kernel_samsung_sm7125

jenna

History

Nick Piggin 64c7c8f885 [PATCH] sched: resched and cpu_idle rework Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce confusion, and make their semantics rigid. Improves efficiency of resched_task and some cpu_idle routines. * In resched_task: - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held, and as we hold it during resched_task, then there is no need for an atomic test and set there. The only other time this should be set is when the task's quantum expires, in the timer interrupt - this is protected against because the rq lock is irq-safe. - If TIF_NEED_RESCHED is set, then we don't need to do anything. It won't get unset until the task get's schedule()d off. - If we are running on the same CPU as the task we resched, then set TIF_NEED_RESCHED and no further action is required. - If we are running on another CPU, and TIF_POLLING_NRFLAG is not set after TIF_NEED_RESCHED has been set, then we need to send an IPI. Using these rules, we are able to remove the test and set operation in resched_task, and make clear the previously vague semantics of POLLING_NRFLAG. * In idle routines: - Enter cpu_idle with preempt disabled. When the need_resched() condition becomes true, explicitly call schedule(). This makes things a bit clearer (IMO), but haven't updated all architectures yet. - Many do a test and clear of TIF_NEED_RESCHED for some reason. According to the resched_task rules, this isn't needed (and actually breaks the assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock held). So remove that. Generally one less locked memory op when switching to the idle thread. - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner most polling idle loops. The above resched_task semantics allow it to be set until before the last time need_resched() is checked before going into a halt requiring interrupt wakeup. Many idle routines simply never enter such a halt, and so POLLING_NRFLAG can be always left set, completely eliminating resched IPIs when rescheduling the idle task. POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Con Kolivas <kernel@kolivas.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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DocBook	…
RCU	[PATCH] Remove hlist_for_each_rcu() API, convert existing use to hlist_for_each_entry_rcu	19 years ago
aoe	…
arm	[ARM] Documentation/arm/README: small update	19 years ago
block	…
cdrom	…
connector	…
cpu-freq	…
cris	…
crypto	…
device-mapper	…
driver-model	…
dvb	[PATCH] dvb: documentation updates for hybrid v4l/dvb cards	19 years ago
early-userspace	…
fb	…
filesystems	[PATCH] remove CONFIG_EXT{2,3}_CHECK	19 years ago
firmware_class	[PATCH] fix missing includes	19 years ago
fujitsu/frv	…
hwmon	…
i2c	…
i2o	…
i386	…
ia64	…
infiniband	…
input	…
ioctl	…
isdn	…
kbuild	…
kdump	[PATCH] More documentation, minor cleanup in kdump.txt	20 years ago
m68k	[PATCH] mm: m68k kill stram swap	19 years ago
mips	…
networking	…
parisc	…
pcmcia	…
power	…
powerpc	…
s390	…
scsi	…
serial	…
sh	…
sound	…
sparc	…
sysctl	…
telephony	…
uml	…
usb	…
video4linux	…
vm	…
w1	…
watchdog	…
x86_64	…
00-INDEX	…
BUG-HUNTING	Linux-2.6.12-rc2	20 years ago
Changes	…
CodingStyle	…
DMA-API.txt	…
DMA-ISA-LPC.txt	…
DMA-mapping.txt	…
IO-mapping.txt	…
IPMI.txt	…
IRQ-affinity.txt	…
MSI-HOWTO.txt	…
ManagementStyle	…
PCIEBUS-HOWTO.txt	…
README.DAC960	Linux-2.6.12-rc2	20 years ago
README.cycladesZ	Linux-2.6.12-rc2	20 years ago
SAK.txt	…
SecurityBugs	…
SubmittingDrivers	…
SubmittingPatches	…
VGA-softcursor.txt	Linux-2.6.12-rc2	20 years ago
acpi-hotkey.txt	…
applying-patches.txt	…
atomic_ops.txt	…
basic_profiling.txt	…
binfmt_misc.txt	…
cachetlb.txt	…
cciss.txt	…
cli-sti-removal.txt	…
computone.txt	…
cpqarray.txt	…
cpusets.txt	…
dcdbas.txt	[PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs support	20 years ago
debugging-modules.txt	…
dell_rbu.txt	…
devices.txt	[PATCH] kdump: Accessing dump file in linear raw format (/dev/oldmem)	20 years ago
digiepca.txt	…
dnotify.txt	…
dontdiff	[PATCH] dontdiff: add asm_offsets	20 years ago
eisa.txt	…
exception.txt	[PATCH] remove verify_area(): remove or edit references to verify_area in Documentation/	20 years ago
feature-removal-schedule.txt	…
floppy.txt	…
ftape.txt	…
hayes-esp.txt	…
highuid.txt	…
hpet.txt	[PATCH] Doc/hpet.txt: change to < 80 columns	19 years ago
hw_random.txt	…
ibm-acpi.txt	[ACPI] IBM ThinkPad ACPI Extras Driver v0.12	20 years ago
ide.txt	Linux-2.6.12-rc2	20 years ago
initrd.txt	…
io_ordering.txt	…
ioctl-number.txt	…
iostats.txt	Linux-2.6.12-rc2	20 years ago
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	Linux-2.6.12-rc2	20 years ago
kernel-docs.txt	Linux-2.6.12-rc2	20 years ago
kernel-parameters.txt	…
keys-request-key.txt	[PATCH] Keys: Add request-key process documentation	20 years ago
keys.txt	…
kobject.txt	…
kprobes.txt	…
kref.txt	…
laptop-mode.txt	…
ldm.txt	…
locks.txt	…
logo.gif	…
logo.txt	…
magic-number.txt	…
mandatory.txt	…
mca.txt	…
md.txt	…
memory.txt	…
mono.txt	[PATCH] merge some from Rusty's trivial patches	20 years ago
moxa-smartio	…
mtrr.txt	…
nbd.txt	…
nfsroot.txt	…
nmi_watchdog.txt	Linux-2.6.12-rc2	20 years ago
nommu-mmap.txt	…
numastat.txt	…
oops-tracing.txt	…
paride.txt	Linux-2.6.12-rc2	20 years ago
parport-lowlevel.txt	…
parport.txt	…
pci.txt	[PATCH] merge some from Rusty's trivial patches	20 years ago
pm.txt	…
pnp.txt	…
preempt-locking.txt	…
prio_tree.txt	…
ramdisk.txt	…
riscom8.txt	…
rocket.txt	Linux-2.6.12-rc2	20 years ago
rpc-cache.txt	…
rtc.txt	…
sched-arch.txt	[PATCH] sched: resched and cpu_idle rework	19 years ago
sched-coding.txt	…
sched-design.txt	…
sched-domains.txt	…
sched-stats.txt	…
seclvl.txt	…
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
sharedsubtree.txt	…
smart-config.txt	…
smp.txt	…
sonypi.txt	…
sparse.txt	…
specialix.txt	…
spinlocks.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	…
stallion.txt	…
svga.txt	…
sx.txt	…
sysrq.txt	…
time_interpolators.txt	…
tipar.txt	…
tty.txt	…
unicode.txt	…
voyager.txt	…
xterm-linux.xpm	…
zorro.txt	…

README.cycladesZ


The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/