Re: [PATCH 2/2] io_uring: Split io_issue_def struct
From: Gabriel Krisman Bertazi
Date: Thu Jan 12 2023 - 15:55:51 EST
Breno Leitao <leitao@xxxxxxxxxx> writes:
> This patch removes some "cold" fields from `struct io_issue_def`.
>
> The plan is to keep only highly used fields into `struct io_issue_def`, so,
> it may be hot in the cache. The hot fields are basically all the bitfields
> and the callback functions for .issue and .prep.
>
> The other less frequently used fields are now located in a secondary and
> cold struct, called `io_cold_def`.
>
> This is the size for the structs:
>
> Before: io_issue_def = 56 bytes
> After: io_issue_def = 24 bytes; io_cold_def = 40 bytes
Does this change have an observable impact in run time? Did it show
a significant decrease of dcache misses?
>
> Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
> ---
> io_uring/io_uring.c | 15 +-
> io_uring/opdef.c | 327 ++++++++++++++++++++++++++++++--------------
> io_uring/opdef.h | 9 +-
> io_uring/rw.c | 2 +-
> 4 files changed, 238 insertions(+), 115 deletions(-)
>
> diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
> index ac7868ec9be2..0be66b026a7f 100644
> --- a/io_uring/io_uring.c
> +++ b/io_uring/io_uring.c
> @@ -980,7 +980,7 @@ void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
> void io_req_defer_failed(struct io_kiocb *req, s32 res)
> __must_hold(&ctx->uring_lock)
> {
> - const struct io_issue_def *def = &io_issue_defs[req->opcode];
> + const struct io_cold_def *def = &io_cold_defs[req->opcode];
>
> lockdep_assert_held(&req->ctx->uring_lock);
>
> @@ -1708,8 +1708,8 @@ unsigned int io_file_get_flags(struct file *file)
>
> bool io_alloc_async_data(struct io_kiocb *req)
> {
> - WARN_ON_ONCE(!io_issue_defs[req->opcode].async_size);
> - req->async_data = kmalloc(io_issue_defs[req->opcode].async_size, GFP_KERNEL);
> + WARN_ON_ONCE(!io_cold_defs[req->opcode].async_size);
> + req->async_data = kmalloc(io_cold_defs[req->opcode].async_size, GFP_KERNEL);
> if (req->async_data) {
> req->flags |= REQ_F_ASYNC_DATA;
> return false;
> @@ -1719,20 +1719,21 @@ bool io_alloc_async_data(struct io_kiocb *req)
>
> int io_req_prep_async(struct io_kiocb *req)
> {
> + const struct io_cold_def *cdef = &io_cold_defs[req->opcode];
> const struct io_issue_def *def = &io_issue_defs[req->opcode];
>
> /* assign early for deferred execution for non-fixed file */
> if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE))
> req->file = io_file_get_normal(req, req->cqe.fd);
> - if (!def->prep_async)
> + if (!cdef->prep_async)
> return 0;
> if (WARN_ON_ONCE(req_has_async_data(req)))
> return -EFAULT;
> - if (!io_issue_defs[req->opcode].manual_alloc) {
> + if (!def->manual_alloc) {
> if (io_alloc_async_data(req))
> return -EAGAIN;
> }
> - return def->prep_async(req);
> + return cdef->prep_async(req);
> }
>
> static u32 io_get_sequence(struct io_kiocb *req)
> @@ -1801,7 +1802,7 @@ static void io_clean_op(struct io_kiocb *req)
> }
>
> if (req->flags & REQ_F_NEED_CLEANUP) {
