/*
- * regular read/write sync io engine
+ * mmap engine
+ *
+ * IO engine that reads/writes from files by doing memcpy to/from
+ * a memory mapped region of the file.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
-#include <assert.h>
#include <sys/mman.h>
#include "../fio.h"
-#include "../os.h"
+#include "../verify.h"
-struct mmapio_data {
- struct io_u *last_io_u;
-};
+/*
+ * Limits us to 2GB of mapped files in total
+ */
+#define MMAP_TOTAL_SZ (2 * 1024 * 1024 * 1024UL)
+
+static unsigned long mmap_map_size;
+static unsigned long mmap_map_mask;
-static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min,
- int max, struct timespec fio_unused *t)
+static int fio_mmap_file(struct thread_data *td, struct fio_file *f,
+ size_t length, off_t off)
{
- assert(max <= 1);
+ int flags = 0;
+ int ret = 0;
+
+ if (td_rw(td))
+ flags = PROT_READ | PROT_WRITE;
+ else if (td_write(td)) {
+ flags = PROT_WRITE;
+
+ if (td->o.verify != VERIFY_NONE)
+ flags |= PROT_READ;
+ } else
+ flags = PROT_READ;
+
+ f->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off);
+ if (f->mmap_ptr == MAP_FAILED) {
+ int err = errno;
+
+ f->mmap_ptr = NULL;
+ td_verror(td, err, "mmap");
+ goto err;
+ }
- /*
- * we can only have one finished io_u for sync io, since the depth
- * is always 1
- */
- if (list_empty(&td->io_u_busylist))
- return 0;
+ if (!td_random(td)) {
+ if (madvise(f->mmap_ptr, length, MADV_SEQUENTIAL) < 0) {
+ td_verror(td, errno, "madvise");
+ goto err;
+ }
+ } else {
+ if (madvise(f->mmap_ptr, length, MADV_RANDOM) < 0) {
+ td_verror(td, errno, "madvise");
+ goto err;
+ }
+ }
- return 1;
+err:
+ return ret;
}
-static struct io_u *fio_mmapio_event(struct thread_data *td, int event)
+static int fio_mmapio_prep(struct thread_data *td, struct io_u *io_u)
{
- struct mmapio_data *sd = td->io_ops->data;
+ struct fio_file *f = io_u->file;
+ int ret = 0;
+
+ if (io_u->buflen > mmap_map_size) {
+ log_err("fio: bs too big for mmap engine\n");
+ ret = EIO;
+ goto err;
+ }
- assert(event == 0);
+ if (io_u->offset >= f->mmap_off &&
+ io_u->offset + io_u->buflen < f->mmap_off + f->mmap_sz)
+ goto done;
- return sd->last_io_u;
-}
+ if (f->mmap_ptr) {
+ if (munmap(f->mmap_ptr, f->mmap_sz) < 0) {
+ ret = errno;
+ goto err;
+ }
+ f->mmap_ptr = NULL;
+ }
+ f->mmap_sz = mmap_map_size;
+ if (f->mmap_sz > f->io_size)
+ f->mmap_sz = f->io_size;
+
+ f->mmap_off = io_u->offset & ~mmap_map_mask;
+ if (io_u->offset + io_u->buflen >= f->mmap_off + f->mmap_sz)
+ f->mmap_off -= io_u->buflen;
+
+ ret = fio_mmap_file(td, f, f->mmap_sz, f->mmap_off);
+done:
+ if (!ret)
+ io_u->mmap_data = f->mmap_ptr + io_u->offset - f->mmap_off -
+ f->file_offset;
+err:
+ return ret;
+}
static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
{
struct fio_file *f = io_u->file;
- unsigned long long real_off = io_u->offset - f->file_offset;
- struct mmapio_data *sd = td->io_ops->data;
+
+ fio_ro_check(td, io_u);
if (io_u->ddir == DDIR_READ)
- memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
+ memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen);
else if (io_u->ddir == DDIR_WRITE)
- memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
- else if (io_u->ddir == DDIR_SYNC) {
- if (msync(f->mmap, f->file_size, MS_SYNC))
+ memcpy(io_u->mmap_data, io_u->xfer_buf, io_u->xfer_buflen);
+ else if (ddir_sync(io_u->ddir)) {
+ if (msync(f->mmap_ptr, f->mmap_sz, MS_SYNC)) {
io_u->error = errno;
+ td_verror(td, io_u->error, "msync");
+ }
}
/*
* not really direct, but should drop the pages from the cache
*/
- if (td->odirect && io_u->ddir != DDIR_SYNC) {
- if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0)
+ if (td->o.odirect && !ddir_sync(io_u->ddir)) {
+ if (msync(io_u->mmap_data, io_u->xfer_buflen, MS_SYNC) < 0) {
io_u->error = errno;
- if (madvise(f->mmap + real_off, io_u->xfer_buflen, MADV_DONTNEED) < 0)
+ td_verror(td, io_u->error, "msync");
+ }
+ if (madvise(io_u->mmap_data, io_u->xfer_buflen, MADV_DONTNEED) < 0) {
io_u->error = errno;
+ td_verror(td, io_u->error, "madvise");
+ }
}
- if (!io_u->error)
- sd->last_io_u = io_u;
- else
- td_verror(td, io_u->error);
-
- return io_u->error;
-}
-
-static void fio_mmapio_cleanup(struct thread_data *td)
-{
- if (td->io_ops->data) {
- free(td->io_ops->data);
- td->io_ops->data = NULL;
- }
+ return FIO_Q_COMPLETED;
}
static int fio_mmapio_init(struct thread_data *td)
{
- struct mmapio_data *sd = malloc(sizeof(*sd));
-
- sd->last_io_u = NULL;
- td->io_ops->data = sd;
+ unsigned long shift, mask;
+
+ mmap_map_size = MMAP_TOTAL_SZ / td->o.nr_files;
+ mask = mmap_map_size;
+ shift = 0;
+ do {
+ mask >>= 1;
+ if (!mask)
+ break;
+ shift++;
+ } while (1);
+
+ mmap_map_mask = 1UL << shift;
return 0;
}
.name = "mmap",
.version = FIO_IOOPS_VERSION,
.init = fio_mmapio_init,
+ .prep = fio_mmapio_prep,
.queue = fio_mmapio_queue,
- .getevents = fio_mmapio_getevents,
- .event = fio_mmapio_event,
- .cleanup = fio_mmapio_cleanup,
- .flags = FIO_SYNCIO | FIO_MMAPIO,
+ .open_file = generic_open_file,
+ .close_file = generic_close_file,
+ .get_file_size = generic_get_file_size,
+ .flags = FIO_SYNCIO | FIO_NOEXTEND,
};
static void fio_init fio_mmapio_register(void)
projects / fio.git / blobdiff