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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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