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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
..
bigsur [PATCH] Serial: Split 8250 port table (part 2) 2005-06-29 18:45:19 +01:00
cpu-sh2 sh: Fixup SHMLBA definition for SH7705. 2006-09-27 15:29:18 +09:00
cpu-sh3 sh: Calculate shm alignment at runtime. 2006-09-27 18:36:17 +09:00
cpu-sh4 sh: Calculate shm alignment at runtime. 2006-09-27 18:36:17 +09:00
dreamcast Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ec3104 [PATCH] Serial: Split 8250 port table (part 2) 2005-06-29 18:45:19 +01:00
edosk7705 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hd64465 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
hp6xx sh: APM/PM support. 2006-09-27 16:20:22 +09:00
hs7751rvoip sh: Add support for R7780RP and R7780MP boards. 2006-09-27 15:59:17 +09:00
landisk sh: Add support for R7780RP and R7780MP boards. 2006-09-27 15:59:17 +09:00
mpc1211 [PATCH] irq-flags: SH: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
r7780rp sh: Add support for R7780RP and R7780MP boards. 2006-09-27 15:59:17 +09:00
rts7751r2d sh: Move voyagergx_reg.h to a more sensible place. 2006-09-27 17:17:27 +09:00
saturn Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sh03 sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
shmin sh: SHMIN board support. 2006-09-27 17:41:31 +09:00
a.out.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
adc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
addrspace.h sh: __addr_ok() and other misc nommu fixups. 2006-09-27 17:25:07 +09:00
apm.h sh: APM/PM support. 2006-09-27 16:20:22 +09:00
atomic.h sh: New atomic ops for SH-4A movli.l/movco.l 2006-09-27 17:52:19 +09:00
auxvec.h sh: Initial vsyscall page support. 2006-09-27 18:33:49 +09:00
bitops.h sh: Various cosmetic cleanups. 2006-09-27 12:31:01 +09:00
bug.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
bugs.h sh: Support for SH7770/SH7780 CPU subtypes. 2006-09-27 14:31:40 +09:00
byteorder.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.h sh: page table alloc cleanups and page fault optimizations. 2006-09-27 15:13:36 +09:00
cacheflush.h sh: Calculate shm alignment at runtime. 2006-09-27 18:36:17 +09:00
checksum.h sh: Various cosmetic cleanups. 2006-09-27 12:31:01 +09:00
clock.h [PATCH] sh: Simplistic clock framework 2006-01-16 23:15:28 -08:00
cpu-features.h sh: Support for L2 cache on newer SH-4A CPUs. 2006-09-27 18:27:43 +09:00
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 sh: dma-mapping compile fixes. 2006-09-27 18:34:41 +09:00
dma.h sh: More cosmetic cleanups and trivial fixes. 2006-09-27 17:03:56 +09:00
elf.h sh: Initial vsyscall page support. 2006-09-27 18:33:49 +09:00
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
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fixmap.h sh: Various cosmetic cleanups. 2006-09-27 12:31:01 +09:00
flat.h sh: Various nommu fixes. 2006-09-27 17:21:02 +09:00
floppy.h [PATCH] irq-flags: SH: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
freq.h [PATCH] sh: Simplistic clock framework 2006-01-16 23:15:28 -08:00
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
hd64461.h sh: APM/PM support. 2006-09-27 16:20:22 +09:00
hw_irq.h [PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend() 2006-06-29 10:26:23 -07:00
ide.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
io_generic.h [PATCH] sh: I/O routine cleanups and ioremap() overhaul 2006-01-16 23:15:28 -08:00
io.h sh: Optimized readsl()/writesl() support. 2006-09-27 18:25:24 +09:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h [PATCH] sh/sh64: Fix bogus TIOCGICOUNT definitions 2006-02-01 08:53:20 -08:00
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-sh7343.h sh: Add support for SH7706/SH7710/SH7343 CPUs. 2006-09-27 17:38:11 +09:00
irq-sh7780.h sh: Add support for R7780RP and R7780MP boards. 2006-09-27 15:59:17 +09:00
irq-sh73180.h sh: Add support for SH7706/SH7710/SH7343 CPUs. 2006-09-27 17:38:11 +09:00
irq.h sh: Add support for 4K stacks. 2006-09-27 18:22:14 +09:00
Kbuild Add empty Kbuild files for 'make headers_install' in remaining arches. 2006-06-18 12:58:53 +01:00
kexec.h sh: Update kexec support for API changes. 2006-09-27 18:26:05 +09:00
keyboard.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
kgdb.h sh: kgdb stub cleanups. 2006-09-27 16:24:55 +09:00
