linux-kernel - [PATCH v2 0/2] Reduce IPI calls for remote msr access

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Message-Id: <1452647483-14244-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date:	Tue, 12 Jan 2016 17:11:21 -0800
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Linux PM <linux-pm@...r.kernel.org>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	X86 Kernel <x86@...nel.org>
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v2 0/2] Reduce IPI calls for remote msr access

IPI calls to access MSRs on remote CPUs are expensive. So add a lib call
for read/modify/write access and use it in Intel RAPL driver.

Changes since v1:
	(based on feedback from Thomas Gleixner)
	- remove duplicated !CONFIG_SMP code
	- rename variables
	- added a check for local CPU before searching for active CPU oni
	  the package

Jacob Pan (2):
  x86/msr: add on cpu read/modify/write function
  powercap/rapl: reduce ipi calls

 arch/x86/include/asm/msr.h    | 13 ++++++++
 arch/x86/lib/msr-smp.c        | 34 +++++++++++++++++++
 arch/x86/lib/msr.c            | 18 ++++++++++
 drivers/powercap/intel_rapl.c | 77 +++++++++++++++++++++++--------------------
 4 files changed, 107 insertions(+), 35 deletions(-)

-- 
1.9.1