+/*
+ * Code related to writing an iolog of what a thread is doing, and to
+ * later read that back and replay
+ */
#include <stdio.h>
#include <stdlib.h>
+#include <assert.h>
#include "list.h"
#include "fio.h"
-void write_iolog_put(struct thread_data *td, struct io_u *io_u)
+static const char iolog_ver2[] = "fio version 2 iolog";
+
+void log_io_u(struct thread_data *td, struct io_u *io_u)
+{
+ const char *act[] = { "read", "write", "sync" };
+
+ assert(io_u->ddir < 3);
+
+ if (!td->o.write_iolog_file)
+ return;
+
+ fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name, act[io_u->ddir], io_u->offset, io_u->buflen);
+}
+
+void log_file(struct thread_data *td, struct fio_file *f,
+ enum file_log_act what)
+{
+ const char *act[] = { "add", "open", "close" };
+
+ assert(what < 3);
+
+ if (!td->o.write_iolog_file)
+ return;
+
+ fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
+}
+
+static void iolog_delay(struct thread_data *td, unsigned long delay)
{
- fprintf(td->iolog_f, "%u,%llu,%lu\n", io_u->ddir, io_u->offset, io_u->buflen);
+ unsigned long usec = utime_since_now(&td->last_issue);
+
+ if (delay < usec)
+ return;
+
+ delay -= usec;
+
+ /*
+ * less than 100 usec delay, just regard it as noise
+ */
+ if (delay < 100)
+ return;
+
+ usec_sleep(td, delay);
}
int read_iolog_get(struct thread_data *td, struct io_u *io_u)
{
struct io_piece *ipo;
- if (!list_empty(&td->io_log_list)) {
+ while (!list_empty(&td->io_log_list)) {
ipo = list_entry(td->io_log_list.next, struct io_piece, list);
list_del(&ipo->list);
+
+ /*
+ * invalid ddir, this is a file action
+ */
+ if (ipo->ddir == DDIR_INVAL) {
+ struct fio_file *f = &td->files[ipo->fileno];
+
+ if (ipo->file_action == FIO_LOG_OPEN_FILE) {
+ assert(!td_io_open_file(td, f));
+ free(ipo);
+ continue;
+ } else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
+ td_io_close_file(td, f);
+ free(ipo);
+ continue;
+ }
+ }
+
io_u->offset = ipo->offset;
io_u->buflen = ipo->len;
io_u->ddir = ipo->ddir;
- io_u->file = ipo->file;
+ io_u->file = &td->files[ipo->fileno];
+ get_file(io_u->file);
+
+ if (ipo->delay)
+ iolog_delay(td, ipo->delay);
+
free(ipo);
return 0;
}
+ td->done = 1;
return 1;
}
fflush(td->iolog_f);
fclose(td->iolog_f);
free(td->iolog_buf);
+ td->iolog_f = NULL;
+ td->iolog_buf = NULL;
}
/*
- * Open a stored log and read in the entries.
+ * Read version 2 iolog data. It is enhanced to include per-file logging,
+ * syncs, etc.
*/
-static int init_iolog_read(struct thread_data *td)
+static int read_iolog2(struct thread_data *td, FILE *f)
{
unsigned long long offset;
unsigned int bytes;
+ int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
+ char *fname, *act;
char *str, *p;
- FILE *f;
- int rw, reads, writes;
+ enum fio_ddir rw;
- f = fopen(td->o.read_iolog_file, "r");
- if (!f) {
- perror("fopen read iolog");
- return 1;
+ free_release_files(td);
+
+ /*
+ * Read in the read iolog and store it, reuse the infrastructure
+ * for doing verifications.
+ */
+ str = malloc(4096);
+ fname = malloc(256+16);
+ act = malloc(256+16);
+
+ reads = writes = 0;
+ while ((p = fgets(str, 4096, f)) != NULL) {
+ struct io_piece *ipo;
+ int r;
+
+ r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
+ if (r == 4) {
+ /*
+ * Check action first
+ */
+ if (!strcmp(act, "read"))
+ rw = DDIR_READ;
+ else if (!strcmp(act, "write"))
+ rw = DDIR_WRITE;
+ else if (!strcmp(act, "sync"))
+ rw = DDIR_SYNC;
+ else {
+ log_err("fio: bad iolog file action: %s\n",act);
+ continue;
+ }
+ } else if (r == 2) {
+ rw = DDIR_INVAL;
+ if (!strcmp(act, "add")) {
+ td->o.nr_files++;
+ fileno = add_file(td, fname);
+ file_action = FIO_LOG_ADD_FILE;
+ continue;
+ } else if (!strcmp(act, "open")) {
+ fileno = get_fileno(td, fname);
+ file_action = FIO_LOG_OPEN_FILE;
+ } else if (!strcmp(act, "close")) {
+ fileno = get_fileno(td, fname);
+ file_action = FIO_LOG_CLOSE_FILE;
+ } else {
+ log_err("fio: bad iolog file action: %s\n",act);
+ continue;
+ }
+ } else {
+ log_err("bad iolog2: %s", p);
+ continue;
+ }
+
+ if (rw == DDIR_READ)
+ reads++;
+ else if (rw == DDIR_WRITE) {
+ writes++;
+ /*
+ * Don't add a write for ro mode
+ */
+ if (read_only)
+ continue;
+ } else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
+ log_err("bad ddir: %d\n", rw);
+ continue;
+ }
+
+ /*
+ * Make note of file
+ */
+ ipo = malloc(sizeof(*ipo));
+ memset(ipo, 0, sizeof(*ipo));
+ INIT_LIST_HEAD(&ipo->list);
+ ipo->offset = offset;
+ ipo->len = bytes;
+ ipo->ddir = rw;
+ if (bytes > td->o.max_bs[rw])
+ td->o.max_bs[rw] = bytes;
+ if (rw == DDIR_INVAL) {
+ ipo->fileno = fileno;
+ ipo->file_action = file_action;
+ }
+ list_add_tail(&ipo->list, &td->io_log_list);
+ td->total_io_size += bytes;
}
+ free(str);
+ free(act);
+ free(fname);
+
+ if (writes && read_only) {
+ log_err("fio: <%s> skips replay of %d writes due to read-only\n", td->o.name, writes);
+ writes = 0;
+ }
+
+ if (!reads && !writes)
+ return 1;
+ else if (reads && !writes)
+ td->o.td_ddir = TD_DDIR_READ;
+ else if (!reads && writes)
+ td->o.td_ddir = TD_DDIR_WRITE;
+ else
+ td->o.td_ddir = TD_DDIR_RW;
+
+ return 0;
+}
+
+/*
+ * Read version 1 iolog data.
