From: Jens Axboe <[email protected]>
To: [email protected]
Subject: [PATCHSET next 0/5] Add support for non-IPI task_work
Date: Fri, 22 Apr 2022 15:42:09 -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.
--
Jens Axboe
next reply other threads:[~2022-04-22 22:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-22 21:42 Jens Axboe [this message]
2022-04-22 21:42 ` [PATCH 1/5] task_work: allow TWA_SIGNAL without a rescheduling IPI Jens Axboe
2022-04-22 21:42 ` [PATCH 2/5] io_uring: serialize ctx->rings->sq_flags with cmpxchg() Jens Axboe
2022-04-23 8:06 ` Pavel Begunkov
2022-04-23 13:07 ` Jens Axboe
2022-04-23 13:28 ` Jens Axboe
2022-04-22 21:42 ` [PATCH 3/5] io-wq: use __set_notify_signal() to wake workers Jens Axboe
2022-04-22 21:42 ` [PATCH 4/5] io_uring: set task_work notify method at init time Jens Axboe
2022-04-22 21:42 ` [PATCH 5/5] io_uring: use TWA_SIGNAL_NO_IPI if IORING_SETUP_NO_RESCHED is used Jens Axboe
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