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
..
sn	[IA64] remove redundant local_irq_save() calls from sn_sal.h	2006-08-29 10:17:21 -07:00
a.out.h
acpi-ext.h	[IA64] update HP CSR space discovery via ACPI	2006-04-06 14:42:38 -07:00
acpi.h	[IA64] - Fix MAX_PXM_DOMAINS for systems with > 256 nodes	2006-04-20 10:16:11 -07:00
agp.h
asmmacro.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
atomic.h	[PATCH] atomic: add_unless cmpxchg optimise	2006-03-23 07:38:17 -08:00
auxvec.h
bitops.h	[IA64] remove asm-ia64/bitops.h self-inclusion	2006-05-05 11:37:15 -07:00
break.h
bug.h	[PATCH] remove gcc-2 checks	2006-01-08 20:14:02 -08:00
bugs.h
byteorder.h
cache.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
cacheflush.h
checksum.h
compat.h	[PATCH] ia64: add ptr_to_compat()	2006-03-27 08:44:48 -08:00
cpu.h
cputime.h
current.h
cyclone.h
delay.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
div64.h
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
dmi.h	[PATCH] ia64: use i386 dmi_scan.c	2006-03-26 08:56:54 -08:00
elf.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
emergency-restart.h
errno.h
esi.h	[IA64] esi-support	2006-06-21 11:19:22 -07:00
fcntl.h
fpswa.h
fpu.h
futex.h	[IA64] Implement futex primitives	2006-09-26 14:00:56 -07:00
gcc_intrin.h
hardirq.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
hw_irq.h	[PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend()	2006-06-29 10:26:23 -07:00
ia32.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
ia64regs.h
ide.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
intel_intrin.h	[IA64] use icc defined constant	2006-02-07 08:49:27 -08:00
intrinsics.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
io.h	[PATCH] make valid_mmap_phys_addr_range() take a pfn	2006-07-10 13:24:25 -07:00
ioctl.h	[PATCH] Generic ioctl.h	2006-01-10 08:01:34 -08:00
ioctls.h
iosapic.h
ipcbuf.h
irq.h	[PATCH] genirq ia64 cleanup	2006-07-03 15:26:58 -07:00
Kbuild	[HEADERS] One line per header in Kbuild files to reduce conflicts	2006-09-19 12:43:58 +01:00
kdebug.h	[PATCH] Notify page fault call chain for ia64	2006-06-26 09:58:22 -07:00
kmap_types.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
kprobes.h	[IA64] kprobe opcode 16 bytes alignment on IA64	2006-09-26 11:20:37 -07:00
kregs.h
linkage.h	[PATCH] abstract type/size specification for assembly	2006-03-24 07:33:25 -08:00
local.h
machvec.h	[PATCH] PCI: msi abstractions and support for altix	2006-06-21 11:59:58 -07:00
machvec_dig.h	[IA64] cleanup dig_irq_init	2006-03-24 13:12:46 -08:00
machvec_hpsim.h
machvec_hpzx1.h
machvec_hpzx1_swiotlb.h
machvec_init.h
machvec_sn2.h	[PATCH] PCI: msi abstractions and support for altix	2006-06-21 11:59:58 -07:00
mc146818rtc.h
mca.h	[IA64] Sanitize assembler code for ia64_sal_os_state	2006-06-21 14:44:26 -07:00
mca_asm.h	[IA64] Make gp value point to Region 5 in mca handler	2006-09-26 14:13:03 -07:00
meminit.h	[PATCH] Have ia64 use add_active_range() and free_area_init_nodes	2006-09-27 08:26:11 -07:00
mman.h	[PATCH] IA64,sparc: local DoS with corrupted ELFs	2006-09-08 08:40:46 -07:00
mmu.h
mmu_context.h
mmzone.h
module.h	[PATCH] Move compiler check for modules to ia64 only	2006-09-26 10:52:37 +02:00
msgbuf.h
msi.h	[PATCH] PCI: msi abstractions and support for altix	2006-06-21 11:59:58 -07:00
mutex.h	[IA64] fix bug in ia64 __mutex_fastpath_trylock	2006-04-07 22:39:49 -07:00
namei.h
nodedata.h	[PATCH] pgdat allocation and update for ia64 of memory hotplug: update pgdat address array	2006-06-27 17:32:37 -07:00
numa.h	[PATCH] fix "cpu to node relationship fixup: map cpu to node"	2006-09-27 08:26:08 -07:00
page.h	[PATCH] Fix 'make headers_check' on ia64	2006-09-16 12:54:32 -07:00
pal.h	[IA64] PAL calls need physical mode, stacked	2006-09-26 15:21:11 -07:00
param.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
parport.h
patch.h
pci.h
percpu.h	[PATCH] lockdep: add per_cpu_offset()	2006-07-03 15:27:00 -07:00
perfmon.h
perfmon_default_smpl.h
pgalloc.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
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
processor.h	[IA64] Move perfmon tables from thread_struct to pfm_context	2006-09-26 12:03:13 -07:00
ptrace.h	[PATCH] Fix 'make headers_check' on ia64	2006-09-16 12:54:32 -07:00
ptrace_offsets.h
resource.h
rse.h
rwsem.h	[PATCH] lockdep: remove RWSEM_DEBUG remnants	2006-07-03 15:27:01 -07:00
sal.h	[IA64] avoid broken SAL_CACHE_FLUSH implementations	2006-02-02 13:25:54 -08:00
scatterlist.h
sections.h
segment.h
semaphore.h	[IA64] Fix bug in ia64 specific down() function	2006-01-17 14:04:00 -08:00
sembuf.h
serial.h
setup.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	[PATCH] irq-flags: IA64: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
smp.h	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6	2006-09-27 10:53:30 -07:00
socket.h	[AF_UNIX]: Datagram getpeersec	2006-06-29 16:58:06 -07:00
sockios.h
sparsemem.h
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	2006-10-01 00:39:21 -07:00
spinlock_types.h
stat.h
statfs.h
string.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
suspend.h
system.h	[IA64] sparse cleanups	2006-08-02 16:03:44 -07:00
termbits.h
termios.h
thread_info.h	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	2006-07-03 15:27:11 -07:00
timex.h	[IA64] ia64: simplify and fix udelay()	2006-02-15 13:37:04 -08:00
tlb.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
tlbflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
topology.h	[PATCH] sched: mc/smt power savings sched policy	2006-06-27 17:32:45 -07:00
types.h
uaccess.h
ucontext.h
unaligned.h
uncached.h
unistd.h	Revert "[IA64] Unwire set/get_robust_list"	2006-09-26 14:04:42 -07:00
unwind.h
user.h
ustack.h	[PATCH] Fix 'make headers_check' on ia64	2006-09-16 12:54:32 -07:00
vga.h	[PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use	2006-06-22 15:05:58 -07:00
xor.h