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Stephane Eranian d3a4f48d48 [PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw 
Hello,

Following my discussion with Andi. Here is a patch that introduces
two new TIF flags to simplify the context switch code in __switch_to().
The idea is to minimize the number of cache lines accessed in the common
case, i.e., when neither the debug registers nor the I/O bitmap are used.

This patch covers the x86-64 modifications. A patch for i386 follows.

Changelog:
	- add TIF_DEBUG to track when debug registers are active
	- add TIF_IO_BITMAP to track when I/O bitmap is used
	- modify __switch_to() to use the new TIF flags

<signed-off-by>: eranian@hpl.hp.com

Signed-off-by: Andi Kleen <ak@suse.de>
2006-09-26 10:52:28 +02:00
..
acpi Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpufreq Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
aperture.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
apic.c [PATCH] Add SMP support on x86_64 to reservation framework 2006-09-26 10:52:26 +02:00
asm-offsets.c [CRYPTO] all: Pass tfm instead of ctx to algorithms 2006-06-26 17:34:39 +10:00
audit.c [PATCH] audit: AUDIT_PERM support 2006-09-11 13:32:30 -04:00
crash.c [PATCH] kdump x86_64 nmi event notification fix 2006-09-26 10:52:27 +02:00
crash_dump.c [PATCH] kdump: read previous kernel's memory 2006-01-10 08:01:28 -08:00
e820.c Revert mmiocfg heuristics and blacklist changes 2006-09-19 08:15:22 -07:00
early_printk.c [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
entry.S [PATCH] Clean up asm/smp.h includes 2006-09-26 10:52:28 +02:00
functionlist [NET]: make skb_release_data() static 2006-06-29 16:58:30 -07:00
genapic.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
genapic_cluster.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
genapic_flat.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head.S [PATCH] Add the vgetcpu vsyscall 2006-09-26 10:52:28 +02:00
head64.c [PATCH] lockdep: x86_64 early init 2006-07-03 15:27:04 -07:00
i387.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
i8259.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
init_task.c [PATCH] x86_64: Save original IST values for checking stack addresses 2006-08-30 16:05:16 -07:00
io_apic.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ioport.c [PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw 2006-09-26 10:52:28 +02:00
irq.c [PATCH] lockdep: irqtrace subsystem, x86_64 support 2006-07-03 15:27:03 -07:00
k8.c [PATCH] x86_64: Clean and enhance up K8 northbridge access code 2006-06-26 10:48:15 -07:00
kprobes.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ldt.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
machine_kexec.c [PATCH] machine_kexec.c: Fix the description of segment handling 2006-07-31 13:28:38 -07:00
Makefile [PATCH] lockdep: stacktrace subsystem, x86_64 support 2006-07-03 15:27:02 -07:00
mce.c [PATCH] cpu hotplug: use hotplug version of registration in late inits 2006-07-31 13:28:39 -07:00
mce_amd.c [PATCH] cpu hotplug: use hotplug version of registration in late inits 2006-07-31 13:28:39 -07:00
mce_intel.c [PATCH] x86_64: Some housekeeping in local APIC code 2006-01-11 19:05:03 -08:00
module.c [PATCH] x86_64: x86_64 version of the smp alternative patch. 2006-06-26 10:48:14 -07:00
mpparse.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
nmi.c [PATCH] x86: i386/x86-64 Add nmi watchdog support for new Intel CPUs 2006-09-26 10:52:27 +02:00
pci-calgary.c [PATCH] x86_64: Calgary IOMMU - Multi-Node NULL pointer dereference fix 2006-07-29 20:59:55 -07:00
pci-dma.c [PATCH] x86_64: Calgary IOMMU - Calgary specific bits 2006-06-26 10:48:19 -07:00
pci-gart.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci-nommu.c [PATCH] x86_64: Fix CONFIG_IOMMU_DEBUG 2006-08-02 20:19:54 -07:00
pci-swiotlb.c [PATCH] x86_64: Fix swiotlb=force 2006-07-29 20:59:55 -07:00
pmtimer.c [PATCH] make pmtmr_ioport __read_mostly 2006-06-26 09:58:21 -07:00
process.c [PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw 2006-09-26 10:52:28 +02:00
ptrace.c [PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw 2006-09-26 10:52:28 +02:00
reboot.c [PATCH] x86_64: Move export symbols to their C functions 2006-06-26 10:48:22 -07:00
relocate_kernel.S [PATCH] kexec: x86_64 kexec implementation 2005-06-25 16:24:50 -07:00
setup.c [PATCH] x86_64: Recover 1MB of kernel memory 2006-08-30 16:05:15 -07:00
setup64.c [PATCH] x86_64: Save original IST values for checking stack addresses 2006-08-30 16:05:16 -07:00
signal.c [PATCH] Add TIF_RESTORE_SIGMASK 2006-09-26 10:52:26 +02:00
smp.c [PATCH] Fix more per-cpu typos 2006-08-06 08:57:47 -07:00
smpboot.c [PATCH] Add initalization of the RDTSCP auxilliary values 2006-09-26 10:52:28 +02:00
stacktrace.c [PATCH] lockdep: stacktrace subsystem, x86_64 support 2006-07-03 15:27:02 -07:00
suspend.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
suspend_asm.S [PATCH] x86_64: Set up safe page tables during resume 2005-10-10 08:36:46 -07:00
sys_x86_64.c [PATCH] x86_64: Use common sys_time64 2005-11-14 19:55:17 -08:00
syscall.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tce.c [PATCH] x86_64: Calgary IOMMU - Multi-Node NULL pointer dereference fix 2006-07-29 20:59:55 -07:00
time.c [PATCH] Add the vgetcpu vsyscall 2006-09-26 10:52:28 +02:00
trampoline.S [PATCH] x86_64: Fix SMP bootup with CONFIG_KDUMP enabled 2006-01-11 19:09:58 -08:00
traps.c [PATCH] Fix up panic messages for different NMI panics 2006-09-26 10:52:27 +02:00
vmlinux.lds.S [PATCH] Add the vgetcpu vsyscall 2006-09-26 10:52:28 +02:00
vsmp.c [PATCH] x86_64: Inclusion of ScaleMP vSMP architecture patches - vsmp_arch 2006-01-11 19:05:01 -08:00
vsyscall.c [PATCH] Add the vgetcpu vsyscall 2006-09-26 10:52:28 +02:00
x8664_ksyms.c [PATCH] x86_64: Move export symbols to their C functions 2006-06-26 10:48:22 -07:00