#include <string.h>
#include <sys/ioctl.h>
#include <sys/param.h>
+#include <sys/statfs.h>
+#include <sys/poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <sched.h>
#include <ctype.h>
#include <getopt.h>
+#include <errno.h>
+#include <assert.h>
#include "blktrace.h"
+#include "list.h"
-#define BUF_SIZE (128 *1024)
+static char blktrace_version[] = "0.99";
+
+/*
+ * You may want to increase this even more, if you are logging at a high
+ * rate and see skipped/missed events
+ */
+#define BUF_SIZE (512 * 1024)
#define BUF_NR (4)
-#define DECLARE_MASK_MAP(mask) { BLK_TC_##mask, #mask, "BLK_TC_"#mask }
-#define COMPARE_MASK_MAP(mmp, str) \
- (!strcasecmp((mmp)->short_form, (str)) || \
- !strcasecmp((mmp)->long_form, (str)))
+#define OFILE_BUF (128 * 1024)
-#define VALID_SET(x) ((1 <= (x)) && ((x) < (1 << BLK_TC_SHIFT)))
+#define RELAYFS_TYPE 0xF0B4A981
-struct mask_map {
- int mask;
- char *short_form;
- char *long_form;
-};
+#define RING_INIT_NR (2)
+#define RING_MAX_NR (16UL)
-struct mask_map mask_maps[] = {
- DECLARE_MASK_MAP(READ),
- DECLARE_MASK_MAP(WRITE),
- DECLARE_MASK_MAP(BARRIER),
- DECLARE_MASK_MAP(SYNC),
- DECLARE_MASK_MAP(QUEUE),
- DECLARE_MASK_MAP(REQUEUE),
- DECLARE_MASK_MAP(ISSUE),
- DECLARE_MASK_MAP(COMPLETE),
- DECLARE_MASK_MAP(FS),
- DECLARE_MASK_MAP(PC),
-};
-
-#define S_OPTS "d:a:A:r:o:k"
+#define S_OPTS "d:a:A:r:o:kw:Vb:n:D:"
static struct option l_opts[] = {
{
.name = "dev",
- .has_arg = 1,
+ .has_arg = required_argument,
.flag = NULL,
.val = 'd'
},
{
.name = "act-mask",
- .has_arg = 1,
+ .has_arg = required_argument,
.flag = NULL,
.val = 'a'
},
{
.name = "set-mask",
- .has_arg = 1,
+ .has_arg = required_argument,
.flag = NULL,
.val = 'A'
},
{
.name = "relay",
- .has_arg = 1,
+ .has_arg = required_argument,
.flag = NULL,
.val = 'r'
},
{
.name = "output",
- .has_arg = 1,
+ .has_arg = required_argument,
.flag = NULL,
.val = 'o'
},
{
.name = "kill",
- .has_arg = 0,
+ .has_arg = no_argument,
.flag = NULL,
.val = 'k'
},
{
- .name = NULL,
- .has_arg = 0,
+ .name = "stopwatch",
+ .has_arg = required_argument,
.flag = NULL,
- .val = 0
+ .val = 'w'
+ },
+ {
+ .name = "version",
+ .has_arg = no_argument,
+ .flag = NULL,
+ .val = 'V'
+ },
+ {
+ .name = "buffer-size",
+ .has_arg = required_argument,
+ .flag = NULL,
+ .val = 'b'
+ },
+ {
+ .name = "num-sub-buffers",
+ .has_arg = required_argument,
+ .flag = NULL,
+ .val = 'n'
+ },
+ {
+ .name = "output-dir",
+ .has_arg = required_argument,
+ .flag = NULL,
+ .val = 'D'
+ },
+ {
+ .name = NULL,
}
};
+struct tip_subbuf {
+ struct list_head list;
+ void *buf;
+ unsigned int len;
+ unsigned int max_len;
+};
+
struct thread_information {
int cpu;
pthread_t thread;
int fd;
+ void *fd_buf;
+ unsigned long fd_off;
+ unsigned long fd_size;
+ unsigned long fd_max_size;
char fn[MAXPATHLEN + 64];
- pthread_mutex_t *fd_lock;
- int ofd;
+ FILE *ofile;
+ char *ofile_buffer;
