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ef6edc9746
linux-kernel-test/include/asm-s390
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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
appldata.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
atomic.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
auxvec.h
bitops.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
bug.h [S390] __builtin_trap() and gcc version. 2006-07-12 16:39:42 +02:00
bugs.h
byteorder.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
cache.h [PATCH] s390: add read_mostly optimization 2006-04-28 08:33:48 -07:00
cacheflush.h
ccwdev.h [S390] Fix sparse warnings. 2006-07-12 16:41:55 +02:00
ccwgroup.h
checksum.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
cio.h [S390] ipl/dump on panic. 2006-09-20 15:58:49 +02:00
cmb.h [S390] rework of channel measurement facility. 2006-06-29 15:08:41 +02:00
compat.h [PATCH] s390: add ptr_to_compat() 2006-03-27 08:44:48 -08:00
cpcmd.h
cputime.h
current.h
dasd.h [S390] add PAV support to the dasd driver. 2006-06-29 15:08:18 +02:00
debug.h [PATCH] Fix 'make headers_check' on s390 2006-09-16 12:54:31 -07:00
delay.h
div64.h [S390] __div64_32 for 31 bit. 2006-09-28 16:55:39 +02:00
dma-mapping.h
dma.h [S390] empty function defines. 2006-09-20 15:58:51 +02:00
ebcdic.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
elf.h [PATCH] Fix 'make headers_check' on s390 2006-09-16 12:54:31 -07:00
emergency-restart.h
errno.h
extmem.h
fcntl.h
futex.h [S390] Make user-copy operations run-time configurable. 2006-09-20 15:59:42 +02:00
hardirq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
idals.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
io.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h
ipc.h
ipcbuf.h
irq.h [PATCH] Make touch_nmi_watchdog imply touch_softlockup_watchdog on all archs 2006-09-29 09:18:05 -07:00
irqflags.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
Kbuild [S390] Unexport <asm/z90crypt.h>, export <asm/zcrypt.h> in its place. 2006-09-24 22:07:25 +01:00
kdebug.h [S390] add kprobes support. 2006-09-20 15:58:39 +02:00
kexec.h [PATCH] Kdump: powerpc and s390 build failure fix 2006-01-10 08:01:27 -08:00
kmap_types.h
kprobes.h [S390] add kprobes support. 2006-09-20 15:58:39 +02:00
linkage.h
local.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
lowcore.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
mathemu.h
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu_context.h [PATCH] s390: "extern inline" -> "static inline" 2005-11-09 07:55:52 -08:00
mmu.h
module.h
monwriter.h [S390] Linux API for writing z/VM APPLDATA Monitor records. 2006-09-20 15:59:34 +02:00
msgbuf.h
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h
page.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
param.h
pci.h
percpu.h [PATCH] trigger a syntax error if percpu macros are incorrectly used 2006-09-26 08:48:44 -07:00
pgalloc.h [S390] Cleanup in page table related code. 2006-09-20 15:59:37 +02:00
pgtable.h [PATCH] convert s390 page handling macros to functions 2006-09-29 09:18:03 -07:00
poll.h [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications 2006-03-25 08:22:56 -08:00
posix_types.h [S390] __FD_foo definitions. 2006-06-14 14:10:51 +01:00
processor.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
ptrace.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
qdio.h [PATCH] s390: Remove CVS generated information 2006-02-01 08:53:23 -08:00
qeth.h
resource.h
rwsem.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
s390_ext.h
s390_rdev.h [PATCH] s390: email-address change 2006-01-14 18:27:10 -08:00
scatterlist.h
sections.h
segment.h
semaphore.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
sembuf.h
setup.h [S390] Use alternative user-copy operations for new hardware. 2006-09-20 15:59:44 +02:00
sfp-machine.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
shmbuf.h
shmparam.h
sigcontext.h [PATCH] s390: sigcontext.h vs __user 2006-01-14 18:27:08 -08:00
siginfo.h
signal.h [PATCH] irq-flags: S390: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
sigp.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
smp.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
socket.h [AF_UNIX]: Datagram getpeersec 2006-06-29 16:58:06 -07:00
sockios.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
stat.h
statfs.h
string.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
suspend.h
system.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
tape390.h
termbits.h
termios.h
thread_info.h [S390] preempt_count initialization. 2006-06-29 15:02:47 +02:00
timer.h [PATCH] s390: timer interface visibility 2006-02-03 08:32:01 -08:00
timex.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
tlb.h
tlbflush.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
todclk.h
topology.h
types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
uaccess.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
ucontext.h
unaligned.h
unistd.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
user.h
vtoc.h Use __uXX types for S390 DASD volume label definitions which are user-visible 2006-05-04 01:18:33 +01:00
xor.h
zcrypt.h [S390] zcrypt secure key cryptography extension. 2006-09-20 15:58:36 +02:00