kmap_types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
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
machvec_init.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
machvec.h sh: machvec rework. 2006-09-27 18:17:31 +09:00
mc146818rtc.h sh: Kill off the rest of the legacy rtc mess. 2006-09-27 17:45:01 +09:00
microdev.h [PATCH] sh: SH4-202 microdev updates 2006-02-01 08:53:19 -08:00
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu_context.h sh: Initial vsyscall page support. 2006-09-27 18:33:49 +09:00
mmu.h sh: Initial vsyscall page support. 2006-09-27 18:33:49 +09:00
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 sh: Calculate shm alignment at runtime. 2006-09-27 18:36:17 +09:00
param.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci.h sh: Consolidated SH7751/SH7780 PCI support. 2006-09-27 16:43:28 +09:00
percpu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgalloc.h sh: page table alloc cleanups and page fault optimizations. 2006-09-27 15:13:36 +09:00
pgtable-2level.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable.h sh: Calculate shm alignment at runtime. 2006-09-27 18:36:17 +09:00
pm.h sh: APM/PM support. 2006-09-27 16:20:22 +09:00
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 sh: Initial vsyscall page support. 2006-09-27 18:33:49 +09:00
ptrace.h Fix 'make headers_check' on sh 2006-09-21 08:36:50 +01:00
resource.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rtc.h sh: Kill off the rest of the legacy rtc mess. 2006-09-27 17:45:01 +09:00
rwsem.h [PATCH] lockdep: remove RWSEM_DEBUG remnants 2006-07-03 15:27:01 -07:00
scatterlist.h sh: Fix libata build. 2006-09-27 14:48:09 +09:00
sci.h serial: Add SERIAL_SH_SCI_NR_UARTS for sh-sci. 2006-09-27 17:32:30 +09:00
se7300.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
se7343.h sh: Solution Engine SH7343 board support. 2006-09-27 18:09:34 +09:00
se7751.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
se73180.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
se.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
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 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
setup.h sh: earlyprintk= support and cleanups. 2006-09-27 14:26:53 +09:00
sfp-machine.h sh: math-emu support 2006-09-27 17:15:32 +09:00
sh_bios.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 sh: Fixup SHMLBA definition for SH7705. 2006-09-27 15:29:18 +09:00
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: SH: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
smc37c93x.h sh: Move smc37c93x.h for SystemH board use. 2006-09-27 11:16:20 +09:00
smp.h sh: remove cpu_online() definition from <asm/smp.h> 2006-09-27 14:32:57 +09:00
snapgear.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
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_types.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock.h [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
stat.h [PATCH] 2TB files: st_blocks is invalid when calling stat64 2006-03-26 08:57:00 -08:00
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
system.h sh: More cosmetic cleanups and trivial fixes. 2006-09-27 17:03:56 +09:00
systemh7751.h sh: Board updates for I/O routine rework. 2006-09-27 15:41:24 +09:00
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 sh: Add support for 4K stacks. 2006-09-27 18:22:14 +09:00
timer.h sh: APM/PM support. 2006-09-27 16:20:22 +09:00
timex.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
titan.h sh: Titan board support. 2006-09-27 15:05:39 +09:00
tlb.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tlbflush.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
topology.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
uaccess.h sh: __addr_ok() and other misc nommu fixups. 2006-09-27 17:25:07 +09:00
ubc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
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 Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6 2006-09-27 08:49:07 -07:00
user.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
voyagergx.h sh: Move voyagergx_reg.h to a more sensible place. 2006-09-27 17:17:27 +09:00
watchdog.h sh: Various cosmetic cleanups. 2006-09-27 12:31:01 +09:00
xor.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00