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android_kernel_motorola_sm6225/include/asm-parisc
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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
..
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