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-api@vger•kernel.org,
linux-kernel@vger•kernel.org
Subject: Re: aio poll, io_pgetevents and a new in-kernel poll API V5
Date: Tue, 13 Mar 2018 08:46:26 +0100 [thread overview]
Message-ID: <20180313074626.GA32614@lst.de> (raw)
In-Reply-To: <20180305212743.16664-1-hch@lst.de>
ping?
On Mon, Mar 05, 2018 at 01:27:07PM -0800, 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.
>
> git://git.infradead.org/users/hch/vfs.git aio-poll.5
>
> Gitweb:
>
> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll.5
>
> Libaio changes:
>
> https://pagure.io/libaio.git io-poll
>
> Seastar changes (not updated for the new io_pgetevens ABI yet):
>
> https://github.com/avikivity/seastar/commits/aio
>
> Changes since V4:
> - rebased ontop of Linux 4.16-rc4
>
> Changes since V3:
> - remove the pre-sleep ->poll_mask call in vfs_poll,
> allow ->get_poll_head to return POLL* values.
>
> Changes since V2:
> - removed a double initialization
> - new vfs_get_poll_head helper
> - document that ->get_poll_head can return NULL
> - call ->poll_mask before sleeping
> - various ACKs
> - add conversion of random to ->poll_mask
> - add conversion of af_alg to ->poll_mask
> - lacking ->poll_mask support now returns -EINVAL for IOCB_CMD_POLL
> - reshuffled the series so that prep patches and everything not
> requiring the new in-kernel poll API is in the beginning
>
> Changes since V1:
> - handle the NULL ->poll case in vfs_poll
> - dropped the file argument to the ->poll_mask socket operation
> - replace the ->pre_poll socket operation with ->get_poll_head as
> in the file operations
---end quoted text---
next prev parent reply other threads:[~2018-03-13 7:46 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 21:27 aio poll, io_pgetevents and a new in-kernel poll API V5 Christoph Hellwig
2018-03-05 21:27 ` [PATCH 01/36] aio: don't print the page size at boot time Christoph Hellwig
2018-03-20 0:11 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 02/36] aio: remove an outdated comment in aio_complete Christoph Hellwig
2018-03-20 0:12 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 03/36] aio: refactor read/write iocb setup Christoph Hellwig
2018-03-20 0:19 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 04/36] aio: sanitize ki_list handling Christoph Hellwig
2018-03-20 0:21 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 05/36] aio: simplify cancellation Christoph Hellwig
2018-03-20 0:25 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 06/36] aio: delete iocbs from the active_reqs list in kiocb_cancel Christoph Hellwig
2018-03-20 0:34 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 07/36] aio: add delayed cancel support Christoph Hellwig
2018-03-20 3:19 ` Darrick J. Wong
2018-03-20 15:20 ` Christoph Hellwig
2018-03-05 21:27 ` [PATCH 08/36] aio: implement io_pgetevents Christoph Hellwig
2018-03-05 21:51 ` Jeff Moyer
2018-03-20 2:12 ` Darrick J. Wong
2018-03-20 15:22 ` Christoph Hellwig
2018-03-20 15:30 ` Jeff Moyer
2018-03-20 15:31 ` Christoph Hellwig
2018-03-20 15:34 ` Jeff Moyer
2018-03-05 21:27 ` [PATCH 09/36] fs: unexport poll_schedule_timeout Christoph Hellwig
2018-03-20 2:13 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 10/36] fs: cleanup do_pollfd Christoph Hellwig
2018-03-20 2:14 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 11/36] fs: update documentation for __poll_t Christoph Hellwig
2018-03-20 2:19 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 12/36] fs: add new vfs_poll and file_can_poll helpers Christoph Hellwig
2018-03-20 2:27 ` Darrick J. Wong
2018-03-05 21:27 ` [PATCH 13/36] fs: introduce new ->get_poll_head and ->poll_mask methods Christoph Hellwig
2018-03-20 3:29 ` Darrick J. Wong
2018-03-20 15:39 ` Christoph Hellwig
2018-03-05 21:27 ` [PATCH 14/36] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-03-05 21:51 ` Jeff Moyer
2018-03-05 21:27 ` [PATCH 15/36] net: refactor socket_poll Christoph Hellwig
2018-03-05 21:27 ` [PATCH 16/36] net: add support for ->poll_mask in proto_ops Christoph Hellwig
2018-03-05 21:27 ` [PATCH 17/36] net: remove sock_no_poll Christoph Hellwig
2018-03-05 21:27 ` [PATCH 18/36] net/tcp: convert to ->poll_mask Christoph Hellwig
2018-03-05 21:27 ` [PATCH 19/36] net/unix: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 20/36] net: convert datagram_poll users tp ->poll_mask Christoph Hellwig
2018-03-05 21:27 ` [PATCH 21/36] net/dccp: convert to ->poll_mask Christoph Hellwig
2018-03-05 21:27 ` [PATCH 22/36] net/atm: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 23/36] net/vmw_vsock: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 24/36] net/tipc: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 25/36] net/sctp: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 26/36] net/bluetooth: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 27/36] net/caif: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 28/36] net/nfc: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 29/36] net/phonet: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 30/36] net/iucv: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 31/36] net/rxrpc: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 32/36] crypto: af_alg: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 33/36] pipe: " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 34/36] eventfd: switch " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 35/36] timerfd: convert " Christoph Hellwig
2018-03-05 21:27 ` [PATCH 36/36] random: " Christoph Hellwig
2018-03-13 7:46 ` Christoph Hellwig [this message]
2018-03-19 8:35 ` aio poll, io_pgetevents and a new in-kernel poll API V5 Christoph Hellwig
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