.mmap.start);
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if (n < 0)
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continue;
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pbf += n + 1;
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n = hex2u64(pbf, &ev.mmap.len);
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if (n < 0)
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continue;
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pbf += n + 3;
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if (*pbf == 'x') { /* vm_exec */
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char *execname = strchr(bf, '/');
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/* Catch VDSO */
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if (execname == NULL)
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execname = strstr(bf, "[vdso]");
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if (execname == NULL)
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continue;
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size = strlen(execname);
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execname[size - 1] = '\0'; /* Remove \n */
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memcpy(ev.mmap.filename, execname, size);
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size = ALIGN(size, sizeof(u64));
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ev.mmap.len -= ev.mmap.start;
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ev.mmap.header.size = (sizeof(ev.mmap) -
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(sizeof(ev.mmap.filename) - size));
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ev.mmap.pid = tgid;
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ev.mmap.tid = pid;
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process(&ev, session);
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}
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}
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fclose(fp);
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return 0;
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}
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int event__synthesize_modules(event__handler_t process,
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struct perf_session *session)
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{
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struct rb_node *nd;
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for (nd = rb_first(&session->kmaps.maps[MAP__FUNCTION]);
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nd; nd = rb_next(nd)) {
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event_t ev;
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size_t size;
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struct map *pos = rb_entry(nd, struct map, rb_node);
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if (pos->dso->kernel)
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continue;
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size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
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memset(&ev, 0, sizeof(ev));
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ev.mmap.header.misc = 1; /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
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ev.mmap.header.type = PERF_RECORD_MMAP;
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ev.mmap.header.size = (sizeof(ev.mmap) -
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(sizeof(ev.mmap.filename) - size));
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ev.mmap.start = pos->start;
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ev.mmap.len = pos->end - pos->start;
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memcpy(ev.mmap.filename, pos->dso->long_name,
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pos->dso->long_name_len + 1);
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process(&ev, session);
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}
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return 0;
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}
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int event__synthesize_thread(pid_t pid, event__handler_t process,
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struct perf_session *session)
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{
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pid_t tgid = event__synthesize_comm(pid, 1, process, session);
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if (tgid == -1)
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return -1;
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return event__synthesize_mmap_events(pid, tgid, process, session);
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}
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void event__synthesize_threads(event__handler_t process,
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struct perf_session *session)
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{
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DIR *proc;
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struct dirent dirent, *next;
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proc = opendir("/proc");
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while (!readdir_r(proc, &dirent, &next) && next) {
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char *end;
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pid_t pid = strtol(dirent.d_name, &end, 10);
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if (*end) /* only interested in proper numerical dirents */
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continue;
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event__synthesize_thread(pid, process, session);
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}
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closedir(proc);
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}
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struct process_symbol_args {
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const char *name;
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u64 start;
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};
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static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
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{
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struct process_symbol_args *args = arg;
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/*
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* Must be a function or at least an alias, as in PARISC64, where "_text" is
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* an 'A' to the same address as "_stext".
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*/
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if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
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type == 'A') || strcmp(name, args->name))
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return 0;
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args->start = start;
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return 1;
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}
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int event__synthesize_kernel_mmap(event__handler_t process,
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struct perf_session *session,
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const char *symbol_name)
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{
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size_t size;
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event_t ev = {
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.header = {
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.type = PERF_RECORD_MMAP,
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.misc = 1, /* kernel uses 0 for user space maps, see kernel/perf_event.c __perf_event_mmap */
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},
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};
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/*
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* We should get this from /sys/kernel/sections/.text, but till that is
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* available use this, and after it is use this as a fallback for older
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* kernels.
