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>		2006-10-01 00:39:21 -07:00
..
a.out.h
apc.h
asi.h
asmmacro.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
atomic.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
auxio.h
auxvec.h
bitext.h
bitops.h	[PATCH] bitops: sparc: use generic bitops	2006-03-26 08:57:14 -08:00
bpp.h
bsderrno.h
btfixup.h
bug.h
bugs.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
byteorder.h
cache.h
cacheflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
checksum.h
clock.h
contregs.h
cpudata.h	[SPARC]: Try to start getting SMP back into shape.	2006-03-23 22:36:19 -08:00
cputime.h
current.h
cypress.h
delay.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
div64.h
dma-mapping.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
dma.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
ebus.h	[SPARC]: Port of_device layer and make ebus use it.	2006-06-23 23:15:47 -07:00
ecc.h
eeprom.h
elf.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
emergency-restart.h
errno.h
fbio.h
fcntl.h
fixmap.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
floppy.h	[PATCH] irq-flags: SPARC: Use the new IRQF_ constants	2006-07-02 13:58:48 -07:00
futex.h	[PATCH] consolidate asm/futex.h	2006-01-08 20:13:39 -08:00
hardirq.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
head.h
highmem.h
hw_irq.h
ide.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
idprom.h	[SPARC]: Clean up idprom header files.	2006-03-20 01:12:08 -08:00
io-unit.h
io.h	[SPARC]: Add iomap interfaces.	2006-06-25 23:24:24 -07:00
ioctl.h
ioctls.h
iommu.h
ipc.h
ipcbuf.h
irq.h	[PATCH] adjust handle_IRR_event() return type	2006-06-23 07:43:08 -07:00
jsflash.h
Kbuild	Fix exported headers for SPARC, SPARC64	2006-09-21 08:48:27 +01:00
kdebug.h
kgdb.h
kmap_types.h
linkage.h
local.h
machines.h
mbus.h
mc146818rtc.h
memreg.h
mman.h	[PATCH] IA64,sparc: local DoS with corrupted ELFs	2006-09-08 08:40:46 -07:00
mmu_context.h
mmu.h
module.h
mostek.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
mpmbox.h
msgbuf.h
msi.h
mutex.h	[PATCH] mutex subsystem, add default include/asm-*/mutex.h files	2006-01-09 15:59:19 -08:00
mxcc.h
namei.h
obio.h
of_device.h	[SPARC]: sparc32 side of of_device layer IRQ resolution.	2006-06-29 16:37:40 -07:00
openprom.h
openpromio.h
oplib.h	[SPARC]: Kill prom_getname, unused and not implemented properly.	2006-07-21 14:17:55 -07:00
page.h	Fix exported headers for SPARC, SPARC64	2006-09-21 08:48:27 +01:00
param.h
pbm.h	[SPARC]: Port sparc64 in-kernel device tree code to sparc32.	2006-06-23 23:15:45 -07:00
pci.h
pcic.h
pconf.h
percpu.h
perfctr.h
pgalloc.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
pgtable.h	[PATCH] Standardize pxx_page macros	2006-09-26 08:48:51 -07:00
pgtsrmmu.h
pgtsun4.h
pgtsun4c.h
poll.h	[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications	2006-03-25 08:22:56 -08:00
posix_types.h
processor.h
prom.h	[SPARC]: Kill interrupt stuff and linux_phandle from device_node.	2006-06-29 16:37:25 -07:00
psr.h
ptrace.h
reg.h
resource.h
ross.h
rtc.h
sbi.h
sbus.h	[SBUS]: Rewrite and plug into of_device framework.	2006-06-23 23:15:50 -07:00
scatterlist.h
sections.h
semaphore.h
sembuf.h
setup.h
sfp-machine.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	[SPARC]: Fix SA_STATIC_ALLOC value.	2006-07-24 22:34:00 -07:00
smp.h	Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6	2006-06-20 17:39:28 -07:00
smpprim.h
socket.h	[AF_UNIX]: Datagram getpeersec	2006-06-29 16:58:06 -07:00
sockios.h
solerrno.h
spinlock_types.h
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	2006-10-01 00:39:21 -07:00
stat.h
statfs.h
string.h
sun4paddr.h
sun4prom.h
sunbpp.h
svr4.h
swift.h
sysen.h
system.h	[PATCH] remove set_wmb - arch removal	2006-07-14 21:56:14 -07:00
termbits.h
termios.h
thread_info.h	[SPARC]: Add support for *at(), ppoll, and pselect syscalls.	2006-01-19 02:42:49 -08:00
timer.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
timex.h
tlb.h
tlbflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
topology.h
traps.h
tsunami.h
turbosparc.h
types.h
uaccess.h	[SPARC]: Kill off these __put_user_ret things.	2006-03-20 01:13:15 -08:00
unaligned.h
unistd.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2006-05-24 09:22:21 +01:00
user.h
vac-ops.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
vaddrs.h
vfc_ioctls.h
vga.h	[PATCH] sparc32 vga support	2006-04-11 06:18:54 -07:00
viking.h
winmacro.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
xor.h