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| author | Pavel Begunkov <asml.silence@gmail.com> | 2023-08-25 01:53:31 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-08-25 02:16:19 +0300 |
| commit | e5598d6ae62626d261b046a2f19347c38681ff51 (patch) | |
| tree | 81aca521dbf7f09de222549933d186a75dfacece /include/linux/io_uring_types.h | |
| parent | 093a650b757210bc856ca7f5349fb5a4bb9d4bd6 (diff) | |
| download | linux-e5598d6ae62626d261b046a2f19347c38681ff51.tar.xz | |
io_uring: compact SQ/CQ heads/tails
Queues heads and tails cache line aligned. That makes sq, cq taking 4
lines or 5 lines if we include the rest of struct io_rings (e.g.
sq_flags is frequently accessed).
Since modern io_uring is mostly single threaded, it doesn't make much
send to spread them as such, it wastes space and puts additional pressure
on caches. Put them all into a single line.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9c8deddf9a7ed32069235a530d1e117fb460bc4c.1692916914.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/io_uring_types.h')
| -rw-r--r-- | include/linux/io_uring_types.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index c0c03d8059df..608a8e80e881 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -69,8 +69,8 @@ struct io_uring_task { }; struct io_uring { - u32 head ____cacheline_aligned_in_smp; - u32 tail ____cacheline_aligned_in_smp; + u32 head; + u32 tail; }; /* |