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*/
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struct process_symbol_args args = { .name = symbol_name, };
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if (kallsyms__parse("/proc/kallsyms", &args, find_symbol_cb) <= 0)
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return -ENOENT;
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size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
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"[kernel.kallsyms.%s]", symbol_name) + 1;
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size = ALIGN(size, sizeof(u64));
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ev.mmap.header.size = (sizeof(ev.mmap) - (sizeof(ev.mmap.filename) - size));
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ev.mmap.pgoff = args.start;
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ev.mmap.start = session->vmlinux_maps[MAP__FUNCTION]->start;
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ev.mmap.len = session->vmlinux_maps[MAP__FUNCTION]->end - ev.mmap.start ;
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return process(&ev, session);
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}
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static void thread__comm_adjust(struct thread *self)
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{
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char *comm = self->comm;
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if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
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(!symbol_conf.comm_list ||
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strlist__has_entry(symbol_conf.comm_list, comm))) {
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unsigned int slen = strlen(comm);
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if (slen > comms__col_width) {
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comms__col_width = slen;
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threads__col_width = slen + 6;
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}
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}
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}
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static int thread__set_comm_adjust(struct thread *self, const char *comm)
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{
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int ret = thread__set_comm(self, comm);
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if (ret)
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return ret;
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thread__comm_adjust(self);
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return 0;
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}
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int event__process_comm(event_t *self, struct perf_session *session)
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{
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struct thread *thread = perf_session__findnew(session, self->comm.pid);
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dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
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if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
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dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
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return -1;
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}
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return 0;
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}
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int event__process_lost(event_t *self, struct perf_session *session)
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{
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dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
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session->events_stats.lost += self->lost.lost;
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return 0;
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}
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int event__process_mmap(event_t *self, struct perf_session *session)
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{
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struct thread *thread;
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struct map *map;
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dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
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self->mmap.pid, self->mmap.tid, self->mmap.start,
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self->mmap.len, self->mmap.pgoff, self->mmap.filename);
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if (self->mmap.pid == 0) {
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static const char kmmap_prefix[] = "[kernel.kallsyms.";
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if (self->mmap.filename[0] == '/') {
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char short_module_name[1024];
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char *name = strrchr(self->mmap.filename, '/'), *dot;
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if (name == NULL)
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goto out_problem;
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++name; /* skip / */
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dot = strrchr(name, '.');
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if (dot == NULL)
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goto out_problem;
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snprintf(short_module_name, sizeof(short_module_name),
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"[%.*s]", (int)(dot - name), name);
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strxfrchar(short_module_name, '-', '_');
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map = perf_session__new_module_map(session,
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self->mmap.start,
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self->mmap.filename);
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if (map == NULL)
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goto out_problem;
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name = strdup(short_module_name);
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if (name == NULL)
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goto out_problem;
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map->dso->short_name = name;
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map->end = map->start + self->mmap.len;
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} else if (memcmp(self->mmap.filename, kmmap_prefix,
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sizeof(kmmap_prefix) - 1) == 0) {
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const char *symbol_name = (self->mmap.filename +
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sizeof(kmmap_prefix) - 1);
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/*
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* Should be there already, from the build-id table in
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* the header.
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*/
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struct dso *kernel = __dsos__findnew(&dsos__kernel,
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"[kernel.kallsyms]");
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if (kernel == NULL)
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goto out_problem;
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kernel->kernel = 1;
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if (__perf_session__create_kernel_maps(session, kernel) < 0)
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goto out_problem;
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session->vmlinux_maps[MAP__FUNCTION]->start = self->mmap.start;
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session->vmlinux_maps[MAP__FUNCTION]->end = self->mmap.start + self->mmap.len;
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/*
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* Be a bit paranoid here, some perf.data file came with
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* a zero sized synthesized MMAP event for the kernel.
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*/
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if (session->vmlinux_maps[MAP__FUNCTION]->end == 0)
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session->vmlinux_maps[MAP__FUNCTION]->end = ~0UL;
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perf_session__set_kallsyms_ref_reloc_sym(session, symbol_name,
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self->mmap.pgoff);
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}
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return 0;
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}
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thread = perf_session__findnew(session, self->mmap.pid);
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map = map__new(self->mmap.start, self->mmap.len, self->mmap.pgoff,
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self->mmap.pid, self->mmap.filename, MAP__FUNCTION,
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session->cwd, session->cwdlen);
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if (thread == NULL || map == NULL)
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goto out_problem;
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thread__insert_map(thread, map);
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return 0;
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out_problem:
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dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
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return 0;
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}
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int event__process_task(event_t *self, struct perf_session *session)
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{
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struct thread *thread = perf_session__findnew(session, self->fork.pid);
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struct thread *parent = perf_session__findnew(session, self->fork.ppid);
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dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
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self->fork.ppid, self->fork.ptid);
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/*
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* A thread clone will have the same PID for both parent and child.
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*/
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if (thread == parent)
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return 0;
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if (self->header.type == PERF_RECORD_EXIT)
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return 0;
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if (thread == NULL || parent == NULL ||
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thread__fork(thread, parent) < 0) {
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dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
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return -1;
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}
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return 0;
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}
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void thread__find_addr_map(struct thread *self,
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struct perf_session *session, u8 cpumode,
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enum map_type type, u64 addr,
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struct addr_location *al)
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{
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struct map_groups *mg = &self->mg;
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al->thread = self;
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al->addr = addr;
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if (cpumode == PERF_RECORD_MISC_KERNEL) {
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al->level = 'k';
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mg = &session->kmaps;
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} else if (cpumode == PERF_RECORD_MISC_USER)
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al->level = '.';
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else {
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al->level = 'H';
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al->map = NULL;
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return;
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}
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try_again:
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al->map = map_groups__find(mg, type, al->addr);
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if (al->map == NULL) {
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/*
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* If this is outside of all known maps, and is a negative
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* address, try to look it up in the kernel dso, as it might be
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* a vsyscall or vdso (which executes in user-mode).
