diff options
Diffstat (limited to 'blktrace.c')
| -rw-r--r-- | blktrace.c | 569 |
1 files changed, 0 insertions, 569 deletions
diff --git a/blktrace.c b/blktrace.c deleted file mode 100644 index a3474cb5..00000000 --- a/blktrace.c +++ /dev/null @@ -1,569 +0,0 @@ -/* - * blktrace support code for fio - */ -#include <stdio.h> -#include <stdlib.h> -#include <sys/stat.h> -#include <sys/ioctl.h> -#include <linux/fs.h> -#include <dirent.h> - -#include "flist.h" -#include "fio.h" -#include "blktrace_api.h" -#include "oslib/linux-dev-lookup.h" - -#define TRACE_FIFO_SIZE 8192 - -/* - * fifo refill frontend, to avoid reading data in trace sized bites - */ -static int refill_fifo(struct thread_data *td, struct fifo *fifo, int fd) -{ - char buf[TRACE_FIFO_SIZE]; - unsigned int total; - int ret; - - total = sizeof(buf); - if (total > fifo_room(fifo)) - total = fifo_room(fifo); - - ret = read(fd, buf, total); - if (ret < 0) { - td_verror(td, errno, "read blktrace file"); - return -1; - } - - if (ret > 0) - ret = fifo_put(fifo, buf, ret); - - dprint(FD_BLKTRACE, "refill: filled %d bytes\n", ret); - return ret; -} - -/* - * Retrieve 'len' bytes from the fifo, refilling if necessary. - */ -static int trace_fifo_get(struct thread_data *td, struct fifo *fifo, int fd, - void *buf, unsigned int len) -{ - if (fifo_len(fifo) < len) { - int ret = refill_fifo(td, fifo, fd); - - if (ret < 0) - return ret; - } - - return fifo_get(fifo, buf, len); -} - -/* - * Just discard the pdu by seeking past it. - */ -static int discard_pdu(struct thread_data *td, struct fifo *fifo, int fd, - struct blk_io_trace *t) -{ - if (t->pdu_len == 0) - return 0; - - dprint(FD_BLKTRACE, "discard pdu len %u\n", t->pdu_len); - return trace_fifo_get(td, fifo, fd, NULL, t->pdu_len); -} - -/* - * Check if this is a blktrace binary data file. We read a single trace - * into memory and check for the magic signature. - */ -int is_blktrace(const char *filename, int *need_swap) -{ - struct blk_io_trace t; - int fd, ret; - - fd = open(filename, O_RDONLY); - if (fd < 0) - return 0; - - ret = read(fd, &t, sizeof(t)); - close(fd); - - if (ret < 0) { - perror("read blktrace"); - return 0; - } else if (ret != sizeof(t)) { - log_err("fio: short read on blktrace file\n"); - return 0; - } - - if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC) { - *need_swap = 0; - return 1; - } - - /* - * Maybe it needs to be endian swapped... - */ - t.magic = fio_swap32(t.magic); - if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC) { - *need_swap = 1; - return 1; - } - - return 0; -} - -#define FMINORBITS 20 -#define FMINORMASK ((1U << FMINORBITS) - 1) -#define FMAJOR(dev) ((unsigned int) ((dev) >> FMINORBITS)) -#define FMINOR(dev) ((unsigned int) ((dev) & FMINORMASK)) - -static void trace_add_open_close_event(struct thread_data *td, int fileno, enum file_log_act action) -{ - struct io_piece *ipo; - - ipo = calloc(1, sizeof(*ipo)); - init_ipo(ipo); - - ipo->ddir = DDIR_INVAL; - ipo->fileno = fileno; - ipo->file_action = action; - flist_add_tail(&ipo->list, &td->io_log_list); -} - -static int get_dev_blocksize(const char *dev, unsigned int *bs) -{ - int fd; - - fd = open(dev, O_RDONLY); - if (fd < 0) - return 1; - - if (ioctl(fd, BLKSSZGET, bs) < 0) { - close(fd); - return 1; - } - - close(fd); - return 0; -} - -static int trace_add_file(struct thread_data *td, __u32 device, - unsigned int *bs) -{ - static