[PATCH] io_uring/poll: shrink alloc cache size to 32

[Jens Axboe <axboe@xxxxxxxxx>]

This should be plenty, rather than the default of 128, and matches what
we have on the rsrc and futex side as well.

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>

---

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index d300362078a5..40a98f6424ab 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -307,7 +307,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	INIT_HLIST_HEAD(&ctx->io_buf_list);
 	ret = io_alloc_cache_init(&ctx->rsrc_node_cache, IO_NODE_ALLOC_CACHE_MAX,
 			    sizeof(struct io_rsrc_node));
-	ret |= io_alloc_cache_init(&ctx->apoll_cache, IO_ALLOC_CACHE_MAX,
+	ret |= io_alloc_cache_init(&ctx->apoll_cache, IO_POLL_ALLOC_CACHE_MAX,
 			    sizeof(struct async_poll));
 	ret |= io_alloc_cache_init(&ctx->netmsg_cache, IO_ALLOC_CACHE_MAX,
 			    sizeof(struct io_async_msghdr));
diff --git a/io_uring/poll.h b/io_uring/poll.h
index 5c240f11069a..b0e3745f5a29 100644
--- a/io_uring/poll.h
+++ b/io_uring/poll.h
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
+#define IO_POLL_ALLOC_CACHE_MAX 32
+
 enum {
 	IO_APOLL_OK,
 	IO_APOLL_ABORTED,
-- 
Jens Axboe