unsigned sq_entries;
unsigned sq_thread_idle;
unsigned cached_sq_dropped;
- unsigned cached_cq_overflow;
unsigned long sq_check_overflow;
struct list_head defer_list;
return NULL;
}
+static void io_account_cq_overflow(struct io_ring_ctx *ctx)
+{
+ struct io_rings *r = ctx->rings;
+
+ WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1);
+ ctx->cq_extra--;
+}
+
static bool req_need_defer(struct io_kiocb *req, u32 seq)
{
if (unlikely(req->flags & REQ_F_IO_DRAIN)) {
struct io_ring_ctx *ctx = req->ctx;
- return seq + ctx->cq_extra != ctx->cached_cq_tail
- + READ_ONCE(ctx->cached_cq_overflow);
+ return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail;
}
return false;
if (cqe)
memcpy(cqe, &ocqe->cqe, sizeof(*cqe));
else
- WRITE_ONCE(ctx->rings->cq_overflow,
- ++ctx->cached_cq_overflow);
+ io_account_cq_overflow(ctx);
+
posted = true;
list_del(&ocqe->list);
kfree(ocqe);
* or cannot allocate an overflow entry, then we need to drop it
* on the floor.
*/
- WRITE_ONCE(ctx->rings->cq_overflow, ++ctx->cached_cq_overflow);
+ io_account_cq_overflow(ctx);
return false;
}
if (list_empty(&ctx->cq_overflow_list)) {