From: William Lee Irwin III <wli@holomorphy.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [patch 2] mm: speculative get_page
Date: Tue, 28 Jun 2005 07:19:03 -0700 [thread overview]
Message-ID: <20050628141903.GR3334@holomorphy.com> (raw)
In-Reply-To: <20050627.220827.21920197.davem@davemloft.net>
On Mon, Jun 27, 2005 at 10:08:27PM -0700, David S. Miller wrote:
> BTW, I disagree with this assertion. spin_unlock() does imply a
> memory barrier.
> All memory operations before the release of the lock must execute
> before the lock release memory operation is globally visible.
The affected architectures have only recently changed in this regard.
ppc64 was the most notable case, where it had a barrier for MMIO
(eieio) but not a general memory barrier. PA-RISC likewise formerly had
no such barrier and was a more normal case, with no barrier whatsoever.
Both have since been altered, ppc64 acquiring a heavyweight sync
(arch nomenclature), and PA-RISC acquiring 2 memory barriers.
-- wli
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next prev parent reply other threads:[~2005-06-28 14:19 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-27 6:29 [rfc] lockless pagecache Nick Piggin
2005-06-27 6:32 ` [patch 1] mm: PG_free flag Nick Piggin
2005-06-27 6:32 ` [patch 2] mm: speculative get_page Nick Piggin
2005-06-27 6:33 ` [patch 3] radix tree: lookup_slot Nick Piggin
2005-06-27 6:34 ` [patch 4] radix tree: lockless readside Nick Piggin
2005-06-27 6:34 ` [patch 5] mm: lockless pagecache lookups Nick Piggin
2005-06-27 6:35 ` [patch 6] mm: spinlock tree_lock Nick Piggin
2005-06-27 14:12 ` [patch 2] mm: speculative get_page William Lee Irwin III
2005-06-28 0:03 ` Nick Piggin
2005-06-28 0:56 ` Nick Piggin
2005-06-28 1:22 ` William Lee Irwin III
2005-06-28 1:42 ` Nick Piggin
2005-06-28 4:06 ` William Lee Irwin III
2005-06-28 4:50 ` Nick Piggin
2005-06-28 5:08 ` [patch 2] mm: speculative get_page, " David S. Miller, Nick Piggin
2005-06-28 5:34 ` Nick Piggin
2005-06-28 14:19 ` William Lee Irwin III [this message]
2005-06-28 15:43 ` Nick Piggin
2005-06-28 17:01 ` Christoph Lameter
2005-06-28 23:10 ` Nick Piggin
2005-06-28 21:32 ` Jesse Barnes
2005-06-28 22:17 ` Christoph Lameter
2005-06-28 12:45 ` Andy Whitcroft
2005-06-28 13:16 ` Nick Piggin
2005-06-28 16:02 ` Dave Hansen
2005-06-29 16:31 ` Pavel Machek
2005-06-29 18:43 ` Dave Hansen
2005-06-29 21:22 ` Pavel Machek
2005-06-29 16:31 ` Pavel Machek
2005-06-27 6:43 ` VFS scalability (was: [rfc] lockless pagecache) Nick Piggin
2005-06-27 7:13 ` Andi Kleen
2005-06-27 7:33 ` VFS scalability Nick Piggin
2005-06-27 7:44 ` Andi Kleen
2005-06-27 8:03 ` Nick Piggin
2005-06-27 7:46 ` [rfc] lockless pagecache Andrew Morton
2005-06-27 8:02 ` Nick Piggin
2005-06-27 8:15 ` Andrew Morton
2005-06-27 8:28 ` Nick Piggin
2005-06-27 8:56 ` Lincoln Dale
2005-06-27 9:04 ` Nick Piggin
2005-06-27 18:14 ` Chen, Kenneth W
2005-06-27 18:50 ` Badari Pulavarty
2005-06-27 19:05 ` Chen, Kenneth W
2005-06-27 19:22 ` Christoph Lameter
2005-06-27 19:42 ` Chen, Kenneth W
2005-07-05 15:11 ` Sonny Rao
2005-07-05 15:31 ` Martin J. Bligh
2005-07-05 15:37 ` Sonny Rao
2005-06-27 13:17 ` Benjamin LaHaise
2005-06-28 0:32 ` Nick Piggin
2005-06-28 1:26 ` William Lee Irwin III
2005-06-27 14:08 ` Martin J. Bligh
2005-06-27 17:49 ` Christoph Lameter
2005-06-29 10:49 ` Hirokazu Takahashi
2005-06-29 11:38 ` Nick Piggin
2005-06-30 3:32 ` Hirokazu Takahashi
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