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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>
 		2006-10-01 00:39:21 -07:00
..
arch-v10 Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
arch-v32 [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
Kbuild Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
a.out.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
atomic.h [PATCH] mutex subsystem, add atomic_xchg() to all arches 2006-01-09 15:59:17 -08:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
axisflashmap.h [PATCH] CRIS update: misc patches 2005-07-27 16:26:00 -07:00
bitops.h [PATCH] bitops: cris: use generic bitops 2006-03-26 08:57:12 -08:00
bug.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
bugs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
byteorder.h Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
cache.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cacheflush.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
checksum.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
cputime.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
current.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
delay.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
div64.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-mapping.h [PATCH] Kill L1_CACHE_SHIFT_MAX 2006-01-08 20:13:39 -08:00
dma.h [PATCH] CRIS update: pci 2005-07-27 16:26:00 -07:00
elf.h Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
eshlibld.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ethernet.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
etraxgpio.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
etraxi2c.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fasttimer.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
futex.h [PATCH] consolidate asm/futex.h 2006-01-08 20:13:39 -08:00
hardirq.h [PATCH] CRIS update: IRQ 2005-07-27 16:26:00 -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] CRIS update: drivers 2005-07-27 16:25:59 -07:00
io.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ipc.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
kmap_types.h [PATCH] CRIS update: updates for 2.6.12 2005-07-27 16:26:01 -07:00
linkage.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
local.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 [PATCH] CRIS update: SMP 2005-07-27 16:26:01 -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 Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
param.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
percpu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgalloc.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
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 Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
processor.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ptrace.h [PATCH] CRIS update: profiler 2005-07-27 16:26:00 -07:00
resource.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rs485.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rtc.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
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] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
sembuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
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: CRIS: Use the new IRQF_ constants 2006-07-02 13:58:46 -07:00
smp.h [PATCH] CRIS update: SMP 2005-07-27 16:26:01 -07:00
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] CRIS update: SMP 2005-07-27 16:26:01 -07:00
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
sync_serial.h [PATCH] CRIS update: synchronous serial port driver 2005-07-27 16:26:01 -07:00
system.h [PATCH] remove set_wmb - arch removal 2006-07-14 21:56:14 -07:00
termbits.h [PATCH] CRIS update: synchronous serial port driver 2005-07-27 16:26:01 -07:00
termios.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
thread_info.h [PATCH] death of get_thread_info/put_thread_info 2006-01-12 09:08:59 -08:00
timex.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
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
types.h [PATCH] sab: consolidate kmem_bufctl_t 2005-09-05 00:05:48 -07:00
uaccess.h [PATCH] cris: "extern inline" -> "static inline" 2005-11-07 07:53:30 -08:00
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 Clean up exported headers on CRIS 2006-09-21 09:33:55 +01:00
user.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00