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Date: Tue, 02 Apr 2019 22:57:31 -0400 From: "Martin K. Petersen" <martin.petersen@...cle.com> To: Kanchan Joshi <joshi.k@...sung.com> Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, axboe@...com, prakash.v@...sung.com, anshul@...sung.com, joshiiitr@...il.com Subject: Re: [PATCH v3 7/7] fs/ext4,jbd2: add support for passing write-hint with journal Kanchan, > For NAND based SSDs, mixing of data with different life-time reduces > efficiency of internal garbage-collection. During FS operations, > series of journal updates will follow/precede series of data/meta > updates, causing intermixing inside SSD. By passing a write-hint with > journal, its write can be isolated from other data/meta writes, > leading to endurance/performance benefit on SSD. Why not just introduce REQ_JOURNAL and let the device driver decide how to turn that into something appropriate for the device? That's what I'll need for SCSI. Existing SCSI streams are not a good fit. -- Martin K. Petersen Oracle Linux Engineering
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