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
..
arc
ddb5xxx
dec
emma2rh
galileo-boards	[MIPS] Remove EV96100 as previously announced.	2006-09-27 13:37:55 +01:00
ip32
it8172
jmr3927
lasat
mach-atlas	[MIPS] Atlas: update interrupt handling	2006-09-27 13:37:42 +01:00
mach-au1x00	[PATCH] Alchemy: Delete unused pt_regs * argument from au1xxx_dbdma_chan_alloc	2006-09-26 08:48:54 -07:00
mach-cobalt	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-db1x00
mach-dec	[PATCH] char/rtc: Handle memory-mapped chips properly	2006-07-10 13:24:25 -07:00
mach-emma2rh
mach-ev64120
mach-excite	[MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake.	2006-09-27 13:37:57 +01:00
mach-generic	[PATCH] irq-flags: MIPS: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
mach-ip22
mach-ip27	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-ip32
mach-ja	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-jazz	[PATCH] irq-flags: MIPS: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
mach-jmr3927
mach-lasat
mach-mips	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-ocelot
mach-ocelot3	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-pb1x00
mach-pnx8550
mach-qemu	[MIPS] Qemu does not have D-cache aliases	2006-09-27 13:37:49 +01:00
mach-rm200
mach-sibyte	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-sim	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mach-wrppmc
mach-yosemite	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
mips-boards	[MIPS] Atlas: update interrupt handling	2006-09-27 13:37:42 +01:00
pci
sgi
sibyte	[MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake.	2006-09-27 13:37:57 +01:00
sn	[MIPS] Remove BSD and Sys V compat data types.	2006-06-29 21:10:54 +01:00
tx4927
tx4938
vr41xx	[MIPS] vr41xx: Update workpad setup function	2006-07-13 21:26:21 +01:00
xtalk
8253pit.h
a.out.h
abi.h
addrspace.h
apm.h	[MIPS] Don't include obsolete <linux/config.h>.	2006-07-13 21:25:58 +01:00
asm.h
asmmacro-32.h
asmmacro-64.h
asmmacro.h	[MIPS] Fix use of ehb instruction for non-R2 configurations.	2006-06-29 21:10:49 +01:00
atomic.h	[MIPS] TRACE_IRQFLAGS_SUPPORT support.	2006-07-13 21:26:09 +01:00
auxvec.h
bcache.h
bitops.h	[MIPS] TRACE_IRQFLAGS_SUPPORT support.	2006-07-13 21:26:09 +01:00
bootinfo.h	[MIPS] Remove EV96100 as previously announced.	2006-09-27 13:37:55 +01:00
branch.h
break.h
bug.h
bugs.h
byteorder.h
cache.h
cachectl.h
cacheflush.h	[MIPS] Retire flush_icache_page from mm use.	2006-09-27 13:37:34 +01:00
cacheops.h
checksum.h
compat.h
compiler.h
cpu-features.h	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
cpu-info.h
cpu.h	[MIPS] Use the proper technical term for naming some of the cache macros.	2006-07-13 21:26:04 +01:00
cputime.h
current.h
debug.h
delay.h
div64.h
dma-mapping.h
dma.h
ds1286.h
ds1742.h
dsp.h
elf.h
emergency-restart.h
errno.h
fcntl.h	[MIPS] Remove F_SETSIG and F_GETSIG in favor of the asm-generic definitions.	2006-09-27 13:37:48 +01:00
fixmap.h	[MIPS] Fix FIXADDR_TOP for TX39/TX49.	2006-06-29 21:10:52 +01:00
