From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: Re: remove dead bdi congestion leftovers Date: Wed, 1 Jul 2020 19:25:38 +0100 Message-ID: <20200701182538.GU25523@casper.infradead.org> References: <20200701090622.3354860-1-hch@lst.de> <20200701164103.GC27063@redhat.com> <20200701175747.GT25523@casper.infradead.org> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=79iDJfFRYlYHrisn3ouDHG53Aq0lK8z2VddrdPxeVyA=; b=o7SDqMAwBo7t+TzTt83Wnbb4Mf /u3FPb35bitwFjn51sx/gj3Y9SatyNLQ4rgWXHyeRpDSuy2msqXigA7OPbbMBLBZH4hqJdMl6nn4j o+oNlcrRUlnxx6s1auiuL4a9abVDq46ghr0Ywah7Ao7UudMSVkL0IvmrZuixAAq9t7XLxby/vTDpD 66p1DhcwBNMn2HW7Kd0s1SbNOfzFt7MnNzqs6ZeP2YjAYbVADLriPSyKR43Cxp2dGBQbRz1ID7kyG wnhB7OkOwvB4o3qDO8VvcqOP5sGj6DpgyZfHicwM2Rmsyv+O6qL0Q2QA193Apy1eQwBhl+yj/wnuE eK83FPaA==; Content-Disposition: inline In-Reply-To: <20200701175747.GT25523@casper.infradead.org> Sender: linux-bcache-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Mike Snitzer Cc: Christoph Hellwig , Jens Axboe , linux-raid@vger.kernel.org, linux-mm@kvack.org, linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, drbd-dev@tron.linbit.com, dm-devel@redhat.com, Tejun Heo , cgroups@vger.kernel.org, linux-btrfs@vger.kernel.org On Wed, Jul 01, 2020 at 06:57:47PM +0100, Matthew Wilcox wrote: > On Wed, Jul 01, 2020 at 12:41:03PM -0400, Mike Snitzer wrote: > > On Wed, Jul 01 2020 at 5:06am -0400, > > Christoph Hellwig wrote: > > > > > Hi Jens, > > > > > > we have a lot of bdi congestion related code that is left around without > > > any use. This series removes it in preparation of sorting out the bdi > > > lifetime rules properly. > > > > I could do some git archeology to see what the fs, mm and block core > > changes were to stop using bdi congested but a pointer to associated > > changes (or quick recap) would save me some time. > > > > Also, curious to know how back-pressure should be felt back up the IO > > stack now? (apologies if these are well worn topics, I haven't been > > tracking this area of development). > > It isn't. Jens declared the implementation was broken, and broke it > more. So we're just living with stupid broken timeouts. Here's a thread about it. This would have been a discussion topic at LSFMM2020, but COVID. https://lore.kernel.org/linux-mm/20190917115824.16990-1-linf@wangsu.com/T/#u