From 4ce8ad95f0afe927e9a29e7ad491274ebe3a8a7b Mon Sep 17 00:00:00 2001 From: Olivier Langlois Date: Wed, 23 Jun 2021 11:50:18 -0700 Subject: 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 Reviewed-by: Pavel Begunkov Link: https://lore.kernel.org/r/b401640063e77ad3e9f921e09c9b3ac10a8bb923.1624473200.git.olivier@trillion01.com Signed-off-by: Jens Axboe --- fs/io_uring.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'fs/io_uring.c') 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; -- cgit v1.2.3