David Miller a écrit :
From: Eric Dumazet <[EMAIL PROTECTED]>
Date: Thu, 15 Mar 2007 07:28:35 +0100
One problem with your patch is that all read_always() of pointers are going to
use 3 bytes more of code, thus raising icache pressure.
48 b8 c3 08 e8 8c af mov $0x71af8ce808c3,%rax
71 00 00
instead of %rip relative addressing
48 8b 05 99 f3 09 00 mov 652185(%rip),%rax
Could we obtain %rip relative addressing with the ELF
relocation approach I mentioned?
I dont think so, because 32 bits relative to %rip is not enough to cover all
the addresses that a 64bits kernel can use :)
%rip relative addressing works only because all the x86_64 kernel (text+
static/bss data) are in the 0xffffffff80000000 - fffffffffff00000 2^31 quadrant
but vmalloc() range for example is ffffc20000000000 - ffffe1ffffffffff (45
bits)
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