> - const struct io_issue_def *def = &io_issue_defs[req->opcode];
> + const struct io_cold_def *def = &io_cold_defs[req->opcode];
>
> if (def->cleanup)
> def->cleanup(req);
> diff --git a/io_uring/opdef.c b/io_uring/opdef.c
> index 3c95e70a625e..5238ecd7af6a 100644
> --- a/io_uring/opdef.c
> +++ b/io_uring/opdef.c
> @@ -50,7 +50,6 @@ const struct io_issue_def io_issue_defs[] = {
> [IORING_OP_NOP] = {
> .audit_skip = 1,
> .iopoll = 1,
> - .name = "NOP",
> .prep = io_nop_prep,
> .issue = io_nop,
> },
> @@ -64,13 +63,8 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "READV",
> .prep = io_prep_rw,
> .issue = io_read,
> - .prep_async = io_readv_prep_async,
> - .cleanup = io_readv_writev_cleanup,
> - .fail = io_rw_fail,
> },
> [IORING_OP_WRITEV] = {
> .needs_file = 1,
> @@ -82,18 +76,12 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "WRITEV",
> .prep = io_prep_rw,
> .issue = io_write,
> - .prep_async = io_writev_prep_async,
> - .cleanup = io_readv_writev_cleanup,
> - .fail = io_rw_fail,
> },
> [IORING_OP_FSYNC] = {
> .needs_file = 1,
> .audit_skip = 1,
> - .name = "FSYNC",
> .prep = io_fsync_prep,
> .issue = io_fsync,
> },
> @@ -106,11 +94,8 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "READ_FIXED",
> .prep = io_prep_rw,
> .issue = io_read,
> - .fail = io_rw_fail,
> },
> [IORING_OP_WRITE_FIXED] = {
> .needs_file = 1,
> @@ -122,30 +107,24 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "WRITE_FIXED",
> .prep = io_prep_rw,
> .issue = io_write,
> - .fail = io_rw_fail,
> },
> [IORING_OP_POLL_ADD] = {
> .needs_file = 1,
> .unbound_nonreg_file = 1,
> .audit_skip = 1,
> - .name = "POLL_ADD",
> .prep = io_poll_add_prep,
> .issue = io_poll_add,
> },
> [IORING_OP_POLL_REMOVE] = {
> .audit_skip = 1,
> - .name = "POLL_REMOVE",
> .prep = io_poll_remove_prep,
> .issue = io_poll_remove,
> },
> [IORING_OP_SYNC_FILE_RANGE] = {
> .needs_file = 1,
> .audit_skip = 1,
> - .name = "SYNC_FILE_RANGE",
> .prep = io_sfr_prep,
> .issue = io_sync_file_range,
> },
> @@ -155,14 +134,9 @@ const struct io_issue_def io_issue_defs[] = {
> .pollout = 1,
> .ioprio = 1,
> .manual_alloc = 1,
> - .name = "SENDMSG",
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_msghdr),
> .prep = io_sendmsg_prep,
> .issue = io_sendmsg,
> - .prep_async = io_sendmsg_prep_async,
> - .cleanup = io_sendmsg_recvmsg_cleanup,
> - .fail = io_sendrecv_fail,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> @@ -174,29 +148,21 @@ const struct io_issue_def io_issue_defs[] = {
> .buffer_select = 1,
> .ioprio = 1,
> .manual_alloc = 1,
> - .name = "RECVMSG",
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_msghdr),
> .prep = io_recvmsg_prep,
> .issue = io_recvmsg,
> - .prep_async = io_recvmsg_prep_async,
> - .cleanup = io_sendmsg_recvmsg_cleanup,
> - .fail = io_sendrecv_fail,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> },
> [IORING_OP_TIMEOUT] = {
> .audit_skip = 1,
> - .async_size = sizeof(struct io_timeout_data),