+ int ofile_stdout;
unsigned long events_processed;
-};
+ struct device_information *device;
-static char *relay_path;
+ int exited;
-#define is_done() (*(volatile int *)(&done))
-static volatile int done;
+ pthread_mutex_t lock;
+ struct list_head subbuf_list;
+ struct tip_subbuf *leftover_ts;
+};
-static int devfd, ncpus;
+struct device_information {
+ int fd;
+ char *path;
+ char buts_name[32];
+ volatile int trace_started;
+ unsigned long drop_count;
+ struct thread_information *threads;
+};
+
+static int ncpus;
static struct thread_information *thread_information;
-static char *buts_name_p;
-static char *dev;
+static int ndevs;
+static struct device_information *device_information;
+
+/* command line option globals */
+static char *relay_path;
static char *output_name;
+static char *output_dir;
static int act_mask = ~0U;
-static int trace_started;
static int kill_running_trace;
+static unsigned long buf_size = BUF_SIZE;
+static unsigned long buf_nr = BUF_NR;
+
+#define is_done() (*(volatile int *)(&done))
+static volatile int done;
+
+#define is_trace_stopped() (*(volatile int *)(&trace_stopped))
+static volatile int trace_stopped;
+
+#define is_stat_shown() (*(volatile int *)(&stat_shown))
+static volatile int stat_shown;
+
+static void exit_trace(int status);
+
+#define dip_tracing(dip) (*(volatile int *)(&(dip)->trace_started))
+#define dip_set_tracing(dip, v) ((dip)->trace_started = (v))
-static pthread_mutex_t stdout_mutex = PTHREAD_MUTEX_INITIALIZER;
+#define __for_each_dip(__d, __i, __e) \
+ for (__i = 0, __d = device_information; __i < __e; __i++, __d++)
-int find_mask_map(char *string)
+#define for_each_dip(__d, __i) __for_each_dip(__d, __i, ndevs)
+#define for_each_tip(__d, __t, __j) \
+ for (__j = 0, __t = (__d)->threads; __j < ncpus; __j++, __t++)
+
+static int get_dropped_count(const char *buts_name)
{
- int i;
+ int fd;
+ char tmp[MAXPATHLEN + 64];
- for (i = 0; i < sizeof(mask_maps)/sizeof(mask_maps[0]); i++)
- if (COMPARE_MASK_MAP(&mask_maps[i], string))
- return mask_maps[i].mask;
+ snprintf(tmp, sizeof(tmp), "%s/block/%s/dropped",
+ relay_path, buts_name);
- return -1;
+ fd = open(tmp, O_RDONLY);
+ if (fd < 0) {
+ /*
+ * this may be ok, if the kernel doesn't support dropped counts
+ */
+ if (errno == ENOENT)
+ return 0;
+
+ fprintf(stderr, "Couldn't open dropped file %s\n", tmp);
+ return -1;
+ }
+
+ if (read(fd, tmp, sizeof(tmp)) < 0) {
+ perror(tmp);
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+
+ return atoi(tmp);
}
-static int start_trace(char *dev)
+static int start_trace(struct device_information *dip)
{
struct blk_user_trace_setup buts;
- memset(&buts, sizeof(buts), 0);
- buts.buf_size = BUF_SIZE;
- buts.buf_nr = BUF_NR;
+ memset(&buts, 0, sizeof(buts));
+ buts.buf_size = buf_size;
+ buts.buf_nr = buf_nr;
buts.act_mask = act_mask;
- if (ioctl(devfd, BLKSTARTTRACE, &buts) < 0) {
