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	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
asmregs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
assembly.h	[PARISC] Ensure all ldcw uses are ldcw,co on pa2.0	2006-06-27 23:28:32 +00:00
atomic.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
auxvec.h	[PATCH] auxiliary vector cleanups	2005-09-07 16:57:21 -07:00
bitops.h	[PATCH] bitops: parisc: use generic bitops	2006-03-26 08:57:14 -08:00
bug.h	[PATCH] remove all kernel BUGs	2005-05-01 08:59:01 -07:00
bugs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
byteorder.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
cache.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
cacheflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
checksum.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
compat.h	[PARISC] Add is_compat_task() helper	2006-06-27 23:28:40 +00:00
compat_rt_sigframe.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
compat_signal.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
compat_ucontext.h	[PARISC] Arch-specific compat signals	2006-01-22 20:57:42 -05:00
cputime.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
current.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
delay.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
div64.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
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
eisa_bus.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
eisa_eeprom.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
elf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
emergency-restart.h	[PATCH] Add emergency_restart()	2005-07-26 14:35:41 -07:00
errno.h	[PARISC] Add ECANCELED to errno.h	2005-10-21 22:53:43 -04:00
fcntl.h	[PATCH] Clean up struct flock64 definitions	2005-09-07 16:57:38 -07:00
fixmap.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
floppy.h	[PATCH] irq-flags: PARISC: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
futex.h	[PATCH] consolidate asm/futex.h	2006-01-08 20:13:39 -08:00
grfioctl.h	[PARISC] Use kzalloc and other janitor-style cleanups	2006-01-22 20:26:31 -05:00
hardirq.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
hardware.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
hw_irq.h	[PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend()	2006-06-29 10:26:23 -07:00
ide.h	[PATCH] remove some more check_region stuff	2005-10-30 17:37:18 -08:00
io.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
ioctl.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
ioctls.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
iosapic.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
ipcbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
irq.h	[PATCH] genirq: cleanup: turn ARCH_HAS_IRQ_PER_CPU into CONFIG_IRQ_PER_CPU	2006-06-29 10:26:23 -07:00
Kbuild	Add empty Kbuild files for 'make headers_install' in remaining arches.	2006-06-18 12:58:53 +01:00
kmap_types.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
led.h	[PARISC] Use work queue in LED/LCD driver instead of tasklet.	2005-10-21 22:46:18 -04:00
linkage.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
local.h	[PARISC] Make local_t use atomic_long_t	2006-03-30 17:48:56 +00:00
machdep.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mc146818rtc.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mman.h	[PATCH] add asm-generic/mman.h	2006-02-15 15:32:22 -08:00
mmu.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mmu_context.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mmzone.h	[PATCH] Delete unused definitions of kvaddr_to_nid	2006-06-23 07:42:52 -07:00
module.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
msgbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mutex.h	[PATCH] mutex subsystem, add default include/asm-*/mutex.h files	2006-01-09 15:59:19 -08:00
namei.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
page.h	[PATCH] headers_check: Clean up asm-parisc/page.h for user headers	2006-09-19 07:59:59 -07:00
param.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
parisc-device.h	[PARISC] Convert parisc_device to use struct resource for hpa	2005-10-21 22:36:40 -04:00
parport.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pci.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
pdc.h	[PARISC] Move os_id_to_string() inside #ifndef __ASSEMBLY__	2006-06-27 23:28:45 +00:00
pdc_chassis.h	[PARISC] Clarify pdc_stable license terms	2006-03-30 17:48:41 +00:00
pdcpat.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
percpu.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
perf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pgalloc.h	[PARISC] Drop unused do_check_pgt_cache()	2006-01-22 20:26:37 -05:00
pgtable.h	[PATCH] Standardize pxx_page macros	2006-09-26 08:48:51 -07:00
poll.h	[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications	2006-03-25 08:22:56 -08:00
posix_types.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
processor.h	[PARISC] Use MFIA in current_text_addr on pa2.0 processors	2006-06-27 23:28:36 +00:00
psw.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
ptrace.h	[PARISC] Take into account nullified insn and lock functions for profiling	2005-10-21 22:42:18 -04:00
real.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
resource.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
rt_sigframe.h	[PARISC] Arch-specific compat signals	2006-01-22 20:57:42 -05:00
rtc.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
runway.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
scatterlist.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
sections.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
segment.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
semaphore-helper.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
semaphore.h	[PATCH] semaphore: Remove __MUTEX_INITIALIZER()	2005-10-30 17:37:27 -08:00
sembuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
serial.h	[PATCH] Serial: Split 8250 port table (part 2)	2005-06-29 18:45:19 +01:00
setup.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
shmbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
shmparam.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
sigcontext.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
siginfo.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
signal.h	[PATCH] irq-flags: PARISC: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
smp.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
socket.h	[AF_UNIX]: Datagram getpeersec	2006-06-29 16:58:06 -07:00
sockios.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	2006-10-01 00:39:21 -07:00
spinlock_types.h	[PARISC] Update spinlocks from parisc tree	2005-10-21 22:41:25 -04:00
stat.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
statfs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
string.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
superio.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
system.h	[PATCH] remove set_wmb - arch removal	2006-07-14 21:56:14 -07:00
termbits.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
termios.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
thread_info.h	[PARISC] Add PREEMPT support	2006-03-30 17:48:54 +00:00
timex.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
tlb.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
tlbflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
topology.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
traps.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
types.h	[PARISC] Update bitops from parisc tree	2005-10-21 22:45:22 -04:00
uaccess.h	[PARISC] Use FIXUP_BRANCH_CLOBBER to asm clobber list	2006-06-27 23:28:33 +00:00
ucontext.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
unaligned.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
unistd.h	[PARISC] Remove unconditional #define PIC in syscall macros	2006-06-27 23:28:36 +00:00
unwind.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
user.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
xor.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00