From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail106.syd.optusnet.com.au ([211.29.132.42]:48983 "EHLO mail106.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726096AbfDKBbP (ORCPT ); Wed, 10 Apr 2019 21:31:15 -0400 Date: Thu, 11 Apr 2019 11:11:17 +1000 From: Dave Chinner Subject: Re: [POC][PATCH] xfs: reduce ilock contention on buffered randrw workload Message-ID: <20190411011117.GC29573@dread.disaster.area> References: <20190404165737.30889-1-amir73il@gmail.com> <20190404211730.GD26298@dastard> <20190408103303.GA18239@quack2.suse.cz> <1554741429.3326.43.camel@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1554741429.3326.43.camel@suse.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Davidlohr Bueso Cc: Jan Kara , Amir Goldstein , "Darrick J . Wong" , Christoph Hellwig , Matthew Wilcox , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org On Mon, Apr 08, 2019 at 09:37:09AM -0700, Davidlohr Bueso wrote: > On Mon, 2019-04-08 at 12:33 +0200, Jan Kara wrote: > > On Fri 05-04-19 08:17:30, Dave Chinner wrote: > > > FYI, I'm working on a range lock implementation that should both > > > solve the performance issue and the reader starvation issue at the > > > same time by allowing concurrent buffered reads and writes to > > > different file ranges. > > > > Are you aware of range locks Davidlohr has implemented [1]? It didn't get > > merged because he had no in-tree user at the time (he was more aiming at > > converting mmap_sem which is rather difficult). But the generic lock > > implementation should be well usable. > > > > Added Davidlohr to CC. > > > > Honza > > > > [1] https://lkml.org/lkml/2017/3/7/22 > > fyi this was the latest version (had some naming updates per peterz). > > https://lkml.org/lkml/2018/2/4/232 No, I wasn't aware of these because they haven't ever been posted to a list I subscribe to and they haven't been merged. I'll go have a look at them over the next few days. Cheers, Dave. -- Dave Chinner david@fromorbit.com