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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
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Kbuild	Fix exported headers for SPARC, SPARC64	19 years ago
a.out.h	Linux-2.6.12-rc2	20 years ago
apc.h	Linux-2.6.12-rc2	20 years ago
asi.h	Linux-2.6.12-rc2	20 years ago
asmmacro.h	Don't include linux/config.h from anywhere else in include/	19 years ago
atomic.h	Don't include linux/config.h from anywhere else in include/	19 years ago
auxio.h	Linux-2.6.12-rc2	20 years ago
auxvec.h	[PATCH] auxiliary vector cleanups	20 years ago
bitext.h	Linux-2.6.12-rc2	20 years ago
bitops.h	[PATCH] bitops: sparc: use generic bitops	19 years ago
bpp.h	Linux-2.6.12-rc2	20 years ago
bsderrno.h	Linux-2.6.12-rc2	20 years ago
btfixup.h	[PATCH] fix the breakage in sparc headers	20 years ago
bug.h	[PATCH] remove all kernel BUGs	20 years ago
bugs.h	Don't include linux/config.h from anywhere else in include/	19 years ago
byteorder.h	Linux-2.6.12-rc2	20 years ago
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	19 years ago
cacheflush.h	Don't include linux/config.h from anywhere else in include/	19 years ago
checksum.h	Linux-2.6.12-rc2	20 years ago
clock.h	Linux-2.6.12-rc2	20 years ago
contregs.h	Linux-2.6.12-rc2	20 years ago
cpudata.h	[SPARC]: Try to start getting SMP back into shape.	19 years ago
cputime.h	Linux-2.6.12-rc2	20 years ago
current.h	Linux-2.6.12-rc2	20 years ago
cypress.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
delay.h	Don't include linux/config.h from anywhere else in include/	19 years ago
div64.h	Linux-2.6.12-rc2	20 years ago
dma-mapping.h	Don't include linux/config.h from anywhere else in include/	19 years ago
dma.h	Don't include linux/config.h from anywhere else in include/	19 years ago
ebus.h	[SPARC]: Port of_device layer and make ebus use it.	19 years ago
ecc.h	Linux-2.6.12-rc2	20 years ago
eeprom.h	Linux-2.6.12-rc2	20 years ago
elf.h	Don't include linux/config.h from anywhere else in include/	19 years ago
emergency-restart.h	[PATCH] Add emergency_restart()	20 years ago
errno.h	[PATCH] add EOWNERDEAD and ENOTRECOVERABLE version 2	20 years ago
fbio.h	Linux-2.6.12-rc2	20 years ago
fcntl.h	[PATCH] Clean up struct flock64 definitions	20 years ago
fixmap.h	Don't include linux/config.h from anywhere else in include/	19 years ago
floppy.h	[PATCH] irq-flags: SPARC: Use the new IRQF_ constants	19 years ago
futex.h	[PATCH] consolidate asm/futex.h	19 years ago
hardirq.h	Don't include linux/config.h from anywhere else in include/	19 years ago
head.h	Linux-2.6.12-rc2	20 years ago
highmem.h	Linux-2.6.12-rc2	20 years ago
hw_irq.h	Linux-2.6.12-rc2	20 years ago
ide.h	Don't include linux/config.h from anywhere else in include/	19 years ago
idprom.h	[SPARC]: Clean up idprom header files.	19 years ago
io-unit.h	Linux-2.6.12-rc2	20 years ago
io.h	[SPARC]: Add iomap interfaces.	19 years ago
ioctl.h	Linux-2.6.12-rc2	20 years ago
ioctls.h	Linux-2.6.12-rc2	20 years ago
iommu.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
ipc.h	Linux-2.6.12-rc2	20 years ago
ipcbuf.h	Linux-2.6.12-rc2	20 years ago
irq.h	[PATCH] adjust handle_IRR_event() return type	19 years ago
jsflash.h	Linux-2.6.12-rc2	20 years ago
kdebug.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
kgdb.h	Linux-2.6.12-rc2	20 years ago
kmap_types.h	Linux-2.6.12-rc2	20 years ago
linkage.h	Linux-2.6.12-rc2	20 years ago
local.h	Linux-2.6.12-rc2	20 years ago
machines.h	Linux-2.6.12-rc2	20 years ago
mbus.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
mc146818rtc.h	Linux-2.6.12-rc2	20 years ago
memreg.h	[PATCH] sun4c_memerr_reg __iomem annotations	19 years ago
mman.h	[PATCH] IA64,sparc: local DoS with corrupted ELFs	19 years ago
mmu.h	Linux-2.6.12-rc2	20 years ago
mmu_context.h	Linux-2.6.12-rc2	20 years ago
module.h	Linux-2.6.12-rc2	20 years ago
mostek.h	Don't include linux/config.h from anywhere else in include/	19 years ago
mpmbox.h	Linux-2.6.12-rc2	20 years ago
msgbuf.h	Linux-2.6.12-rc2	20 years ago
msi.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
mutex.h	[PATCH] mutex subsystem, add default include/asm-*/mutex.h files	19 years ago
mxcc.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
namei.h	Linux-2.6.12-rc2	20 years ago
obio.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