+ if (ioctl(dip->fd, BLKSTARTTRACE, &buts) < 0) {
perror("BLKSTARTTRACE");
return 1;
}
- trace_started = 1;
- buts_name_p = strdup(buts.name);
+ memcpy(dip->buts_name, buts.name, sizeof(dip->buts_name));
+ dip_set_tracing(dip, 1);
return 0;
}
-static void stop_trace(void)
+static void stop_trace(struct device_information *dip)
{
- if (trace_started || kill_running_trace) {
- if (ioctl(devfd, BLKSTOPTRACE) < 0)
+ if (dip_tracing(dip) || kill_running_trace) {
+ dip_set_tracing(dip, 0);
+
+ if (ioctl(dip->fd, BLKSTOPTRACE) < 0)
perror("BLKSTOPTRACE");
- trace_started = 0;
+ close(dip->fd);
+ dip->fd = -1;
}
}
-static void extract_data(struct thread_information *tip, char *ofn, int nb)
+static void stop_all_traces(void)
{
- int ret, bytes_left;
- unsigned char *buf, *p;
-
- buf = malloc(nb);
- p = buf;
- bytes_left = nb;
- while (bytes_left > 0) {
- ret = read(tip->fd, p, bytes_left);
- if (!ret)
- usleep(1000);
- else if (ret < 0) {
- perror(tip->fn);
- fprintf(stderr, "Thread %d extract_data %s failed\n",
- tip->cpu, tip->fn);
- free(buf);
- exit(1);
- } else {
- p += ret;
- bytes_left -= ret;
- }
- }
+ struct device_information *dip;
+ int i;
- ret = write(tip->ofd, buf, nb);
- if (ret != nb) {
- perror(ofn);
- fprintf(stderr,"Thread %d extract_data %s failed\n", tip->cpu, ofn);
- free(buf);
- exit(1);
+ for_each_dip(dip, i) {
+ dip->drop_count = get_dropped_count(dip->buts_name);
+ stop_trace(dip);
}
+}
+
+static void wait_for_data(struct thread_information *tip)
+{
+ struct pollfd pfd = { .fd = tip->fd, .events = POLLIN };
- free(buf);
+ do {
+ poll(&pfd, 1, 100);
+ if (pfd.revents & POLLIN)
+ break;
+ if (tip->ofile_stdout)
+ break;
+ } while (!is_done());
+}
+
+static int read_data(struct thread_information *tip, void *buf, int len)
+{
+ int ret = 0;
+
+ do {
+ wait_for_data(tip);
+
+ ret = read(tip->fd, buf, len);
+ if (!ret)
+ continue;
+ else if (ret > 0)
+ return ret;
+ else {
+ if (errno != EAGAIN) {
+ perror(tip->fn);
+ fprintf(stderr,"Thread %d failed read of %s\n",
+ tip->cpu, tip->fn);
+ break;
+ }
+ continue;
+ }
+ } while (!is_done());
+
+ return ret;
}
static inline void tip_fd_unlock(struct thread_information *tip)
{
- if (tip->fd_lock)
- pthread_mutex_unlock(tip->fd_lock);
+ pthread_mutex_unlock(&tip->lock);
}
static inline void tip_fd_lock(struct thread_information *tip)
{
- if (tip->fd_lock)
- pthread_mutex_lock(tip->fd_lock);
+ pthread_mutex_lock(&tip->lock);
+}
+
+static int get_subbuf(struct thread_information *tip)
+{
+ struct tip_subbuf *ts;
+ int ret;
+
+ ts = malloc(sizeof(*ts));
+ ts->buf = malloc(buf_size);
+ ts->max_len = buf_size;
+
+ ret = read_data(tip, ts->buf, ts->max_len);
+ if (ret > 0) {
+ ts->len = ret;
+ tip_fd_lock(tip);
+ list_add_tail(&ts->list, &tip->subbuf_list);
+ tip_fd_unlock(tip);
+ return 0;
+ }
+
+ free(ts->buf);
+ free(ts);
+ return -1;
+}
+
+static void close_thread(struct thread_information *tip)
