mirror of https://gitee.com/openkylin/linux.git
perf tools: Generalize event synthesizing routines
Because we will need it in 'perf top' to support userspace symbols for existing threads. Now we pass a callback that will receive the synthesized event and then write it to the output file in 'perf record' and in the upcoming patch for 'perf top' we will just immediatelly create the in memory representation of threads and maps. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1256592199-9608-2-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
Ingo Molnar
parent
7f3bedcc93
commit
234fbbf508
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@ -380,6 +380,7 @@ LIB_OBJS += util/alias.o
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LIB_OBJS += util/config.o
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LIB_OBJS += util/ctype.o
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LIB_OBJS += util/environment.o
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LIB_OBJS += util/event.o
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LIB_OBJS += util/exec_cmd.o
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LIB_OBJS += util/help.o
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LIB_OBJS += util/levenshtein.o
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@ -109,6 +109,12 @@ static void write_output(void *buf, size_t size)
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}
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}
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static int process_synthesized_event(event_t *event)
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{
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write_output(event, event->header.size);
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return 0;
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}
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static void mmap_read(struct mmap_data *md)
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{
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unsigned int head = mmap_read_head(md);
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@ -191,172 +197,6 @@ static void sig_atexit(void)
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kill(getpid(), signr);
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}
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static pid_t pid_synthesize_comm_event(pid_t pid, int full)
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{
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struct comm_event comm_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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if (verbose)
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fprintf(stderr, "couldn't open %s\n", filename);
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return 0;
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}
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memset(&comm_ev, 0, sizeof(comm_ev));
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while (!comm_ev.comm[0] || !comm_ev.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(comm_ev.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 = comm_ev.pid = atoi(tgids);
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}
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}
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comm_ev.header.type = PERF_RECORD_COMM;
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size = ALIGN(size, sizeof(u64));
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comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
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if (!full) {
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comm_ev.tid = pid;
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write_output(&comm_ev, comm_ev.header.size);
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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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comm_ev.tid = pid;
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write_output(&comm_ev, comm_ev.header.size);
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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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fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
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filename);
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exit(EXIT_FAILURE);
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}
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static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid)
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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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if (verbose)
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fprintf(stderr, "couldn't open %s\n", filename);
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return;
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}
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while (1) {
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char bf[BUFSIZ], *pbf = bf;
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struct mmap_event mmap_ev = {
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.header = { .type = PERF_RECORD_MMAP },
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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, &mmap_ev.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, &mmap_ev.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(mmap_ev.filename, execname, size);
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size = ALIGN(size, sizeof(u64));
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mmap_ev.len -= mmap_ev.start;
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mmap_ev.header.size = (sizeof(mmap_ev) -
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(sizeof(mmap_ev.filename) - size));
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mmap_ev.pid = tgid;
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mmap_ev.tid = pid;
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write_output(&mmap_ev, mmap_ev.header.size);
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}
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}
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fclose(fp);
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}
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static void synthesize_all(void)
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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, tgid;
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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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tgid = pid_synthesize_comm_event(pid, 1);
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pid_synthesize_mmap_samples(pid, tgid);
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}
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closedir(proc);
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}
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static int group_fd;
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static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
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@ -608,11 +448,10 @@ static int __cmd_record(int argc, const char **argv)
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if (file_new)
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perf_header__write(header, output);
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if (!system_wide) {
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pid_t tgid = pid_synthesize_comm_event(pid, 0);
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pid_synthesize_mmap_samples(pid, tgid);
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} else
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synthesize_all();
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if (!system_wide)
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event__synthesize_thread(pid, process_synthesized_event);
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else
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event__synthesize_threads(process_synthesized_event);
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if (target_pid == -1 && argc) {
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pid = fork();
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@ -0,0 +1,177 @@
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#include <linux/types.h>
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#include "event.h"
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#include "debug.h"
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#include "string.h"
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static pid_t event__synthesize_comm(pid_t pid, int full,
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int (*process)(event_t *event))
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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);
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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);
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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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int (*process)(event_t *event))
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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 = { .type = PERF_RECORD_MMAP },
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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);
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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_thread(pid_t pid, int (*process)(event_t *event))
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{
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pid_t tgid = event__synthesize_comm(pid, 1, process);
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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);
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}
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void event__synthesize_threads(int (*process)(event_t *event))
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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);
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}
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closedir(proc);
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}
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@ -111,4 +111,7 @@ struct map *map__clone(struct map *self);
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int map__overlap(struct map *l, struct map *r);
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size_t map__fprintf(struct map *self, FILE *fp);
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int event__synthesize_thread(pid_t pid, int (*process)(event_t *event));
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void event__synthesize_threads(int (*process)(event_t *event));
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#endif /* __PERF_RECORD_H */
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