> - .name = "TIMEOUT",
> .prep = io_timeout_prep,
> .issue = io_timeout,
> },
> [IORING_OP_TIMEOUT_REMOVE] = {
> /* used by timeout updates' prep() */
> .audit_skip = 1,
> - .name = "TIMEOUT_REMOVE",
> .prep = io_timeout_remove_prep,
> .issue = io_timeout_remove,
> },
> @@ -206,7 +172,6 @@ const struct io_issue_def io_issue_defs[] = {
> .pollin = 1,
> .poll_exclusive = 1,
> .ioprio = 1, /* used for flags */
> - .name = "ACCEPT",
> #if defined(CONFIG_NET)
> .prep = io_accept_prep,
> .issue = io_accept,
> @@ -216,14 +181,11 @@ const struct io_issue_def io_issue_defs[] = {
> },
> [IORING_OP_ASYNC_CANCEL] = {
> .audit_skip = 1,
> - .name = "ASYNC_CANCEL",
> .prep = io_async_cancel_prep,
> .issue = io_async_cancel,
> },
> [IORING_OP_LINK_TIMEOUT] = {
> .audit_skip = 1,
> - .async_size = sizeof(struct io_timeout_data),
> - .name = "LINK_TIMEOUT",
> .prep = io_link_timeout_prep,
> .issue = io_no_issue,
> },
> @@ -231,46 +193,36 @@ const struct io_issue_def io_issue_defs[] = {
> .needs_file = 1,
> .unbound_nonreg_file = 1,
> .pollout = 1,
> - .name = "CONNECT",
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_connect),
> .prep = io_connect_prep,
> .issue = io_connect,
> - .prep_async = io_connect_prep_async,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> },
> [IORING_OP_FALLOCATE] = {
> .needs_file = 1,
> - .name = "FALLOCATE",
> .prep = io_fallocate_prep,
> .issue = io_fallocate,
> },
> [IORING_OP_OPENAT] = {
> - .name = "OPENAT",
> .prep = io_openat_prep,
> .issue = io_openat,
> - .cleanup = io_open_cleanup,
> },
> [IORING_OP_CLOSE] = {
> - .name = "CLOSE",
> .prep = io_close_prep,
> .issue = io_close,
> },
> [IORING_OP_FILES_UPDATE] = {
> .audit_skip = 1,
> .iopoll = 1,
> - .name = "FILES_UPDATE",
> .prep = io_files_update_prep,
> .issue = io_files_update,
> },
> [IORING_OP_STATX] = {
> .audit_skip = 1,
> - .name = "STATX",
> .prep = io_statx_prep,
> .issue = io_statx,
> - .cleanup = io_statx_cleanup,
> },
> [IORING_OP_READ] = {
> .needs_file = 1,
> @@ -282,11 +234,8 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "READ",
> .prep = io_prep_rw,
> .issue = io_read,
> - .fail = io_rw_fail,
> },
> [IORING_OP_WRITE] = {
> .needs_file = 1,
> @@ -298,21 +247,16 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = sizeof(struct io_async_rw),
> - .name = "WRITE",
> .prep = io_prep_rw,
> .issue = io_write,
> - .fail = io_rw_fail,
> },
> [IORING_OP_FADVISE] = {
> .needs_file = 1,
> .audit_skip = 1,
> - .name = "FADVISE",
> .prep = io_fadvise_prep,
> .issue = io_fadvise,
> },
> [IORING_OP_MADVISE] = {
> - .name = "MADVISE",
> .prep = io_madvise_prep,
> .issue = io_madvise,
> },
> @@ -323,13 +267,9 @@ const struct io_issue_def io_issue_defs[] = {
> .audit_skip = 1,
> .ioprio = 1,
> .manual_alloc = 1,
> - .name = "SEND",
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_msghdr),
> .prep = io_sendmsg_prep,
> .issue = io_send,
> - .fail = io_sendrecv_fail,
