From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1769925-1522223028-2-8425142167442507278 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, 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='CN', FromHeader='de', MailFrom='org' X-Spam-charsets: 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=1522223028; b=qhVn3GcSjH6HaKzBbl+AKFMAEanTg/cdCda6tN7QgyCf1ht Rsk1zJ03LjR0EFM+h1OwUh8rrFN5PB0hyGzum0zXgIYPux5n7fo6yVTQHAQLxGXo yGF3XU2f/gfeKr/TNEq/To6Oa6zKPGV6V0Za9x3EacLjRrEMaMo8YMfgRXejhWWj 1+w5YW1bE3jG/dvW7wLTg99/cSp7Yl84UtjBkeL+WqxCsSJys4/yQ32w2YxxOdhQ DDUeU+XWlmfI1UeTEAB9loto/KQC4GU5BNxyx25wz2Jjjk0P3ZTAxvqxjttfzqD1 vVEZeThxxhTLK5DfzXAvrgmJ1k/O1u7vz3C3I4w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id:sender :list-id; s=arctest; t=1522223028; bh=6mfFZjqAS/byLncYzOtPEVM8rC bTA7p/rJUTL77mn2I=; b=jnZRj0AT/TqkAGUfwoltz975hol5h5dkXOwho5rYHl qOGVhaYqzh0wo0HFCx7dmzW+YZXn+VDrnvunlnXe2q8h/B0cE9OXB0gIPH4vrwDm rD7RiN0t/suuzEZs6W2XXCnAHMf+OmSdL1CRXLBbyk54tynlzslILeMCSg+9AW3/ I1Edj7BNsgCIFoKjTkjoLt2jSGZmXg+njyF0oHwgUZ6rLPKy4+mzWJSxDTkz5eYQ ntbSE3jNW+nw0JjmH7WSTjbmRYSkXQNgC1ySGB7v+3bqMRilk2FEA1w2+ab+V0LC hlbKNsttks4/X9MbVIED1p4lJn+kK5jnj23JvzhLE1Uw== ARC-Authentication-Results: i=1; mx4.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered, 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=gFbx7Tpz x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=lst.de; 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-cm=none score=0; 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=lst.de header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 Authentication-Results: mx4.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered, 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=gFbx7Tpz x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=lst.de; 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-cm=none score=0; 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=lst.de header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfBbcQDzX46dLdxzBHRSHHDvpU1bjcuwwZ6//cXFXDabfLmodVlVeTPyAy6w31hA6x4PYpNIhGTvrcrQWIOrYEge65zU+wFkrBh2S3Cm8c2wO+AHqZE/U wEixkdRdjZTkxTfYEC8RWvuC/b//22JWrdQAQ2DOTI5rlG0LGJKMkJ0G2V2Z4W8d9jWRNmIQEMolTs/R8uDxkeBeRomjPeDGTXF2n9adsYa8mYHbzudo1DW+ X-CM-Analysis: v=2.3 cv=JLoVTfCb c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=v2DPQv5-lfwA:10 a=JfrnYn6hAAAA:8 a=lViJMyulAAAA:8 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=rLNw0b5EA4H7YxAuHWgA:9 a=x8gzFH9gYPwA:10 a=1CNFftbPRP8L7MoqJWF3:22 a=gb9IC-u5QvZuJU0a8fSk:22 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752870AbeC1H3e (ORCPT ); Wed, 28 Mar 2018 03:29:34 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:46418 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752106AbeC1H3c (ORCPT ); Wed, 28 Mar 2018 03:29:32 -0400 From: Christoph Hellwig To: viro@zeniv.linux.org.uk Cc: Avi Kivity , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: aio poll and a new in-kernel poll API V7 Date: Wed, 28 Mar 2018 09:28:56 +0200 Message-Id: <20180328072926.17131-1-hch@lst.de> X-Mailer: git-send-email 2.14.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html 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: 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. This series sits on top of the aio-fsync series that also includes support for io_pgetevents. 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.7 Gitweb: http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll.7 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 V7: - reworked cancellation Changes since V6: - small changelog updates - rebased on top of the aio-fsync changes 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: aio poll and a new in-kernel poll API V7 Date: Wed, 28 Mar 2018 09:28:56 +0200 Message-ID: <20180328072926.17131-1-hch@lst.de> Cc: Avi Kivity , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org To: viro@zeniv.linux.org.uk Return-path: Sender: owner-linux-aio@kvack.org List-Id: netdev.vger.kernel.org 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. This series sits on top of the aio-fsync series that also includes support for io_pgetevents. 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.7 Gitweb: http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/aio-poll.7 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 V7: - reworked cancellation Changes since V6: - small changelog updates - rebased on top of the aio-fsync changes 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 -- 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