diff options
| author | Olivier Langlois <olivier@trillion01.com> | 2021-06-23 11:50:18 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-06-23 20:38:21 -0600 |
| commit | 4ce8ad95f0afe927e9a29e7ad491274ebe3a8a7b (patch) | |
| tree | 7257f115ceafc30bb0a20d19a52d399bcf84ef14 /fs/io_uring.c | |
| parent | 997135017716c33f3405e86cca5da9567b40a08e (diff) | |
| download | linux-4ce8ad95f0afe927e9a29e7ad491274ebe3a8a7b.tar.bz2 | |
io_uring: Create define to modify a SQPOLL parameter
The magic number used to cap the number of entries extracted from an
io_uring instance SQ before moving to the other instances is an
interesting parameter to experiment with.
A define has been created to make it easy to change its value from a
single location.
Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b401640063e77ad3e9f921e09c9b3ac10a8bb923.1624473200.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 7c545fa66f31..e7997f9bf879 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -89,6 +89,7 @@ #define IORING_MAX_ENTRIES 32768 #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) +#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 /* * Shift of 9 is 512 entries, or exactly one page on 64-bit archs @@ -6797,8 +6798,8 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) to_submit = io_sqring_entries(ctx); /* if we're handling multiple rings, cap submit size for fairness */ - if (cap_entries && to_submit > 8) - to_submit = 8; + if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) + to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; if (!list_empty(&ctx->iopoll_list) || to_submit) { unsigned nr_events = 0; |