linux-ext4 - Re: [PATCH v2 0/4] Write-hint for FS journal

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Message-ID: <20190128124709.GB27972@quack2.suse.cz>
Date:   Mon, 28 Jan 2019 13:47:09 +0100
From:   Jan Kara <jack@...e.cz>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Kanchan Joshi <joshi.k@...sung.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-nvme@...ts.infradead.org, jack@...e.com, david@...morbit.com,
        tytso@....edu, prakash.v@...sung.com
Subject: Re: [PATCH v2 0/4] Write-hint for FS journal

On Fri 25-01-19 09:23:53, Keith Busch wrote:
> On Wed, Jan 09, 2019 at 09:00:57PM +0530, Kanchan Joshi wrote:
> > Towards supporing write-hints/streams for filesystem journal.                   
> >                                                                                 
> > Here is the v1 patch for background -                                           
> > https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2                        
> >                                                                                 
> > Changes since v1:                                                               
> > - introduce four more hints for in-kernel use, as recommended by Dave chinner   
> >   & Jens axboe. This isolates kernel-mode hints from user-mode ones.            
> 
> The nvme driver disables streams if the controller doesn't support
> BLK_MAX_WRITE_HINT number of streams, so this series breaks the feature
> for controllers that only support up to 4.

Right. Do you know if there are such controllers? Or are you just afraid
that there could be?

									Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR