From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2235520-1516298134-8-12333757272431876145 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no ("Email failed DMARC policy for domain") X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: X-IgnoreVacation: yes ("Email failed DMARC policy for domain") X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1516298134; b=EaPXHwBuNNOnaGOAcQlYnTSkXp5Df8H7iVJM4GEv6+blhCt W2PG2aJzucbLoM3shmDhhwSBM3oVdGKH5ITmqa6CyIjzpoCIMHs0+ZBRKdPCMMZ3 x0K3PoXAb/hoUVKL/9vv+TIrRHkETw+NQ4+nCRltAvRKJLd/eHwj7VDf1izWtDas K12V1mcv0/d7sHXf/mftb5bBl9eONXpyCM+ZVX8efEMrw6XPGvCRdYiJK4Xw/61U oSxF7/9ijk6BpRAwbq6KuQ8hmXAlitId44b63uJm6WGzntY65a1OLqEaTGHcL+Uv dpeCvjrbeesHq7Nat5w64W77MJhDqXbW19wxyxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:references:date :in-reply-to:message-id:mime-version:content-type:sender :list-id; s=arctest; t=1516298134; bh=2zMKYyKC3WpPO2FcHq61mEisSe upg8P0z1tl/Y1wneg=; b=UfJP8lRI+UdCOyHg4M7cxO6TSJB+yL7qPz9kirItAx V0262LLcTxVcDoCdx51SQyUo3cfIIq5aVVDOe1Nph0aSPsmcSw+LQRfJzmPeCar1 VZMWBqwTvh0Jf1+B6kQ1XU+R0oKWmST1PVi/ty9sowLoX2fU6eFRB5HgBgwEQaUq 75Q8fWge0Fl3HZS8/PZ2x+MsJGumiVJFMY9u03wOeOPQfyXdi1d39cnpb8OnsyOs +ZHY4OY0M9Q/d4MKqLOLjb3RpWkUGZrTzvuxvMPKbI0f2FG4f3ugMw95GW+MO4uW bWmlkgpgJD4om/Um4Xg4h6b+G0/XqG7edFTtCQMrze4A== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755243AbeARRy3 (ORCPT ); Thu, 18 Jan 2018 12:54:29 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46640 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754935AbeARRy1 (ORCPT ); Thu, 18 Jan 2018 12:54:27 -0500 From: Jeff Moyer To: Avi Kivity Cc: Christoph Hellwig , viro@zeniv.linux.org.uk, 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 V3 References: <20180117192742.710-1-hch@lst.de> <7f66bc5a-e9dd-fe4f-c07a-f3de3882365b@scylladb.com> X-PGP-KeyID: 1F78E1B4 X-PGP-CertKey: F6FE 280D 8293 F72C 65FD 5A58 1FF8 A7CA 1F78 E1B4 X-PCLoadLetter: What the f**k does that mean? Date: Thu, 18 Jan 2018 12:54:25 -0500 In-Reply-To: <7f66bc5a-e9dd-fe4f-c07a-f3de3882365b@scylladb.com> (Avi Kivity's message of "Thu, 18 Jan 2018 19:51:09 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Avi Kivity writes: > On 01/18/2018 05:46 PM, Jeff Moyer wrote: >> FYI, this kernel has issues. It will boot up, but I don't have >> networking, and even rebooting doesn't succeed. I'm looking into it. > > FWIW, I'm running an older version of this patchset on my desktop with > no problems so far. Right, it's worth mentioning that v1 worked fine for me. -Jeff >> Christoph Hellwig writes: >> >>> 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.3 >>> >>> Gitweb: >>> >>> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll.3 >>> >>> 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 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 >>> >>> -- >>> To unsubscribe, send a message with 'unsubscribe linux-aio' in >>> the body to majordomo@kvack.org. For more info on Linux AIO, >>> see: http://www.kvack.org/aio/ >>> Don't email: aart@kvack.org > > > -- > To unsubscribe, send a message with 'unsubscribe linux-aio' in > the body to majordomo@kvack.org. For more info on Linux AIO, > see: http://www.kvack.org/aio/ > Don't email: aart@kvack.org