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authorPeter Crosthwaite <peter.crosthwaite@xilinx.com>2015-03-02 19:19:14 +0000
committerWill Deacon <will.deacon@arm.com>2015-03-17 10:17:29 +0000
commit1baa82f48030f38d1895301f1ec93acbcb3d15db (patch)
tree7d9e69cd915039f5fd62036351a4d78ad955b89c /tools/perf/scripts/python/call-graph-from-postgresql.py
parentLinux 4.0-rc4 (diff)
downloadlinux-dev-1baa82f48030f38d1895301f1ec93acbcb3d15db.tar.xz
linux-dev-1baa82f48030f38d1895301f1ec93acbcb3d15db.zip
arm64: Implement cpu_relax as yield
ARM64 has the yield nop hint which has the intended semantics of cpu_relax. Implement. The immediate application is ARM CPU emulators. An emulator can take advantage of the yield hint to de-prioritise an emulated CPU in favor of other emulation tasks. QEMU A64 SMP emulation has yield awareness, and sees a significant boot time performance increase with this change. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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