of_device.h	[SPARC]: sparc32 side of of_device layer IRQ resolution.	19 years ago
openprom.h	Linux-2.6.12-rc2	20 years ago
openpromio.h	Linux-2.6.12-rc2	20 years ago
oplib.h	[SPARC]: Kill prom_getname, unused and not implemented properly.	19 years ago
page.h	Fix exported headers for SPARC, SPARC64	19 years ago
param.h	Linux-2.6.12-rc2	20 years ago
pbm.h	[SPARC]: Port sparc64 in-kernel device tree code to sparc32.	19 years ago
pci.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
pcic.h	[PATCH] fix iomem annotations in sparc32 pcic code	19 years ago
pconf.h	Linux-2.6.12-rc2	20 years ago
percpu.h	Linux-2.6.12-rc2	20 years ago
perfctr.h	Linux-2.6.12-rc2	20 years ago
pgalloc.h	Don't include linux/config.h from anywhere else in include/	19 years ago
pgtable.h	[PATCH] Standardize pxx_page macros	19 years ago
pgtsrmmu.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
pgtsun4.h	Linux-2.6.12-rc2	20 years ago
pgtsun4c.h	Linux-2.6.12-rc2	20 years ago
poll.h	[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications	19 years ago
posix_types.h	Linux-2.6.12-rc2	20 years ago
processor.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
prom.h	[SPARC]: Kill interrupt stuff and linux_phandle from device_node.	19 years ago
psr.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
ptrace.h	[PATCH] consolidate sys_ptrace()	19 years ago
reg.h	Linux-2.6.12-rc2	20 years ago
resource.h	Linux-2.6.12-rc2	20 years ago
ross.h	Linux-2.6.12-rc2	20 years ago
rtc.h	Linux-2.6.12-rc2	20 years ago
sbi.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
sbus.h	[SBUS]: Rewrite and plug into of_device framework.	19 years ago
scatterlist.h	Linux-2.6.12-rc2	20 years ago
sections.h	Linux-2.6.12-rc2	20 years ago
semaphore.h	[PATCH] semaphore: Remove __MUTEX_INITIALIZER()	19 years ago
sembuf.h	Linux-2.6.12-rc2	20 years ago
setup.h	Linux-2.6.12-rc2	20 years ago
sfp-machine.h	Don't include linux/config.h from anywhere else in include/	19 years ago
shmbuf.h	Linux-2.6.12-rc2	20 years ago
shmparam.h	Linux-2.6.12-rc2	20 years ago
sigcontext.h	Linux-2.6.12-rc2	20 years ago
siginfo.h	Linux-2.6.12-rc2	20 years ago
signal.h	[SPARC]: Fix SA_STATIC_ALLOC value.	19 years ago
smp.h	Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6	19 years ago
smpprim.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
socket.h	[AF_UNIX]: Datagram getpeersec	19 years ago
sockios.h	Linux-2.6.12-rc2	20 years ago
solerrno.h	Linux-2.6.12-rc2	20 years ago
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	19 years ago
spinlock_types.h	[PATCH] spinlock consolidation	20 years ago
stat.h	Linux-2.6.12-rc2	20 years ago
statfs.h	Linux-2.6.12-rc2	20 years ago
string.h	Linux-2.6.12-rc2	20 years ago
sun4paddr.h	Linux-2.6.12-rc2	20 years ago
sun4prom.h	Linux-2.6.12-rc2	20 years ago
sunbpp.h	Linux-2.6.12-rc2	20 years ago
svr4.h	Linux-2.6.12-rc2	20 years ago
swift.h	Linux-2.6.12-rc2	20 years ago
sysen.h	Linux-2.6.12-rc2	20 years ago
system.h	[PATCH] remove set_wmb - arch removal	19 years ago
termbits.h	Linux-2.6.12-rc2	20 years ago
termios.h	[SPARC]: remove duplicate TIOCPKT_ definitions	19 years ago
thread_info.h	[SPARC]: Add support for *at(), ppoll, and pselect syscalls.	19 years ago
timer.h	Don't include linux/config.h from anywhere else in include/	19 years ago
timex.h	Linux-2.6.12-rc2	20 years ago
tlb.h	Linux-2.6.12-rc2	20 years ago
tlbflush.h	Don't include linux/config.h from anywhere else in include/	19 years ago
topology.h	Linux-2.6.12-rc2	20 years ago
traps.h	[SPARC]: "extern inline" doesn't make much sense.	20 years ago
tsunami.h	Linux-2.6.12-rc2	20 years ago
turbosparc.h	Linux-2.6.12-rc2	20 years ago
types.h	[PATCH] sab: consolidate kmem_bufctl_t	20 years ago
uaccess.h	[SPARC]: Kill off these __put_user_ret things.	19 years ago
unaligned.h	Linux-2.6.12-rc2	20 years ago
unistd.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	19 years ago
user.h	Linux-2.6.12-rc2	20 years ago
vac-ops.h	Don't include linux/config.h from anywhere else in include/	19 years ago
vaddrs.h	Linux-2.6.12-rc2	20 years ago
vfc_ioctls.h	Linux-2.6.12-rc2	20 years ago
vga.h	[PATCH] sparc32 vga support	19 years ago
viking.h	Linux-2.6.12-rc2	20 years ago
winmacro.h	Don't include linux/config.h from anywhere else in include/	19 years ago
xor.h	Linux-2.6.12-rc2	20 years ago