unsigned int last_maj, last_min, last_fileno, last_bs; - unsigned int maj = FMAJOR(device); - unsigned int min = FMINOR(device); - struct fio_file *f; - unsigned int i; - char dev[256]; - - if (last_maj == maj && last_min == min) { - *bs = last_bs; - return last_fileno; - } - - last_maj = maj; - last_min = min; - - /* - * check for this file in our list - */ - for_each_file(td, f, i) { - if (f->major == maj && f->minor == min) { - last_fileno = f->fileno; - last_bs = f->bs; - goto out; - } - } - - strcpy(dev, "/dev"); - if (blktrace_lookup_device(td->o.replay_redirect, dev, maj, min)) { - unsigned int this_bs; - int fileno; - - if (td->o.replay_redirect) - dprint(FD_BLKTRACE, "device lookup: %d/%d\n overridden" - " with: %s\n", maj, min, - td->o.replay_redirect); - else - dprint(FD_BLKTRACE, "device lookup: %d/%d\n", maj, min); - - dprint(FD_BLKTRACE, "add devices %s\n", dev); - fileno = add_file_exclusive(td, dev); - - if (get_dev_blocksize(dev, &this_bs)) - this_bs = 512; - - td->o.open_files++; - td->files[fileno]->major = maj; - td->files[fileno]->minor = min; - td->files[fileno]->bs = this_bs; - trace_add_open_close_event(td, fileno, FIO_LOG_OPEN_FILE); - - last_fileno = fileno; - last_bs = this_bs; - } - -out: - *bs = last_bs; - return last_fileno; -} - -static void t_bytes_align(struct thread_options *o, struct blk_io_trace *t) -{ - if (!o->replay_align) - return; - - t->bytes = (t->bytes + o->replay_align - 1) & ~(o->replay_align - 1); -} - -/* - * Store blk_io_trace data in an ipo for later retrieval. - */ -static void store_ipo(struct thread_data *td, unsigned long long offset, - unsigned int bytes, int rw, unsigned long long ttime, - int fileno, unsigned int bs) -{ - struct io_piece *ipo = malloc(sizeof(*ipo)); - - init_ipo(ipo); - - ipo->offset = offset * bs; - if (td->o.replay_scale) - ipo->offset = ipo->offset / td->o.replay_scale; - ipo_bytes_align(td->o.replay_align, ipo); - ipo->len = bytes; - ipo->delay = ttime / 1000; - if (rw) - ipo->ddir = DDIR_WRITE; - else - ipo->ddir = DDIR_READ; - ipo->fileno = fileno; - - dprint(FD_BLKTRACE, "store ddir=%d, off=%llu, len=%lu, delay=%lu\n", - ipo->ddir, ipo->offset, - ipo->len, ipo->delay); - queue_io_piece(td, ipo); -} - -static void handle_trace_notify(struct blk_io_trace *t) -{ - switch (t->action) { - case BLK_TN_PROCESS: - dprint(FD_BLKTRACE, "got process notify: %x, %d\n", - t->action, t->pid); - break; - case BLK_TN_TIMESTAMP: - dprint(FD_BLKTRACE, "got timestamp notify: %x, %d\n", - t->action, t->pid); - break; - case BLK_TN_MESSAGE: - break; - default: - dprint(FD_BLKTRACE, "unknown trace act %x\n", t->action); - break; - } -} - -static void handle_trace_discard(struct thread_data *td, - struct blk_io_trace *t, - unsigned long long ttime, - unsigned long *ios, unsigned int *rw_bs) -{ - struct io_piece *ipo = malloc(sizeof(*ipo)); - unsigned int bs; - int fileno; - - init_ipo(ipo); - fileno = trace_add_file(td, t->device, &bs); - - ios[DDIR_TRIM]++; - if (t->bytes > rw_bs[DDIR_TRIM]) - rw_bs[DDIR_TRIM] = t->bytes; - - td->o.size += t->bytes; - - memset(ipo, 0, sizeof(*ipo)); - INIT_FLIST_HEAD(&ipo->list); - - ipo->offset = t->sector * bs; - if (td->o.replay_scale) - ipo->offset = ipo->offset / td->o.replay_scale; - ipo_bytes_align(td->o.replay_align, ipo); - ipo->len = t->bytes; - ipo->delay = ttime / 1000; - ipo->ddir = DDIR_TRIM; - ipo->fileno = fileno; - - dprint(FD_BLKTRACE, "store