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Olof Johansson e63f8f439d [PATCH] ppc64: no prefetch for NULL pointers 
For prefetches of NULL (as when walking a short linked list), PPC64 will in
some cases take a performance hit.  The hardware needs to do the TLB walk,
and said walk will always miss, which means (up to) two L2 misses as
penalty.  This seems to hurt overall performance, so for NULL pointers skip
the prefetch alltogether.

Signed-off-by: Olof Johansson <olof@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-16 15:24:38 -07:00
..
acpi Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-alpha Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-arm [PATCH] arm: add comment about dma_supported() 2005-04-16 15:23:57 -07:00
asm-arm26 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-cris Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-frv Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-generic Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-h8300 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-i386 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-ia64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-m32r Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-m68k [PATCH] ppc32: fix compilation error in include/asm-m68k/setup.h 2005-04-16 15:24:27 -07:00
asm-m68knommu Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-mips Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-parisc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-ppc [PATCH] ppc64: very basic desktop g5 sound support 2005-04-16 15:24:32 -07:00
asm-ppc64 [PATCH] ppc64: no prefetch for NULL pointers 2005-04-16 15:24:38 -07:00
asm-s390 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-sh64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-sparc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-sparc64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-um Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-v850 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
asm-x86_64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
linux [PATCH] Fix linux/atalk.h header 2005-04-16 15:24:09 -07:00
math-emu Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
media Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mtd Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
net Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pcmcia Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rxrpc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
scsi Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sound Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
video Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00