linux-kernel - Re: [patch] convert aio event reap to use atomic-op instead of spin

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Message-ID: <b040c32a0704110954q64694780v1d57937cfcc3466d@mail.gmail.com>
Date:	Wed, 11 Apr 2007 09:54:01 -0700
From:	"Ken Chen" <kenchen@...gle.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	linux-aio@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] convert aio event reap to use atomic-op instead of spin_lock

On 4/10/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 10 Apr 2007 16:53:53 -0700 (PDT) kenchen@...gle.com (Ken Chen) wrote:
>
> > +     } while (head != cmpxchg(&ring->head, head, head + 1));
>
> A hasty grep indicates that only 14 out of 23 architectures implement
> cmpxchg().

Sorry I wasn't thorough enough.  And partially because I was worried
about changing structure type for user space facing struct aio_ring.
Now that I looked through all arches, it looks safe as all arch's
atomic_t has the same size as int.

Here is the updated patch.

View attachment "aio-use-atomic.patch" of type "text/x-patch" (5718 bytes)