From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-219634-1522984595-2-5829119805322677482 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 0.25, 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='uk', MailFrom='org' X-Spam-charsets: plain='us-ascii' 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=fm2; t= 1522984595; b=P1mYgCwA2gJitakgcWfC9BA6p1Yg/BOzjLvDIzrYOWoIqtymFa y0uakablUfT4Hk5UPE9XOKwEC5wnEOuZ6XggCJjCaCfRZ5VdnKLUNlWdkT0MIL80 8iGzXA1Onh8O3Cg6IP+OQEjvFgKFwhPYqaUOaMq3ixVtREbYIHDSFoVJDkWA6r8A SwDq7Mcsu1bxMW4YZOpp81UD9TSNoPNAsUw7PZWzyIDNa8/aa09Jy8xPrFrCoewe wZTrvNgf97uxf0p+Edva+iPb/dHERwuAkUYh8HJVOwRjxULBv5iVBYhLvm6P8Fk6 llen+yDR6sx9+1RFEovaG0ZBtIhrCYlRwfYw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to:sender :list-id; s=fm2; t=1522984595; bh=2a5rfmd8ci4K0vitRgnNb3X/GZmBz2 a2XG5Iya7WPNE=; b=U/sM2X4H6PmYhDRCTW9GkUIrgxJd5xMvjBj7IUs44/9/zl br/ai0swXC85c6DNpOJ4k3CBBlMCK7MFnS/UhR0Gw//7QYm9a/zRkVKBOFq72CKx rDCPpO7Wlz4jiY8RlUqfAirt81BVVfkFmImGFw8sjlmA/szLMSypV4eoWZJc5+h/ Q5aTmcJfrY7axqLhWjwSRiVCG5tG1D2gc/PNW9nOxgiSOPPD/GTrO+bffIgwt/N2 Sroy8vKsbZ//HzXRdu2il4GjmZSFeTgi1plsnUrXNo0qKieBJdOLCdD7hu3tadlt meskCnvzSaPhn4LB0uhEF0KpPvz+f+RTnw9DHpUw== ARC-Authentication-Results: i=1; mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=zeniv.linux.org.uk; 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=zeniv.linux.org.uk header.mx.error=NOERROR header.result=warn header_org.domain=linux.org.uk header_org.result=pass header_is_org_domain=no; x-vs=clean score=-100 state=0 Authentication-Results: mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=zeniv.linux.org.uk; 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=zeniv.linux.org.uk header.mx.error=NOERROR header.result=warn header_org.domain=linux.org.uk header_org.result=pass header_is_org_domain=no; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfKoipxtZwr2n8Pr8vOYxmqjMhih/K9oZpOlH1dMd0M4w4ZwJkZjq3rBsEG6+O2AZ79DCKrT7oRi58KHkjSe3I1nIEQbEFqGtzoo2LIv9y56epXiRsBI3 KgurNyNMlupnZ8rJ5gk6rYNwNOYvRfBizFschUkpLiA1pAzOZE6zjPL2ifyiQtaxgbWEUpjJjDJqOByrOCce8RzylPpO1eYFmg9y+xkPtiacx+UqFMQZ4JWh X-CM-Analysis: v=2.3 cv=Tq3Iegfh c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=kj9zAlcOel0A:10 a=Kd1tUaAdevIA:10 a=VwQbUJbxAAAA:8 a=zH6iRZEe8hjVWzGeBnIA:9 a=CjuIK1q_8ugA:10 a=x8gzFH9gYPwA:10 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425AbeDFDQd (ORCPT ); Thu, 5 Apr 2018 23:16:33 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:47308 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbeDFDQd (ORCPT ); Thu, 5 Apr 2018 23:16:33 -0400 Date: Fri, 6 Apr 2018 04:16:30 +0100 From: Al Viro To: Christoph Hellwig Cc: Avi Kivity , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: io_pgetevents & aio fsync V2 Message-ID: <20180406031630.GU30522@ZenIV.linux.org.uk> References: <20180328072639.16885-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180328072639.16885-1-hch@lst.de> User-Agent: Mutt/1.9.1 (2017-09-22) 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: On Wed, Mar 28, 2018 at 09:26:33AM +0200, Christoph Hellwig wrote: > Hi all, > > this patch adds workqueue based fsync offload. Version of this > patch have been floating around for a couple years, but we now > have a user with seastar used by ScyllaDB (who sponsored this > work) that really wants this in addition to the aio poll support. > More details are in the patch itself. > > Because the iocb types have been defined sine day one (and probably > were supported by RHEL3) libaio already supports these calls as-is. > > This also pulls in the aio cleanups and io_pgetevents support previously > submitted and review as part of the aio poll series. The aio poll > series will be resubmitted on top of this series BTW, this is only tangentially related, but... does *anything* call io_submit() for huge amounts of iocb? Check in do_io_submit() is insane - "no more than MAX_LONG total of _pointers_". Compat variant goes for "no more than a page worth of pointers" and there's a hard limit in ioctx_alloc() - we can't ever get more than 8M slots in ring buffer...