> - .prep_async = io_send_prep_async,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> @@ -341,25 +281,20 @@ const struct io_issue_def io_issue_defs[] = {
> .buffer_select = 1,
> .audit_skip = 1,
> .ioprio = 1,
> - .name = "RECV",
> #if defined(CONFIG_NET)
> .prep = io_recvmsg_prep,
> .issue = io_recv,
> - .fail = io_sendrecv_fail,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> },
> [IORING_OP_OPENAT2] = {
> - .name = "OPENAT2",
> .prep = io_openat2_prep,
> .issue = io_openat2,
> - .cleanup = io_open_cleanup,
> },
> [IORING_OP_EPOLL_CTL] = {
> .unbound_nonreg_file = 1,
> .audit_skip = 1,
> - .name = "EPOLL",
> #if defined(CONFIG_EPOLL)
> .prep = io_epoll_ctl_prep,
> .issue = io_epoll_ctl,
> @@ -372,21 +307,18 @@ const struct io_issue_def io_issue_defs[] = {
> .hash_reg_file = 1,
> .unbound_nonreg_file = 1,
> .audit_skip = 1,
> - .name = "SPLICE",
> .prep = io_splice_prep,
> .issue = io_splice,
> },
> [IORING_OP_PROVIDE_BUFFERS] = {
> .audit_skip = 1,
> .iopoll = 1,
> - .name = "PROVIDE_BUFFERS",
> .prep = io_provide_buffers_prep,
> .issue = io_provide_buffers,
> },
> [IORING_OP_REMOVE_BUFFERS] = {
> .audit_skip = 1,
> .iopoll = 1,
> - .name = "REMOVE_BUFFERS",
> .prep = io_remove_buffers_prep,
> .issue = io_remove_buffers,
> },
> @@ -395,13 +327,11 @@ const struct io_issue_def io_issue_defs[] = {
> .hash_reg_file = 1,
> .unbound_nonreg_file = 1,
> .audit_skip = 1,
> - .name = "TEE",
> .prep = io_tee_prep,
> .issue = io_tee,
> },
> [IORING_OP_SHUTDOWN] = {
> .needs_file = 1,
> - .name = "SHUTDOWN",
> #if defined(CONFIG_NET)
> .prep = io_shutdown_prep,
> .issue = io_shutdown,
> @@ -410,72 +340,51 @@ const struct io_issue_def io_issue_defs[] = {
> #endif
> },
> [IORING_OP_RENAMEAT] = {
> - .name = "RENAMEAT",
> .prep = io_renameat_prep,
> .issue = io_renameat,
> - .cleanup = io_renameat_cleanup,
> },
> [IORING_OP_UNLINKAT] = {
> - .name = "UNLINKAT",
> .prep = io_unlinkat_prep,
> .issue = io_unlinkat,
> - .cleanup = io_unlinkat_cleanup,
> },
> [IORING_OP_MKDIRAT] = {
> - .name = "MKDIRAT",
> .prep = io_mkdirat_prep,
> .issue = io_mkdirat,
> - .cleanup = io_mkdirat_cleanup,
> },
> [IORING_OP_SYMLINKAT] = {
> - .name = "SYMLINKAT",
> .prep = io_symlinkat_prep,
> .issue = io_symlinkat,
> - .cleanup = io_link_cleanup,
> },
> [IORING_OP_LINKAT] = {
> - .name = "LINKAT",
> .prep = io_linkat_prep,
> .issue = io_linkat,
> - .cleanup = io_link_cleanup,
> },
> [IORING_OP_MSG_RING] = {
> .needs_file = 1,
> .iopoll = 1,
> - .name = "MSG_RING",
> .prep = io_msg_ring_prep,
> .issue = io_msg_ring,
> - .cleanup = io_msg_ring_cleanup,
> },
> [IORING_OP_FSETXATTR] = {
> .needs_file = 1,
> - .name = "FSETXATTR",
> .prep = io_fsetxattr_prep,
> .issue = io_fsetxattr,
> - .cleanup = io_xattr_cleanup,
> },
> [IORING_OP_SETXATTR] = {
> - .name = "SETXATTR",
> .prep = io_setxattr_prep,
> .issue = io_setxattr,
> - .cleanup = io_xattr_cleanup,
> },
> [IORING_OP_FGETXATTR] = {
> .needs_file = 1,
> - .name = "FGETXATTR",
> .prep = io_fgetxattr_prep,
> .issue = io_fgetxattr,
> - .cleanup = io_xattr_cleanup,