discard, off=%llu, len=%lu, delay=%lu\n", - ipo->offset, ipo->len, - ipo->delay); - queue_io_piece(td, ipo); -} - -static void handle_trace_fs(struct thread_data *td, struct blk_io_trace *t, - unsigned long long ttime, unsigned long *ios, - unsigned int *rw_bs) -{ - unsigned int bs; - int rw; - int fileno; - - fileno = trace_add_file(td, t->device, &bs); - - rw = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0; - - if (t->bytes > rw_bs[rw]) - rw_bs[rw] = t->bytes; - - ios[rw]++; - td->o.size += t->bytes; - store_ipo(td, t->sector, t->bytes, rw, ttime, fileno, bs); -} - -/* - * We only care for queue traces, most of the others are side effects - * due to internal workings of the block layer. - */ -static void handle_trace(struct thread_data *td, struct blk_io_trace *t, - unsigned long *ios, unsigned int *bs) -{ - static unsigned long long last_ttime; - unsigned long long delay = 0; - - if ((t->action & 0xffff) != __BLK_TA_QUEUE) - return; - - if (!(t->action & BLK_TC_ACT(BLK_TC_NOTIFY))) { - if (!last_ttime || td->o.no_stall) { - last_ttime = t->time; - delay = 0; - } else { - delay = t->time - last_ttime; - last_ttime = t->time; - } - } - - t_bytes_align(&td->o, t); - - if (t->action & BLK_TC_ACT(BLK_TC_NOTIFY)) - handle_trace_notify(t); - else if (t->action & BLK_TC_ACT(BLK_TC_DISCARD)) - handle_trace_discard(td, t, delay, ios, bs); - else - handle_trace_fs(td, t, delay, ios, bs); -} - -static void byteswap_trace(struct blk_io_trace *t) -{ - t->magic = fio_swap32(t->magic); - t->sequence = fio_swap32(t->sequence); - t->time = fio_swap64(t->time); - t->sector = fio_swap64(t->sector); - t->bytes = fio_swap32(t->bytes); - t->action = fio_swap32(t->action); - t->pid = fio_swap32(t->pid); - t->device = fio_swap32(t->device); - t->cpu = fio_swap32(t->cpu); - t->error = fio_swap16(t->error); - t->pdu_len = fio_swap16(t->pdu_len); -} - -static int t_is_write(struct blk_io_trace *t) -{ - return (t->action & BLK_TC_ACT(BLK_TC_WRITE | BLK_TC_DISCARD)) != 0; -} - -static enum fio_ddir t_get_ddir(struct blk_io_trace *t) -{ - if (t->action & BLK_TC_ACT(BLK_TC_READ)) - return DDIR_READ; - else if (t->action & BLK_TC_ACT(BLK_TC_WRITE)) - return DDIR_WRITE; - else if (t->action & BLK_TC_ACT(BLK_TC_DISCARD)) - return DDIR_TRIM; - - return DDIR_INVAL; -} - -static void depth_inc(struct blk_io_trace *t, int *depth) -{ - enum fio_ddir ddir; - - ddir = t_get_ddir(t); - if (ddir != DDIR_INVAL) - depth[ddir]++; -} - -static void depth_dec(struct blk_io_trace *t, int *depth) -{ - enum fio_ddir ddir; - - ddir = t_get_ddir(t); - if (ddir != DDIR_INVAL) - depth[ddir]--; -} - -static void depth_end(struct blk_io_trace *t, int *this_depth, int *depth) -{ - enum fio_ddir ddir = DDIR_INVAL; - - ddir = t_get_ddir(t); - if (ddir != DDIR_INVAL) { - depth[ddir] = max(depth[ddir], this_depth[ddir]); - this_depth[ddir] = 0; - } -} - -/* - * Load a blktrace file by reading all the blk_io_trace entries, and storing - * them as io_pieces like the fio text version would do. - */ -int load_blktrace(struct thread_data *td, const char *filename, int need_swap) -{ - struct blk_io_trace t; - unsigned long ios[DDIR_RWDIR_CNT], skipped_writes; - unsigned int rw_bs[DDIR_RWDIR_CNT]; - struct fifo *fifo; - int fd, i, old_state; - struct fio_file *f; - int this_depth[DDIR_RWDIR_CNT], depth[DDIR_RWDIR_CNT], max_depth; - - fd = open(filename, O_RDONLY); - if (fd < 