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io_uring: static_key for !IORING_SETUP_NO_SQARRAY

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IORING_SETUP_NO_SQARRAY should be preferred and used by default by
liburing, optimise flag checking in io_get_sqe() with a static key.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c164a48542fbb080115e2377ecf160c758562742.1729264988.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-10-18 17:07:59 +01:00 committed by Jens Axboe
parent 1e6e7602cc
commit 9b296c625a
1 changed files with 11 additions and 1 deletions
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12
io_uring/io_uring.c
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@ -70,6 +70,7 @@
#include <linux/io_uring/cmd.h>
#include <linux/audit.h>
#include <linux/security.h>
#include <linux/jump_label.h>
#include <asm/shmparam.h>
#define CREATE_TRACE_POINTS
@ -149,6 +150,8 @@ static bool io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
static void io_queue_sqe(struct io_kiocb *req);
static __read_mostly DEFINE_STATIC_KEY_FALSE(io_key_has_sqarray);
struct kmem_cache *req_cachep;
static struct workqueue_struct *iou_wq __ro_after_init;
@ -2254,7 +2257,8 @@ static bool io_get_sqe(struct io_ring_ctx *ctx, const struct io_uring_sqe **sqe)
unsigned mask = ctx->sq_entries - 1;
unsigned head = ctx->cached_sq_head++ & mask;
if (!(ctx->flags & IORING_SETUP_NO_SQARRAY)) {
if (static_branch_unlikely(&io_key_has_sqarray) &&
(!(ctx->flags & IORING_SETUP_NO_SQARRAY))) {
head = READ_ONCE(ctx->sq_array[head]);
if (unlikely(head >= ctx->sq_entries)) {
/* drop invalid entries */
@ -2758,6 +2762,9 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
}
io_rings_free(ctx);
if (!(ctx->flags & IORING_SETUP_NO_SQARRAY))
static_branch_dec(&io_key_has_sqarray);
percpu_ref_exit(&ctx->refs);
free_uid(ctx->user);
io_req_caches_free(ctx);
@ -3549,6 +3556,9 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
ctx->clockid = CLOCK_MONOTONIC;
ctx->clock_offset = 0;
if (!(ctx->flags & IORING_SETUP_NO_SQARRAY))
static_branch_inc(&io_key_has_sqarray);
if ((ctx->flags & IORING_SETUP_DEFER_TASKRUN) &&
!(ctx->flags & IORING_SETUP_IOPOLL) &&
!(ctx->flags & IORING_SETUP_SQPOLL))