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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>		19 years ago
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hwregs	[PATCH] CRIS update: new subarchitecture v32	20 years ago
Kbuild	Clean up exported headers on CRIS	19 years ago
arbiter.h	typo fixes: bandwith -> bandwidth	19 years ago
atomic.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
bitops.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
byteorder.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	19 years ago
checksum.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
cryptocop.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
delay.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
dma.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
elf.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
ide.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
intmem.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
io.h	Don't include linux/config.h from anywhere else in include/	19 years ago
irq.h	[PATCH] irq-flags: CRIS: Use the new IRQF_ constants	19 years ago
juliette.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
memmap.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
mmu.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
offset.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
page.h	Don't include linux/config.h from anywhere else in include/	19 years ago
pgtable.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
pinmux.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
processor.h	Don't include linux/config.h from anywhere else in include/	19 years ago
ptrace.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	19 years ago
system.h	Don't include linux/config.h from anywhere else in include/	19 years ago
thread_info.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
timex.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
tlb.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
uaccess.h	[PATCH] cris: "extern inline" -> "static inline"	19 years ago
unistd.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago
user.h	[PATCH] CRIS update: new subarchitecture v32	20 years ago