+ */
+static int read_iolog(struct thread_data *td, FILE *f)
+{
+ unsigned long long offset;
+ unsigned int bytes;
+ char *str, *p;
+ int reads, writes;
+ int rw;
+
/*
* Read in the read iolog and store it, reuse the infrastructure
* for doing verifications.
}
if (rw == DDIR_READ)
reads++;
- else if (rw == DDIR_WRITE)
+ else if (rw == DDIR_WRITE) {
writes++;
- else if (rw != DDIR_SYNC) {
+ /*
+ * Don't add a write for ro mode
+ */
+ if (read_only)
+ continue;
+ } else if (rw != DDIR_SYNC) {
log_err("bad ddir: %d\n", rw);
continue;
}
ipo = malloc(sizeof(*ipo));
+ memset(ipo, 0, sizeof(*ipo));
INIT_LIST_HEAD(&ipo->list);
ipo->offset = offset;
ipo->len = bytes;
if (bytes > td->o.max_bs[rw])
td->o.max_bs[rw] = bytes;
list_add_tail(&ipo->list, &td->io_log_list);
+ td->total_io_size += bytes;
}
free(str);
- fclose(f);
+
+ if (writes && read_only) {
+ log_err("fio: <%s> skips replay of %d writes due to read-only\n", td->o.name, writes);
+ writes = 0;
+ }
if (!reads && !writes)
return 1;
else if (reads && !writes)
td->o.td_ddir = TD_DDIR_READ;
else if (!reads && writes)
- td->o.td_ddir = TD_DDIR_READ;
+ td->o.td_ddir = TD_DDIR_WRITE;
else
td->o.td_ddir = TD_DDIR_RW;
return 0;
}
+/*
+ * open iolog, check version, and call appropriate parser
+ */
+static int init_iolog_read(struct thread_data *td)
+{
+ char buffer[256], *p;
+ FILE *f;
+ int ret;
+
+ f = fopen(td->o.read_iolog_file, "r");
+ if (!f) {
+ perror("fopen read iolog");
+ return 1;
+ }
+
+ p = fgets(buffer, sizeof(buffer), f);
+ if (!p) {
+ td_verror(td, errno, "iolog read");
+ log_err("fio: unable to read iolog\n");
+ return 1;
+ }
+
+ /*
+ * version 2 of the iolog stores a specific string as the
+ * first line, check for that
+ */
+ if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
+ ret = read_iolog2(td, f);
+ else {
+ /*
+ * seek back to the beginning
+ */
+ if (fseek(f, 0, SEEK_SET) < 0) {
+ td_verror(td, errno, "iolog read");
+ log_err("fio: unable to read iolog\n");
+ return 1;
+ }
+
+ ret = read_iolog(td, f);
+ }
+
+ fclose(f);
+ return ret;
+}
+
/*
* Setup a log for storing io patterns.
*/
static int init_iolog_write(struct thread_data *td)
{
+ struct fio_file *ff;
FILE *f;
+ unsigned int i;
f = fopen(td->o.write_iolog_file, "w+");
if (!f) {
td->iolog_f = f;
td->iolog_buf = malloc(8192);
setvbuf(f, td->iolog_buf, _IOFBF, 8192);
+
+ /*
+ * write our version line
+ */
+ if (fprintf(f, "%s\n", iolog_ver2) < 0) {
+ perror("iolog init\n");
+ return 1;
+ }
+
+ /*
+ * add all known files
+ */
+ for_each_file(td, ff, i)
+ log_file(td, ff, FIO_LOG_ADD_FILE);
+
return 0;
}
if (td->io_ops->flags & FIO_DISKLESSIO)
return 0;
- if (td->o.read_iolog_file)
- ret = init_iolog_read(td);
- else if (td->o.write_iolog_file)
+ if (td->o.read_iolog_file) {
+ /*
+ * Check if it's a blktrace file and load that if possible.
+ * Otherwise assume it's a normal log file and load that.
+ */
+ if (is_blktrace(td->o.read_iolog_file))
+ ret = load_blktrace(td, td->o.read_iolog_file);
+ else
+ ret = init_iolog_read(td);
+ } else if (td->o.write_iolog_file)
ret = init_iolog_write(td);
return ret;
projects / fio.git / blobdiff