+{
+ if (tip->fd != -1)
+ close(tip->fd);
+ if (tip->ofile)
+ fclose(tip->ofile);
+ if (tip->ofile_buffer)
+ free(tip->ofile_buffer);
+ if (tip->fd_buf)
+ free(tip->fd_buf);
+
+ tip->fd = -1;
+ tip->ofile = NULL;
+ tip->ofile_buffer = NULL;
+ tip->fd_buf = NULL;
}
-static void *extract(void *arg)
+static void *thread_main(void *arg)
{
struct thread_information *tip = arg;
- int ret, pdu_len;
- char dp[64];
- struct blk_io_trace t;
pid_t pid = getpid();
cpu_set_t cpu_mask;
if (sched_setaffinity(pid, sizeof(cpu_mask), &cpu_mask) == -1) {
perror("sched_setaffinity");
- exit(1);
+ exit_trace(1);
}
- snprintf(tip->fn, sizeof(tip->fn),
- "%s/block/%s/trace%d", relay_path, buts_name_p, tip->cpu);
+ snprintf(tip->fn, sizeof(tip->fn), "%s/block/%s/trace%d",
+ relay_path, tip->device->buts_name, tip->cpu);
tip->fd = open(tip->fn, O_RDONLY);
if (tip->fd < 0) {
perror(tip->fn);
fprintf(stderr,"Thread %d failed open of %s\n", tip->cpu,
tip->fn);
- exit(1);
+ exit_trace(1);
}
- while (!is_done()) {
- ret = read(tip->fd, &t, sizeof(t));
- if (ret != sizeof(t)) {
- if (ret < 0) {
- perror(tip->fn);
- fprintf(stderr,"Thread %d failed read of %s\n",
- tip->cpu, tip->fn);
- exit(1);
- } else if (ret > 0) {
- fprintf(stderr,"Thread %d misread %s %d,%d\n",
- tip->cpu, tip->fn, ret, (int)sizeof(t));
- exit(1);
- } else {
- usleep(10000);
- continue;
- }
- }
-
- if (verify_trace(&t))
- exit(1);
+ for (;;) {
+ if (get_subbuf(tip))
+ break;
+ }
- pdu_len = t.pdu_len;
+ tip->exited = 1;
+ return NULL;
+}
- trace_to_be(&t);
+static int write_data(struct thread_information *tip,
+ void *buf, unsigned int buf_len)
+{
+ int ret;
- tip_fd_lock(tip);
+ while (1) {
+ ret = fwrite(buf, buf_len, 1, tip->ofile);
+ if (ret == 1)
+ break;
- ret = write(tip->ofd, &t, sizeof(t));
if (ret < 0) {
- fprintf(stderr,"Thread %d failed write\n", tip->cpu);
- tip_fd_unlock(tip);
- exit(1);
+ perror("write");
+ return 1;
}
+ }
- if (pdu_len)
- extract_data(tip, dp, pdu_len);
+ if (tip->ofile_stdout)
+ fflush(tip->ofile);
- tip_fd_unlock(tip);
+ return 0;
+}
+
+static int flush_subbuf(struct thread_information *tip, struct tip_subbuf *ts)
+{
+ unsigned int offset = 0;
+ struct blk_io_trace *t;
+ int pdu_len, events = 0;
+
+ /*
+ * surplus from last run
+ */
+ if (tip->leftover_ts) {
+ struct tip_subbuf *prev_ts = tip->leftover_ts;
+
+ if (prev_ts->len + ts->len > prev_ts->max_len) {
+ prev_ts->max_len += ts->len;
+ prev_ts->buf = realloc(prev_ts->buf, prev_ts->max_len);
+ }
+
+ memcpy(prev_ts->buf + prev_ts->len, ts->buf, ts->len);
+ prev_ts->len += ts->len;
+ free(ts->buf);
+ free(ts);
+
+ ts = prev_ts;
+ tip->leftover_ts = NULL;
+ }
+
+ while (offset + sizeof(*t) <= ts->len) {
+ t = ts->buf + offset;
+
+ if (verify_trace(t))
+ return -1;
+
+ pdu_len = t->pdu_len;
+
+ if (offset + sizeof(*t) + pdu_len > ts->len)
+ break;
+
+ trace_to_be(t);
+
+ if (write_data(tip, t, sizeof(*t) + pdu_len))
