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debug.c
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debug.c
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/*
* Copyright (C) 2011 Taobao Inc.
*
* Liu Yuan <namei.unix@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "collie.h"
static inline void print_thread_name(struct trace_graph_item *item)
{
printf("%-20s|", item->tname);
}
static inline void print_time(struct trace_graph_item *item)
{
if (item->type == TRACE_GRAPH_RETURN) {
unsigned duration = item->return_time - item->entry_time;
unsigned quot = duration / 1000, rem = duration % 1000;
printf("%8u.%-3u|", quot, rem);
} else if (item->type == TRACE_GRAPH_ENTRY) {
printf(" |");
}
}
static inline void print_finale(struct trace_graph_item *item)
{
int i;
for (i = 0; i < item->depth; i++)
printf(" ");
if (item->type == TRACE_GRAPH_ENTRY)
printf("%s() {\n", item->fname);
else
printf("}\n");
}
static void print_trace_item(struct trace_graph_item *item)
{
print_thread_name(item);
print_time(item);
print_finale(item);
}
static void parse_trace_buffer(char *buf, int size)
{
struct trace_graph_item *item = (struct trace_graph_item *)buf;
int sz = size / sizeof(struct trace_graph_item), i;
printf(" Thread Name | Time(us) | Function Graph\n");
printf("--------------------------------------------------\n");
for (i = 0; i < sz; i++)
print_trace_item(item++);
return;
}
const char *tracefile = "/tmp/tracefile";
static int trace_read_buffer(void)
{
int fd, ret, tfd;
struct sd_req hdr;
struct sd_rsp *rsp = (struct sd_rsp *)&hdr;
unsigned rlen, wlen;
#define TRACE_BUF_LEN (1024 * 1024 * 20)
char *buf = xzalloc(TRACE_BUF_LEN);
tfd = open(tracefile, O_CREAT | O_RDWR | O_APPEND | O_TRUNC, 0644);
if (tfd < 0) {
fprintf(stderr, "can't create tracefile\n");
return EXIT_SYSFAIL;
}
fd = connect_to(sdhost, sdport);
if (fd < 0)
return EXIT_SYSFAIL;
read_buffer:
sd_init_req(&hdr, SD_OP_TRACE_READ_BUF);
hdr.data_length = rlen = TRACE_BUF_LEN;
hdr.epoch = sd_epoch;
wlen = 0;
ret = exec_req(fd, &hdr, buf, &wlen, &rlen);
if (ret) {
fprintf(stderr, "Failed to connect\n");
close(fd);
return EXIT_SYSFAIL;
}
if (rsp->result == SD_RES_AGAIN)
goto read_buffer;
if (rsp->result != SD_RES_SUCCESS) {
fprintf(stderr, "Trace failed: %s\n",
sd_strerror(rsp->result));
close(fd);
return EXIT_FAILURE;
}
xwrite(tfd, buf, rlen);
if (rlen == TRACE_BUF_LEN) {
memset(buf, 0, TRACE_BUF_LEN);
goto read_buffer;
}
close(fd);
free(buf);
return EXIT_SUCCESS;
}
static int trace_start(int argc, char **argv)
{
int ret;
struct sd_req hdr;
struct sd_rsp *rsp = (struct sd_rsp *)&hdr;
sd_init_req(&hdr, SD_OP_TRACE);
hdr.epoch = sd_epoch;
hdr.data_length = 1;
ret = send_light_req(&hdr, sdhost, sdport);
if (ret) {
fprintf(stderr, "Trace start failed: %s\n",
sd_strerror(rsp->result));
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
static int trace_stop(int argc, char **argv)
{
int ret;
struct sd_req hdr;
struct sd_rsp *rsp = (struct sd_rsp *)&hdr;
sd_init_req(&hdr, SD_OP_TRACE);
hdr.epoch = sd_epoch;
hdr.data_length = 0;
ret = send_light_req(&hdr, sdhost, sdport);
if (ret) {
fprintf(stderr, "Trace stop failed: %s\n",
sd_strerror(rsp->result));
return EXIT_FAILURE;
}
return trace_read_buffer();
}
static int trace_cat(int argc, char **argv)
{
int fd = open(tracefile, O_RDONLY);
struct stat st;
void *map;
if (fd < 0) {
fprintf(stderr, "%m\n");
return EXIT_SYSFAIL;
}
if (fstat(fd, &st) < 0) {
fprintf(stderr, "%m\n");
close(fd);
return EXIT_SYSFAIL;
}
map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (map == MAP_FAILED) {
fprintf(stderr, "%m\n");
return EXIT_SYSFAIL;
}
parse_trace_buffer(map, st.st_size);
munmap(map, st.st_size);
return EXIT_SUCCESS;
}
static int debug_parser(int ch, char *opt)
{
return 0;
}
/* Subcommand list of trace */
static struct subcommand trace_cmd[] = {
{"start", NULL, NULL, "start the trace",
NULL, 0, trace_start},
{"stop", NULL, NULL, "stop the trace",
NULL, 0, trace_stop},
{"cat", NULL, NULL, "cat the trace",
NULL, 0, trace_cat},
{NULL},
};
static int debug_trace(int argc, char **argv)
{
int i;
for (i = 0; trace_cmd[i].name; i++) {
if (!strcmp(trace_cmd[i].name, argv[3]))
return trace_cmd[i].fn(argc, argv);
}
subcommand_usage(argv[1], argv[2], EXIT_FAILURE);
return EXIT_FAILURE;
}
static struct subcommand debug_cmd[] = {
{"trace", NULL, "aph", "trace the node",
trace_cmd, SUBCMD_FLAG_NEED_THIRD_ARG, debug_trace},
{NULL,},
};
struct command debug_command = {
"debug",
debug_cmd,
debug_parser
};