From: Olivier Langlois <[email protected]>
To: Jens Axboe <[email protected]>,
Pavel Begunkov <[email protected]>,
[email protected], [email protected]
Cc: Olivier Langlois <[email protected]>
Subject: [PATCH 2/2] io_uring: Create define to modify a SQPOLL parameter
Date: Tue, 22 Jun 2021 11:45:31 -0700 [thread overview]
Message-ID: <c05f957a5b5675a0b401e211065e08255014232c.1624387080.git.olivier@trillion01.com> (raw)
In-Reply-To: <[email protected]>
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 <[email protected]>
---
fs/io_uring.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 02f789e07d4c..3f271bd7726b 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;
--
2.32.0
next prev parent reply other threads:[~2021-06-22 18:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 18:45 [PATCH 0/2] Minor SQPOLL thread fix and improvement Olivier Langlois, Olivier Langlois
2021-06-22 18:45 ` [PATCH 1/2] io_uring: Fix race condition when sqp thread goes to sleep Olivier Langlois
2021-06-22 18:53 ` Olivier Langlois
2021-06-22 18:55 ` Pavel Begunkov
2021-06-22 19:07 ` Olivier Langlois
[not found] ` <[email protected]>
2021-06-22 20:45 ` [PATCH 1/2 v2] " Pavel Begunkov
2021-06-22 22:37 ` Olivier Langlois
2021-06-22 22:42 ` Olivier Langlois
2021-06-22 23:03 ` Pavel Begunkov
2021-06-23 13:52 ` Olivier Langlois
2021-06-23 15:58 ` Pavel Begunkov
2021-06-22 18:45 ` Olivier Langlois [this message]
2021-06-22 20:58 ` [PATCH 2/2] io_uring: Create define to modify a SQPOLL parameter Pavel Begunkov
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