From: Andrew Morton <akpm@osdl.org>
To: hugh@veritas.com, clameter@sgi.com, rmk@arm.linux.org.uk,
matthew@wil.cx, jdike@addtoit.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/9] mm: split page table lock
Date: Sun, 23 Oct 2005 15:22:45 -0700 [thread overview]
Message-ID: <20051023152245.4d1dc812.akpm@osdl.org> (raw)
In-Reply-To: <20051023142712.6c736dd3.akpm@osdl.org>
Andrew Morton <akpm@osdl.org> wrote:
>
> Hugh Dickins <hugh@veritas.com> wrote:
> >
> > In this implementation, the spinlock is tucked inside the struct page of
> > the page table page: with a BUILD_BUG_ON in case it overflows - which it
> > would in the case of 32-bit PA-RISC with spinlock debugging enabled.
>
> eh? It's going to overflow an unsigned long on x86 too:
Ah, I think I see what you've done: assume that .index, .lru and .virtual
are unused on pagetable pages, so we can just overwrite them.
ick. I think I prefer the union, although it'll make struct page bigger
for CONFIG_PREEMPT+CONFIG_SMP+NR_CPUS>=4. hmm.
next prev parent reply other threads:[~2005-10-23 22:23 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-22 16:18 [PATCH 0/9] mm: page fault scalability Hugh Dickins
2005-10-22 16:19 ` [PATCH 1/9] mm: i386 sh sh64 ready for split ptlock Hugh Dickins
2005-10-22 18:24 ` Paul Mundt
2005-10-22 16:22 ` [PATCH 2/9] mm: arm " Hugh Dickins
2005-10-22 17:02 ` Russell King
2005-10-23 8:27 ` Hugh Dickins
2005-10-25 2:45 ` Nicolas Pitre
2005-10-25 6:31 ` Hugh Dickins
2005-10-25 14:55 ` Nicolas Pitre
2005-10-25 7:55 ` Russell King
2005-10-25 15:00 ` Nicolas Pitre
2005-10-26 0:20 ` Russell King
2005-10-26 1:26 ` Nicolas Pitre
2005-10-31 22:19 ` Jesper Juhl
2005-10-31 22:27 ` Russell King
2005-10-31 22:34 ` Jesper Juhl
2005-10-31 22:50 ` Russell King
2005-10-22 16:23 ` [PATCH 3/9] mm: parisc pte atomicity Hugh Dickins
2005-10-22 16:33 ` Matthew Wilcox
2005-10-22 17:08 ` [parisc-linux] " James Bottomley
2005-10-23 9:02 ` Hugh Dickins
2005-10-23 15:05 ` James Bottomley
2005-10-24 4:36 ` Hugh Dickins
2005-10-24 14:56 ` James Bottomley
2005-10-24 16:49 ` Hugh Dickins
2005-10-22 16:24 ` [PATCH 4/9] mm: cris v32 mmu_context_lock Hugh Dickins
2005-10-22 16:25 ` [PATCH 5/9] mm: uml pte atomicity Hugh Dickins
2005-10-22 16:27 ` [PATCH 6/9] mm: uml kill unused Hugh Dickins
2005-10-22 19:23 ` Jeff Dike
2005-10-22 16:29 ` [PATCH 7/9] mm: split page table lock Hugh Dickins
2005-10-23 16:54 ` Nikita Danilov
2005-10-23 21:27 ` Andrew Morton
2005-10-23 22:22 ` Andrew Morton [this message]
2005-10-24 3:38 ` Hugh Dickins
2005-10-24 4:16 ` Andrew Morton
2005-10-24 4:58 ` Hugh Dickins
2005-10-24 3:09 ` Hugh Dickins
2005-10-23 21:49 ` Andrew Morton
2005-10-24 3:12 ` Hugh Dickins
2005-10-22 16:30 ` [PATCH 8/9] mm: fix rss and mmlist locking Hugh Dickins
2005-10-22 16:31 ` [PATCH 9/9] mm: update comments to pte lock Hugh Dickins
2005-10-23 7:49 ` [PATCH 6/9 take 2] mm: uml kill unused Hugh Dickins
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