linux-kernel - Re: [PATCH 1/3] ipc: convert ipc_namespace.count from atomic_t to refcount

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Message-ID: <20170719225427.GD14395@linux-80c1.suse>
Date:   Wed, 19 Jul 2017 15:54:27 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        gregkh@...uxfoundation.org, mingo@...hat.com, adobriyan@...il.com,
        serge@...lyn.com, arozansk@...hat.com, keescook@...omium.org,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 1/3] ipc: convert ipc_namespace.count from atomic_t to
 refcount_t

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

>