Date: Wed, 19 Jul 2017 15:54:27 -0700
From: Davidlohr Bueso <dave@stgolabs.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Elena Reshetova <elena.reshetova@intel.com>,
        linux-kernel@vger.kernel.org, peterz@infradead.org,
        gregkh@linuxfoundation.org, mingo@redhat.com, adobriyan@gmail.com,
        serge@hallyn.com, arozansk@redhat.com, keescook@chromium.org,
        Hans Liljestrand <ishkamiel@gmail.com>,
        David Windsor <dwindsor@gmail.com>
Subject: Re: [PATCH 1/3] ipc: convert ipc_namespace.count from atomic_t to
 refcount_t
Message-ID: <20170719225427.GD14395@linux-80c1.suse>
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On Wed, 19 Jul 2017, Andrew Morton wrote:

>I do rather dislike these conversions from the point of view of
>performance overhead and general code bloat.  But I seem to have lost
>that struggle and I don't think any of these are fastpath(?).

Well, since we now have fd25d19 (locking/refcount: Create unchecked atomic_t
implementation), performance is supposed to be ok. It would be lovely to have
some actual numbers nonetheless.

Thanks,
Davidlohr

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