linux-ext4 - Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint for Ext4 journal

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Date:   Tue, 21 May 2019 01:28:46 -0700
From:   'Christoph Hellwig' <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     'Christoph Hellwig' <hch@...radead.org>,
        kanchan <joshi.k@...sung.com>, 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,
        prakash.v@...sung.com, anshul@...sung.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v5 0/7] Extend write-hint framework, and add write-hint
 for Ext4 journal

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