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*
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* XXX This is nasty, we should have a symbol list in the
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* "[vdso]" dso, but for now lets use the old trick of looking
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* in the whole kernel symbol list.
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*/
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if ((long long)al->addr < 0 && mg != &session->kmaps) {
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mg = &session->kmaps;
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goto try_again;
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}
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} else
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al->addr = al->map->map_ip(al->map, al->addr);
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}
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void thread__find_addr_location(struct thread *self,
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struct perf_session *session, u8 cpumode,
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enum map_type type, u64 addr,
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struct addr_location *al,
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symbol_filter_t filter)
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{
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thread__find_addr_map(self, session, cpumode, type, addr, al);
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if (al->map != NULL)
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al->sym = map__find_symbol(al->map, al->addr, filter);
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else
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al->sym = NULL;
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}
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static void dso__calc_col_width(struct dso *self)
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{
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if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
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(!symbol_conf.dso_list ||
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strlist__has_entry(symbol_conf.dso_list, self->name))) {
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unsigned int slen = strlen(self->name);
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if (slen > dsos__col_width)
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dsos__col_width = slen;
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}
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self->slen_calculated = 1;
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}
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int event__preprocess_sample(const event_t *self, struct perf_session *session,
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struct addr_location *al, symbol_filter_t filter)
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{
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u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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struct thread *thread = perf_session__findnew(session, self->ip.pid);
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if (thread == NULL)
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return -1;
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if (symbol_conf.comm_list &&
|
|
!strlist__has_entry(symbol_conf.comm_list, thread->comm))
|
|
goto out_filtered;
|
|
|
|
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
|
|
|
|
thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
|
|
self->ip.ip, al);
|
|
dump_printf(" ...... dso: %s\n",
|
|
al->map ? al->map->dso->long_name :
|
|
al->level == 'H' ? "[hypervisor]" : "<not found>");
|
|
al->sym = NULL;
|
|
|
|
if (al->map) {
|
|
if (symbol_conf.dso_list &&
|
|
(!al->map || !al->map->dso ||
|
|
!(strlist__has_entry(symbol_conf.dso_list,
|
|
al->map->dso->short_name) ||
|
|
(al->map->dso->short_name != al->map->dso->long_name &&
|
|
strlist__has_entry(symbol_conf.dso_list,
|
|
al->map->dso->long_name)))))
|
|
goto out_filtered;
|
|
/*
|
|
* We have to do this here as we may have a dso with no symbol
|
|
* hit that has a name longer than the ones with symbols
|
|
* sampled.
|
|
*/
|
|
if (!sort_dso.elide && !al->map->dso->slen_calculated)
|
|
dso__calc_col_width(al->map->dso);
|
|
|
|
al->sym = map__find_symbol(al->map, al->addr, filter);
|
|
}
|
|
|
|
if (symbol_conf.sym_list && al->sym &&
|
|
!strlist__has_entry(symbol_conf.sym_list, al->sym->name))
|
|
goto out_filtered;
|
|
|
|
al->filtered = false;
|
|
return 0;
|
|
|
|
out_filtered:
|
|
al->filtered = true;
|
|
return 0;
|
|
}
|
|
|
|
int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
|
|
{
|
|
u64 *array = event->sample.array;
|
|
|
|
if (type & PERF_SAMPLE_IP) {
|
|
data->ip = event->ip.ip;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TID) {
|
|
u32 *p = (u32 *)array;
|
|
data->pid = p[0];
|
|
data->tid = p[1];
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TIME) {
|
|
data->time = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ADDR) {
|
|
data->addr = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ID) {
|
|
data->id = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STREAM_ID) {
|
|
data->stream_id = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CPU) {
|
|
u32 *p = (u32 *)array;
|
|
data->cpu = *p;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_PERIOD) {
|
|
data->period = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_READ) {
|
|
pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
|
|
return -1;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CALLCHAIN) {
|
|
data->callchain = (struct ip_callchain *)array;
|
|
array += 1 + data->callchain->nr;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_RAW) {
|
|
u32 *p = (u32 *)array;
|
|
data->raw_size = *p;
|
|
p++;
|
|
data->raw_data = p;
|
|
}
|
|
|
|
return 0;
|
|
}
|