>>> On 09.08.12 at 17:03, "Kirill A. Shutemov"
>>> wrote:
> ENTRY(clear_page_nocache)
> CFI_STARTPROC
> - xorl %eax,%eax
> - movl $4096/64,%ecx
> + push %rdi
> + call kernel_fpu_begin
> + pop%rdi
You use CFI annotations elsewhere, so why don't you use
pushq
From: Andi Kleen
With multiple threads vector stores are more efficient, so use them.
This will cause the page clear to run non preemptable and add some
overhead. However on 32bit it was already non preempable (due to
kmap_atomic) and there is an preemption opportunity every 4K unit.
On a NPB (N
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