From: Jens Axboe Date: Wed, 21 Nov 2018 02:47:01 +0000 (-0700) Subject: engines/libaio: add support for user mapped iocbs X-Git-Tag: fio-3.13~106 X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=3c3168e91329c83880c91e5abc28b9d6b940fd95 engines/libaio: add support for user mapped iocbs For polled IO, we can support having the kernel map our iocbs, instead of having to copy them for each IO submission. Signed-off-by: Jens Axboe --- diff --git a/engines/libaio.c b/engines/libaio.c index 2a4d6534..bae141ca 100644 --- a/engines/libaio.c +++ b/engines/libaio.c @@ -19,6 +19,10 @@ #ifndef IOCTX_FLAG_IOPOLL #define IOCTX_FLAG_IOPOLL (1 << 0) #endif +#ifndef IOCTX_FLAG_USERIOCB +#define IOCTX_FLAG_USERIOCB (1 << 1) +#endif + static int fio_libaio_commit(struct thread_data *td); @@ -28,6 +32,9 @@ struct libaio_data { struct iocb **iocbs; struct io_u **io_us; + struct iocb *user_iocbs; + struct io_u **io_u_index; + /* * Basic ring buffer. 'head' is incremented in _queue(), and * 'tail' is incremented in _commit(). We keep 'queued' so @@ -47,6 +54,7 @@ struct libaio_options { void *pad; unsigned int userspace_reap; unsigned int hipri; + unsigned int useriocb; }; static struct fio_option options[] = { @@ -68,6 +76,15 @@ static struct fio_option options[] = { .category = FIO_OPT_C_ENGINE, .group = FIO_OPT_G_LIBAIO, }, + { + .name = "useriocb", + .lname = "User IOCBs", + .type = FIO_OPT_STR_SET, + .off1 = offsetof(struct libaio_options, useriocb), + .help = "Use user mapped IOCBs", + .category = FIO_OPT_C_ENGINE, + .group = FIO_OPT_G_LIBAIO, + }, { .name = NULL, }, @@ -84,19 +101,26 @@ static inline void ring_inc(struct libaio_data *ld, unsigned int *val, static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) { + struct libaio_data *ld = td->io_ops_data; struct fio_file *f = io_u->file; struct libaio_options *o = td->eo; + struct iocb *iocb; + + if (o->useriocb) + iocb = &ld->user_iocbs[io_u->index]; + else + iocb = &io_u->iocb; if (io_u->ddir == DDIR_READ) { - io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); + io_prep_pread(iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); if (o->hipri) - io_u->iocb.u.c.flags |= IOCB_FLAG_HIPRI; + iocb->u.c.flags |= IOCB_FLAG_HIPRI; } else if (io_u->ddir == DDIR_WRITE) { - io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); + io_prep_pwrite(iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); if (o->hipri) - io_u->iocb.u.c.flags |= IOCB_FLAG_HIPRI; + iocb->u.c.flags |= IOCB_FLAG_HIPRI; } else if (ddir_sync(io_u->ddir)) - io_prep_fsync(&io_u->iocb, f->fd); + io_prep_fsync(iocb, f->fd); return 0; } @@ -104,11 +128,16 @@ static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) static struct io_u *fio_libaio_event(struct thread_data *td, int event) { struct libaio_data *ld = td->io_ops_data; + struct libaio_options *o = td->eo; struct io_event *ev; struct io_u *io_u; ev = ld->aio_events + event; - io_u = container_of(ev->obj, struct io_u, iocb); + if (o->useriocb) { + int index = (int) (uintptr_t) ev->obj; + io_u = ld->io_u_index[index]; + } else + io_u = container_of(ev->obj, struct io_u, iocb); if (ev->res != io_u->xfer_buflen) { if (ev->res > io_u->xfer_buflen) @@ -204,6 +233,7 @@ static enum fio_q_status fio_libaio_queue(struct thread_data *td, struct io_u *io_u) { struct libaio_data *ld = td->io_ops_data; + struct libaio_options *o = td->eo; fio_ro_check(td, io_u); @@ -234,7 +264,11 @@ static enum fio_q_status fio_libaio_queue(struct thread_data *td, return FIO_Q_COMPLETED; } - ld->iocbs[ld->head] = &io_u->iocb; + if (o->useriocb) + ld->iocbs[ld->head] = (struct iocb *) (uintptr_t) io_u->index; + else + ld->iocbs[ld->head] = &io_u->iocb; + ld->io_us[ld->head] = io_u; ring_inc(ld, &ld->head, 1); ld->queued++; @@ -353,25 +387,34 @@ static void fio_libaio_cleanup(struct thread_data *td) free(ld->aio_events); free(ld->iocbs); free(ld->io_us); + if (ld->user_iocbs) + free(ld->user_iocbs); free(ld); } } static int fio_libaio_queue_init(struct libaio_data *ld, unsigned int depth, - bool hipri) + bool hipri, bool useriocb) { #ifdef __NR_sys_io_setup2 int flags = 0; if (hipri) - flags = IOCTX_FLAG_IOPOLL; + flags |= IOCTX_FLAG_IOPOLL; + if (useriocb) + flags |= IOCTX_FLAG_USERIOCB; - return syscall(__NR_sys_io_setup2, depth, flags, &ld->aio_ctx); + return syscall(__NR_sys_io_setup2, depth, flags, ld->user_iocbs, &ld->aio_ctx); #else if (hipri) { log_err("fio: polled aio not available on your platform\n"); return 1; } + if (useriocb) { + log_err("fio: user mapped iocbs not available on your platform\n"); + return 1; + } + return io_queue_init(depth, &ld->aio_ctx); #endif } @@ -384,15 +427,31 @@ static int fio_libaio_init(struct thread_data *td) ld = calloc(1, sizeof(*ld)); + if (o->useriocb) { + size_t size; + void *p; + + ld->io_u_index = calloc(td->o.iodepth, sizeof(struct io_u *)); + size = td->o.iodepth * sizeof(struct iocb); + if (posix_memalign(&p, page_size, size)) { + log_err("fio: libaio iocb allocation failure\n"); + free(ld); + return 1; + } + ld->user_iocbs = p; + } + /* * First try passing in 0 for queue depth, since we don't * care about the user ring. If that fails, the kernel is too old * and we need the right depth. */ - err = fio_libaio_queue_init(ld, td->o.iodepth, o->hipri); + err = fio_libaio_queue_init(ld, td->o.iodepth, o->hipri, o->useriocb); if (err) { td_verror(td, -err, "io_queue_init"); log_err("fio: check /proc/sys/fs/aio-max-nr\n"); + if (ld->user_iocbs) + free(ld->user_iocbs); free(ld); return 1; } @@ -407,10 +466,24 @@ static int fio_libaio_init(struct thread_data *td) return 0; } +static int fio_libaio_io_u_init(struct thread_data *td, struct io_u *io_u) +{ + struct libaio_options *o = td->eo; + + if (o->useriocb) { + struct libaio_data *ld = td->io_ops_data; + + ld->io_u_index[io_u->index] = io_u; + } + + return 0; +} + static struct ioengine_ops ioengine = { .name = "libaio", .version = FIO_IOOPS_VERSION, .init = fio_libaio_init, + .io_u_init = fio_libaio_io_u_init, .prep = fio_libaio_prep, .queue = fio_libaio_queue, .commit = fio_libaio_commit,