On Tue, 10 Oct 2000, Jamie Lokier wrote:
>> > 1. Move the error_code block from divide_error to page_fault;
>> >this removes one jump from the page_fault path.
>>
>> It is not clear that it is worth it. You want to align error_code and
>> page_fault to 16 or 32 bytes bytes at least, and it w
Linus Torvalds wrote:
> > The assembler doesn't use nops for alignment -- it inserts longer
> > instructions that are effectively nops, either 1 or two. For larger
> > stretches, the assembler inserts a jmp itself for alignment.
>
> Note that some of them are not very good no-ops. At least at so
On Tue, 10 Oct 2000, Jamie Lokier wrote:
>
> The assembler doesn't use nops for alignment -- it inserts longer
> instructions that are effectively nops, either 1 or two. For larger
> stretches, the assembler inserts a jmp itself for alignment.
Note that some of them are not very good no-ops.
Andi Kleen wrote:
> > 1. Move the error_code block from divide_error to page_fault;
> >this removes one jump from the page_fault path.
>
> It is not clear that it is worth it. You want to align error_code and
> page_fault to 16 or 32 bytes bytes at least, and it would need to execute
> some n
On Mon, Oct 09, 2000 at 08:37:55PM +0200, Mikael Pettersson wrote:
> We could also do the following:
>
> 1. Move the error_code block from divide_error to page_fault;
>this removes one jump from the page_fault path.
It is not clear that it is worth it. You want to align error_code and
page_f
On Wed, 04 Oct 2000, Brian Gerst wrote:
>Mikulas Patocka wrote:
>>
>> Hi.
>>
>> arch/i386/kernel/entry.S
>> xchgl %eax, ORIG_EAX(%esp) # orig_eax (get the error code. )
>> movl %esp,%edx
>> xchgl %ecx, ES(%esp)# get the address and save es.
>> pu
Mikulas Patocka wrote:
>
> Hi.
>
> arch/i386/kernel/entry.S
> xchgl %eax, ORIG_EAX(%esp) # orig_eax (get the error code. )
> movl %esp,%edx
> xchgl %ecx, ES(%esp)# get the address and save es.
> pushl %eax # push the error cod
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