0) { - td_verror(td, errno, "open blktrace file"); - return 1; - } - - fifo = fifo_alloc(TRACE_FIFO_SIZE); - - old_state = td_bump_runstate(td, TD_SETTING_UP); - - td->o.size = 0; - - for (i = 0; i < DDIR_RWDIR_CNT; i++) { - ios[i] = 0; - rw_bs[i] = 0; - this_depth[i] = 0; - depth[i] = 0; - } - - skipped_writes = 0; - do { - int ret = trace_fifo_get(td, fifo, fd, &t, sizeof(t)); - - if (ret < 0) - goto err; - else if (!ret) - break; - else if (ret < (int) sizeof(t)) { - log_err("fio: short fifo get\n"); - break; - } - - if (need_swap) - byteswap_trace(&t); - - if ((t.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) { - log_err("fio: bad magic in blktrace data: %x\n", - t.magic); - goto err; - } - if ((t.magic & 0xff) != BLK_IO_TRACE_VERSION) { - log_err("fio: bad blktrace version %d\n", - t.magic & 0xff); - goto err; - } - ret = discard_pdu(td, fifo, fd, &t); - if (ret < 0) { - td_verror(td, ret, "blktrace lseek"); - goto err; - } else if (t.pdu_len != ret) { - log_err("fio: discarded %d of %d\n", ret, t.pdu_len); - goto err; - } - if ((t.action & BLK_TC_ACT(BLK_TC_NOTIFY)) == 0) { - if ((t.action & 0xffff) == __BLK_TA_QUEUE) - depth_inc(&t, this_depth); - else if (((t.action & 0xffff) == __BLK_TA_BACKMERGE) || - ((t.action & 0xffff) == __BLK_TA_FRONTMERGE)) - depth_dec(&t, this_depth); - else if ((t.action & 0xffff) == __BLK_TA_COMPLETE) - depth_end(&t, this_depth, depth); - - if (t_is_write(&t) && read_only) { - skipped_writes++; - continue; - } - } - - handle_trace(td, &t, ios, rw_bs); - } while (1); - - for (i = 0; i < td->files_index; i++) { - f = td->files[i]; - trace_add_open_close_event(td, f->fileno, FIO_LOG_CLOSE_FILE); - } - - fifo_free(fifo); - close(fd); - - td_restore_runstate(td, old_state); - - if (!td->files_index) { - log_err("fio: did not find replay device(s)\n"); - return 1; - } - - /* - * For stacked devices, we don't always get a COMPLETE event so - * the depth grows to insane values. Limit it to something sane(r). - */ - max_depth = 0; - for (i = 0; i < DDIR_RWDIR_CNT; i++) { - if (depth[i] > 1024) - depth[i] = 1024; - else if (!depth[i] && ios[i]) - depth[i] = 1; - max_depth = max(depth[i], max_depth); - } - - if (skipped_writes) - log_err("fio: %s skips replay of %lu writes due to read-only\n", - td->o.name, skipped_writes); - - if (!ios[DDIR_READ] && !ios[DDIR_WRITE]) { - log_err("fio: found no ios in blktrace data\n"); - return 1; - } else if (ios[DDIR_READ] && !ios[DDIR_WRITE]) { - td->o.td_ddir = TD_DDIR_READ; - td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; - } else if (!ios[DDIR_READ] && ios[DDIR_WRITE]) { - td->o.td_ddir = TD_DDIR_WRITE; - td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; - } else { - td->o.td_ddir = TD_DDIR_RW; - td->o.max_bs[DDIR_READ] = rw_bs[DDIR_READ]; - td->o.max_bs[DDIR_WRITE] = rw_bs[DDIR_WRITE]; - td->o.max_bs[DDIR_TRIM] = rw_bs[DDIR_TRIM]; - } - - /* - * We need to do direct/raw ios to the device, to avoid getting - * read-ahead in our way. But only do so if the minimum block size - * is a multiple of 4k, otherwise we don't know if it's safe to do so. - */ - if (!fio_option_is_set(&td->o, odirect) && !(td_min_bs(td) & 4095)) - td->o.odirect = 1; - - /* - * If depth wasn't manually set, use probed depth - */ - if (!fio_option_is_set(&td->o, iodepth)) - td->o.iodepth = td->o.iodepth_low = max_depth; - - return 0; -err: - close(fd); - fifo_free(fifo); - return 1; -} |