+ return -1;
+
+ offset += sizeof(*t) + pdu_len;
tip->events_processed++;
+ events++;
}
- return NULL;
+ /*
+ * leftover bytes, save them for next time
+ */
+ if (offset != ts->len) {
+ tip->leftover_ts = ts;
+ ts->len -= offset;
+ memmove(ts->buf, ts->buf + offset, ts->len);
+ } else {
+ free(ts->buf);
+ free(ts);
+ }
+
+ return events;
+}
+
+static int write_tip_events(struct thread_information *tip)
+{
+ struct tip_subbuf *ts = NULL;
+
+ tip_fd_lock(tip);
+ if (!list_empty(&tip->subbuf_list)) {
+ ts = list_entry(tip->subbuf_list.next, struct tip_subbuf, list);
+ list_del(&ts->list);
+ }
+ tip_fd_unlock(tip);
+
+ if (ts)
+ return flush_subbuf(tip, ts);
+
+ return 0;
}
-static int start_threads(void)
+/*
+ * scans the tips we know and writes out the subbuffers we accumulate
+ */
+static void get_and_write_events(void)
{
+ struct device_information *dip;
struct thread_information *tip;
- char op[64];
- int i;
+ int i, j, events, ret, tips_running;
- ncpus = sysconf(_SC_NPROCESSORS_ONLN);
- if (ncpus < 0) {
- fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed\n");
- return 1;
+ while (!is_done()) {
+ events = 0;
+
+ for_each_dip(dip, i) {
+ for_each_tip(dip, tip, j) {
+ ret = write_tip_events(tip);
+ if (ret > 0)
+ events += ret;
+ }
+ }
+
+ if (!events)
+ usleep(10);
}
- thread_information = malloc(ncpus * sizeof(struct thread_information));
- for (i = 0, tip = thread_information; i < ncpus; i++, tip++) {
- tip->fd_lock = NULL;
- tip->cpu = i;
- tip->events_processed = 0;
+ /*
+ * reap stored events
+ */
+ do {
+ events = 0;
+ tips_running = 0;
+ for_each_dip(dip, i) {
+ for_each_tip(dip, tip, j) {
+ ret = write_tip_events(tip);
+ if (ret > 0)
+ events += ret;
+ tips_running += !tip->exited;
+ }
+ }
+ usleep(10);
+ } while (events || tips_running);
+}
+
+static int start_threads(struct device_information *dip)
+{
+ struct thread_information *tip;
+ char op[64];
+ int j, pipeline = output_name && !strcmp(output_name, "-");
+ int len, mode, vbuf_size;
- if (!strcmp(output_name, "-")) {
- tip->ofd = dup(1);
- tip->fd_lock = &stdout_mutex;
+ for_each_tip(dip, tip, j) {
+ tip->cpu = j;
+ tip->device = dip;
+ tip->events_processed = 0;
+ pthread_mutex_init(&tip->lock, NULL);
+ INIT_LIST_HEAD(&tip->subbuf_list);
+ tip->leftover_ts = NULL;
+
+ if (pipeline) {
+ tip->ofile = fdopen(STDOUT_FILENO, "w");
+ tip->ofile_stdout = 1;
+ mode = _IOLBF;
+ vbuf_size = 512;
} else {
- sprintf(op, "%s_out.%d", output_name, tip->cpu);
- tip->ofd = open(op, O_CREAT|O_TRUNC|O_WRONLY, 0644);
+ len = 0;
+
+ if (output_dir)
+ len = sprintf(op, "%s/", output_dir);
+
+ if (output_name) {
+ sprintf(op + len, "%s.blktrace.%d", output_name,
+ tip->cpu);
+ } else {
+ sprintf(op + len, "%s.blktrace.%d",
+ dip->buts_name, tip->cpu);
+ }
+ tip->ofile = fopen(op, "w");
+ tip->ofile_stdout = 0;
+ mode = _IOFBF;
+ vbuf_size = OFILE_BUF;
}
