kernel_optimize_test/arch/i386
john stultz 3f4a0b917c [PATCH] i386 Time: Avoid PIT SMP lockups
Avoid possible PIT livelock issues seen on SMP systems (and reported by
Andi), by not allowing it as a clocksource on SMP boxes.

However, since the PIT may no longer be present, we have to properly handle
the cases where SMP systems have TSC skew and fall back from the TSC.
Since the PIT isn't there, it would "fall back" to the TSC again.  So this
changes the jiffies rating to 1, and the TSC-bad rating value to 0.

Thus you will get the following behavior priority on i386 systems:

tsc		[if present & stable]
hpet		[if present]
cyclone		[if present]
acpi_pm		[if present]
pit		[if UP]
jiffies

Rather then the current more complicated:
tsc		[if present & stable]
hpet		[if present]
cyclone		[if present]
acpi_pm		[if present]
pit		[if cpus < 4]
tsc		[if present & unstable]
jiffies

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-17 08:18:42 -07:00
..
boot [PATCH] Some config.h removals 2006-10-01 00:39:34 -07:00
crypto
kernel [PATCH] i386 Time: Avoid PIT SMP lockups 2006-10-17 08:18:42 -07:00
lib [PATCH] kernel-doc: fix function name in usercopy.c 2006-10-11 11:14:24 -07:00
mach-default
mach-es7000
mach-generic
mach-visws IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mach-voyager [VOYAGER] fix up ptregs removal mess 2006-10-12 22:25:03 -05:00
math-emu
mm [PATCH] mm: use symbolic names instead of indices for zone initialisation 2006-10-11 11:14:14 -07:00
oprofile [PATCH] oprofile: ppro: need to enable/disable all the counters 2006-09-29 09:18:11 -07:00
pci [PATCH] i386/x86_64: FIX pci_enable_irq to set dev->irq to the irq number 2006-10-08 12:24:02 -07:00
power
defconfig [PATCH] i386: Update defconfig 2006-10-05 18:47:21 +02:00
Kconfig Attack of "the the"s in arch 2006-10-03 22:21:02 +02:00
Kconfig.cpu [PATCH] uml: fix processor selection to exclude unsupported processors and features 2006-10-11 11:14:20 -07:00
Kconfig.debug
Makefile
Makefile.cpu