linux-kernel - [RFC PATCH 3/4] x86, mwaitt: add document to describe mwaitx

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Date:	Tue, 19 May 2015 16:01:11 +0800
From:	Huang Rui <ray.huang@....com>
To:	Borislav Petkov <bp@...e.de>, Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>,
	Huang Rui <ray.huang@....com>
Subject: [RFC PATCH 3/4] x86, mwaitt: add document to describe mwaitx

This patch adds a description in the kernel parameters documentation for
"idle=mwaitx".

Signed-off-by: Huang Rui <ray.huang@....com>
---
 Documentation/kernel-parameters.txt | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 61ab162..af88c5c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1363,7 +1363,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			Claim all unknown PCI IDE storage controllers.
 
 	idle=		[X86]
-			Format: idle=poll, idle=halt, idle=nomwait
+			Format: idle=poll, idle=halt, idle=nomwait,
+				idle=mwaitx[,<timer value>]
 			Poll forces a polling idle loop that can slightly
 			improve the performance of waking up a idle CPU, but
 			will use a lot of power and make the system run hot.
@@ -1371,6 +1372,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			idle=halt: Halt is forced to be used for CPU idle.
 			In such case C2/C3 won't be used again.
 			idle=nomwait: Disable mwait for CPU C-states
+			idle=mwaitx[,<timer value>]: Enable mwaitx and
+			configure max waiting timeout value (usec) for CPU
+			idle. If <timer value> is not specified, the
+			maximum timeout value (ebx=0xffffffff * TSC cycle)
+			will be used.  If <timer value> is specified as
+			zero, the timer is disabled. Waiting exits via
+			other reasons, such as an IPI.
 
 	ignore_loglevel	[KNL]
 			Ignore loglevel setting - this will print /all/
-- 
2.1.0

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