David Vrabel 1c32cdc633 xen/x86: avoid updating TLS descriptors if they haven't changed ... When switching tasks in a Xen PV guest, avoid updating the TLS descriptors if they haven't changed. This improves the speed of context switches by almost 10% as much of the time the descriptors are the same or only one is different. The descriptors written into the GDT by Xen are modified from the values passed in the update_descriptor hypercall so we keep shadow copies of the three TLS descriptors to compare against. lmbench3 test Before After Improvement -------------------------------------------- lat_ctx -s 32 24 7.19 6.52 9% lat_pipe 12.56 11.66 7% Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2012-07-19 15:51:57 -04:00
..
boot	x86, efi stub: Add .reloc section back into image	2012-06-07 09:52:33 -07:00
configs	x86/kconfig: Remove CONFIG_TR=y from the defconfigs	2012-03-24 08:18:03 +01:00
crypto	crypto: aesni-intel - fix unaligned cbc decrypt for x86-32	2012-05-31 20:53:22 +10:00
ia32	most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set	2012-06-01 12:58:51 -04:00
include/asm	xen/mce: Add mcelog support for Xen platform	2012-07-19 15:51:36 -04:00
kernel	x86, MCE, AMD: Adjust initcall sequence for xen	2012-07-19 15:51:37 -04:00
kvm	KVM: MMU: fix huge page adapted on non-PAE host	2012-05-28 17:41:15 +03:00
lguest
lib	perf/x86: Fix broken LBR fixup code	2012-06-13 15:00:28 +02:00
math-emu	x86: Rename trap_no to trap_nr in thread_struct	2012-03-13 06:24:09 +01:00
mm	x86/mm: Fix some kernel-doc warnings	2012-06-11 10:54:45 +02:00
net	bpf jit: Let the x86 jit handle negative offsets	2012-04-03 18:01:41 -04:00
oprofile	x86: Factor out TIF_IA32 from 32-bit address space	2012-02-20 12:48:46 -08:00
pci	Features:	2012-05-24 16:02:08 -07:00
platform	x86/uv: Fix UV2 BAU legacy mode	2012-06-08 11:48:28 +02:00
power	x86, kvm: Call restore_sched_clock_state() only after %gs is initialized	2012-04-02 13:53:00 +02:00
realmode	x86, realmode: Move end signature into header.S	2012-05-21 00:02:45 -07:00
syscalls	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
tools	x86/decoder: Fix bsr/bsf/jmpe decoding with operand-size prefix	2012-06-06 08:54:18 +02:00
um	x86, um: Correct syscall table type attributes breaking gcc 4.8	2012-06-09 12:51:09 -07:00
vdso	Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-29 18:12:23 -07:00
video	x86: Use vga_default_device() when determining whether an fb is primary	2012-04-24 09:50:17 +01:00
xen	xen/x86: avoid updating TLS descriptors if they haven't changed	2012-07-19 15:51:57 -04:00
.gitignore
Kbuild	x86, realmode: realmode.bin infrastructure	2012-05-08 11:41:48 -07:00
Kconfig	x86, efi: Add EFI boot stub documentation	2012-06-01 09:11:41 -07:00
Kconfig.cpu	x86: Tighten dependencies of CPU_SUP_*_32	2012-03-08 10:57:34 +01:00
Kconfig.debug
Makefile	md updates for 3.5	2012-05-23 17:08:40 -07:00
Makefile_32.cpu
Makefile.um	um: fix linker script generation	2012-04-09 13:59:00 -04:00