From: Jens Axboe <[email protected]>
To: [email protected]
Subject: [PATCHSET v3 next 0/5] Add support for non-IPI task_work
Date: Mon, 25 Apr 2022 08:21:12 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
Hi,
Unless we're using SQPOLL, any task_work queue will result in an IPI
to the target task unless it's running in the kernel already. This isn't
always needed, particularly not for the common case of not sharing the
ring. In certain workloads, this can provide a 5-10% improvement. Some
of this is due the cost of the IPI, and some from needlessly
interrupting the target task when the work could just get run when
completions are being waited for.
Patches 1..4 are prep patches, patch 5 is the actual change, and patch 6
adds support for IORING_SQ_TASKRUN so that applications may use this
feature and still rely on io_uring_peek_cqe().
v3:
- Rename flags to hopefully be more descriptive
- Add flag for managing IORING_SQ_TASKRUN flag
- Rebase on current branch
--
Jens Axboe
next reply other threads:[~2022-04-25 14:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-25 14:21 Jens Axboe [this message]
2022-04-25 14:21 ` [PATCH 1/6] task_work: allow TWA_SIGNAL without a rescheduling IPI Jens Axboe
2022-04-25 14:21 ` [PATCH 2/6] io_uring: serialize ctx->rings->sq_flags with atomic_or/and Jens Axboe
2022-04-25 14:21 ` [PATCH 3/6] io-wq: use __set_notify_signal() to wake workers Jens Axboe
2022-04-25 14:21 ` [PATCH 4/6] io_uring: set task_work notify method at init time Jens Axboe
2022-04-25 14:21 ` [PATCH 5/6] io_uring: use TWA_SIGNAL_NO_IPI if IORING_SETUP_COOP_TASKRUN is used Jens Axboe
2022-04-25 14:21 ` [PATCH 6/6] io_uring: add IORING_SETUP_TASKRUN_FLAG Jens Axboe
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