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io_uring: count allocated requests

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Keep track of the number requests a ring currently has allocated (and
not freed), it'll be needed in the next patch.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c8f8308294dc2a1cb8925d984d937d4fc14ab5d4.1746788718.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2025-05-09 12:12:53 +01:00
committed by Jens Axboe
parent b0c8a6401f
commit 63de899cb6
2 changed files with 9 additions and 1 deletions
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1
include/linux/io_uring_types.h
View File

@@ -435,6 +435,7 @@ struct io_ring_ctx {
/* protected by ->completion_lock */
unsigned evfd_last_cq_tail;
unsigned nr_req_allocated;
/*
* Protection for resize vs mmap races - both the mmap and resize

9
io_uring/io_uring.c
View File

@@ -957,6 +957,8 @@ __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx)
}
percpu_ref_get_many(&ctx->refs, ret);
ctx->nr_req_allocated += ret;
while (ret--) {
struct io_kiocb *req = reqs[ret];
@@ -2694,8 +2696,10 @@ static void io_req_caches_free(struct io_ring_ctx *ctx)
kmem_cache_free(req_cachep, req);
nr++;
}
if (nr)
if (nr) {
ctx->nr_req_allocated -= nr;
percpu_ref_put_many(&ctx->refs, nr);
}
mutex_unlock(&ctx->uring_lock);
}
@@ -2732,6 +2736,9 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
percpu_ref_exit(&ctx->refs);
free_uid(ctx->user);
io_req_caches_free(ctx);
WARN_ON_ONCE(ctx->nr_req_allocated);
if (ctx->hash_map)
io_wq_put_hash(ctx->hash_map);
io_napi_free(ctx);