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authorJens Axboe <axboe@kernel.dk>2020-10-15 16:24:45 -0600
committerJens Axboe <axboe@kernel.dk>2020-10-17 09:25:47 -0600
commitd8a6df10aac9f2e4d5f30aff3129d552d2984ce7 (patch)
treec254a63bd2029e29853e1f28568bfc06e4e41b2d /include/linux/io_uring.h
parent500a373d731ac506612db12631ec21295c1ff360 (diff)
downloadlinux-stericsson-d8a6df10aac9f2e4d5f30aff3129d552d2984ce7.tar.gz
io_uring: use percpu counters to track inflight requests
Even though we place the req_issued and req_complete in separate cachelines, there's considerable overhead in doing the atomics particularly on the completion side. Get rid of having the two counters, and just use a percpu_counter for this. That's what it was made for, after all. This considerably reduces the overhead in __io_free_req(). Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/io_uring.h')
-rw-r--r--include/linux/io_uring.h7
1 files changed, 2 insertions, 5 deletions
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 607d14f61132..28939820b6b0 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -23,13 +23,10 @@ struct io_uring_task {
struct xarray xa;
struct wait_queue_head wait;
struct file *last;
- atomic_long_t req_issue;
+ struct percpu_counter inflight;
struct io_identity __identity;
struct io_identity *identity;
-
- /* completion side */
- bool in_idle ____cacheline_aligned_in_smp;
- atomic_long_t req_complete;
+ bool in_idle;
};
#if defined(CONFIG_IO_URING)