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io_uring: move multishot cqe cache in ctx

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We cache multishot CQEs before flushing them to the CQ in
submit_state.cqe. It's a 16 entry cache totalling 256 bytes in the
middle of the io_submit_state structure. Move it out of there, it
should help with CPU caches for the submission state, and shouldn't
affect cached CQEs.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/dbe1f39c043ee23da918836be44fcec252ce6711.1692916914.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-08-24 23:53:36 +01:00 committed by Jens Axboe
parent c9def23dde
commit 0aa7aa5f76
2 changed files with 5 additions and 4 deletions
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3
include/linux/io_uring_types.h
View File

@ -176,7 +176,6 @@ struct io_submit_state {
unsigned short submit_nr;
unsigned int cqes_count;
struct blk_plug plug;
struct io_uring_cqe cqes[16];
};
struct io_ev_fd {
@ -307,6 +306,8 @@ struct io_ring_ctx {
unsigned cq_last_tm_flush;
} ____cacheline_aligned_in_smp;
struct io_uring_cqe completion_cqes[16];
/* IRQ completion list, under ->completion_lock */
struct io_wq_work_list locked_free_list;
unsigned int locked_free_nr;

6
io_uring/io_uring.c
View File

@ -880,7 +880,7 @@ static void __io_flush_post_cqes(struct io_ring_ctx *ctx)
lockdep_assert_held(&ctx->uring_lock);
for (i = 0; i < state->cqes_count; i++) {
struct io_uring_cqe *cqe = &state->cqes[i];
struct io_uring_cqe *cqe = &ctx->completion_cqes[i];
if (!io_fill_cqe_aux(ctx, cqe->user_data, cqe->res, cqe->flags)) {
if (ctx->task_complete) {
@ -931,7 +931,7 @@ bool io_fill_cqe_req_aux(struct io_kiocb *req, bool defer, s32 res, u32 cflags)
lockdep_assert_held(&ctx->uring_lock);
if (ctx->submit_state.cqes_count == ARRAY_SIZE(ctx->submit_state.cqes)) {
if (ctx->submit_state.cqes_count == ARRAY_SIZE(ctx->completion_cqes)) {
__io_cq_lock(ctx);
__io_flush_post_cqes(ctx);
/* no need to flush - flush is deferred */
@ -945,7 +945,7 @@ bool io_fill_cqe_req_aux(struct io_kiocb *req, bool defer, s32 res, u32 cflags)
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
return false;
cqe = &ctx->submit_state.cqes[ctx->submit_state.cqes_count++];
cqe = &ctx->completion_cqes[ctx->submit_state.cqes_count++];
cqe->user_data = user_data;
cqe->res = res;
cqe->flags = cflags;