linux-kernel - Re: [PATCH RFC] mm: implement write-behind policy for sequential file writes

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Message-ID: <c684ee77-27a6-1522-b443-0c6d33d569a0@redhat.com>
Date:   Mon, 2 Oct 2017 13:23:18 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH RFC] mm: implement write-behind policy for sequential file
 writes

On 10/02/2017 11:54 AM, Konstantin Khlebnikov wrote:
> This patch implements write-behind policy which tracks sequential writes
> and starts background writeback when have enough dirty pages in a row.

Does this apply to data for files which have never been written to disk 
before?

I think one of the largest benefits of the extensive write-back caching 
in Linux is that the cache is discarded if the file is deleted before it 
is ever written to disk.  (But maybe I'm wrong about this.)

Thanks,
Florian