[RFC PATCH V2 4/4] arm64: mm: implement get_user_pages_fast
catalin.marinas at arm.com
Tue Feb 11 10:48:59 EST 2014
On Thu, Feb 06, 2014 at 04:18:51PM +0000, Steve Capper wrote:
> An implementation of get_user_pages_fast for arm64. It is based on the
> arm implementation (it has the added ability to walk huge puds) which
> is loosely on the PowerPC implementation. We disable interrupts in the
> walker to prevent the call_rcu_sched pagetable freeing code from
> running under us.
> We also explicitly fire an IPI in the Transparent HugePage splitting
> case to prevent splits from interfering with the fast_gup walker.
> As THP splits are relatively rare, this should not have a noticable
> Signed-off-by: Steve Capper <steve.capper at linaro.org>
> arch/arm64/include/asm/pgtable.h | 4 +
> arch/arm64/mm/Makefile | 2 +-
> arch/arm64/mm/gup.c | 297 +++++++++++++++++++++++++++++++++++++++
Why don't you make a generic gup.c implementation and let architectures
select it? I don't see much arm64-specific code in here.
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