- if (tip->ofd < 0) {
+ if (tip->ofile == NULL) {
perror(op);
return 1;
}
- if (pthread_create(&tip->thread, NULL, extract, tip)) {
- perror( "pthread_create");
- return 0;
+ tip->ofile_buffer = malloc(vbuf_size);
+ if (setvbuf(tip->ofile, tip->ofile_buffer, mode, vbuf_size)) {
+ perror("setvbuf");
+ close_thread(tip);
+ return 1;
+ }
+
+ if (pthread_create(&tip->thread, NULL, thread_main, tip)) {
+ perror("pthread_create");
+ close_thread(tip);
+ return 1;
}
}
- return ncpus;
+ return 0;
+}
+
+static void stop_threads(struct device_information *dip)
+{
+ struct thread_information *tip;
+ unsigned long ret;
+ int i;
+
+ for_each_tip(dip, tip, i) {
+ (void) pthread_join(tip->thread, (void *) &ret);
+ close_thread(tip);
+ }
}
-static void stop_threads(void)
+static void stop_all_threads(void)
{
- struct thread_information *tip = thread_information;
+ struct device_information *dip;
int i;
- for (i = 0; i < ncpus; i++, tip++) {
- int ret;
+ for_each_dip(dip, i)
+ stop_threads(dip);
+}
- if (pthread_join(tip->thread, (void *) &ret))
- perror("thread_join");
+static void stop_all_tracing(void)
+{
+ struct device_information *dip;
+ int i;
- close(tip->fd);
- close(tip->ofd);
+ for_each_dip(dip, i)
+ stop_trace(dip);
+}
+
+static void exit_trace(int status)
+{
+ if (!is_trace_stopped()) {
+ trace_stopped = 1;
+ stop_all_threads();
+ stop_all_tracing();
+ }
+
+ exit(status);
+}
+
+static int resize_devices(char *path)
+{
+ int size = (ndevs + 1) * sizeof(struct device_information);
+
+ device_information = realloc(device_information, size);
+ if (!device_information) {
+ fprintf(stderr, "Out of memory, device %s (%d)\n", path, size);
+ return 1;
}
+ device_information[ndevs].path = path;
+ ndevs++;
+ return 0;
}
-void show_stats(void)
+static int open_devices(void)
{
+ struct device_information *dip;
int i;
+
+ for_each_dip(dip, i) {
+ dip->fd = open(dip->path, O_RDONLY | O_NONBLOCK);
+ if (dip->fd < 0) {
+ perror(dip->path);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static int start_devices(void)
+{
+ struct device_information *dip;
+ int i, j, size;
+
+ size = ncpus * sizeof(struct thread_information);
+ thread_information = malloc(size * ndevs);
+ if (!thread_information) {
+ fprintf(stderr, "Out of memory, threads (%d)\n", size * ndevs);
+ return 1;
+ }
+
+ for_each_dip(dip, i) {
+ if (start_trace(dip)) {
+ close(dip->fd);
+ fprintf(stderr, "Failed to start trace on %s\n",
+ dip->path);
+ break;
+ }
+ }
+
+ if (i != ndevs) {
+ __for_each_dip(dip, j, i)
+ stop_trace(dip);
+
+ return 1;
+ }
+
+ for_each_dip(dip, i) {
+ dip->threads = thread_information + (i * ncpus);
+ if (start_threads(dip)) {
+ fprintf(stderr, "Failed to start worker threads\n");
+ break;
+ }
+ }
+
+ if (i != ndevs) {
+ __for_each_dip(dip, j, i)
+ stop_threads(dip);
+ for_each_dip(dip, i)
+ stop_trace(dip);
+
+ return 1;
+ }
+
+ return 0;
+}
+
