linux-stable-rt/include
Jeremy Fitzhardinge 464d1a78fb [PATCH] i386: Convert i386 PDA code to use %fs
Convert the PDA code to use %fs rather than %gs as the segment for
per-processor data.  This is because some processors show a small but
measurable performance gain for reloading a NULL segment selector (as %fs
generally is in user-space) versus a non-NULL one (as %gs generally is).

On modern processors the difference is very small, perhaps undetectable.
Some old AMD "K6 3D+" processors are noticably slower when %fs is used
rather than %gs; I have no idea why this might be, but I think they're
sufficiently rare that it doesn't matter much.

This patch also fixes the math emulator, which had not been adjusted to
match the changed struct pt_regs.

[frederik.deweerdt@gmail.com: fixit with gdb]
[mingo@elte.hu: Fix KVM too]

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Ian Campbell <Ian.Campbell@XenSource.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Zachary Amsden <zach@vmware.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2007-02-13 13:26:20 +01:00
..
acpi
asm-alpha
asm-arm
asm-arm26
asm-avr32
asm-cris
asm-frv
asm-generic
asm-h8300
asm-i386 [PATCH] i386: Convert i386 PDA code to use %fs 2007-02-13 13:26:20 +01:00
asm-ia64 [PATCH] ia64: 2048-byte command line 2007-02-12 09:48:39 -08:00
asm-m32r
asm-m68k
asm-m68knommu
asm-mips
asm-parisc
asm-powerpc [PATCH] ps3: cleanup ps3fb before clearing HPTE 2007-02-12 09:48:44 -08:00
asm-ppc
asm-s390
asm-sh
asm-sh64
asm-sparc
asm-sparc64 [SPARC64]: Increase command line size to 2048 like other arches. 2007-02-12 15:15:47 -08:00
asm-um
asm-v850
asm-x86_64 [PATCH] x86-64: Allocate the NUMA hash function nodemap dynamically 2007-02-13 13:26:19 +01:00
asm-xtensa
crypto
keys
linux [NETFILTER]: ip_conntrack: fix invalid conntrack statistics RCU assumption 2007-02-12 11:13:14 -08:00
math-emu
media
mtd
net [NETFILTER]: nf_conntrack: change nf_conntrack_l[34]proto_unregister to void 2007-02-12 11:14:28 -08:00
pcmcia
rdma
rxrpc
scsi
sound [PATCH] mark struct file_operations const 1 2007-02-12 09:48:44 -08:00
video [PATCH] Video: fb, add true ref_count atomicity 2007-02-12 09:48:42 -08:00
Kbuild