arm64: lib: patch in prfm for copy_page if requested
authorAndrew Pinski <apinski@cavium.com>
Tue, 2 Feb 2016 12:46:26 +0000 (12:46 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Tue, 16 Feb 2016 15:12:33 +0000 (15:12 +0000)
commit60e0a09db24adc8809696307e5d97cc4ba7cb3e0
tree63393658bd17f4f604a19f9242d1f09027bfbe15
parent223e23e8aa26b0bb62c597637e77295e14f6a62c
arm64: lib: patch in prfm for copy_page if requested

On ThunderX T88 pass 1 and pass 2, there is no hardware prefetching so
we need to patch in explicit software prefetching instructions

Prefetching improves this code by 60% over the original code and 2x
over the code without prefetching for the affected hardware using the
benchmark code at https://github.com/apinski-cavium/copy_page_benchmark

Signed-off-by: Andrew Pinski <apinski@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Tested-by: Andrew Pinski <apinski@cavium.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/lib/copy_page.S