+static void show_stats(void)
+{
+ struct device_information *dip;
struct thread_information *tip;
- unsigned long events_processed = 0;
+ unsigned long long events_processed;
+ unsigned long total_drops;
+ int i, j, no_stdout = 0;
- if (!strcmp(output_name, "-"))
+ if (is_stat_shown())
return;
- for (i = 0, tip = thread_information; i < ncpus; i++, tip++) {
- printf("CPU%3d: %20ld events\n",
- tip->cpu, tip->events_processed);
- events_processed += tip->events_processed;
+ if (output_name && !strcmp(output_name, "-"))
+ no_stdout = 1;
+
+ stat_shown = 1;
+
+ total_drops = 0;
+ for_each_dip(dip, i) {
+ if (!no_stdout)
+ printf("Device: %s\n", dip->path);
+ events_processed = 0;
+ for_each_tip(dip, tip, j) {
+ if (!no_stdout)
+ printf(" CPU%3d: %20ld events\n",
+ tip->cpu, tip->events_processed);
+ events_processed += tip->events_processed;
+ }
+ total_drops += dip->drop_count;
+ if (!no_stdout)
+ printf(" Total: %20lld events (dropped %lu)\n",
+ events_processed, dip->drop_count);
}
- printf("Total: %20ld events\n", events_processed);
+ if (total_drops)
+ fprintf(stderr, "You have dropped events, consider using a larger buffer size (-b)\n");
}
-void handle_sigint(int sig)
+static char usage_str[] = \
+ "-d <dev> [ -r relay path ] [ -o <output> ] [-k ] [ -w time ]\n" \
+ "[ -a action ] [ -A action mask ] [ -v ]\n\n" \
+ "\t-d Use specified device. May also be given last after options\n" \
+ "\t-r Path to mounted relayfs, defaults to /relay\n" \
+ "\t-o File(s) to send output to\n" \
+ "\t-D Directory to prepend to output file names\n" \
+ "\t-k Kill a running trace\n" \
+ "\t-w Stop after defined time, in seconds\n" \
+ "\t-a Only trace specified actions. See documentation\n" \
+ "\t-A Give trace mask as a single value. See documentation\n" \
+ "\t-b Sub buffer size in KiB\n" \
+ "\t-n Number of sub buffers\n" \
+ "\t-v Print program version info\n\n";
+
+static void show_usage(char *program)
+{
+ fprintf(stderr, "Usage: %s %s %s",program, blktrace_version, usage_str);
+}
+static void handle_sigint(__attribute__((__unused__)) int sig)
{
done = 1;
}
int main(int argc, char *argv[])
{
static char default_relay_path[] = "/relay";
- struct stat st;
+ struct statfs st;
int i, c;
+ int stop_watch = 0;
int act_mask_tmp = 0;
while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) >= 0) {
case 'a':
i = find_mask_map(optarg);
if (i < 0) {
- fprintf(stderr,"Invalid action mask %s\n",
+ fprintf(stderr,"Invalid action mask %s\n",
optarg);
- return 4;
+ return 1;
}
act_mask_tmp |= i;
break;
case 'A':
- if ((sscanf(optarg, "%x", &i) != 1) || !VALID_SET(i)) {
+ if ((sscanf(optarg, "%x", &i) != 1) ||
+ !valid_act_opt(i)) {
fprintf(stderr,
- "Invalid set action mask %s/0x%x\n",
+ "Invalid set action mask %s/0x%x\n",
optarg, i);
- return 4;
+ return 1;
}
act_mask_tmp = i;
break;
case 'd':
- dev = strdup(optarg);
+ if (resize_devices(optarg) != 0)
+ return 1;
