From: Christoph Hellwig <hch@lst.de>
To: viro@zeniv.linux.org.uk
Cc: Avi Kivity <avi@scylladb.com>,
linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org
Subject: Re: aio poll, io_pgetevents and a new in-kernel poll API
Date: Thu, 4 Jan 2018 10:09:24 +0100 [thread overview]
Message-ID: <20180104090924.GA3674@lst.de> (raw)
In-Reply-To: <20180104080043.14506-1-hch@lst.de>
And of coure I should have added linux-api to the series.
Note that the libaio patches include documenting io_pgetevents in the
io_getevents man page.
On Thu, Jan 04, 2018 at 09:00:12AM +0100, Christoph Hellwig wrote:
> Hi all,
>
> this series adds support for the IOCB_CMD_POLL operation to poll for the
> readyness of file descriptors using the aio subsystem. The API is based
> on patches that existed in RHAS2.1 and RHEL3, which means it already is
> supported by libaio. To implement the poll support efficiently new
> methods to poll are introduced in struct file_operations: get_poll_head
> and poll_mask. The first one returns a wait_queue_head to wait on
> (lifetime is bound by the file), and the second does a non-blocking
> check for the POLL* events. This allows aio poll to work without
> any additional context switches, unlike epoll.
>
> To make the interface fully useful a new io_pgetevents system call is
> added, which atomically saves and restores the signal mask over the
> io_pgetevents system call. It it the logical equivalent to pselect and
> ppoll for io_pgetevents.
>
> The corresponding libaio changes for io_pgetevents support and
> documentation, as well as a test case will be posted in a separate
> series.
>
> The changes were sponsored by Scylladb, and improve performance
> of the seastar framework up to 10%, while also removing the need
> for a privileged SCHED_FIFO epoll listener thread.
>
> The patches are on top of Als __poll_t annoations, so I've also
> prepared a git branch on top of those here:
>
> git://git.infradead.org/users/hch/vfs.git aio-poll
>
> Gitweb:
>
> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll
>
> Libaio changes:
>
> http://git.infradead.org/users/hch/libaio.git/shortlog/refs/heads/aio-poll
>
> Seastar changes:
>
> https://github.com/avikivity/seastar/commits/aio
---end quoted text---
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next prev parent reply other threads:[~2018-01-04 9:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-04 8:00 aio poll, io_pgetevents and a new in-kernel poll API Christoph Hellwig
2018-01-04 8:00 ` [PATCH 01/31] fs: update documentation for __poll_t Christoph Hellwig
2018-01-04 8:00 ` [PATCH 02/31] fs: add new vfs_poll and file_can_poll helpers Christoph Hellwig
2018-01-06 19:08 ` Al Viro
2018-01-08 10:44 ` Christoph Hellwig
2018-01-04 8:00 ` [PATCH 03/31] fs: introduce new ->get_poll_head and ->poll_mask methods Christoph Hellwig
2018-01-06 19:12 ` Al Viro
2018-01-08 10:45 ` Christoph Hellwig
2018-01-10 16:31 ` Al Viro
2018-01-10 17:42 ` Christoph Hellwig
2018-01-04 8:00 ` [PATCH 04/31] net: add support for ->poll_mask in proto_ops Christoph Hellwig
2018-01-06 19:16 ` Al Viro
2018-01-08 10:48 ` Christoph Hellwig
2018-01-09 16:32 ` Christoph Hellwig
2018-01-09 16:41 ` Christoph Hellwig
2018-01-04 8:00 ` [PATCH 05/31] net: remove sock_no_poll Christoph Hellwig
2018-01-04 8:00 ` [PATCH 06/31] net/tcp: convert to ->poll_mask Christoph Hellwig
2018-01-04 8:00 ` [PATCH 07/31] net/unix: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 08/31] net: convert datagram_poll users tp ->poll_mask Christoph Hellwig
2018-01-04 8:00 ` [PATCH 09/31] net/dccp: convert to ->poll_mask Christoph Hellwig
2018-01-04 8:00 ` [PATCH 10/31] net/atm: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 11/31] net/vmw_vsock: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 12/31] net/tipc: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 13/31] net/sctp: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 14/31] net/bluetooth: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 15/31] net/caif: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 16/31] net/nfc: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 17/31] net/phonet: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 18/31] net/iucv: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 19/31] net/rxrpc: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 20/31] pipe: " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 21/31] eventfd: switch " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 22/31] timerfd: convert " Christoph Hellwig
2018-01-04 8:00 ` [PATCH 23/31] aio: don't print the page size at boot time Christoph Hellwig
2018-01-09 17:18 ` Jeff Moyer
2018-01-04 8:00 ` [PATCH 24/31] aio: remove an outdated comment in aio_complete Christoph Hellwig
2018-01-09 17:19 ` Jeff Moyer
2018-01-04 8:00 ` [PATCH 25/31] aio: refactor read/write iocb setup Christoph Hellwig
2018-01-04 8:00 ` [PATCH 26/31] aio: sanitize ki_list handling Christoph Hellwig
2018-01-04 8:00 ` [PATCH 27/31] aio: simplify cancellation Christoph Hellwig
2018-01-04 8:00 ` [PATCH 28/31] aio: delete iocbs from the active_reqs list in kiocb_cancel Christoph Hellwig
2018-01-04 8:00 ` [PATCH 29/31] aio: add delayed cancel support Christoph Hellwig
2018-01-04 8:00 ` [PATCH 30/31] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-01-04 8:00 ` [PATCH 31/31] aio: implement io_pgetevents Christoph Hellwig
2018-01-09 22:16 ` Arnd Bergmann
2018-01-10 8:11 ` Christoph Hellwig
2018-01-10 11:03 ` Arnd Bergmann
2018-01-10 14:59 ` Christoph Hellwig
2018-01-10 15:48 ` Arnd Bergmann
2018-01-10 15:49 ` Christoph Hellwig
2018-01-10 15:56 ` Christoph Hellwig
2018-01-04 9:09 ` Christoph Hellwig [this message]
2018-01-09 12:28 ` aio poll, io_pgetevents and a new in-kernel poll API Christoph Hellwig
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