> },
> [IORING_OP_GETXATTR] = {
> - .name = "GETXATTR",
> .prep = io_getxattr_prep,
> .issue = io_getxattr,
> - .cleanup = io_xattr_cleanup,
> },
> [IORING_OP_SOCKET] = {
> .audit_skip = 1,
> - .name = "SOCKET",
> #if defined(CONFIG_NET)
> .prep = io_socket_prep,
> .issue = io_socket,
> @@ -486,16 +395,12 @@ const struct io_issue_def io_issue_defs[] = {
> [IORING_OP_URING_CMD] = {
> .needs_file = 1,
> .plug = 1,
> - .name = "URING_CMD",
> .iopoll = 1,
> .iopoll_queue = 1,
> - .async_size = uring_cmd_pdu_size(1),
> .prep = io_uring_cmd_prep,
> .issue = io_uring_cmd,
> - .prep_async = io_uring_cmd_prep_async,
> },
> [IORING_OP_SEND_ZC] = {
> - .name = "SEND_ZC",
> .needs_file = 1,
> .unbound_nonreg_file = 1,
> .pollout = 1,
> @@ -503,32 +408,243 @@ const struct io_issue_def io_issue_defs[] = {
> .ioprio = 1,
> .manual_alloc = 1,
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_msghdr),
> .prep = io_send_zc_prep,
> .issue = io_send_zc,
> - .prep_async = io_send_prep_async,
> - .cleanup = io_send_zc_cleanup,
> - .fail = io_sendrecv_fail,
> #else
> .prep = io_eopnotsupp_prep,
> #endif
> },
> [IORING_OP_SENDMSG_ZC] = {
> - .name = "SENDMSG_ZC",
> .needs_file = 1,
> .unbound_nonreg_file = 1,
> .pollout = 1,
> .ioprio = 1,
> .manual_alloc = 1,
> #if defined(CONFIG_NET)
> - .async_size = sizeof(struct io_async_msghdr),
> .prep = io_send_zc_prep,
> .issue = io_sendmsg_zc,
> +#else
> + .prep = io_eopnotsupp_prep,
> +#endif
> + },
> +};
> +
> +
> +const struct io_cold_def io_cold_defs[] = {
> + [IORING_OP_NOP] = {
> + .name = "NOP",
> + },
> + [IORING_OP_READV] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "READV",
> + .prep_async = io_readv_prep_async,
> + .cleanup = io_readv_writev_cleanup,
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_WRITEV] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "WRITEV",
> + .prep_async = io_writev_prep_async,
> + .cleanup = io_readv_writev_cleanup,
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_FSYNC] = {
> + .name = "FSYNC",
> + },
> + [IORING_OP_READ_FIXED] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "READ_FIXED",
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_WRITE_FIXED] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "WRITE_FIXED",
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_POLL_ADD] = {
> + .name = "POLL_ADD",
> + },
> + [IORING_OP_POLL_REMOVE] = {
> + .name = "POLL_REMOVE",
> + },
> + [IORING_OP_SYNC_FILE_RANGE] = {
> + .name = "SYNC_FILE_RANGE",
> + },
> + [IORING_OP_SENDMSG] = {
> + .name = "SENDMSG",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_msghdr),
> + .prep_async = io_sendmsg_prep_async,
> + .cleanup = io_sendmsg_recvmsg_cleanup,
> + .fail = io_sendrecv_fail,
> +#endif
> + },
> + [IORING_OP_RECVMSG] = {
> + .name = "RECVMSG",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_msghdr),
> + .prep_async = io_recvmsg_prep_async,
> + .cleanup = io_sendmsg_recvmsg_cleanup,
> + .fail = io_sendrecv_fail,
> +#endif
> + },