break;
case 'r':
break;
case 'o':
- output_name = strdup(optarg);
+ output_name = optarg;
break;
case 'k':
kill_running_trace = 1;
break;
-
+ case 'w':
+ stop_watch = atoi(optarg);
+ if (stop_watch <= 0) {
+ fprintf(stderr,
+ "Invalid stopwatch value (%d secs)\n",
+ stop_watch);
+ return 1;
+ }
+ break;
+ case 'V':
+ printf("%s version %s\n", argv[0], blktrace_version);
+ return 0;
+ case 'b':
+ buf_size = strtoul(optarg, NULL, 10);
+ if (buf_size <= 0 || buf_size > 16*1024) {
+ fprintf(stderr,
+ "Invalid buffer size (%lu)\n",buf_size);
+ return 1;
+ }
+ buf_size <<= 10;
+ break;
+ case 'n':
+ buf_nr = strtoul(optarg, NULL, 10);
+ if (buf_nr <= 0) {
+ fprintf(stderr,
+ "Invalid buffer nr (%lu)\n", buf_nr);
+ return 1;
+ }
+ break;
+ case 'D':
+ output_dir = optarg;
+ break;
default:
- fprintf(stderr,"Usage: %s -d <dev> "
- "[-a <trace> [-a <trace>]]\n", argv[0]);
- return 4;
+ show_usage(argv[0]);
+ return 1;
}
}
- if ((dev == NULL) || (optind < argc)) {
- fprintf(stderr,"Usage: %s -d <dev> "
- "[-a <trace> [-a <trace>]]\n", argv[0]);
- return 4;
+ while (optind < argc) {
+ if (resize_devices(argv[optind++]) != 0)
+ return 1;
+ }
+
+ if (ndevs == 0) {
+ show_usage(argv[0]);
+ return 1;
}
if (!relay_path)
if (act_mask_tmp != 0)
act_mask = act_mask_tmp;
- if (stat(relay_path, &st) < 0) {
- fprintf(stderr,"%s does not appear to be mounted\n",
+ if (statfs(relay_path, &st) < 0) {
+ perror("statfs");
+ fprintf(stderr,"%s does not appear to be a valid path\n",
+ relay_path);
+ return 1;
+ } else if (st.f_type != (long) RELAYFS_TYPE) {
+ fprintf(stderr,"%s does not appear to be a relay filesystem\n",
relay_path);
- return 2;
+ return 1;
}
- devfd = open(dev, O_RDONLY);
- if (devfd < 0) {
- perror(dev);
- return 3;
- }
+ if (open_devices() != 0)
+ return 1;
if (kill_running_trace) {
- stop_trace();
- exit(0);
- }
-
- if (start_trace(dev)) {
- close(devfd);
- fprintf(stderr, "Failed to start trace on %s\n", dev);
- return 4;
+ stop_all_traces();
+ return 0;
}
setlocale(LC_NUMERIC, "en_US");
- if (!output_name)
- output_name = strdup(buts_name_p);
-
- i = start_threads();
- if (!i) {
- fprintf(stderr, "Failed to start worker threads\n");
- stop_trace();
- return 5;
+ ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ if (ncpus < 0) {
+ fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed\n");
+ return 1;
}
+ if (start_devices() != 0)
+ return 1;
+
signal(SIGINT, handle_sigint);
signal(SIGHUP, handle_sigint);
signal(SIGTERM, handle_sigint);
+ signal(SIGALRM, handle_sigint);
+
+ atexit(stop_all_tracing);
- atexit(stop_trace);
+ if (stop_watch)
+ alarm(stop_watch);
- while (!is_done())
- sleep(1);
+ get_and_write_events();
+
+ if (!is_trace_stopped()) {
+ trace_stopped = 1;
+ stop_all_threads();
+ stop_all_traces();
+ }
- stop_threads();
- stop_trace();
show_stats();
- close(devfd);
return 0;
}
projects / blktrace.git / blobdiff