Re: [PATCH v3 7/7] fs/ext4,jbd2: add support for passing write-hint with journal

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux