From 9731bc9855dc169f27433fef3c4d0ff3496c512d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 7 Jul 2022 14:20:54 -0600 Subject: io_uring: impose max limit on apoll cache Caches like this tend to grow to the peak size, and then never get any smaller. Impose a max limit on the size, to prevent it from growing too big. A somewhat randomly chosen 512 is the max size we'll allow the cache to get. If a batch of frees come in and would bring it over that, we simply start kfree'ing the surplus. Signed-off-by: Jens Axboe --- io_uring/io_uring.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'io_uring/io_uring.c') diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index a360a3d390c6..c9c23e459766 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1181,7 +1181,8 @@ void io_free_batch_list(struct io_ring_ctx *ctx, struct io_wq_work_node *node) if (apoll->double_poll) kfree(apoll->double_poll); - io_alloc_cache_put(&ctx->apoll_cache, &apoll->cache); + if (!io_alloc_cache_put(&ctx->apoll_cache, &apoll->cache)) + kfree(apoll); req->flags &= ~REQ_F_POLLED; } if (req->flags & IO_REQ_LINK_FLAGS) -- cgit v1.2.3