linux-kernel - [PATCH 0/2] sparc64: Use low latency path to resume idle cpu

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Date:   Sat,  8 Jul 2017 14:23:42 -0600
From:   Vijay Kumar <vijay.ac.kumar@...cle.com>
To:     davem@...emloft.net, sparclinux@...r.kernel.org
Cc:     rob.gardner@...cle.com, anthony.yznaga@...cle.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] sparc64: Use low latency path to resume idle cpu

cpu_poke is a low latency path to resume the target cpu if suspended
using cpu_yield. Use cpu poke to resume cpu if supported by hypervisor.

	     hackbench results (lower is better):
Number of		
Process:		w/o fix		with fix
1  			0.012		 0.010
10			0.021		 0.019
100			0.151		 0.148

Vijay Kumar (2):
  sparc64: Add a new hypercall CPU_POKE
  sparc64: Use cpu_poke to resume idle cpu

 arch/sparc/include/asm/hypervisor.h |   17 ++++++++
 arch/sparc/include/asm/smp_64.h     |    5 ++
 arch/sparc/kernel/hvapi.c           |    9 ++++
 arch/sparc/kernel/hvcalls.S         |   11 +++++
 arch/sparc/kernel/process_64.c      |    7 +++-
 arch/sparc/kernel/setup_64.c        |    1 +
 arch/sparc/kernel/smp_64.c          |   75 +++++++++++++++++++++++++++++++++-
 7 files changed, 121 insertions(+), 4 deletions(-)
--