linux-kernel - RE: [PATCH 0/5] v3 block subsystem refcounter conversions

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Date:   Thu, 29 Jun 2017 07:38:04 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Jens Axboe <axboe@...nel.dk>, Kees Cook <keescook@...omium.org>
CC:     James Bottomley <james.bottomley@...senpartnership.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Linux Btrfs <linux-btrfs@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "fujita.tomonori@....ntt.co.jp" <fujita.tomonori@....ntt.co.jp>,
        Ingo Molnar <mingo@...hat.com>, Chris Mason <clm@...com>,
        Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>
Subject: RE: [PATCH 0/5] v3 block subsystem refcounter conversions


> On 06/28/2017 05:58 AM, Reshetova, Elena wrote:
> >
> >> Subject: Re: [PATCH 0/5] v3 block subsystem refcounter conversions
> >>
> >> On Tue, Jun 27, 2017 at 6:26 AM, Jens Axboe <axboe@...nel.dk> wrote:
> >>> On 06/27/2017 05:39 AM, Elena Reshetova wrote:
> >>>> Changes in v3:
> >>>> No changes in patches apart from trivial rebases, but now by
> >>>> default refcount_t = atomic_t and uses all atomic standard operations
> >>>> unless CONFIG_REFCOUNT_FULL is enabled. This is a compromize for the
> >>>> systems that are critical on performance and cannot accept even
> >>>> slight delay on the refcounter operations.
> >>>
> >>> Is that true in 4.12-rc, or is that true in a later release once
> >>> Linus has pulled those changes in? If the latter, please resend
> >>> this when those changes are in, thanks.
> >>
> >> It's in -next currently ("locking/refcount: Create unchecked atomic_t
> >> implementation")
> >
> > I would really like to start discussion on the these patches asap
> > since it normally takes some adjustments etc. before they can be
> > merged and we want many changes to go into next release round and not
> > to miss the merge window.
> 
> As far as I'm concerned, there's no need for a discussion on these. If
> the other patches go in to make it as light weight as what we currently
> have, then I'm fine with it. I can queue it up for post initial merge
> submission.

Ok, fair enough. Thank you very much!

Best Regards,
Elena.

> 
> --
> Jens Axboe