You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Martin Schwidefsky ef6edc9746 [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks ... On systems running with virtual cpus there is optimization potential in regard to spinlocks and rw-locks. If the virtual cpu that has taken a lock is known to a cpu that wants to acquire the same lock it is beneficial to yield the timeslice of the virtual cpu in favour of the cpu that has the lock (directed yield). With CONFIG_PREEMPT="n" this can be implemented by the architecture without common code changes. Powerpc already does this. With CONFIG_PREEMPT="y" the lock loops are coded with _raw_spin_trylock, _raw_read_trylock and _raw_write_trylock in kernel/spinlock.c. If the lock could not be taken cpu_relax is called. A directed yield is not possible because cpu_relax doesn't know anything about the lock. To be able to yield the lock in favour of the current lock holder variants of cpu_relax for spinlocks and rw-locks are needed. The new _raw_spin_relax, _raw_read_relax and _raw_write_relax primitives differ from cpu_relax insofar that they have an argument: a pointer to the lock structure. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
..
arch-aaec2000	…
arch-at91rm9200	[ARM] 3870/1: AT91: Start removing static memory mappings	19 years ago
arch-cl7500	…
arch-clps711x	[PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem)	19 years ago
arch-ebsa110	…
arch-ebsa285	…
arch-ep93xx	[PATCH] Cirrus Logic ep93xx ethernet driver	19 years ago
arch-h720x	[ARM] 3660/1: Remove legacy defines	19 years ago
arch-imx	[ARM] 3660/1: Remove legacy defines	19 years ago
arch-integrator	…
arch-iop32x	[ARM] 3851/1: iop3xx: add io-data glantank support	19 years ago
arch-iop33x	[ARM] 3832/1: iop3xx: coding style cleanup	19 years ago
arch-ixp4xx	[ARM] 3856/1: Add clocksource for Intel IXP4xx platforms	19 years ago
arch-ixp23xx	[ARM] 3662/1: ixp23xx: don't include asm/hardware.h in uncompress.h	19 years ago
arch-ixp2000	…
arch-l7200	[PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem)	19 years ago
arch-lh7a40x	…
arch-netx	…
arch-omap	[PATCH] OMAP: Add keypad driver	19 years ago
arch-pnx4008	…
arch-pxa	USB: pxa2xx_udc understands GPIO based VBUS sensing	19 years ago
arch-realview	…
arch-rpc	…
arch-s3c2410	[ARM] 3846/1: S3C24XX: Fix osiris memory map	19 years ago
arch-sa1100	…
arch-shark	…
arch-versatile	[ARM] Allow Versatile to be built for AB and PB	19 years ago
hardware	[ARM] 3864/1: Refactore sharpsl_pm	19 years ago
mach	[ARM] 3855/1: Add generic time support	19 years ago
Kbuild	…
a.out.h	…
apm.h	…
assembler.h	…
atomic.h	[ARM] 3810/1: switch atomic helpers over to raw_local_irq_{save,restore}	19 years ago
auxvec.h	…
bitops.h	[ARM] 3852/1: convert atomic bitops and __xchg over to raw_local_irq_{save,restore}	19 years ago
bug.h	Remove obsolete #include <linux/config.h>	19 years ago
bugs.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
byteorder.h	…
cache.h	…
cacheflush.h	[ARM] Use CPU_CACHE_* where possible in asm/cacheflush.h	19 years ago
checksum.h	…
cpu-multi32.h	…
cpu-single.h	…
cpu.h	…
cputime.h	…
current.h	…
delay.h	…
div64.h	…
dma-mapping.h	…
dma.h	…
domain.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
dyntick.h	[ARM] 3692/1: ARM: coswitch irq handling to the generic implementation	19 years ago
ecard.h	…
elf.h	[HEADERS] Fix ARM 'make headers_check'	19 years ago
emergency-restart.h	…
errno.h	…
fcntl.h	…
fiq.h	…
flat.h	[ARM] nommu: create flat.h to support uClinux flat binaries	19 years ago
floppy.h	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
fpstate.h	[ARM] 3370/2: ep93xx: add crunch support	19 years ago
futex.h	…
glue.h	…
hardirq.h	…
hardware.h	…
hw_irq.h	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
ide.h	…
io.h	[ARM] 3813/1: prevent >= 4G /dev/mem mmap()	19 years ago
ioctl.h	…
ioctls.h	…
ipc.h	…
ipcbuf.h	…
irq.h	[ARM] 3692/1: ARM: coswitch irq handling to the generic implementation	19 years ago
irqflags.h	[ARM] Add ARM irqtrace support	19 years ago
kmap_types.h	…
leds.h	…
limits.h	…
linkage.h	…
local.h	…
locks.h	…
mc146818rtc.h	…
memory.h	[ARM] 3705/1: add supersection support to ioremap()	19 years ago
mman.h	…
mmu.h	[ARM] Add section support to ioremap	19 years ago
mmu_context.h	[ARM] Add section support to ioremap	19 years ago
mmzone.h	…
module.h	…
msgbuf.h	…
mtd-xip.h	…
mutex.h	…
namei.h	…
nwflash.h	…
page-nommu.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
page.h	Merge master.kernel.org:/pub/scm/linux/kernel/git/tmlind/linux-omap-upstream into devel	19 years ago
param.h	…
parport.h	…
pci.h	…
percpu.h	…
pgalloc.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
pgtable-hwdef.h	[ARM] Set bit 4 on section mappings correctly depending on CPU	19 years ago
pgtable-nommu.h	[ARM] nommu: adjust headers for !MMU ARM systems	19 years ago
pgtable.h	Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm	19 years ago
poll.h	…
posix_types.h	…
proc-fns.h	[ARM] nommu: add ARM946E-S core support	19 years ago
processor.h	…
procinfo.h	[ARM] 3756/1: Assign value for HWCAP_IWMMXT	19 years ago
ptrace.h	[ARM] 3665/1: crunch: add ptrace support	19 years ago
resource.h	…
rtc.h	…
scatterlist.h	…
sections.h	…
segment.h	…
semaphore-helper.h	…
semaphore.h	…
sembuf.h	…
serial.h	…
setup.h	[ARM] Separate page table manipulation code from bootmem initialisation	19 years ago
shmbuf.h	…
shmparam.h	…
sigcontext.h	…
siginfo.h	…
signal.h	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
sizes.h	…
smp.h	…
socket.h	[AF_UNIX]: Datagram getpeersec	19 years ago
sockios.h	…
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	19 years ago
spinlock_types.h	…
stat.h	…
statfs.h	…
string.h	…
suspend.h	…
system.h	[ARM] nommu: manage the CP15 things	19 years ago
termbits.h	…
termios.h	…
therm.h	…
thread_info.h	Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm	19 years ago
thread_notify.h	…
timeofday.h	[ARM] 3855/1: Add generic time support	19 years ago
timex.h	…
tlb.h	…
tlbflush.h	[ARM] 3759/2: Remove uses of %?	19 years ago
topology.h	…
traps.h	…
types.h	…
uaccess.h	[ARM] nommu: uaccess tweaks	19 years ago
ucontext.h	[ARM] 3664/1: crunch: add signal frame save/restore	19 years ago
unaligned.h	[ARM] 3849/1: fix get_unaligned() for gcc >= 4.1	19 years ago
unistd.h	[PATCH] consistently use MAX_ERRNO in __syscall_return	19 years ago
user.h	…
vfp.h	…
vfpmacros.h	…
vga.h	…
xor.h	…