Messages in this thread | | | Subject | Re: [PATCH v3 7/7] fs/ext4,jbd2: add support for passing write-hint with journal | From | "Martin K. Petersen" <> | Date | Tue, 02 Apr 2019 22:57:31 -0400 |
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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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