From: "David S. Miller" <davem@davemloft.net>
From: Andi Kleen <ak@suse.de>
To: ak@suse.de
Cc: alan@lxorguk.ukuu.org.uk, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au
Subject: Re: [PATCH 2.6.13] lockless pagecache 2/7
Date: Fri, 02 Sep 2005 14:12:55 -0700 (PDT) [thread overview]
Date: 02 Sep 2005 22:41:31 +0200 [thread overview]
Message-ID: <20050902.141255.50099210.davem@davemloft.net> (raw)
In-Reply-To: <p73k6hzqk1w.fsf@verdi.suse.de>
> > Yeah quite a few. I suspect most MIPS also would have a problem in this
> > area.
>
> cmpxchg can be done with LL/SC can't it? Any MIPS should have that.
Right.
On PARISC, I don't see where they are emulating compare and swap
as indicated. They are doing the funny hashed spinlocks for the
atomic_t operations and bitops, but that is entirely different.
cmpxchg() has to operate in an environment where, unlike the atomic_t
and bitops, you cannot control the accessors to the object at all.
The DRM is the only place in the kernel that requires cmpxchg()
and you can thus make a list of what platform can provide cmpxchg()
by which ones support DRM and thus provide the cmpxchg() macro already
in asm/system.h
We really can't require support for this primitive kernel wide, it's
simply not possible on a couple chips.
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next prev parent reply other threads:[~2005-09-02 21:12 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 [this message]
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
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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