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[49.180.249.6]) by smtp.gmail.com with ESMTPSA id ns14-20020a17090b250e00b0028c2de909e4sm2574940pjb.50.2024.01.09.14.23.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jan 2024 14:23:32 -0800 (PST) Received: from dave by dread.disaster.area with local (Exim 4.96) (envelope-from ) id 1rNKVN-008FeO-0H; Wed, 10 Jan 2024 09:23:29 +1100 Date: Wed, 10 Jan 2024 09:23:29 +1100 From: Dave Chinner To: Johannes Thumshirn Cc: "dsterba@suse.cz" , Jan Kara , Matthew Wilcox , "lsf-pc@lists.linux-foundation.org" , "linux-scsi@vger.kernel.org" , "linux-ide@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , "linux-mm@kvack.org" , "linux-fsdevel@vger.kernel.org" , "linux-btrfs@vger.kernel.org" Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC] Removing GFP_NOFS Message-ID: References: <20240105105736.24jep6q6cd7vsnmz@quack3> <20f3de31-fbb0-4d8b-8f34-aa1beba9afc9@wdc.com> <20240108173928.GB28693@twin.jikos.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 1BDDE40020 X-Stat-Signature: 43tc7fx74mwgndjuqwwihw9ckxf4gupp X-HE-Tag: 1704839013-47868 X-HE-Meta: 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 zQm/Mris 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.042341, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jan 09, 2024 at 07:43:54AM +0000, Johannes Thumshirn wrote: > On 08.01.24 18:40, David Sterba wrote: > >> 199 - btrfs > > > > All the easy conversions to scoped nofs allocaionts have been done, the > > rest requires to add saving the nofs state at the transactions tart, as > > said in above. I have a wip series for that, updated every few releases > > but it's intrusive and not finished for a testing run. The number of > > patches is over 100, doing each conversion separately, the other generic > > changes are straightforward. > > > > It's possible to do it incrementally, there's one moster patch (300 > > edited lines) to add a stub parameter to transaction start, > > https://lore.kernel.org/linux-btrfs/20211018173803.18353-1-dsterba@suse.com/ . > > There are some counter points in the discussion if it has to be done > > like that but IIRC it's not possible, I have examples why not. > > > > At a first glance, storing the nofs scope in the transaction handle like > Filipe proposed sounds like a good idea to me. That's exactly what XFS has done for the last couple of decades. :) Cheers, Dave. -- Dave Chinner david@fromorbit.com