> + [IORING_OP_TIMEOUT] = {
> + .async_size = sizeof(struct io_timeout_data),
> + .name = "TIMEOUT",
> + },
> + [IORING_OP_TIMEOUT_REMOVE] = {
> + .name = "TIMEOUT_REMOVE",
> + },
> + [IORING_OP_ACCEPT] = {
> + .name = "ACCEPT",
> + },
> + [IORING_OP_ASYNC_CANCEL] = {
> + .name = "ASYNC_CANCEL",
> + },
> + [IORING_OP_LINK_TIMEOUT] = {
> + .async_size = sizeof(struct io_timeout_data),
> + .name = "LINK_TIMEOUT",
> + },
> + [IORING_OP_CONNECT] = {
> + .name = "CONNECT",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_connect),
> + .prep_async = io_connect_prep_async,
> +#endif
> + },
> + [IORING_OP_FALLOCATE] = {
> + .name = "FALLOCATE",
> + },
> + [IORING_OP_OPENAT] = {
> + .name = "OPENAT",
> + .cleanup = io_open_cleanup,
> + },
> + [IORING_OP_CLOSE] = {
> + .name = "CLOSE",
> + },
> + [IORING_OP_FILES_UPDATE] = {
> + .name = "FILES_UPDATE",
> + },
> + [IORING_OP_STATX] = {
> + .name = "STATX",
> + .cleanup = io_statx_cleanup,
> + },
> + [IORING_OP_READ] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "READ",
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_WRITE] = {
> + .async_size = sizeof(struct io_async_rw),
> + .name = "WRITE",
> + .fail = io_rw_fail,
> + },
> + [IORING_OP_FADVISE] = {
> + .name = "FADVISE",
> + },
> + [IORING_OP_MADVISE] = {
> + .name = "MADVISE",
> + },
> + [IORING_OP_SEND] = {
> + .name = "SEND",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_msghdr),
> + .fail = io_sendrecv_fail,
> + .prep_async = io_send_prep_async,
> +#endif
> + },
> + [IORING_OP_RECV] = {
> + .name = "RECV",
> +#if defined(CONFIG_NET)
> + .fail = io_sendrecv_fail,
> +#endif
> + },
> + [IORING_OP_OPENAT2] = {
> + .name = "OPENAT2",
> + .cleanup = io_open_cleanup,
> + },
> + [IORING_OP_EPOLL_CTL] = {
> + .name = "EPOLL",
> + },
> + [IORING_OP_SPLICE] = {
> + .name = "SPLICE",
> + },
> + [IORING_OP_PROVIDE_BUFFERS] = {
> + .name = "PROVIDE_BUFFERS",
> + },
> + [IORING_OP_REMOVE_BUFFERS] = {
> + .name = "REMOVE_BUFFERS",
> + },
> + [IORING_OP_TEE] = {
> + .name = "TEE",
> + },
> + [IORING_OP_SHUTDOWN] = {
> + .name = "SHUTDOWN",
> + },
> + [IORING_OP_RENAMEAT] = {
> + .name = "RENAMEAT",
> + .cleanup = io_renameat_cleanup,
> + },
> + [IORING_OP_UNLINKAT] = {
> + .name = "UNLINKAT",
> + .cleanup = io_unlinkat_cleanup,
> + },
> + [IORING_OP_MKDIRAT] = {
> + .name = "MKDIRAT",
> + .cleanup = io_mkdirat_cleanup,
> + },
> + [IORING_OP_SYMLINKAT] = {
> + .name = "SYMLINKAT",
> + .cleanup = io_link_cleanup,
> + },
> + [IORING_OP_LINKAT] = {
> + .name = "LINKAT",
> + .cleanup = io_link_cleanup,
> + },
> + [IORING_OP_MSG_RING] = {
> + .name = "MSG_RING",
> + .cleanup = io_msg_ring_cleanup,
> + },
> + [IORING_OP_FSETXATTR] = {
> + .name = "FSETXATTR",
> + .cleanup = io_xattr_cleanup,
> + },
> + [IORING_OP_SETXATTR] = {
> + .name = "SETXATTR",
> + .cleanup = io_xattr_cleanup,
> + },
> + [IORING_OP_FGETXATTR] = {
> + .name = "FGETXATTR",
> + .cleanup = io_xattr_cleanup,
> + },
> + [IORING_OP_GETXATTR] = {
