linux-kernel - Re: [GIT PULL] Btrfs updates for 4.20, part 1

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Message-ID: <20181023111910.GO16290@suse.cz>
Date:   Tue, 23 Oct 2018 13:19:10 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Liu Bo <obuil.liubo@...il.com>
Cc:     Chris Mason <clm@...com>, torvalds@...ux-foundation.org,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Btrfs updates for 4.20, part 1

On Mon, Oct 22, 2018 at 05:23:36PM -0700, Liu Bo wrote:
> > Performance improvements:
> >
> > * blocking mode of path is gone, means that only the spinning mode is used;
> 
> I'd like to do a few corrections here, the transition from the
> spinning mode to blocking mode is removed, we still need blocking mode
> of path for sleeping context.

Ok, thanks. So for the purpose of merge changelog, the updated text:

* transition between blocking and spinning modes of path is gone, which
  originally resulted to more unnecessary wakeups and updates to the
  path locks, the effects are measurable and improve latency and
  scalability