From: "David S. Miller" <davem@davemloft.net>
From: Nick Piggin <nickpiggin@yahoo.com.au>
To: nickpiggin@yahoo.com.au
Cc: ak@suse.de, alan@lxorguk.ukuu.org.uk, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.13] lockless pagecache 2/7
Date: Fri, 02 Sep 2005 14:31:49 -0700 (PDT) [thread overview]
Date: Sat, 03 Sep 2005 07:22:18 +1000 [thread overview]
Message-ID: <20050902.143149.08652495.davem@davemloft.net> (raw)
In-Reply-To: <4318C28A.5010000@yahoo.com.au>
> This atomic_cmpxchg, unlike a "regular" cmpxchg, has the advantage
> that the memory altered should always be going through the atomic_
> accessors, and thus should be implementable with spinlocks.
>
> See for example, arch/sparc/lib/atomic32.c
>
> At least, that's what I'm hoping for.
Ok, as long as the rule is that all accesses have to go
through accessor macros, it would work. This is not true
for existing uses of cmpxchg() btw, userland accesses shared
locks with the kernel would using any kind of accessors we
can control.
This means that your atomic_cmpxchg() cannot be used for locking
objects shared with userland, as DRM wants, since the hashed spinlock
trick does not work in such a case.
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next prev parent reply other threads:[~2005-09-02 21:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-02 6:25 New lockless pagecache Nick Piggin
2005-09-02 6:28 ` [PATCH 2.6.13] lockless pagecache 1/7 Nick Piggin
2005-09-02 6:29 ` [PATCH 2.6.13] lockless pagecache 2/7 Nick Piggin
2005-09-02 6:30 ` [PATCH 2.6.13] lockless pagecache 3/7 Nick Piggin
2005-09-02 6:30 ` [PATCH 2.6.13] lockless pagecache 4/7 Nick Piggin
2005-09-02 6:31 ` [PATCH 2.6.13] lockless pagecache 5/7 Nick Piggin
2005-09-02 6:32 ` [PATCH 2.6.13] lockless pagecache 6/7 Nick Piggin
2005-09-02 6:32 ` [PATCH 2.6.13] lockless pagecache 7/7 Nick Piggin
2005-09-09 13:00 ` Christoph Lameter
2005-09-09 15:23 ` Nick Piggin
2005-09-09 5:36 ` [PATCH 2.6.13] lockless pagecache 5/7 Christoph Lameter
2005-09-09 6:22 ` Nick Piggin
2005-09-02 13:08 ` [PATCH 2.6.13] lockless pagecache 2/7 Alan Cox
2005-09-02 20:41 ` Andi Kleen
2005-09-02 21:12 ` David S. Miller, Andi Kleen
2005-09-02 21:43 ` Nick Piggin
2005-09-02 21:22 ` Nick Piggin
2005-09-02 21:31 ` David S. Miller, Nick Piggin [this message]
2005-09-02 21:47 ` Nick Piggin
2005-09-02 21:57 ` David S. Miller, Nick Piggin
2005-09-02 23:57 ` Alan Cox
2005-09-03 1:40 ` Nick Piggin
2005-09-03 17:31 ` Alan Cox
2005-09-04 1:01 ` Nick Piggin
2005-09-04 8:20 ` Alan Cox
2005-09-06 1:03 ` Nick Piggin
2005-09-02 18:26 ` Christoph Lameter
2005-09-02 21:26 ` Nick Piggin
2005-09-03 1:33 ` Christoph Lameter
2005-09-02 6:45 ` New lockless pagecache Nick Piggin
2005-09-15 19:50 ` Alok kataria
2005-09-16 3:12 ` Nick Piggin
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