> + .name = "GETXATTR",
> + .cleanup = io_xattr_cleanup,
> + },
> + [IORING_OP_SOCKET] = {
> + .name = "SOCKET",
> + },
> + [IORING_OP_URING_CMD] = {
> + .name = "URING_CMD",
> + .async_size = uring_cmd_pdu_size(1),
> + .prep_async = io_uring_cmd_prep_async,
> + },
> + [IORING_OP_SEND_ZC] = {
> + .name = "SEND_ZC",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_msghdr),
> + .prep_async = io_send_prep_async,
> + .cleanup = io_send_zc_cleanup,
> + .fail = io_sendrecv_fail,
> +#endif
> + },
> + [IORING_OP_SENDMSG_ZC] = {
> + .name = "SENDMSG_ZC",
> +#if defined(CONFIG_NET)
> + .async_size = sizeof(struct io_async_msghdr),
> .prep_async = io_sendmsg_prep_async,
> .cleanup = io_send_zc_cleanup,
> .fail = io_sendrecv_fail,
> -#else
> - .prep = io_eopnotsupp_prep,
> #endif
> },
> };
> @@ -536,7 +652,7 @@ const struct io_issue_def io_issue_defs[] = {
> const char *io_uring_get_opcode(u8 opcode)
> {
> if (opcode < IORING_OP_LAST)
> - return io_issue_defs[opcode].name;
> + return io_cold_defs[opcode].name;
> return "INVALID";
> }
>
> @@ -544,12 +660,13 @@ void __init io_uring_optable_init(void)
> {
> int i;
>
> + BUILD_BUG_ON(ARRAY_SIZE(io_cold_defs) != IORING_OP_LAST);
> BUILD_BUG_ON(ARRAY_SIZE(io_issue_defs) != IORING_OP_LAST);
>
> for (i = 0; i < ARRAY_SIZE(io_issue_defs); i++) {
> BUG_ON(!io_issue_defs[i].prep);
> if (io_issue_defs[i].prep != io_eopnotsupp_prep)
> BUG_ON(!io_issue_defs[i].issue);
> - WARN_ON_ONCE(!io_issue_defs[i].name);
> + WARN_ON_ONCE(!io_cold_defs[i].name);
> }
> }
> diff --git a/io_uring/opdef.h b/io_uring/opdef.h
> index d718e2ab1ff7..c22c8696e749 100644
> --- a/io_uring/opdef.h
> +++ b/io_uring/opdef.h
> @@ -29,19 +29,24 @@ struct io_issue_def {
> unsigned iopoll_queue : 1;
> /* opcode specific path will handle ->async_data allocation if needed */
> unsigned manual_alloc : 1;
> +
> + int (*issue)(struct io_kiocb *, unsigned int);
> + int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
> +};
> +
> +struct io_cold_def {
> /* size of async data needed, if any */
> unsigned short async_size;
>
> const char *name;
>
> - int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
> - int (*issue)(struct io_kiocb *, unsigned int);
> int (*prep_async)(struct io_kiocb *);
> void (*cleanup)(struct io_kiocb *);
> void (*fail)(struct io_kiocb *);
> };
>
> extern const struct io_issue_def io_issue_defs[];
> +extern const struct io_cold_def io_cold_defs[];
>
> void io_uring_optable_init(void);
> #endif
> diff --git a/io_uring/rw.c b/io_uring/rw.c
> index 54b44b9b736c..a8a2eb7ee27a 100644
> --- a/io_uring/rw.c
> +++ b/io_uring/rw.c
> @@ -516,7 +516,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
> static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
> struct io_rw_state *s, bool force)
> {
> - if (!force && !io_issue_defs[req->opcode].prep_async)
> + if (!force && !io_cold_defs[req->opcode].prep_async)
> return 0;
> if (!req_has_async_data(req)) {
> struct io_async_rw *iorw;
--
Gabriel Krisman Bertazi