floppy.h
fpregdef.h
fpu_emulator.h
fpu.h
futex.h
gdb-stub.h
gfx.h
gt64120.h
gt64240.h
hardirq.h
hazards.h	[MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake.	2006-09-27 13:37:57 +01:00
highmem.h
hw_irq.h
i8259.h
ide.h
inst.h	[MIPS] Fix rdhwr_op definition.	2006-07-13 21:26:08 +01:00
inventory.h
io.h
ioctl.h
ioctls.h
ipc.h
ipcbuf.h
irq_cpu.h
irq.h	[MIPS] Cleanup leftovers of ARCH_HAS_IRQ_PER_CPU	2006-09-27 13:37:29 +01:00
irqflags.h	[MIPS] TRACE_IRQFLAGS_SUPPORT support.	2006-07-13 21:26:09 +01:00
isadep.h
it8712.h
jazz.h
jazzdma.h
Kbuild	[MIPS] Have headers_install install <asm/cachectl.h> and <asm/sysmips.h>.	2006-09-27 13:37:56 +01:00
kmap_types.h
kspd.h
linkage.h
local.h
m48t35.h
m48t37.h
marvell.h
mc146818-time.h
mc146818rtc.h
mips_mt.h
mipsmtregs.h
mipsprom.h
mipsregs.h	[MIPS] vr41xx: Replace magic number for P4K bit with symbol.	2006-07-13 21:26:11 +01:00
mman.h
mmu_context.h	[MIPS] Reformat missformated SMTC bits.	2006-09-27 13:37:49 +01:00
mmu.h
mmzone.h
module.h
msc01_ic.h
msgbuf.h
mutex.h
namei.h
nile4.h
paccess.h
page.h	[MIPS] Do not lose upper 32-bit on MIPS32 with 64-bit addresses in __pte().	2006-09-27 13:37:39 +01:00
param.h
parport.h
pci.h
percpu.h
pgalloc.h
pgtable-32.h	[PATCH] Standardize pxx_page macros	2006-09-26 08:48:51 -07:00
pgtable-64.h	[MIPS] Fix USER_PTRS_PER_PGD for 64K page size.	2006-09-27 13:37:52 +01:00
pgtable-bits.h
pgtable.h	[PATCH] Standardize pxx_page macros	2006-09-26 08:48:51 -07:00
pmon.h
poll.h
posix_types.h
prctl.h
prefetch.h
processor.h
ptrace.h	[MIPS] Fix errors detected by "make headers_check"	2006-09-27 13:37:40 +01:00
qemu.h
r4kcache.h
reboot.h
reg.h
regdef.h
resource.h
rm9k-ocd.h
rtc.h
rtlx.h
scatterlist.h
sections.h
segment.h
semaphore.h
sembuf.h
serial.h	[MIPS] Remove EV96100 as previously announced.	2006-09-27 13:37:55 +01:00
setup.h
sgialib.h
sgiarcs.h
sgidefs.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	[MIPS] Move definition of IRIX compat constant into IRIX compat code.	2006-09-27 13:37:45 +01:00
sim.h
smp.h
smtc_ipi.h
smtc_proc.h
smtc.h
sni.h
socket.h	[AF_UNIX]: Datagram getpeersec	2006-06-29 16:58:06 -07:00
sockios.h
sparsemem.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
stackframe.h	[MIPS] Fix use of ehb instruction for non-R2 configurations.	2006-06-29 21:10:49 +01:00
stat.h
statfs.h
string.h
suspend.h
sysmips.h
system.h	[PATCH] remove set_wmb - arch removal	2006-07-14 21:56:14 -07:00
termbits.h
termios.h
thread_info.h
time.h	[MIPS] Replace board_timer_setup function pointer by plat_timer_setup.	2006-07-13 21:26:17 +01:00
timex.h	[MIPS] Fix errors detected by "make headers_check"	2006-09-27 13:37:40 +01:00
titan_dep.h
tlb.h
tlbdebug.h
tlbflush.h
topology.h
traps.h
tx3912.h
types.h
uaccess.h
ucontext.h
unaligned.h
unistd.h	[MIPS] fstatat syscall names	2006-09-27 13:37:56 +01:00
user.h	[MIPS] Fix errors detected by "make headers_check"	2006-09-27 13:37:40 +01:00
vga.h
vpe.h
war.h
watch.h
wbflush.h
xor.h
xxs1500.h