Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal

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To: Jan Kara <jack@xxxxxxx>
Subject: Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
From: "'Christoph Hellwig'" <hch@xxxxxxxxxxxxx>
Date: Tue, 21 May 2019 01:28:46 -0700
Cc: "'Christoph Hellwig'" <hch@xxxxxxxxxxxxx>, kanchan <joshi.k@xxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, prakash.v@xxxxxxxxxxx, anshul@xxxxxxxxxxx, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
In-reply-to: <20190521082528.GA17709@quack2.suse.cz>
References: <CGME20190425112347epcas2p1f7be48b8f0d2203252b8c9dd510c1b61@epcas2p1.samsung.com> <1556191202-3245-1-git-send-email-joshi.k@samsung.com> <20190510170249.GA26907@infradead.org> <00fb01d50c71$dd358e50$97a0aaf0$@samsung.com> <20190520142719.GA15705@infradead.org> <20190521082528.GA17709@quack2.suse.cz>
User-agent: Mutt/1.9.2 (2017-12-15)

On Tue, May 21, 2019 at 10:25:28AM +0200, Jan Kara wrote:
> performance benefits for some drives. After all you can just think about it
> like RWH_WRITE_LIFE_JOURNAL type of hint available for the kernel...

Except that it actuallys adds a parallel insfrastructure.  A
RWH_WRITE_LIFE_JOURNAL would be much more palatable, but someone needs
to explain how that is:

 a) different from RWH_WRITE_LIFE_SHORT
 b) would not apply to a log/journal maintained in userspace that works
    exactly the same

Follow-Ups:
- Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: Jan Kara

References:
- [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: Kanchan Joshi
- Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: Christoph Hellwig
- RE: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: kanchan
- Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: 'Christoph Hellwig'
- Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal
  - From: Jan Kara

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