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io_uring/napi: add static napi tracking strategy

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Add the static napi tracking strategy. That allows the user to manually
manage the napi ids list for busy polling, and eliminate the overhead of
dynamically updating the list from the fast path.

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/96943de14968c35a5c599352259ad98f3c0770ba.1728828877.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Olivier Langlois
2024-10-13 14:29:24 -04:00
committed by Jens Axboe
parent 71afd926f2
commit 6bf90bd8c5
5 changed files with 160 additions and 27 deletions
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32
include/uapi/linux/io_uring.h
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@@ -790,12 +790,40 @@ struct io_uring_buf_status {
__u32 resv[8];
};
enum io_uring_napi_op {
/* register/ungister backward compatible opcode */
IO_URING_NAPI_REGISTER_OP = 0,
/* opcodes to update napi_list when static tracking is used */
IO_URING_NAPI_STATIC_ADD_ID = 1,
IO_URING_NAPI_STATIC_DEL_ID = 2
};
enum io_uring_napi_tracking_strategy {
/* value must be 0 for backward compatibility */
IO_URING_NAPI_TRACKING_DYNAMIC = 0,
IO_URING_NAPI_TRACKING_STATIC = 1,
IO_URING_NAPI_TRACKING_INACTIVE = 255
};
/* argument for IORING_(UN)REGISTER_NAPI */
struct io_uring_napi {
__u32 busy_poll_to;
__u8 prefer_busy_poll;
__u8 pad[3];
__u64 resv;
/* a io_uring_napi_op value */
__u8 opcode;
__u8 pad[2];
/*
* for IO_URING_NAPI_REGISTER_OP, it is a
* io_uring_napi_tracking_strategy value.
*
* for IO_URING_NAPI_STATIC_ADD_ID/IO_URING_NAPI_STATIC_DEL_ID
* it is the napi id to add/del from napi_list.
*/
__u32 op_param;
__u32 resv;
};
/*