From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <ak@suse.de>,
Linux Memory Management <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2.6.13] lockless pagecache 2/7
Date: Sat, 03 Sep 2005 11:40:59 +1000 [thread overview]
Message-ID: <4318FF2B.6000805@yahoo.com.au> (raw)
In-Reply-To: <1125705471.30867.40.camel@localhost.localdomain>
Alan Cox wrote:
>>but I suspect that SMP isn't supported on those CPUs without ll/sc,
>>and thus an atomic_cmpxchg could be emulated by disabling interrupts.
>
>
> It's obviously emulatable on any platform - the question is at what
> cost. For x86 it probably isn't a big problem as there are very very few
> people who need to build for 386 any more and there is already a big
> penalty for such chips.
>
>
Thanks Alan, Dave, others.
We'll see how things go. I'm fairly sure that for my usage it will
be a win even if it is costly. It is replacing an atomic_inc_return,
and a read_lock/read_unlock pair.
But if it does one day get merged, and proves to be very costly on
some architectures then we'll need to be careful about where it gets
used.
Nick
--
SUSE Labs, Novell Inc.
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next prev parent reply other threads:[~2005-09-03 1:40 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
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 [this message]
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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