linux-kernel - Re: [PATCH 0/5] v2: block subsystem refcounter conversions

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Message-ID: <20170421105654.GC31499@infradead.org>
Date:   Fri, 21 Apr 2017 03:56:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     "Reshetova, Elena" <elena.reshetova@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "james.bottomley@...senpartnership.com" 
        <james.bottomley@...senpartnership.com>,
        "linux-kernel@...r.kernel.org" <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@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "fujita.tomonori@....ntt.co.jp" <fujita.tomonori@....ntt.co.jp>,
        "mingo@...hat.com" <mingo@...hat.com>, "clm@...com" <clm@...com>,
        "jbacik@...com" <jbacik@...com>,
        "dsterba@...e.com" <dsterba@...e.com>
Subject: Re: [PATCH 0/5] v2: block subsystem refcounter conversions

On Thu, Apr 20, 2017 at 11:33:19AM -0700, Eric Biggers wrote:
> Like I suggested months ago, how about doing an efficient implementation of
> refcount_t which doesn't use the bloated cmpxchg loop?  Then there would be no
> need for endless performance arguments.  In fact, in PaX there are already
> example implementations for several architectures.  It's unfortunate that
> they're still being ignored for some reason.

Yes.  I will also NAK other conversions until this is done, which is a
bit sad as the recount_t API itself is very useful.